[Due to the increasing size of the archives, each topic page now contains only the prior 365 days of content. Access to older stories is now solely through the Monthly Archive pages or the site search function.]
LG Chem and Eguana partner on Li-ion residential energy storage system for North America
April 23, 2015
Eguana Technologies, a supplier of power control and conversion solutions for distributed energy storage systems and Li-ion manufacturer LG Chem have combined their technologies under a multi-year agreement to deliver a certified, fully integrated energy storage system (ESS) Eguana calls “AC Battery”. The modular system is targeted as a residential product, but also has the potential to be aggregated for small commercial and industrial (C&I) end-users.
Basic product capacity is 6.4 kWh. Eguana designed the package around LG Chem’s battery modules and supplies its Bi-Direx inverter and controls subassembly. The low voltage design enables high-capacity batteries to operate in lower power ratings needed for decentralized systems (i.e. residential rooftop solar). Eguana has also worked with Germany-based Sonnenbatterie on a similar ESS solution.
Research facility in Dresden produces first batch of Audi e-diesel; sunfire’s power-to-liquid technology
April 21, 2015
A pilot plant in Dresden has started production of the synthetic fuel Audi e-diesel using water, CO2 and green power—i.e., power-to-liquid (PtL). After a commissioning phase of just four months, the research facility in Dresden started producing its first batches of high‑quality diesel fuel a few days ago. (Earlier post.)
The energy technology company sunfire is Audi’s project partner and the plant operator. The CO2 used is currently supplied by a biogas facility. In addition, initially a portion of the CO2 needed is extracted from the ambient air by means of direct air capturing, a technology of Audi’s Zurich‑based partner Climeworks.
University of Adelaide team exploring novel configuration for solar hybridized coal-to-liquids process
April 13, 2015
|Simplified flowsheet of the proposed solar hybridized coal- to-liquids (SCTL) process with the proposed solar hybridized dual fluidized bed (SDFB) gasifier. Credit: ACS, Guo et al. Click to enlarge.|
Researchers at the University of Adelaide (Australia) are proposing a novel configuration of a hybridized concentrated solar thermal (CST) dual fluidized bed (DFB) gasification process for Fischer–Tropsch liquids (FTL) fuels production. In their investigation of the process, reported in a paper in the ACS journal Energy & Fuels, they used lignite as the feedstock (Solar hybridized coal to liquids, SCTL), although the process could also be used with biomass.
Although fuel products produced via the Fischer-Tropsch process are high quality (free of sulfur, nitrogen and other contaminants found in petroleum-derived products), and coal is a plentiful and low-cost feedstock, the very high greenhouse gas emissions from coal-to-liquids production processes are a major barrier. As one approach to reducing the overall carbon intensity of FT fuels, there is growing interest in introducing concentrated solar power as a heat source into the gasification process.
UC Berkeley hybrid semiconductor nanowire-bacteria system for direct solar-powered production of chemicals from CO2 and water
April 10, 2015
Researchers at UC Berkeley have developed an artificial photosynthetic scheme for the direct solar-powered production of value-added chemicals from CO2 and water using a two-step process involving a biocompatible light-capturing nanowire array with a direct interface with microbial systems.
As a proof of principle, they demonstrated that, using only solar energy input, such a hybrid semiconductor nanowire–bacteria system can reduce CO2 at neutral pH to a wide array of chemical targets, such as fuels, polymers, and complex pharmaceutical precursors A paper on their work is published in the ACS journal Nano Letters.
Global investment in renewable power reached $270.2B in 2014, ~17% up from 2013; biofuel investment fell 8% to 10-year low
April 06, 2015
Global investment in renewable power and fuels (excluding large hydro-electric projects) was $270.2 billion in 2014, nearly 17% higher than the previous year, according to the latest edition of an annual report commissioned by the United Nations Environment Program’s (UNEP) Division of Technology, Industry and Economic (DTIE) in cooperation with Frankfurt School-UNEP Collaborating Centre for Climate & Sustainable Energy Finance and produced in collaboration with Bloomberg New Energy Finance.
