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Efficient overall water splitting in acid with anisotropic metal nanosheets

  • 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
Publication Date
Feb 16, 2021
Kyoto University Research Information Repository


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. / 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.

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