Nitrogen‐Doped CoP Electrocatalysts for Coupled Hydrogen Evolution and Sulfur Generation with Low Energy Consumption
- 17 May 2018
- journal article
- research article
- Published by Wiley in Advanced Materials
- Vol. 30 (27), e1800140
- https://doi.org/10.1002/adma.201800140
Abstract
Hydrogen production is the key step for the future hydrogen economy. As a promising H2 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 Fe2+, which is regenerated by a coupled H2S absorption reaction. The coupled system can significantly reduce the energy consumption of the HER and recover useful sulfur sources.Keywords
Funding Information
- National Natural Science Foundation of China (21776121)
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