This marked the first annual increase in dollar commitments to renewables—excluding large hydro—for three years, and brought the total up to just 3% below the all-time record of $278.8 billion set in 2011. The increase reflected several influences, according to the report, including a boom in solar installations in China and Japan—totalling $74.9 billion between those two countries—and a record $18.6 billion of final investment decisions on offshore wind projects in Europe.
BASF and Floatility partner on ultra-lightweight solar-powered electric scooter: 12kg e-floater
March 26, 2015
BASF and Floatility have partnered for the development of an ultra-lightweight and solar-powered electric scooter. Weighing less than 12 kilograms (26.5 lbs) and consisting of more than 80% composite and plastic materials from BASF, the scooter will give commuters the sensation of floating and thus has been named ‘e-floater’. The e-floater is designed to bridge the gap on the last mile between home or city center and the nearest public transport.
BASF will provide versatile plastic materials and support the project with its extensive development capabilities. Molding multiple parts to create complex shapes with plastic materials enables design freedom and the streamlined construction of the ‘e-floater’.
UW-Madison team develops novel hydrogen-producing photoelectrochemical cell using solar-driven biomass conversion as anode reaction
March 11, 2015
Researchers at the University of Wisconsin-Madison have developed an innovative hydrogen-producing photoelectrochemical cell (PEC), using solar-driven biomass conversion as the anode reaction. In a paper in the journal Nature Chemistry, the duo reports obtaining a near-quantitative yield and 100% Faradaic efficiency at ambient conditions without the use of precious-metal catalysts for this reaction, which is also thermodynamically and kinetically more favorable than conventional water oxidation at the anode. They thus demonstrated the utility of solar energy for biomass conversion (rather than catalysts) as well as the feasibility of using an oxidative biomass conversion reaction as an anode reaction in a hydrogen-forming PEC.
Chemistry Professor Kyoung-Shin Choi and postdoc Hyun Gil Cha said that their results suggest that solar-driven biomass conversion can be a viable anode reaction that has the potential to increase both the efficiency and the utility of PECs constructed for solar-fuel production.
Harvard hybrid “bionic leaf” converts solar energy to liquid fuel isopropanol
February 10, 2015
Scientists from a team spanning Harvard University’s Faculty of Arts and Sciences, Harvard Medical School and the Wyss Institute for Biologically Inspired Engineering at Harvard University have developed a scalable, integrated bioelectrochemical system that uses bacteria to convert solar energy into a liquid fuel. Their work integrates water-splitting catalysts comprising earth-abundant components with wild-type and engineered Ralstonia eutropha bacteria to generate biomass and isopropyl alcohol. An open access paper describing their work is published in Proceedings of the National Academy of Sciences (PNAS).
Pamela Silver, the Elliott T. and Onie H. Adams Professor of Biochemistry and Systems Biology at HMS and an author of the paper, calls the system a bionic leaf, a nod to the solar water-splitting artificial leaf invented by the paper’s senior author, Daniel Nocera, the Patterson Rockwood Professor of Energy at Harvard University. (Earlier post.)
HZB researchers characterize efficient manganese catalyst for artificial photosynthesis
January 22, 2015
Scientists at the Helmholtz Center for Materials and Energy (HZB) in collaboration with the School of Chemistry and ARC Centre of Excellence for Electromaterials Science at Monash University, Australia, have precisely characterized the electronic states of a manganese (Mn) water-splitting catalyst for artificial photosynthesis.
The team led by Professor Emad Aziz, head of the HZB Institute “Methods for Material Development“ and Professor Leone Spiccia from Monash University investigated the changes in the local electronic structure of the Mn 3d orbitals of a Mn catalyst derived from a dinuclear MnIII complex during the water oxidation cycle using X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) analyses.
IRENA report finds renewable power costs at parity or below fossil fuels in many parts of world
January 17, 2015
The cost of generating power from renewable energy sources has reached parity or dropped below the cost of fossil fuels for many technologies in many parts of the world, according to a new report released by the International Renewable Energy Agency (IRENA).
