Issue 11, 2017
From the journal:

Nanoscale

An efficient ternary CoP2xSe2(1−x) nanowire array for overall water splitting†

Kaili Liu,abc   Fengmei Wang,ab   Tofik Ahmed Shifa,ab   Zhenxing Wang,a   Kai Xu,ab   Yu Zhang,a   Zhongzhou Cheng,ad   Xueying Zhana  and  Jun He*a  

* Corresponding authors

a CAS Center for Excellence in Nanoscience, CAS Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology, Beijing 100190, China
E-mail: hej@nanoctr.cn

b University of Chinese Academy of Science, No. 19A Yuquan Road, Beijing 100049, China

c Sino-Danish Center for Education and Research, Beijing, China

d School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract

Developing earth-abundant and efficient bifunctional electrocatalysts for realizing the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) under alkaline conditions is an intriguing challenge. Here, ternary necklace-like CoP2xSe2(1−x) nanowire arrays are synthesized via simultaneously phosphorizing and selenizing Co(OH)2 nanowires. Owing to the substitution of the P atom in the ternary system, the optimal electronic structure of CoP2xSe2(1−x) can be obtained and the stability can also be enhanced for hydrogen evolution. Thus, the ternary CoP2xSe2(1−x) NWs are highly active for electrochemical hydrogen evolution in both acidic and alkaline media, achieving a current density of 10 mA cm −2 at overpotentials of 70 mV and 98 mV, respectively. To realize the overall water splitting, we further performed the experiment using the CoP2xSe2(1−x) NWs as a cathode and Co(OH)2 NWs as an anode, which requires a cell voltage of 1.65 V to afford a water splitting current density of 10 mA cm −2 in strong alkaline media (1.0 M KOH).

Graphical abstract: An efficient ternary CoP2xSe2(1−x) nanowire array for overall water splitting

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Article information

DOI
https://doi.org/10.1039/C7NR00460E
Article type
Paper
Submitted
19 Jan 2017
Accepted
12 Feb 2017
First published
16 Feb 2017

Nanoscale, 2017,9, 3995-4001

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An efficient ternary CoP2xSe2(1−x) nanowire array for overall water splitting

K. Liu, F. Wang, T. A. Shifa, Z. Wang, K. Xu, Y. Zhang, Z. Cheng, X. Zhan and J. He, Nanoscale, 2017, 9, 3995 DOI: 10.1039/C7NR00460E

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