Accelerating water dissociation kinetics by isolating cobalt atoms into ruthenium lattice

Junjie Mao, Chun-Ting He, Jiajing Pei, Wenxing Chen, Dongsheng He, Yiqing He, Zhongbin Zhuang, Chen Chen, Qing Peng, Dingsheng Wang () and Yadong Li
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Junjie Mao: Anhui Normal University
Chun-Ting He: Jiangxi Normal University
Jiajing Pei: Beijing University of Chemical Technology
Wenxing Chen: Tsinghua University
Dongsheng He: South University of Science and Technology of China
Yiqing He: Tsinghua University
Zhongbin Zhuang: Beijing University of Chemical Technology
Chen Chen: Tsinghua University
Qing Peng: Tsinghua University
Dingsheng Wang: Tsinghua University
Yadong Li: Tsinghua University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Designing highly active and robust platinum-free catalysts for hydrogen evolution reaction is of vital importance for clean energy applications yet challenging. Here we report highly active and stable cobalt-substituted ruthenium nanosheets for hydrogen evolution, in which cobalt atoms are isolated in ruthenium lattice as revealed by aberration-corrected high-resolution transmission electron microscopy and X-ray absorption fine structure measurement. Impressively, the cobalt-substituted ruthenium nanosheets only need an extremely low overpotential of 13 mV to achieve a current density of 10 mA cm−2 in 1 M KOH media and an ultralow Tafel slope of 29 mV dec−1, which exhibit top-level catalytic activity among all reported platinum-free electrocatalysts. The theoretical calculations reveal that the energy barrier of water dissociation can greatly reduce after single cobalt atom substitution, leading to its superior hydrogen evolution performance. This study provides a new insight into the development of highly efficient platinum-free hydrogen evolution catalysts.

Date: 2018
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DOI: 10.1038/s41467-018-07288-6

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