Design And Catalytic Properties Of Noble-metal Free Electrocatalysts For Water Oxidation

The ever-worsen energy and environmental crises have stimulated intensive research on the development of clean and renewable energy carriers to replace the diminishing and environmentally unfriendly fossil fuels.Electrochemical water splitting with hydrogen evolution reaction?HER?at cathode and oxygen evolution reaction?OER?at anode is a promising and viable strategy to generate hydrogen,benefiting from abundant water resources on earth.To date,IrO2 and RuO2 catalysts have the highest activity toward the OER,but their high cost and rareness limits its widespread application.Transition-metals as earth-abundant and environmentally friendly materials have been designed to a number of eficient electrocatalysts active for water splitting during the past years.NiSe-based electrocatalysts with unique nanostructures and desired material optimization have been found to exhibit catalytic performance in water electrolysis process.First,we used a simple hydrothermal reaction to prepare the Co-doped NiSe NWs/NF with highly electrocatalytic performance for OER.Second,we used report a highly active NiSe@CoOOH NWs/NF core-shell structure fabricated using a facile approach for the first time.Co-doped NiSe nanowires supported on nickel foam?NF?have been successfully synthesized by the NiSe NWs/NF as precursor template in a facile cation exchange approach.The Co-doped NiSe Nanowires on nickel foam?Co-doped NiSe NWs/NF?has been confirmed by XRD,SEM images,XPS,EDX and HRTEM.The electrochemical performances of Co-doped NiSe NWs/NF for oxygen evolution reaction?OER?have been investigated.We show that the as-obtained nanomaterials exhibit significantly enhanced activated activity compared to pure NiSeNWs/NF toward oxygen evolution reaction?OER?.The Co-doped NiSe NWs/NF demonstrates dramatically enhanced OER activity with much lower overpotential of 283 mV at 100 mA cm^-2 than those of other NiSe-based electrocatalysts.NiSe@CoOOH nanowires supported on nickel foam?NiSe@CoOOH NWs/NF?have been successfully synthesized by a facile approach for the first time.The NiSe@CoOOH NWs/NF has been confirmed by XRD,SEM images,XPS,EDX and HRTEM.The NiSe@CoOOH NWs/NF as a nonprecious-metal catalyst,which show high catalytic performance for oxygen evolution reaction.We show that the as-obtained nanomaterials exhibit significantly enhanced activated activity compared to pure NiSe NWs/NF toward oxygen evolution reaction?OER?.The NiSe@CoOOH NWs/NF core-shell structure demonstrates dramatically enhanced OER activity with much lower overpotential of 294 mV at 100 mA cm^-2 than those of other NiSe-based electrocatalysts.