TY - JOUR
T1 - Efficient overall water splitting in acid with anisotropic metal nanosheets
AU - Wu, Dongshuang
AU - Kusada, Kohei
AU - Yoshioka, Satoru
AU - Yamamoto, Tomokazu
AU - Toriyama, Takaaki
AU - Matsumura, Syo
AU - Chen, Yanna
AU - Seo, Okkyun
AU - Kim, Jaemyung
AU - Song, Chulho
AU - Hiroi, Satoshi
AU - Sakata, Osami
AU - Ina, Toshiaki
AU - Kawaguchi, Shogo
AU - Kubota, Yoshiki
AU - Kobayashi, Hirokazu
AU - Kitagawa, Hiroshi
N1 - Funding Information:
We acknowledge the support from JST ACCEL program Grant Number JPMJAC1501 and Grant-in-Aid for Specially Promoted Research 20H05623. STEM observations were performed as a part of a program conducted by the Advanced Characterization Nanotechnology Platform sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese government. Synchrotron XRD measurements were performed at SPring-8 under proposal No. 2018A1215. The operando and ex situ XAFS experiment measurements were performed at SPring-8 under proposal Nos. 2018A1427, 2018B1353 and 2019A1123. The HAXPES measurements were performed at SPring-8 under proposal No. 2016B4910 and 2017A4910.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12/1
Y1 - 2021/12/1
N2 - 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.
AB - 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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U2 - 10.1038/s41467-021-20956-4
DO - 10.1038/s41467-021-20956-4
M3 - Article
C2 - 33594054
AN - SCOPUS:85100933800
SN - 2041-1723
VL - 12
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 1145
ER -
