Improved interfacial H2O supply by surface hydroxyl groups for enhanced alkaline hydrogen evolution

摘要: Robust hydrogen evolution reaction (HER) in alkaline solution using a cost-effective catalyst is still critical challenge for industrial H2O electrolysis. The dramatic depletion of interfacial and hindered OH− diffusion bring about harsh environment thereby lead to sluggish evolution. Here we develop heterogeneous catalysts based on defect-rich three-dimensional graphene (M/3D graphene) achieve improved HER kinetics via surface hydroxyl group modification the surface. Our theoretical studies suggest that groups derived from hydroxylation process effectively attract multi-overlayer clusters without any thermodynamic barrier form reservoir continuously supply catalytic sites. Electrochemical characterizations indicate per active electrochemical area have been greatly after crafting abundant 3D framework, which can be attributed sufficient proton donors an ameliorative pH environment. Benefiting modification, MoS2/3D structure facilitates at low onset potential 60 mV medium exhibits excellent durability 3000 cycles. This strategy reveals importance provides general guidance designing highly efficient medium.