The report, “Renewable Power Generation Costs in 2014”, concludes that biomass, hydropower, geothermal and onshore wind are all competitive with or cheaper than coal, oil and gas-fired power stations, even without financial support and despite falling oil prices. Solar photovoltaic (PV) is leading the cost decline, with solar PV module costs falling 75% since the end of 2009 and the cost of electricity from utility-scale solar PV falling 50% since 2010.
Caltech team proposes taxonomy for solar fuels generators; different approaches to converting sunlight to chemical fuels
December 22, 2014
Researchers at the California Institute of Technology are proposing a nomenclature and taxonomy for solar fuels generators—devices that harness energy from sunlight to drive the synthesis of chemical fuels. A number of different approaches to this technology are being pursued, many of which can be differentiated by the physical principles on which they are based, according to the Caltech team, led by Dr. Nathan Lewis.
In an open-access paper published in the RSC journal Energy & Environmental Science, Dr. Lewis and colleagues outlined their method of using the source of the asymmetry that separates photogenerated electronics and holes as the basis for their taxonomy. They identify three basic device types: photovoltaic cells, photoelectrochemical cells, and photoelectrosynthetic particulate/molecular photocatalysts.
California makes first investments in $100M energy research & development program; also biogas and H2
December 11, 2014
The California Energy Commission approved its first $10 million to fund Electric Program Investment Charge (EPIC) research and development (R&D) projects during its monthly business meeting today. The Commission also approved grants for the operation of a hydrogen fueling station, biofuel production, geothermal exploration and rooftop solar for schools.
EPIC is a multi-year, research investment program focused on electricity-related innovations, finding new energy solutions and bringing clean energy ideas to the marketplace. The program’s 2012-2014 plan calls for investing $330 million between 2014 and 2015 in innovative technologies that provide benefits to electric ratepayers served by Pacific Gas and Electric Co., Southern California Edison, and San Diego Gas & Electric Co. The seven awards approved will fund applied R&D projects that will develop utility-scale renewable energy generation technologies.
New efficient catalytic system for the photocatalytic reduction of CO2 to hydrocarbons
December 04, 2014
|Photocatalytic reduction products formed on various catalysts. The Au3Cu@STO/TiO2 array (red arrow) was the most reactive photocatalyst in this family to generate hydrocarbons from diluted CO2. Kang et al. Click to enlarge.|
Researchers from Japan’s National Institute for Materials Science (NIMS) and TU-NIMS Joint Research Center, Tianjin University, China have developed a new, particularly efficient photocatalytic system for the conversion of CO2 into CO and hydrocarbons. The system, reported in a paper in the journal Angewandte Chemie, may be a step closer to CO2-neutral hydrocarbon fuels.
More than 130 kinds of photocatalysts have been investigated to catalyze CO2 reduction; of those, strontium titanate (SrTiO3, STO) and titania (TiO2) are two of the most investigated materials. The research team headed by Dr. Jinhua Ye decided to use both, and devised a heteromaterial consisting of arrays of coaxially aligned STO/TiO2 nanotubes.
Toshiba targeting practical implementation of conversion of solar energy and CO2 to feedstock and fuel in 2020s
December 03, 2014
|Mechanism of the technology. Source: Toshiba. Click to enlarge.|
Toshiba Corporation has developed a new technology that uses solar energy directly to generate carbon compounds from carbon dioxide and water, and to deliver a viable chemical feedstock or fuel with potential for use in industry. Toshiba introduced the technology at the 2014 International Conference on Artificial Photosynthesis (ICARP2014) on 26 November.
The long-term goal of the research work is to develop a technology compatible with carbon dioxide capture systems installed at facilities such as thermal power stations and factories, utilizing carbon dioxide to provide stockable and trailerable energy. Towards this, Toshiba said it will further improve the conversion efficiency by increasing catalytic activity, with the aim of securing practical implementation in the 2020s.
