Study On The Preparation And Electrocatalytic Performance Of Nickel-based Binary Composite Materials

Hydrogen is an ideal clean energy in the scope of the concept,which can replace petroleum as the main energy carrier in the future.Therefore,hydrogen energy is a planning concept with both economic and practical significance.Hydrogen production by water splitting can be coupled with renewable energy sources such as solar energy and wind energy to realize the closed loop of the hydrogen cycle economy system.It is an efficient,environmentally friendly and sustainable hydrogen production strategy.The water splitting reaction consists of two half reactions(HER/OER).The HER catalyst currently recognized in the market is the noble metal Pt;the most prominent OER electrocatalyst is the Ir/Ru-based oxide.However,precious metals are not conducive to large-scale production and commercialization due to their rarity and high cost.In recent years,the scientific and industrial circles have devoted themselves to seeking cheap,excellent performance,and stable reaction catalysts to replace precious metals and their oxides.Although the current research results on the preparation and modification of catalytic materials and other related processes and the analysis of catalytic mechanisms have shown initial clues,the current situation is that the low-cost,high-performance catalysts invented in laboratories are far from entering actual production on the market.There are still many difficulties to be solved in the realization of the final hydrogen energy cycle.The development and preparation of low-cost,high-efficiency,and stable catalysts is still a scientific problem that needs to be solved urgently.Based on the above situation,we take transition metals as the research object and carry out the following work:The Ni Co SP composite electrocatalyst was successfully prepared by using the foamed metal as the substrate,the hydrothermal reaction in-situ growth method combined with the atmosphere calcination method,and the systematic electrochemical test was carried out.The test results show that the Ni Co SP composite electrocatalyst has an overpotential of 93 m V under acidic conditions and 106 m V under alkaline conditions when the prepared Ni Co SP composite electrocatalyst is 10 m A cm^-2;and it also has excellent cycle stability.Experiments have found that Ni Co mixed hydroxide promotes electrochemical performance due to the synergy between different cations compared to a single element;the worse the anion electronegativity,the stronger the catalytic performance;the synergy between S/P produces more The interface effect also promotes the catalytic performance of the material.The aerophobicity of the material surface also ensures the overall electrocatalytic performance of the material.Ni Fe-LDH composite material was prepared by in-situ growth with foam metal as the substrate through hydrothermal reaction,and its OER performance under alkaline conditions was tested in detail;At the same time,the influence of different hydrothermal parameters,the ratio of nickel and iron on the structure,morphology and electrocatalytic performance of the synthesized Ni Fe-LDH composite material and the synergistic effect of Ni-Fe ions on the electrocatalysis of the enhanced alkaline OER reaction were also studied.Performance reasons.