Quantifying the electrochemical active site density of precious metal-free catalysts in situ in fuel cells

Snitkoff-Sol, Rifael Z.; Friedman, Ariel; Honig, Hilah C.; Yurko, Yan; Kozhushner, Alisa; Zachman, Michael J.; Zelenay, Piotr; Bond, Alan M.; Elbaz, Lior

doi:10.1038/s41929-022-00748-9

Title: Quantifying the electrochemical active site density of precious metal-free catalysts in situ in fuel cells

Journal Article · 23 February 2022 · Nature Catalysis

DOI: https://doi.org/10.1038/s41929-022-00748-9 · OSTI ID:1866670

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^[1]; Honig, Hilah C. ^[1];

^[1]; Kozhushner, Alisa ^[1];

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Bar-Ilan Univ., Ramat Gan (Israel)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Monash Univ., Melbourne, VIC (Australia)
Bar-Ilan Univ., Ramat Gan (Israel); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Monash Univ., Melbourne, VIC (Australia); Univ. of New Mexico, Albuquerque, NM (United States)

We report advances in the development of precious-group metal-free (PGM-free) catalysts for the oxygen reduction reaction (ORR) in fuel cell cathodes have produced active catalysts that reduce the performance gap to the incumbent Pt-based materials. However, utilization of state-of-the-art PGM-free catalysts for commercial applications is currently impeded by their relatively low durability. Methods designed to study catalyst degradation in the operation of fuel cells are therefore critical for understanding durability issues and, ultimately, their solutions. Here we report the use of Fourier-transform alternating current voltammetry as an electrochemical method for accurate quantification of the electrochemically active site density of PGM-free cathode catalysts, and to follow their degradation in situ during the operation of polymer electrolyte fuel cells. Using this method, we were able to quantify the electrochemical active site density, which will enable the elucidation of degradation mechanisms of PGM-free ORR catalysts in situ in fuel cells.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Israeli Ministry of Energy; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1866670

Journal Information:: Nature Catalysis, Journal Name: Nature Catalysis Journal Issue: 2 Vol. 5; ISSN 2520-1158

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Quantifying the electrochemical active site density of precious metal-free catalysts in situ in fuel cells

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