碳纳米管表面Co/MoSe2莫特-肖特基异质结的构筑及高效析氢性能OA

Molybdenum selenide(MoSe2)has been regarded as an advanced electrocatalyst for the hydrogen evolution reaction(HER).However,its electrocatalytic performance is far inferior to platinum(Pt).Combining semiconductors with metals to con-struct Mott-Schottky heterojunctions has been considered as an effective method to enhance HER activity.In this work,we report a typical Mott-Schottky heterojunction composed of metal Co and semiconductor MoSe2 on carbon nanotubes(Co/MoSe2@CNT),pre-pared by a sol-gel process followed by thermal reduction.The characterization and theoretical calculations show that a Co/MoSe2 Mott-Schottky heterojunction can cause electron redistribution at the interface and form a built-in electric field,which not only op-timizes the free energy of hydrogen atom adsorption,but also improves the charge transfer efficiency during hydrogen evolution.Thus,the Co/MoSe2@CNT has excellent catalytic activity with a low overpotential of 185 mV at 10 mA cm-2 and a small Tafel slope of 69 mV dec-1.This work provides a new strategy for constructing Co/MoSe2 Mott-Schottky heterojunctions and highlights the Mott-Schottky effect,which may inspire the future development of more attractive Mott-Schottky electrocatalysts for H2 production.