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Main Title: Record activity and stability of dealloyed bimetallic catalysts for proton exchange membrane fuel cells
Author(s): Han, Binghong
Carlton, Christopher E.
Kongkanand, Anusorn
Kukreja, Ratandeep S.
Theobald, Brian R.
Gan, Lin
O'Malley, Rachel
Strasser, Peter
Wagner, Frederick T.
Shao-Horn, Yang
Type: Article
Language Code: en
Abstract: We demonstrate the unprecedented proton exchange membrane fuel cell (PEMFC) performance durability of a family of dealloyed Pt-Ni nanoparticle catalysts for the oxygen reduction reaction (ORR), exceeding scientific and technological state-of-art activity and stability targets. We provide atomic-scale insight into key factors controlling the stability of the cathode catalyst by studying the influence of particle size, the dealloying protocol and post-acid-treatment annealing on nanoporosity and passivation of the alloy nanoparticles. Scanning transmission electron microscopy coupled to energy dispersive spectroscopy data revealed the compositional variations of Ni in the particle surface and core, which were combined with an analysis of the particle morphology evolution during PEMFC voltage cycling; together, this enabled the elucidation of alloy structure and compositions conducive to long-term PEMFC device stability. We found that smaller size, less-oxidative acid treatment and annealing significantly reduced Ni leaching and nanoporosity formation while encouraged surface passivation, all resulting in improved stability and higher catalytic ORR activity. This study demonstrates a successful example of how a translation of basic catalysis research into a real-life device technology may be done.
Issue Date: 2015
Date Available: 25-Oct-2017
DDC Class: 690 Hausbau, Bauhandwerk
Sponsor/Funder: DFG, SPP 1613, Regenerativ erzeugte Brennstoffe durch lichtgetriebene Wasserspaltung: Aufklärung der Elementarprozesse und Umsetzungsperspektiven auf technologische Konzept
Journal Title: Energy & environmental science
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 8
Issue: 1
Publisher DOI: 10.1039/c4ee02144d
Page Start: 258
Page End: 266
EISSN: 1754-5706
ISSN: 1754-5692
Appears in Collections:FG Technische Chemie » Publications

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