Researchers develop free-standing nanowire mesh for direct solar water-splitting to produce H2; new design for “artificial leaf”
|The mesh with BiVO4 nanowire photoanode for water oxidation and Rh-SrTiO3 nanowire photocathode for water reduction produces hydrogen gas without an electron mediator. Credit: ACS, Liu et al. Click to enlarge.|
Researchers from UC Berkeley, Lawrence Berkeley National Laboratory and Nanyang Technological University, Singapore have developed a new technology for direct solar water-splitting—i.e., an “artificial leaf” to produce hydrogen—based on a nanowire mesh that lends itself to large-scale, low-cost production. A paper describing their work is published in the journal ACS Nano.
In the design, semiconductor photocatalysts are synthesized as one-dimensional nanowires, which are assembled into a free-standing, paper-like mesh using a vacuum filtration process from the paper industry. When immersed in water with visible light irradiation (λ ≥ 400 nm), the mesh produces hydrogen gas. Although boosting efficiency remains a challenge, their approach—unlike other artificial leaf systems—is free-standing and doesn’t require any additional wires or other external devices that would add to the environmental footprint.
Stanford’s GCEP awards $10.5M for research on renewable energy; solar cells, batteries, renewable fuels and bioenergy
October 09, 2014
The Global Climate and Energy Project (GCEP) at Stanford University has awarded $10.5 million for seven research projects designed to advance a broad range of renewable energy technologies, including solar cells, batteries, renewable fuels and bioenergy. The seven awards bring the total number of GCEP-supported research programs to 117 since the project’s launch in 2002.
The new funding will be shared by six Stanford research teams and an international group from the United States and Europe. The following Stanford faculty members received funding for advanced research on photovoltaics, battery technologies and new catalysts for sustainable fuels:
OSU hybrid “solar battery” uses photo-assisted charging to improve performance of Li-air batteries; “negative overpotential”
October 03, 2014
Researchers at The Ohio State University have developed a novel strategy to improve the efficiency and performance of non-aqueous lithium-oxygen (Li-air) batteries. The team, led by Yiying Wu, professor of chemistry and biochemistry, integrated a dye-sensitized photoelectrode into a lithium-oxygen battery along with the oxygen electrode to enable “photo-assisted charging” of the Li-air cell.
The basic concept of the integrated solar battery is to use the contribution of the photovoltage to reduce greatly the charging overpotential caused by the difficulty in efficiently electrochemically decomposing lithium peroxide (Li2O2), the discharge product formed on the oxygen electrode. Overpotential otherwise causes low round-trip efficiency as well as degradation of the oxygen electrode and electrolyte. A paper on their work appears in the journal Nature Communications.
EPFL team develops low-cost water splitting cell with solar-to-hydrogen efficiency of 12.3%
September 26, 2014
A team led by Dr. Michael Grätzel at EPFL (Ecole Polytechnique Fédérale de Lausanne) in Switzerland has developed a highly efficient and low-cost water-splitting cell combining an advanced perovskite tandem solar cell and a bi-functional Earth-abundant catalyst.
The combination of the two delivers a water-splitting photocurrent density of around 10 milliamperes per square centimeter, corresponding to a solar-to-hydrogen efficiency of 12.3%. (Currently, perovskite instability limits the cell lifetime.) Their paper is published in the journal Science. In a companion Perspective in the journal, Dr. Thomas Hamann of Michigan State University, who was not involved with the study, called Grätzel’s team’s work “an important step towards achieving [the] goal” of quickly developing alternative sources of energy that can replace fossil fuels.
Solar fuels company Joule looks to partner with Scatec Solar to bring photovoltaic power to Joule production plants
September 05, 2014
Joule, the developer of a direct, single-step, continuous process for the production of solar hydrocarbon fuels (earlier post), has entered into a memorandum of understanding (MoU) with Scatec Solar ASA, a leading, independent solar power producer. In the MoU the parties have agreed to initiate a process to reach specific terms for a partnership, to support the roll-out of Joule production plants featuring photovoltaic power.
