Controllable Synthesis Of Transition Metal-based Hybridization Nanotaterials And Their Electrocatalytic Performance

Since the industrial revolution,energy has been urgently needed by human being.As a non-renewable energy source,fossil fuel is confronted with a situation of excessive consumption.Fossil energy issues and its accompanying environmental pollution problems have also aroused widespread concern around the world.According to the above fossil energy crisis and its problems,renewable energy has aroused general interest.As we all know,electrocatalytic splitting of water is one of the most important routes for the clean energy.Precious metal is still the most active electrocatalyst towards catalyzing electrolyzed water due to its high catalytic performance.Regrettably,the massive industrial utilization with precious metal catalyst is greatly limited by its high cost and storage scarcity.Therefore,it is significant to develop new electrocatalysts towards oxygen evolution reaction?OER?,hydrogen evolution reaction?HER?and oxygen reduction reaction?ORR?for the storage and development of clean energy.In response to the above-mentioned problems,this article prepared a relatively inexpensive transition metal,we have produced nanomaterial with excellent performance through continuous optimization and improvement of the synthesis method and reaction conditions.The oxygen evolution reaction?OER?,hydrogen evolution reaction?HER?and oxygen reduction reaction?ORR?were model reactions in this article,we conducted a systematic characterization analysis of the electrocatalyst.The main research details of this paper are as follows:?1?Firstly,W-Ru/NF was synthesized by solvothermal method.Then,the W-Ru/NiP₂ electrocatalyst was obtained by phosphating process.The hydrogen evolution reaction?HER?was used as a model reaction to study the effect of metal doping on the electrocatalyst performance.The results proved that the enhanced electrocatalytic performance can be attributed to the synergistic effect of the W and Ru elements,the unique ultrathin nanosheets structure,more active crystal faces are exposed during the catalytic process,and the amorphous carbon layer which accelerated electrons transmission.Therefore,the W-Ru/NiP₂ catalyst exhibits excellent hydrogen evolution reaction?HER?performance.?2?Firstly,the precursor?CoFe₂O₄?was prepared by solvothermal method,then the precursor was further carbonized at high temperature to obtain CoFe-CNT nanomaterial,finally,the CoFe-CNT was reduced under H₂ atmosphere to obtain CoFe-CNT-H electrocatalysts.Oxygen reduction reaction was treated as the model reaction,experimental conditions such as reduction time and the amount of polyacrylamide were focused on to investigate its effect on the performance of electrocatalysts.The results showed that the chemical environment around Co and Fe in the catalyst was changed after the hydrogen reduction process,more active sites were exposed for the oxygen reduction reaction,the synergistic effect of the Co and Fe elements improved the performance of the catalyst.In addition,carbon was used as the main structure of the electrocatalyst,which was more conducive to the transmission of electron.Therefore,the CoFe-CNT-H electrocatalyst exhibits excellent electrocatalytic activity.?3?Firstly,NF@Co?OH?₂ was synthesized by solvothermal method.Then,Co?OH?₂ was oxidized to Co₃O₄,finally,a layer of FeOOH was deposited on the surface of NF@Co₃O₄ by the electrodeposition,that was the composite material:NF@Co₃O₄@FeOOH.Oxygen evolution reaction was treated as the model reactions,the synergistic effect between metal ions was focused on to discuss the effect on the performance of the electrocatalysts.The results indicataed that the synergistic effect between Co³⁺and Fe³⁺boosted the performance of the catalysts,more active crystal faces are exposed due to the FeOOH nanosheet structure,and it was effective for the NF to improve the stability as well as the conductivity of the electrocatalysts.Therefore,NF@Co₃O₄@FeOOH exhibits excellent performance and electrochemical stability.