Construction And Electrocatalytic Hydrogen Generation Performance Study Of Cobalt-based Nanocatalyst

Hydrogen?H₂?,as a potential alternative to traditional fossil fuels with high energy density and renewable natures can be generated by electrocatalytic reduction of water.However,due to the problem of large energy consumption in electrocatalytic water splitting,the extensive industrial application is still limited.Therefore,developing a wide resource of non-precious metal catalysts with low cost and supurior performance is currently the focus of research.Based on the many issues of transition metal cobalt-based catalysts,this work deeply discusses the structure and composition of catalyst and the effect of crystal morphology for the hydrogen evolution activity,furthermore,through the computer calculation,fully explains the relevant reaction mechanism.1.Encapsulating Co₂P@C Core-Shell Nanoparticles in Porous Carbon Sandwich:a Nitrogen and Phosphorus Dual-Doped PH-Universal Electrocatalysts for High-efficient Hydrogen EvolutionThough a facile two-step method of hydrothermal carbonization?HTC?and pyrolysis,a novel,efficient and wide-pH hydrogen evolution catalyst is large and controllable synthesis.Through the computer calculation,the value of?G?H^*?in Co₂P@N,P-C is 0.102 eV,therefore,compared with other catalysts,the target catalysts has the highest hydrogen evolution activity,revealling that the carbon atoms closed to N and P heteroatoms dopants on the shell of Co₂P@N,P-C are the effective active sites for HER catalyst,and Co₂P and N,P dopants synergistically optimize the binding free energy of H*on the active sites,so the performance of catalyst was optimized.In Acidic,alkaline and neutral condition,the initial potential of target catalyst for-13mV,-88 mV and-88 mV,cathode current density for 10 mA cm^-2 corresponding potential only 45,154 mV and 162 mV,Tafel slope is 34,59 and 79 mV dec^-1.2.Porous CoS₂ nanostructures based on ZIF-9 supported on reduced graphene oxide:Favourable electrocatalysis for hydrogen evolution reactionBased on MOF materials have a larger specific surface area and pore structure advantages,this work uses a facile hydrothermal method to prepare a nanocatalyst that porous CoS₂ supported in the thin graphene layers,which have favourable electraocatalytic activity and superior stability.The target catalyst shows excellent HER activity and stability under acid condition,when the cathode current density is 10 mA cm^-2,the overpotential is 180 mV.The Tafel slope is 75 mV dec^-1,the exchange current density reaches 391?A cm^-2.