The terms of the MoU anticipate that Scatec Solar ASA will become preferred supplier and operator of photovoltaic power installations for Joule plants, with an initial deployment goal of up to 25,000 acres (~10,000 hectares) and a power requirement of 2 gigawatts. A deployment of this scale would generate up to 625 million gallons (~15 million barrels) of ethanol or 375 million gallons (~9 million barrels) of diesel per year, while consuming about 4 million tonnes of industrial waste CO2 annually in the process.
MIT team proposes process to recycle lead-acid batteries to fabricate solar cells
August 18, 2014
Researchers at MIT have devised an environmentally-responsible process to recycle materials from discarded automotive lead-acid batteries to fabricate efficient organolead halide perovskite solar cells (PSCs)—a promising new large-scale and cost-competitive photovoltaic technology. The process simultaneously avoids the disposal of toxic battery materials and provide alternative, readily-available lead sources for PSCs.
The system is described in a paper in the RSC journal Energy and Environmental Science, co-authored by professors Angela M. Belcher and Paula T. Hammond, graduate student Po-Yen Chen, and three others.
Molecular shuttle speeds up hydrogen production by the photocatalytic splitting of water
August 15, 2014
In their latest experiments with semiconductor nanocrystals as light absorbers, physicists led by Professor Jochen Feldmann (Ludwig-Maximilians-Universität München, LMU Munich), in collaboration with a team of chemists under the direction of Professor Andrey Rogach (City University of Hong Kong), have succeeded in significantly increasing the yield of hydrogen produced by the photocatalytic splitting of water.
The crucial innovation, reported in the latest issue of the journal Nature Materials, is the use of a so-called molecular shuttle to markedly improve the mobility of charge carriers in their reaction system.
RIKEN researchers develop bio-inspired catalyst that splits water at neutral pH
August 09, 2014
Plants use photosynthesis to convert carbon dioxide and water into sugars and oxygen. The process starts in a cluster of manganese, calcium and oxygen atoms at the heart of a protein complex called photosystem II, which splits water to form oxygen gas, protons and electrons.
Numerous researchers have attempted to develop synthetic catalysts that mimic this cluster, using light or electricity to convert water into fuels such as hydrogen gas. Unlike plants, however, these artificial catalysts can only split alkaline water, which makes the process less sustainable. Now, researchers at the RIKEN Center for Sustainable Resource Science in Japan have developed a manganese oxide-based catalyst system that can split water efficiently at neutral pH. They report on their work in an open access paper in the journal Nature Communications.
Volkswagen and Audi launch sustainability programs for US introduction of e-Golf BEV and A3 e-tron PHEV; carbon offsets with 3Degrees and solar energy
August 05, 2014
Volkswagen of America, Inc. introduced several e-mobility sustainability initiatives to commence with the US launch of the battery-electric e-Golf (earlier post). These begin with an investment in carbon reduction projects via a partnership with 3Degrees to offset emissions created from e-Golf production, distribution and from the estimated emissions produced from keeping the vehicle charged through the initial 36,000 miles of its life. VoA made the announcement at the Management Briefing Seminar, hosted by the Center for Automotive Research.
Volkswagen of America also selected SunPower as VW’s official solar energy partner; Bosch Automotive Service Solutions as its preferred home-charging and installation services provider; and ChargePoint to provide charging stations to the VW dealer network and to provide US e-Golf owners access to consumers to more than 18,000 charging stations nationwide. The 2015 e-Golf will go on sale later this year at participating dealerships in select states.
DOE awards $100M in 2nd funding round for 32 Energy Frontier Research Centers
June 24, 2014
The US Department of Energy (DOE) is awarding $100 million in the second round of funding for Energy Frontier Research Centers (EFRCs); research supported by this initiative will enable fundamental advances in energy production, storage, and use.
The 32 projects receiving funding were competitively selected from more than 200 proposals. Ten of these projects are new while the rest received renewed funding based both on their achievements to date and the quality of their proposals for future research.
Lux Research: cost of electrofuels remains far from viable
June 09, 2014
|Production costs per barrel of oil equivalent. Source: Lux Research. Click to enlarge.|
The cost of electrofuels—fuels produced by catalyst-based systems for light capture, water electrolysis, and catalytic conversion of carbon dioxide and hydrogen to liquid fuels—remains far away from viable, according to a new analysis by Lux Research.
