Preparation Of Mxene Supported Catalyst For The Hydrolysis Of Sodium Borohydride By Ultrasonic Electroless Plating

Hydrogen energy is a new energy source with great development potential during the transformation of energy structure.Sodium borohydride,as a metal hydride hydrogen storage material,has become one of the most studied hydrogen storage materials because of its excellent properties.Some non-noble metal catalysts have catalytic activity similar to that of noble metal catalysts and their cost is lower.Which allows them to be used to catalyze the hydrolysis of sodium borohydride on a large scale to produce hydrogen.Combining non-noble metal catalysts with high activity support material can greatly improve their catalytic effect.MXene is a transition metal carbon nitride with an accordion-like structure,which gives it high specific surface area and abundant surface termination group.It has catalytic properties that can be compared with precious metals Pt,and has excellent dehydrogen kinetic properties.A highly catalytically active,low-cost catalyst can be obtained,using ultrasonic chemical plating to bind MXene to non-precious metal particles.Ultrasonic waves can make more metal particles loaded on the surface of the carrier MXene,because as an energy introduction,it can reduce the reaction energy barrier and increase the speed of the reaction.In this paper,on the surface of MXene,the precious metal Co-Ni-P nanocatalyst was supported by two chemical plating methods for catalyzing the hydrolysis of sodium borohydride to produce hydrogen.the main research contents are as follows:The ratio of Co²⁺/Ni²⁺,the type of metal particles,the temperature and time of chemical plating on the hydrogen production rate of the catalyst were studied.To study the hydrolysis and hydrogen production performance of catalysts prepared by ultrasonic chemical plating institutes for the hydrolysis of sodium borohydride,change the sodium borohydride concentration,Na OH concentration,reaction temperature,catalyst concentration in the sodium borohydride hydrogen production solution.The kinetic model of hydrolysis of sodium borohydride by Co-Ni-P/MXene catalyst to produce hydrogen was also studied,and the hydrogen production effect of the catalyst obtained from ultrasonic electroplating and conventional electroplating was studied in comparison.The results show that the Na BH₄ hydrolysis hydrogen production rate is related to the adsorption active site on the surface of the catalyst and the concentration of the reaction product Na BO₂.Kinetic analysis was performed using the zero-order dynamics model,first-order kinetic model and the Langemuir Hincherwood model,and the last model was calculated to be a kinetic model suitable for the catalyst to catalyze sodium borohydride to produce hydrogen,and then the activation energy of 54.56k J/mol was calculated using the Arrhenius equation.At a low concentration of sodium borohydride,the hydrogen production effect of the catalyst obtained by ultrasonic electrolytic plating is no better than that of electrolytic plating without ultrasonic waves.The catalytic cycle performance has also been studied,and the results show that the ultrasonic electroplating catalyst has better cycle performance,and its recycling is used until the sixth time to achieve a catalytic effect comparable to the four times of conventional chemical plating cycle.