C-Doped SnO2-Integrated MoSe2/MoS2 Heterostructure as a High-Performance Bifunctional Electrocatalyst for Overall Water Splitting

Abstract Overall water splitting powered by low-cost and efficient electrocatalysts offers a promising pathway for the sustainable production of H2 energy. Here, we have successfully designed and prepared a C-SnO2-MoSe2/MoS2 composite material comprising carbon-doped SnO2 and layered 2D materials (MoSe2 and MoS2) for overall water splitting. The composite exhibited attractive electrocatalytic activities for both HER and OER, possessing very low overpotentials and Tafel slopes, along with high faradaic efficiencies. Notably, the prepared composite material demonstrated bifunctional electrocatalytic activity for efficient overall water splitting, achieving a low cell potential of 1.72 V at 10 mA cm−2. Along with this high electrocatalytic efficiency, the composite presented long-term operational stability up to 90 h in overall water splitting.