Efficient overall water splitting in acid with anisotropic metal nanosheets

Dongshuang Wu (), Kohei Kusada (), Satoru Yoshioka, Tomokazu Yamamoto, Takaaki Toriyama, Syo Matsumura, Yanna Chen, Okkyun Seo, Jaemyung Kim, Chulho Song, Satoshi Hiroi, Osami Sakata, Toshiaki Ina, Shogo Kawaguchi, Yoshiki Kubota, Hirokazu Kobayashi and Hiroshi Kitagawa ()
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Dongshuang Wu: Kyoto University
Kohei Kusada: Kyoto University
Satoru Yoshioka: Kyushu University
Tomokazu Yamamoto: Kyushu University
Takaaki Toriyama: Kyushu University
Syo Matsumura: Kyushu University
Yanna Chen: Synchrotron X-ray Group and Synchrotron X-ray Station at SPring-8, National Institute for Materials Science
Okkyun Seo: Synchrotron X-ray Group and Synchrotron X-ray Station at SPring-8, National Institute for Materials Science
Jaemyung Kim: Synchrotron X-ray Group and Synchrotron X-ray Station at SPring-8, National Institute for Materials Science
Chulho Song: Synchrotron X-ray Group and Synchrotron X-ray Station at SPring-8, National Institute for Materials Science
Satoshi Hiroi: Synchrotron X-ray Group and Synchrotron X-ray Station at SPring-8, National Institute for Materials Science
Osami Sakata: Synchrotron X-ray Group and Synchrotron X-ray Station at SPring-8, National Institute for Materials Science
Toshiaki Ina: Research and Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI)
Shogo Kawaguchi: Research and Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI)
Yoshiki Kubota: Osaka Prefecture University
Hirokazu Kobayashi: Kyoto University
Hiroshi Kitagawa: Kyoto University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Water is the only available fossil-free source of hydrogen. Splitting water electrochemically is among the most used techniques, however, it accounts for only 4% of global hydrogen production. One of the reasons is the high cost and low performance of catalysts promoting the oxygen evolution reaction (OER). Here, we report a highly efficient catalyst in acid, that is, solid-solution Ru‒Ir nanosized-coral (RuIr-NC) consisting of 3 nm-thick sheets with only 6 at.% Ir. Among OER catalysts, RuIr-NC shows the highest intrinsic activity and stability. A home-made overall water splitting cell using RuIr-NC as both electrodes can reach 10 mA cm−2geo at 1.485 V for 120 h without noticeable degradation, which outperforms known cells. Operando spectroscopy and atomic-resolution electron microscopy indicate that the high-performance results from the ability of the preferentially exposed {0001} facets to resist the formation of dissolvable metal oxides and to transform ephemeral Ru into a long-lived catalyst.

Date: 2021
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DOI: 10.1038/s41467-021-20956-4

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