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Title: Efficient overall water splitting in acid with anisotropic metal nanosheets
Authors: Wu, Dongshuang
Kusada, Kohei
Yoshioka, Satoru
Yamamoto, Tomokazu
Toriyama, Takaaki
Matsumura, Syo
Chen, Yanna
Seo, Okkyun
Kim, Jaemyung
Song, Chulho
Hiroi, Satoshi
Sakata, Osami
Ina, Toshiaki
Kawaguchi, Shogo
Kubota, Yoshiki
Kobayashi, Hirokazu
Kitagawa, Hiroshi
Author's alias: 呉, 冬霜
草田, 康平
吉岡, 聰
山本, 知一
鳥山, 誉亮
松村, 晶
廣井, 慧
坂田, 修身
伊奈, 稔哲
河口, 彰吾
久保田, 佳基
小林, 浩和
北川, 宏
Keywords: Electrocatalysis
Renewable energy
Issue Date: 16-Feb-2021
Publisher: Springer Nature
Journal title: Nature Communications
Volume: 12
Thesis number: 1145
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.
Description: 超高効率な水の電気分解を実現するナノシート状合金触媒を開発 --再生可能エネルギーによる水素社会実現へ大きく貢献--. 京都大学プレスリリース. 2021-02-17.
Rights: © The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
DOI(Published Version): 10.1038/s41467-021-20956-4
PubMed ID: 33594054
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