| Hydrogen energy has become an ideal new energy carrier due to its high efficiency,green,and pollution-free advantages.In present,there are many ways to produce hydrogen,among which hydrogen production technology by the electrolysis of water is the most mature and widely applicable hydrogen production method.However,the anode oxygen evolution reaction of water splitting involves a multi-electron transfer process,which seriously affects the hydrogen production efficiency of water splitting.Therefore,efforts have been devouted to the development of efficient oxygen evolution electrode materials.In this study,two simple processing methods,i.e.powder sintering and arc smelting,were employed to prepare low-cost and high-efficiency Co-Ni-based and Co-Fe-based bimetallic alloy electrode materials,the microstructure and the oxygen evolution performance of alloy electrodes were studied.Afterwards,in order to further optimize the OER catalytic performance of electrode,the electrode material was subjected to cyclic voltammetry aging and acid roughening treatment,the microstructure and oxygen evolution performance of modified alloy electrode were studied.The experiment content and results were summarized as follows:Among the sintered Co-Ni alloy electrode materials,the initial Co1Ni3 electrode exhibited better OER catalytic performance.Afterwards,in order to further improve the catalytic performance of the electrode materials,the sintered Co-Ni alloy electrode was subjected to cyclic voltammetry aging treatment,so that the Fe2+ions in electrolyte was doped intoβ-Ni OOH to form a highly active oxyhydroxide that was more conducive to the OER process.Finally,the Co1Ni3 electrode exhibited excellent OER catalytic performance.At last,the sintered Co-Ni alloy electrode was subjected to acid roughening treatment,and the OER catalytic performance of the electrode material was optimized by changing the specific surface area of electrode,which finally resulted in the Co1Ni1 electrode showing a relatively excellent OER catalytic performance.In the as-cast Co-Ni alloy electrode materials,due to the good synergy between two elements Co and Ni,the Co1Ni1 electrode had better OER catalytic performance.At the same time,the as-cast Co-Ni alloy electrode was also subjected to cyclic voltammetry aging treatment,and the catalytic performance of the Co3Ni1 electrode was improved most significantly.Afterwards,the as-cast Co-Ni alloy electrode was subjected to acid roughening treatment,and the Co1Ni1 electrode showed excellent OER catalytic activity.For the sintered Co-Fe alloy electrode materials,the Co1Fe1 electrode exhibited good OER catalytic performance due to the doping of high-activity Fe elements.Afterwards,the sintered Co-Fe alloy electrode was subjected to acid roughening treatment,and the electrocatalytic activity of the electrode was further optimized by changing the surface roughness of electrode.Among them,the Co1Fe1 electrode showed good OER catalytic performance.For the as-cast Co-Fe alloy electrode materials,the Co1Fe1 electrode material exhibited better OER catalytic performance due to the synergy effect between Co and Fe elements.After the as-cast Co-Fe alloy electrode being subjected to acid roughening treatment,the Co1Fe1 electrode showed better OER catalytic performance. |
