[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.]
Univ. of Manchester team finds monolayer graphene permeable to protons; implications for PEM fuel cell and other hydrogen technologies
November 28, 2014
Researchers at the University of Manchester in the UK have found that monolayers of graphene—which, as a perfect monolayer is impermeable to all gases and liquids—and its sister material boron nitride (BN) are highly permeable to protons, especially at elevated temperatures and if the films are covered with catalytic nanoparticles such as platinum. The finding could have a significant impact on proton exchange membrane fuel cell technologies and other hydrogen-based technologies.
The discovery is reported in the journal Nature by an international team led by Professor Sir Andre Geim, who, with Professor Sir Kostya Novoselov succeeded in producing, isolating, identifying and characterizing graphene in 2004 at the University of Manchester, an achievement for which the pair won the Nobel Prize in Physics in 2010. (Graphene had been studied theoretically as far back as 1947; professors Geim and Novoselov were the first to fabricate and to study the material.)
Graphene 3D Lab showing prototype 3D printed battery; potential for structural batteries
October 27, 2014
Graphene 3D Lab Inc., which develops, manufactures, and markets proprietary graphene-based nanocomposite materials for various types of 3D printing, including fused filament fabrication, has developed a 3D printable graphene battery. CEO Daniel Stolyarov, presented the prototype 3D printable graphene battery at the Inside 3D Printing Conference in Santa Clara, CA last week.
Graphene 3D Labs combines graphene nanoplatelets with thermoplastics used in FFF (fused filament fabrication) 3D printing, ultimately resulting in a functionalized 3D printing filament offering electrical conductivity. Currently, the process requires the separate printing of individual components—i.e., cathode, anode, electrolyte. However, a true multi-material 3D printer would enable the printing of the entire battery in one single print, the company notes.
Rice BN-doped graphene quantum dots/graphene platelet hybrid material can outperform platinum as fuel cell catalyst
October 13, 2014
|Preparation procedure for the BN-GQD/G nanocomposite. Credit: ACS, Fei et al. Click to enlarge.|
A team at Rice University has created a hybrid material combining graphene quantum dots (GQDs) and graphene platelets that can—depending upon its formulation—outperform platinum as a catalyst for fuel cells.
The material showed an oxygen reduction reaction (ORR) of about 15 millivolts more in positive onset potential—the start of the reaction—and 70% larger current density than platinum-based catalysts. The materials required to make the flake-like hybrids are much cheaper, too, said Dr. James Tour, whose lab created GQDs from coal last year. A paper on their new work is published in the journal ACS Nano.
European consortium investigating graphene-based materials for lightweight cars; energy-efficient and safe vehicles
June 30, 2014
The University of Sunderland (UK), working with a consortium of five other research partners from Italy, Spain and Germany, has been selected for funding by the €1-billion (US$1.4-billion) Graphene Flagship research initiative in Europe (earlier post) for their iGCAuto proposal. The researchers will explore the properties of graphene to determine how it behaves when used to enhance advanced composite materials used in the production of cars. The other partners are Centro Ricerche FIAT (Italy); Fraunhofer ICT (Germany); Interquimica (Spain); Nanesa S.r.l. (Italy); and Delta-Tech S.p.A. (Italy).
As part of the work, a novel graphene-based polymer material will be investigated, modeled, and designed to enhance both vehicle and occupant safety while remaining very light. This material will provide benefits such as improved strength, dimensional stability, and superior durability.
Scientists discover potential way to make graphene superconducting
March 20, 2014
Scientists at the Department of Energy’s SLAC National Accelerator Laboratory, Stanford University and University College London have discovered a potential way to make a monolayer of graphene superconducting, a state in which it would carry electricity with 100% efficiency. Their open access paper is published in the journal Nature Communications.
The researchers used a beam of intense ultraviolet light to look deep into the electronic structure of calcium intercalated graphite (CaC6)—a material made of alternating layers of graphene and calcium. While it’s been known for nearly a decade that this combined material is superconducting, the new study offers the first compelling evidence that the graphene layers are instrumental in this process, a discovery that could transform the engineering of materials for nanoscale electronic devices.