Heterostructured Au–Ir Catalysts for Enhanced Oxygen Evolution Reaction

Chen, Peng-Cheng; Li, Mufan; Jin, Jianbo; Yu, Sunmoon; Chen, Shouping; Chen, Chubai; Salmeron, Miquel; Yang, Peidong

doi:10.1021/acsmaterialslett.1c00428

Title: Heterostructured Au–Ir Catalysts for Enhanced Oxygen Evolution Reaction

Journal Article · Mon Aug 30 00:00:00 EDT 2021 · ACS Materials Letters

DOI:https://doi.org/10.1021/acsmaterialslett.1c00428· OSTI ID:1832551

^[1]; Li, Mufan ^[2];

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^[3]; Chen, Chubai ^[1];

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Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Electrochemical water splitting operated under acidic conditions provides a clean approach to generate hydrogen fuels. Currently, the sluggish kinetics of oxygen evolution reaction (OER) at the anode is a bottleneck limiting the acidic water splitting. Here, we report that the OER activity of Ir, one of the most commonly used OER catalysts, can be boosted by forming phase boundaries with Au. Mixed Au and Ir catalysts were synthesized on carbon paper electrodes, which underwent structural evolution under the OER environment to form an Au-Ir interface-rich structure. Compared with Ir catalyst, which requires an overpotential of ~393 mV to achieve a current density of 10 mA/cm² in 0.1 M HClO₄ electrolyte, the evolved Au-Ir catalyst shows a lower overpotential at ~351 mV. X-ray photoelectronic spectrum (XPS) study, in conjunction with electrochemical analysis on the surface-site-normalized activity, reveals that the improved OER performance is due to the presence of Au/Ir interfaces in the catalysts. In addition to Ir, the strategy of accelerating OER via Au/Ir interfaces has been further applied to IrCo, IrNi, and IrCu alloy catalysts. Here, with the broad applicability of the strategy demonstrated, this study opens a new route to design OER catalysts for efficient acidic water splitting.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1832551

Journal Information:: ACS Materials Letters, Vol. 3, Issue 10; ISSN 2639-4979

Publisher:: ACS PublicationsCopyright Statement

Country of Publication:: United States

Language:: English

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