Building a cost model for the electrolysis process—considering electricity from various routes, such as natural gas and coal as well as renewable electricity from biomass, solar, and wind, as well as generously assuming commercial scale production—Lux found that electrofuels produced from microbes cost $230 per barrel, while a catalytic conversion to make electrofuels produces fuels for $208 per barrel.
Study suggests energy and GHG impacts of synthetic hydrocarbon fuels from CO2 are greater than impacts of existing hydrocarbon fuels
June 06, 2014
|Synthetic fuel production from fuel-combustion-based energy and CO2 (top) and from atmospheric CO2 using solar electricity (bottom). Credit: ACS, van der Giesen et al. Click to enlarge.|
Researchers at the Institute of Environmental Sciences at Leiden University, The Netherlands) have concluded that the energy demand and climate impacts of using CO2 to produce synthetic hydrocarbon fuels by using existing technologies can be greater than the impacts of existing hydrocarbon fuels. Their quantitative lifecycle assessment of the environmental merits of liquid hydrocarbon fuels produced from CO2, water and energy compared to alternative fuel production routes is published in the ACS journal Environmental Science & Technology.
In their study, the researchers evaluated five hypothetical production routes using different sources of CO2 and energy. The team undertook the work specifically to investigate four general arguments that have been proposed in support of such fuels:
GM reduced energy intensity and carbon intensity per vehicle in 2013
May 20, 2014
In 2013, GM reduced the energy-intensity per vehicle manufactured 3.5% from 2012, down to an average 2.22 MW/vehicle from 2.30 MW, according to the company’s just released 2013 sustainability report. GM has set a target of 1.97 MW/vehicle for 2020, a reduction of 20% from the 2010 baseline of 2.47 MW.
The carbon intensity (CI) per vehicle dropped to 0.87 tonnes CO2e/vehicle in 2013, down 1.1% from 0.88 tonnes in 2012. The 2020 target is 0.74 tonnes CO2e, down 20% from the 2010 baseline of 0.93 tonnes. (CI includes all manufacturing and non-manufacturing CO2e emissions reported in the Carbon Disclosure Project (CDP) Scope 1 & 2 categories (earlier post), normalized by vehicle production. These data include data from some GM JVs.)
UC Riverside opening Sustainable Integrated Grid Initiative; integration of solar energy, battery storage and electric and hybrid vehicles
May 15, 2014
|Schematic of the “New Grid Testbed” components, including renewable energy generation, energy storage, smart distribution and electric transportation Click to enlarge.|
The University of California, Riverside is opening its Sustainable Integrated Grid Initiative to research the integration of: intermittent renewable energy, such as photovoltaic solar panels; energy storage, such as batteries; and all types of electric and hybrid electric vehicles. It is the largest renewable energy project of its kind in California.
The first two years of operation is supported by a $2-million contract from the South Coast Air Quality Management District, awarded in January 2012. Construction of the initial testbed platform was also supported by an additional $10 million in contributions from UC Riverside and private partners. The testbed, which is located at UC Riverside’s Bourns College of Engineering Center for Environmental Research and Technology (CE-CERT), includes:
SOLAR-JET project demonstrates solar-driven thermochemical conversion of CO2 and water to jet fuel
April 28, 2014
|SOLAR-JET concentrated thermochemical reactor. Red arrow indicates ceria reduction (oxygen evolution); blue arrow indicates oxidation (fuel production). Click to enlarge.|
The EU-funded SOLAR-JET project has demonstrated the production of aviation kerosene from concentrated sunlight, CO2 captured from air, and water. The process has also the potential to produce any other type of fuel for transport applications, such as diesel, gasoline or pure hydrogen in a more sustainable way.
SOLAR-JET (Solar chemical reactor demonstration and Optimization for Long-term Availability of Renewable JET fuel) uses sunlight in a concentrated solar reactor to convert CO2 and water to syngas (a mixture of hydrogen and CO), which is then processed in a Fischer-Tropsch reactor to aviation kerosene.