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Nitrogen‐Doped CoP Electrocatalysts for Coupled Hydrogen Evolution and Sulfur Generation with Low Energy Consumption
Author(s) -
Zhou Qingwen,
Shen Zihan,
Zhu Chao,
Li Jiachen,
Ding Zhiyuan,
Wang Peng,
Pan Feng,
Zhang Zhiyong,
Ma Haixia,
Wang Shuangyin,
Zhang Huigang
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201800140
Subject(s) - hydrogen production , materials science , oxygen evolution , hydrogen , electronegativity , electrolysis , anode , sulfur , electrolysis of water , electrocatalyst , hydrogen economy , inorganic chemistry , nitrogen , chemical engineering , electrochemistry , electrode , chemistry , electrolyte , metallurgy , organic chemistry , engineering
Hydrogen production is the key step for the future hydrogen economy. As a promising H 2 production route, electrolysis of water suffers from high overpotentials and high energy consumption. This study proposes an N‐doped CoP as the novel and effective electrocatalyst for hydrogen evolution reaction (HER) and constructs a coupled system for simultaneous hydrogen and sulfur production. Nitrogen doping lowers the d‐band of CoP and weakens the H adsorption on the surface of CoP because of the strong electronegativity of nitrogen as compared to phosphorus. The H adsorption that is close to thermos‐neutral states enables the effective electrolysis of the HER. Only −42 mV is required to drive a current density of −10 mA cm −2 for the HER. The oxygen evolution reaction in the anode is replaced by the oxidation reaction of Fe 2+ , which is regenerated by a coupled H 2 S absorption reaction. The coupled system can significantly reduce the energy consumption of the HER and recover useful sulfur sources.