Journal ArticleDOI
Study of the Exchange Current Density for the Hydrogen Oxidation and Evolution Reactions
TLDR
In this paper, the exchange current density for the hydrogen oxidation/evolution reactions was determined in a proton exchange membrane fuel cell, and the transfer coefficient was found to lie within the range of 235-600 mA/cm 2 Pt and 0.5-1, respectively.Abstract:
The exchange current density for the hydrogen oxidation/evolution reactions was determined in a proton exchange membrane fuel cell. Ultralow Pt-loaded electrodes (0.003 mg pt /cm 2 ) were used to obtain measurable kinetic overpotential signals (50 mV at 2 A/cm 2 ). Using a simple Butler-Volmer equation, the exchange current density and transfer coefficient were determined to lie within the range of 235-600 mA/cm 2 Pt and 0.5-1, respectively. Due to the fast kinetics, no measurable voltage losses are predicted for pure-H 2 /air proton exchange membrane fuel cell applications when lowering the anode Pt loadings from its current value of 0.4 mg pt /cm 2 to the automotive target of 0.05 mg pt /cm 2 .read more
Citations
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Journal ArticleDOI
Benchmarking Hydrogen Evolving Reaction and Oxygen Evolving Reaction Electrocatalysts for Solar Water Splitting Devices
Charles C. L. McCrory,Suho Jung,Ivonne M. Ferrer,Shawn Chatman,Jonas C. Peters,Thomas F. Jaramillo +5 more
TL;DR: A standard protocol is used as a primary screen for evaluating the activity, short-term (2 h) stability, and electrochemically active surface area (ECSA) of 18 and 26 electrocatalysts for the hydrogen evolution reaction (HER and OER) under conditions relevant to an integrated solar water-splitting device in aqueous acidic or alkaline solution.
Journal ArticleDOI
Anion-exchange membranes in electrochemical energy systems
John R. Varcoe,Plamen Atanassov,Dario R. Dekel,Andrew M. Herring,Michael A. Hickner,Paul A. Kohl,Anthony Kucernak,William E. Mustain,DC Kitty Nijmeijer,Keith Scott,Tongwen Xu,L Lin Zhuang +11 more
TL;DR: In this paper, an up-to-date perspective on the use of anion-exchange membranes in fuel cells, electrolysers, redox flow batteries, reverse electrodialysis cells, and bioelectrochemical systems (e.g. microbial fuel cells).
Journal ArticleDOI
The Mechanism of Water Oxidation: From Electrolysis via Homogeneous to Biological Catalysis
TL;DR: In this article, a review compares and unifies viewpoints on water oxidation from various fields of catalysis research, including thermodynamic efficiency and mechanisms of electrochemical water splitting by metal oxides on electrode surfaces, explaining the recent concept of the potential determining step.
Journal ArticleDOI
Hydrogen Oxidation and Evolution Reaction Kinetics on Platinum: Acid vs Alkaline Electrolytes
TL;DR: In this article, the Butler-Volmer equation was fitted to the HOR/HER exchange current densities on polycrystalline platinum and high surface area carbon-supported platinum nanoparticles using rotating disk electrode (RDE) measurements.
Journal ArticleDOI
Iron-based cathode catalyst with enhanced power density in polymer electrolyte membrane fuel cells
Eric Proietti,Frédéric Jaouen,Michel Lefèvre,Nicholas Larouche,Juan Tian,Juan Herranz,Jean-Pol Dodelet +6 more
TL;DR: This work reports an iron-acetate/phenanthroline/zeolitic-imidazolate-framework-derived electrocatalyst with increased volumetric activity and enhanced mass-transport properties in polymer-electrolyte-membrane fuel cells.
References
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Journal ArticleDOI
Activity benchmarks and requirements for Pt, Pt-alloy, and non-Pt oxygen reduction catalysts for PEMFCs
TL;DR: In this article, the authors quantified the activities and voltage loss modes for state-of-the-art MEAs (membrane electrode assemblies), specifies performance goals needed for automotive application, and provides benchmark oxygen reduction activities for state of the art platinum electrocatalysts.
Reference BookDOI
Handbook of Heterogeneous Catalysis
TL;DR: This paper presents a meta-modelling system that automates the very labor-intensive and therefore time-heavy and therefore expensive and expensive process of characterization and activation of Solid Catalysts.
Book
Handbook of fuel cells : fundamentals technology and applications
TL;DR: In this article, the authors present a survey of fuel cell technologies and applications, focusing on hydrogen storage, hydrogen generation, and other energy conversion related topics, as well as their applications.
Journal ArticleDOI
Characterization of High‐Surface‐Area Electrocatalysts Using a Rotating Disk Electrode Configuration
Thomas J. Schmidt,Hubert A. Gasteiger,G. D. Stäb,Peter Urban,Dieter M. Kolb,Rolf Jürgen Behm +5 more
TL;DR: In this article, a method for the characterization of the electrocatalytic properties of highly dispersed electro catalysts in a true rotating disk electrode configuration by attaching the catalyst powder on a glossy carbon electrode via a thin Nafion film is presented.
Journal ArticleDOI
A Reverse-Current Decay Mechanism for Fuel Cells
Carl A. Reiser,Lawrence J. Bregoli,Timothy W. Patterson,Jung S. Yi,J. Deliang Yang,Michael L. Perry,Thomas D. Jarvi +6 more
TL;DR: In this article, a mechanism that may cause accelerated performance decay of fuel cells is presented using a one-dimensional model of the potential profile, which indicates that the electrolyte potential drops from 0 to 1.44 V, causing carbon corrosion, which decreases performance.