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Research Article

Surface reconstruction, doping and vacancy engineering to improve the overall water splitting of CoP nanoarrays

Yongkai Sun1Wenyuan Sun2Lihong Chen2Alan Meng3( )Guicun Li2Lei Wang3Jianfeng Huang4Aili Song5Zhenhui Zhang2Zhenjiang Li2( )
College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China
College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
School of Material Science and Engineering, International S&T Cooperation Foundation of Shaanxi Province, Xi’an Key Laboratory of Green Manufacture of Ceramic Materials, Shaanxi University of Science and Technology, Xi’an 710021, China
Qingdao Huanghai University, Qingdao 266000, China
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Graphical Abstract

Fluorination strategy significantly enhances the electrocatalytic performances of F-CoP nanoarrays (NAs)/copper foam (CF) for both hydrogen evolution and oxygen evolution reactions.

Abstract

Development of a general regulatory strategy for efficient overall water splitting remains a challenging task. Herein, a simple, cost-fairness, and general fluorination strategy is developed to realize surface reconstruction, heteroatom doping, and vacancies engineering over cobalt phosphide (CoP) for acquiring high-performance bifunctional electrocatalysts. Specifically, the surface of CoP nanoarrays (NAs) becomes rougher, meanwhile F doped into CoP lattice and creating amounts of P vacancies by fluorination, which caused the increase of active sites and regulation of charge distribution, resulting the excellent electrocatalyst performance of F-CoP NAs/copper foam (CF). The optimized F-CoP NAs/CF delivers a lower overpotential of only 35 mV at 10 mA·cm−2 for hydrogen evolution reaction (HER) and 231 mV at 50 mA·cm−2 for oxygen evolution reaction (OER), and the corresponding overall water splitting requires only 1.48 V cell voltage at 10 mA·cm−2, which are superior to the most state-of-the-art reported electrocatalysts. This work provides an innovative and feasible strategy to construct efficient electrocatalysts.

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12274_2022_4702_MOESM1_ESM.pdf (1.6 MB)
Nano Research
Pages 228-238
Cite this article:
Sun Y, Sun W, Chen L, et al. Surface reconstruction, doping and vacancy engineering to improve the overall water splitting of CoP nanoarrays. Nano Research, 2023, 16(1): 228-238. https://doi.org/10.1007/s12274-022-4702-y
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Received: 18 April 2022
Revised: 05 June 2022
Accepted: 26 June 2022
Published: 02 August 2022
© Tsinghua University Press 2022
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