DataVXACS Applied Energy MaterialsPaper
journal article·2022-07-25

Alloyed Pt–Zn Oxygen Reduction Catalysts for Proton Exchange Membrane Fuel Cells

Samuel M. Dull, Olga Vinogradova, Shicheng Xu, David M. Koshy, Per Erik Vullum, Jan Torgersen, Sebastian Kirsch, Venkatasubramanian Viswanathan, Thomas F. Jaramillo, Fritz B. Prinz

ACS Applied Energy Materials· Volume 5· Issue 7
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Source abstract

Abstract

Better oxygen reduction catalysts are needed to appreciably increase the efficiency of proton exchange membrane fuel cells. In this work, high-activity Pt–Zn alloy catalysts were prepared using two distinct synthetic approaches. The first─where Zn was introduced to Pt nanoparticles via atomic layer deposition─led to a 30% increase in Pt-mass-normalized fuel cell activity. Density functional theory calculations elucidated the origin of this enhancement and motivated the preparation of an alloy with increased Zn content. To this end, a fabrication technique leveraging Zn electroplating was employed to prototype a second Pt–Zn alloy with a rotating disk electrode (RDE). The higher-dosed structure (∼19 at. % Zn) delivered exemplary activity (MA = ∼3 A/mgPt), but the synthetic approach was not amenable to membrane electrode assembly (MEA) fabrication. An Arrhenius analysis was carried out to project the hypothetical catalytic enhancement under fuel cell operating conditions. This exercise introduced a discussion on the reduced activity observed in MEAs relative to the benchtop RDE setups used more ubiquitously for catalyst evaluation.
Source: openalex_inverted_index · Quality: baseline

Research context

Metals & alloysNanomaterialsCatalysis & surfacesMaterials processing

OpenAlex topics: Electrocatalysts for Energy Conversion · Fuel Cells and Related Materials · Advanced battery technologies research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States

SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States

Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States

Department of Mechanical Engineering, Stanford University, Stanford, California 94305, United States

SINTEF, Trondheim NO-7465, Norway

Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, Trondheim NO-7491, Norway

Volkswagen Group Research, Wolfsburg 38440, Germany

Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States

Department of Material Science and Engineering, Stanford University, Stanford, California 94305, United States

Funding

Volkswagen of America

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