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DOE OSTI · 2529389

Achieving Higher Activity of Acidic Oxygen Evolution Reaction Using an Atomically Thin Layer of IrO x over Co 3 O 4

Li, Gengnan [Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)] (ORCID:0000000305960126)·Priyadarsini, Adyasa [Florida A & M University, Tallahassee, FL (United States)] (ORCID:0000000233236058)·Xie, Zhenhua [Columbia University, New York, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)]·Kang, Sinwoo [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:000000018069891X)·Liu, Yuzi [Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)] (ORCID:0000000287331683)·Chen, Xiaobo [State University of New York (SUNY), Binghamton, NY (United States)]·Kattel, Shyam [University of Central Florida, Orlando, FL (United States)] (ORCID:0000000258435889)·Chen, Jingguang G. [Columbia University, New York, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000295922635)
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Abstract

The development of electrocatalysts with reduced iridium (Ir) loading for the oxygen evolution reaction (OER) is essential to produce low-cost green hydrogen from water electrolysis under acidic conditions. Herein, an atomically thin layer of iridium oxide (IrO x ) has been uniformly dispersed onto cobalt oxide (Co 3 O 4 ) nanocrystals to improve the efficient use of Ir for acidic OER. In situ characterization and theoretical calculations reveal that compared to the conventional IrOx cluster, the atomically thin layer of IrO x shows stronger interaction with the Co 3 O 4 and consequently higher OER activity due to the Ir-O-Co bond formation at the interface. Equally important, the facile synthetic method and the promising activity in the proton exchange membrane water electrolyzer, reaching 1 A cm -2 at 1.7 V with remarkable durability, enable potential scale-up applications. In conclusion, these findings provide a mechanistic understanding for designing active, stable and lower-cost electrocatalysts with well-defined structures for acidic OER.

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Li, Gengnan [Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)] (ORCID:0000000305960126), Priyadarsini, Adyasa [Florida A & M University, Tallahassee, FL (United States)] (ORCID:0000000233236058), Xie, Zhenhua [Columbia University, New York, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)], Kang, Sinwoo [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:000000018069891X), Liu, Yuzi [Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)] (ORCID:0000000287331683), Chen, Xiaobo [State University of New York (SUNY), Binghamton, NY (United States)], Kattel, Shyam [University of Central Florida, Orlando, FL (United States)] (ORCID:0000000258435889), Chen, Jingguang G. [Columbia University, New York, NY (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000295922635). 2025-02-13. Achieving Higher Activity of Acidic Oxygen Evolution Reaction Using an Atomically Thin Layer of IrO x over Co 3 O 4. https://doi.org/10.1021/jacs.4c17915

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