Mos2 Nanoflowers Decorated Moo2 Heterostructure/Biochar Electrode with an Adjusting Electronic Structure for Boosting Electrocatalytic Hydrogen Production

Abstract

Advancing electrocatalytic hydrogen evolution technologies rely heavily on the development of inexpensive, highly active electrocatalysts. Although molybdenum dioxide (MoO2) and molybdenum disulfide (MoS2) are considered as promising non-precious metal electrocatalysts, their poor thermodynamic activity and low electrical conductivity limit their further application in electrocatalytic water splitting. In this work, via hydrothermal and chemical vapor phase deposition (CVD) strategy, the MoS2-decorated MoO2 grown on carbonized wood (MoS2-MoO2/CW) as high-performance electrode for boosting electrocatalytic hydrogen production. Wherein, the hydrogen evolution reaction (HER) activity of MoS2-MoO2/CW is enhanced by synergy effect of MoS2 with abundance of active sites, MoO2 with high electrical conductivity and CW with porosity. In particular, the tenderly designed electrode have a high double layer capacitance and excellent long-term stability, as well as a low overpotential (106 mV) at a current density of 10 mA cm−2. The results provide helpful guidelines for the development and fabrication of non-noble metal based composite electrocatalysts towards HER.

Keywords: Carbonized wood, MoS2, MoO2, Hydrogen evolution reaction