Preparation Of Transitipn Metal Catalysts With Micro-nanostructure And Application In Catalytic Hydrogen Production

Hydrogen energy is regarded as the most promising clean energy in the 21st century.It has the prominent advantages of zero-carbon and high efficiency that traditional energy does not possess,which is the only way to achieve cross-energy network collaborative optimization in the foreseeable future.At present,preparation of hydrogen via a low-cost and efficient method is the key to realize the large-scale commercial application.This paper focused on the development of bimetallic sulfide catalysts with high performance,low cost and good tolerance.We prepared transition metal catalysts?Co-Mo-S?by hydrothermal method,and studied the microstructures and electrocatalytic hydrogen evolution properties of the catalysts.The mechanism of electrocatalytic enhancement was also discussed.We prepared CoMoS₂/N-rGO catalysts with the N-rich reductive graphene oxide as carrier by one-step hydrothermal synthesis.When 0.5 mL hydrogen peroxide and ammonia were added as additives,the catalyst was nano-dots with a size of 5-8 nm.And it exhibited excellent electrocatalytic performance toward hydrogen evolution in acidic solution,with a low onset overpotential?-54 mV?,a small Tafel slope(34.13 mV·dec^-1),and a low overpotential(?₁₀=-89 mV)for reaching a current density of 10 mA·cm^-2.Using hydrophilic carbon paper as carrier,we further constructed a self-supporting catalytic electrode CoMoS₃/CP with special morphology by one-step hydrothermal synthesis,and investigated the effects of the amount of additive on the microstructure and hydrogen evolution property of the sulfide.When adding 2.0 mL hydrogen peroxide,the catalyst exhibited three-dimensional patchy growth on the surface of carbon paper vertically.It exhibited excellent electrocatalytic performance toward hydrogen evolution in both acidic and alkaline solutions,with a low onset overpotential?-38 and-47 mV?,a small Tafel slope(20.76 and 24.98 mV·dec^-1),and a low overpotential(?₁₀=-64 and-101mV)for reaching a current density of 10 mA·cm^-2.Finally,we constructed a self-supporting negative electrode CoMoS₃/CP with radial hollow nanotube structure by a one-step hydrothermal synthesis,and investigated the growth process of hollow nanotubes and their effects on hydrogen analysis performance in different reaction time.When hydrothermal reaction was carried out for 20 h,the hollow tubular had the most complete structure,and exhibited excellent electrocatalytic performance toward hydrogen evolution in both acidic and alkaline solutions.It displayed a low onset overpotential?-35 and-48 mV?,a small Tafel slope(24.29 and 44.03mV·dec^-1),and a low overpotential(?₁₀=-93 and-115 mV)for reaching a current density of 10 mA·cm^-2.