Rice University scientists find possible replacement for platinum as catalyst
Rice University chemists who developed a unique form of graphene have found a way to embed metallic nanoparticles that turn the material into a useful catalyst for fuel cells and other applications.
Laser-induced graphene, created by the Rice lab of chemist James Tour last year, is a flexible film with a surface of porous graphene made by exposing a common plastic known as polyimide to a commercial laser-scribing beam. The researchers have now found a way to enhance the product with reactive metals.
The research appears this month in the American Chemical Society journal ACS Nano.
With the discovery, the material that the researchers call “metal oxide-laser induced graphene” (MO-LIG) becomes a new candidate to replace expensive metals like platinum in catalytic fuel-cell applications in which oxygen and hydrogen are converted to water and electricity.
“The wonderful thing about this process is that we can use commercial polymers, with simple inexpensive metal salts added,” Tour said. “We then subject them to the commercial laser scriber, which generates metal nanoparticles embedded in graphene. So much of the chemistry is done by the laser, which generates graphene in the open air at room temperature.
“These composites, which have less than 1 percent metal, respond as ‘super catalysts’ for fuel-cell applications. Other methods to do this take far more steps and require expensive metals and expensive carbon precursors.”
Initially, the researchers made laser-induced graphene with commercially available polyimide sheets. Later, they infused liquid polyimide with boron to produce laser-induced graphene with a greatly increased capacity to store an electrical charge, which made it an effective supercapacitor.
Read more: Laser-burned graphene gains metallic powers
The Latest on: Metal oxide-laser induced graphene
via Google News
The Latest on: Metal oxide-laser induced graphene
- Excitons in 2D perovskites for ultrafast terahertz photonic deviceson February 21, 2020 at 11:13 am
Recently, many developments have focused on functionalization of the metamaterials by integrating them with dynamic materials like semiconductors (24, 26–30), liquid crystals (31), superconductors (32 ...
- Mixed-signal hardware security thwarts electromagnetic attackson February 19, 2020 at 9:12 am
The team developed technology to use mixed-signal circuits to embed the crypto core within a signature attenuation hardware with lower-level metal routing, such that the critical signature is ...
- Ultra-long carrier lifetime in neutral graphene-hBN van der Waals heterostructures under mid-infrared illuminationon February 13, 2020 at 2:25 am
Graphene/hBN heterostructures are promising active materials for devices in the THz domain, such as emitters and photodetectors based on interband transitions. Their performance requires long ...
- Researchers develop new method for analyzing metalon February 12, 2020 at 2:02 pm
When mechanical parts slide against each other for long periods of time, the constant grinding may wear down the metal surfaces until ... speed of around 4.5 m/s induced a chemical reaction ...
- Graphene forms under microscope's eye (w/video)on February 12, 2020 at 10:57 am
(Nanowerk News) You don’t need a big laser to make laser-induced graphene (LIG). Scientists at Rice University, the University of Tennessee, Knoxville (UT Knoxville) and Oak Ridge National Laboratory ...
- New Method Helps Observe the Dynamic Motion of Atoms in 2D Materialson February 12, 2020 at 6:35 am
These 2D materials—namely borophene and graphene—are a group of single-layer ... titled “Direct Visualization of Electric Field-induced Structural Dynamics in Monolayer Transition Metal ...
- Laser-patterned metal and plastic can eliminate requirement for toxic varnishes for shipson February 11, 2020 at 4:00 pm
A European consortium is now using a 1-kW "dot matrix" ultrafast laser system to create antifouling hydrophobic surfaces on metal or plastic. The surfaces could soon replace the toxic varnishes used ...
- How manipulating ligand interactions in metal clusters can spur advances in nanotechnologyon February 5, 2020 at 9:59 am
When metal atoms form small clusters of a particular size, they show interesting and potentially useful electromagnetic characteristics, which are different from those of the actual bulk metal.
- Resolving hydrogen atoms at metal-metal hydride interfaceson January 31, 2020 at 11:08 am
It can, however, also be detrimental to metals, causing embrittlement. Understanding fundamental behavior of hydrogen at the atomic scale is key to improve the properties of metal-metal hydride ...
- It's closeness that counts: how proximity affects the resistance of grapheneon January 29, 2020 at 9:01 am
The results have been published in Nature Communications ("Substrate induced nanoscale resistance variation in epitaxial graphene"). View into the scanning tunnelling microscope showing its metal tip ...
via Bing News