Ultralow-loading platinum-cobalt fuel cell catalysts derived from imidazolate frameworks

Chong, Lina; Wen, Jianguo; Kubal, Joseph; Sen, Fatih G.; Zou, Jianxin; Greeley, Jeffery; Chan, Maria; Barkholtz, Heather; Ding, Wenjiang; Liu, Di-Jia

doi:10.1126/science.aau0630

Title: Ultralow-loading platinum-cobalt fuel cell catalysts derived from imidazolate frameworks

Journal Article · Thu Nov 08 00:00:00 EST 2018 · Science

DOI:https://doi.org/10.1126/science.aau0630· OSTI ID:1485751

;

; Kubal, Joseph;

; Zou, Jianxin; Greeley, Jeffery;

; Barkholtz, Heather; Ding, Wenjiang;

Achieving high catalytic performance with the lowest possible amount of platinum is critical for fuel cell cost reduction. Here we describe a method of preparing highly active yet stable electrocatalysts containing ultralow-loading platinum content by using cobalt or bimetallic cobalt and zinc zeolitic imidazolate frameworks as precursors. Synergistic catalysis between strained platinum-cobalt core-shell nanoparticles over a platinum-group metal (PGM)–free catalytic substrate led to excellent fuel cell performance under 1 atmosphere of O ₂ or air at both high-voltage and high-current domains. Two catalysts achieved oxygen reduction reaction (ORR) mass activities of 1.08 amperes per milligram of platinum (A mg _Pt ⁻¹ ) and 1.77 A mg _Pt ⁻¹ and retained 64% and 15% of initial values after 30,000 voltage cycles in a fuel cell. Computational modeling reveals that the interaction between platinum-cobalt nanoparticles and PGM-free sites improves ORR activity and durability.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; USDOE Office of Science (SC), Workforce Development for Teachers and Scientists (WDTS)

Grant/Contract Number:: AC02-06CH11357; AC02-05CH11231; SC0010379; SC0014664

OSTI ID:: 1485751

Alternate ID(s):: OSTI ID: 1493886

Journal Information:: Science, Journal Name: Science Vol. 362 Journal Issue: 6420; ISSN 0036-8075

Publisher:: American Association for the Advancement of Science (AAAS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 578 works

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Title: Ultralow-loading platinum-cobalt fuel cell catalysts derived from imidazolate frameworks

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