A5036358006- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Electrochemical Analysis and Applications
- Catalysis and Hydrodesulfurization Studies
- Molecular Junctions and Nanostructures
- Catalytic Processes in Materials Science
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Memory and Neural Computing
- Child Nutrition and Water Access
- Nanoporous metals and alloys
- Wastewater Treatment and Reuse
- Marine Bivalve and Aquaculture Studies
- Wildlife Ecology and Conservation
- Species Distribution and Climate Change
- Advanced battery technologies research
- Marine and fisheries research
- Metal-Organic Frameworks: Synthesis and Applications
- Bat Biology and Ecology Studies
- Advancements in Battery Materials
- Analytical Chemistry and Sensors
- Urban Stormwater Management Solutions
- Catalysis and Oxidation Reactions
- Nuclear Physics and Applications
San Jose State University
2023-2025
Johnson Matthey (United States)
2013-2014
Johnson Matthey (United Kingdom)
2013-2014
University of Cambridge
2002-2010
Johnson Matthey (Germany)
2009
Technology Centre Prague
2009
Diamond Light Source
2009
Lawrence Livermore National Laboratory
2009
New Pt–Ni catalysts were made for PEMFCs with previously unachieved ORR activity and device durability that exceed the DOE 2017 targets commercialization.
Nanoporosity is a frequently reported phenomenon in bimetallic particle ensembles used as electrocatalysts for the oxygen reduction reaction (ORR) fuel cells. It generally considered favorable characteristic, because it increases catalytically active surface area. However, effect of nanoporosity on intrinsic activity and stability nanoparticle electrocatalyst has remained unclear. Here, we present facile atmosphere-controlled acid leaching technique to control formation Pt-Ni nanoparticles....
Abstract Managing lands for both wildlife conservation and accessible recreational opportunities can be a delicate balance. General trail use disturb range of species in variety well‐described ways, but the specific effects mountain biking on – an important management question remains controversial literature. In past, collecting data uses was time‐consuming expensive. Today, on‐line recreation apps automatically collect these data. This study used from social fitness app, Strava Metro, to...
Recent performance and cost studies predict that the high PGM loadings in electrodes of today's direct hydrogen fuel cells will prove a limiting factor their commercial viability for automotive applications. Significant breakthroughs electrocatalyst technology yielding materials with activity, low good durability are required. This paper reports on collaborative effort which has focussed exciting core-shell oxygen reduction catalysts pioneered by Brookhaven National Laboratory. These promise...
Cu K-edge X-ray absorption spectroscopy (XAS) has been used for the in situ structural characterization of monolayers prepared on both bare Au(111) and butanethiol self-assembled monolayer (BT-SAM)-modified electrodes by underpotential deposition (UPD) from a sulfate supporting electrolyte. In conjunction with electrochemical measurements, XAS studies enable assignment evolution interfacial structure systems as function applied potential. The measurements adlayer formation unmodified...
Pt and alloy catalysts for the PEMFC cathode fall short of high activities per gram required to enable large scale automotive commercialization. Thrifting active component in ORR catalyst via formation core shell is an exciting approach resolve this issue. monolayers have been deposited onto Pd3Co, Pd3Fe Ir cores using scaleable proprietary methods. Characterisation these materials, cyclic voltammetry, LEIS XPS, showed successful coating surface enhanced stability liquid electrolyte cycling...
Abstract Potable water scarcity is a global issue. Recent and ongoing droughts in the Western United States make residential conservation crucial. Several agencies have invested programs that educate residents on non-traditional sources, such as laundry-to-landscape (L2L) greywater systems, which reuse washing machine for outdoor irrigation. This study analyzed landscape vegetation 21 characteristics of 30 households with L2L systems Santa Clara County, California. Greywater from most even...
This study explores the changes in bulk composition/structure and oxygen reduction activity of two alloys, Pt7IrCo7 PtCo, caused by Co leaching during electrochemical cycles as a result membrane electrode assembly (MEA) fabrication procedures. Exposure to liquid electrolyte rotating disc (RDE) environment resulted substantial loss no stabilization from low levels Ir used ternary material. The true composition material was determined Pt8IrCo3 following initial exposure 0.1 M HClO4 (before...
The use of a gas microstrip detector in X-ray absorption spectroscopy allows energy-resolved electron detection under ambient conditions and thereby nondestructive depth profiling or greatly improved surface sensitivity (see scheme). Results an situ study heterogeneous chemical reaction preliminary electrochemical experiments are discussed.
Abstract not Available.
Performance degradation during start-up (SU) and shut-down (SD) is an important issue affecting durability lifetime of proton exchange membrane fuel cells (PEMFCs). SU/SD processes generate very dynamic (albeit, transient) operating conditions in which the local gas mixtures differ to those steady state conditions. Briefly, via diffusional shut down, air can slowly fill anode flow field cell causing air/H 2 front; conversely, a H /air front generated SU. These mixed-gas fronts cause cathode...
Pt-alloy catalysts have attracted much attention because of their high activity for the oxygen reduction reaction compared to that pure Pt catalysts. One variant catalyst is “dealloyed catalyst” made by first preparing an alloy precursor with a base-metal-to-Pt ratio (≥1:1) and then removing most base metal, resulting in Pt-rich particles (M:Pt ~1:3). 1 Removal metal (dealloying) electrochemical voltage cycling or acid leaching can result particle skin covering base-metal-rich core. It was...
United States. Department of Energy. Office Energy Efficiency and Renewable (Grant DE-E458)
Abstract not Available.
Abstract not Available.
Ein Gas-Mikrostreifendetektor in der Röntgenabsorptionsspektroskopie ermöglicht die energieaufgelöste Elektronendetektion unter Umgebungsbedingungen und so das zerstörungsfreie Aufstellen eines Tiefenprofils oder eine deutlich bessere Oberflächenempfindlichkeit (siehe Schema). Die Ergebnisse In-situ-Untersuchung einer heterogenen chemischen Reaktion erste elektrochemische Experimente werden diskutiert. Supporting information for this article is available on the WWW under...