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Nano Research

Article Title

Flexible cobalt phosphide network electrocatalyst for hydrogen evolution at all pH values

Authors

Jianwen Huang, State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China College of Physics, Optoelectronics and Energy, Institute of Chemical Power Sources & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
Yanrong Li, State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
Yufei Xia, College of Physics, Optoelectronics and Energy, Institute of Chemical Power Sources & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
Juntong Zhu, College of Physics, Optoelectronics and Energy, Institute of Chemical Power Sources & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
Qinghua Yi, College of Physics, Optoelectronics and Energy, Institute of Chemical Power Sources & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
Hao Wang, College of Physics, Optoelectronics and Energy, Institute of Chemical Power Sources & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
Jie Xiong, State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
Yinghui Sun, College of Physics, Optoelectronics and Energy, Institute of Chemical Power Sources & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
Guifu Zou, College of Physics, Optoelectronics and Energy, Institute of Chemical Power Sources & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China

Keywords

hydrogen evolution, CoP network, nanocrystalline, flexible, all-pH

Abstract

ABSTRACT High-performance electrocatalysts for water splitting at all pH values have attracted considerable interest in the field of sustainable hydrogen evolution. Herein, we report an efficient electrocatalyst with a nanocrystalline cobalt phosphide (CoP) network for water splitting in the pH range of 0–14. The novel flexible electrocatalyst is derived from a desirable nanocrystalline CoP network grown on a conductive Hastelloy belt. This kind of self-supported CoP network is directly used as an electrocatalytic cathode for hydrogen evolution. The nanocrystalline network structure results in superior performance with a low onset overpotential of ~45 mV over a broad pH range of 0 to 14 and affords a catalytic current density of 100 mA·cm−2 even in neutral media. The CoP network exhibits excellent catalytic properties not only at extreme pH values (0 and 14) but also in neutral media (pH = 7), which is comparable to the behavior of state-of-the-art platinum-based metals. The system exhibits an excellent flexible property and maintains remarkable catalytic stability during continuous 100-h-long electrolysis even after 100 cycles of bending/extending from 100° to 250°.

Graphical Abstract

Publisher

Tsinghua University Press

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