Boosting oxygen evolution of single-atomic ruthenium through electronic coupling with cobalt-iron layered double hydroxides

Pengsong Li, Maoyu Wang, Xinxuan Duan, Lirong Zheng, Xiaopeng Cheng, Yuefei Zhang, Yun Kuang, Yaping Li, Qing Ma, Zhenxing Feng (), Wen Liu () and Xiaoming Sun ()
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Pengsong Li: Beijing University of Chemical Technology
Maoyu Wang: Oregon State University
Xinxuan Duan: Beijing University of Chemical Technology
Lirong Zheng: Institute of High Energy Physics (IHEP) of the Chinese Academy of Sciences (CAS)
Xiaopeng Cheng: Beijing University of Technology
Yuefei Zhang: Beijing University of Technology
Yun Kuang: Beijing University of Chemical Technology
Yaping Li: Beijing University of Chemical Technology
Qing Ma: Northwestern University
Zhenxing Feng: Oregon State University
Wen Liu: Beijing University of Chemical Technology
Xiaoming Sun: Beijing University of Chemical Technology

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract Single atom catalyst, which contains isolated metal atoms singly dispersed on supports, has great potential for achieving high activity and selectivity in hetero-catalysis and electrocatalysis. However, the activity and stability of single atoms and their interaction with support still remains a mystery. Here we show a stable single atomic ruthenium catalyst anchoring on the surface of cobalt iron layered double hydroxides, which possesses a strong electronic coupling between ruthenium and layered double hydroxides. With 0.45 wt.% ruthenium loading, the catalyst exhibits outstanding activity with overpotential 198 mV at the current density of 10 mA cm−2 and a small Tafel slope of 39 mV dec−1 for oxygen evolution reaction. By using operando X-ray absorption spectroscopy, it is disclosed that the isolated single atom ruthenium was kept under the oxidation states of 4+ even at high overpotential due to synergetic electron coupling, which endow exceptional electrocatalytic activity and stability simultaneously.

Date: 2019
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DOI: 10.1038/s41467-019-09666-0

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