Self-supporting MoSe2/CoSe2@CFP electrocatalyst electrode for high-efficiency HER under alkaline solution

Adopting a facile two-step hydrothermal method to fabricate an efficient hierarchical transition metal selenide MoSe2/CoSe2 nano-flakes (NFs) anchored on carbon fiber paper (CFP) as a high-efficiency electrocatalyst for hydrogen evolution reaction (HER). The morphology shows that the surface of CFP is uniformly covered by the abundant nanosheets. Benefitting from the hydrophilic, the nano-catalysts on the MoSe2/CoSe2@CFP can fully contact with water molecules and accelerate the electron transfer, therefore promoting the water splitting. The electrochemical measurement suggests that on condition that current density of 10 mA cm(-2), this nanometer electrocatalytic material has only an overpotential of 137 mV (vs. the RHE), which is lower as compared to CoSe2 (398 mV), MoSe 2 (461 mV) and CFP (595 mV). The Tafel slope of the nanocomposite is 55.9 mV dec(-1), which is lower than CoSe2 (138.1 mV dec(-1)) and MoSe2 (175.9 mV dec(-1)). Furthermore, the self-supporting nanocomposite exhibits outstanding stability in alkaline solution.