Preparation and water splitting application of Se-doped CoMo-based composite material

Abstract

The invention belongs to a selenium-doped CoMoSe2-coated CoMoO4-NiCo2O4 nano composite material based on NiCo2O4 nanowires as a template, and particularly relates to the application of simple steps and short time consumption, and the selenium-doped CoMoSe2-coated CoMoO4-NiCo2O4 nano composite material can be used for hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and full hydrolysis. When the catalyst is used as a catalyst of HER, only 256 mV overpotential is needed when the current density reaches 100 mA cm <-2 >, the Tafel slope is as low as 92.79 mV dec-1, the impedance is only 4.308 ohm, and good stability can be kept within 60 h when the current density is 100 mA cm <-2 >. When the CoMoSe2 coated CoMoO4-NiCo2O4 is used as a catalyst of OER, the material only needs an overpotential of 312 mV when reaching the current density of 100 mA cm <-2 >, the Tafel slope is as low as 71.94 mV dec-1, the impedance is only 1.65 ohm, and good stability can be kept within 60 hours when the current density is 100 mA cm <-2 >. When the material is used as a fully-hydrolyzed catalytic material, only 1.79 V voltage is needed when the current density is 100 mA cm <-2 >, and good stability can be kept within 60 hours when the current density is 100 mA cm <-2 >. The electrocatalyst is low in price, easy to obtain, low in cost, simple and convenient to operate and high in operability, and is high in catalytic activity and excellent in stability.

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