关键词: 储氢材料, 氨硼烷水解, 金属有机骨架衍生材料, CoNi合金

Abstract: In order to improve the performance of ammonia borane (AB) hydrolysis for hydrogen production under mild conditions,a catalyst with both high activity and high stability was developed.Firstly, the zeolitic imidazolate frameworks material CoNi-ZIF (a type of metal-organic frameworks material) was prepared by directly stirring the reaction solution at normal temperature and pressure, and then the CoNi-ZIF precursor was calcined at high temperature to prepare Co_xNi_1-x/NC catalyst (where x represents the molar fraction of Co atoms, 0＜x＜1) supported on nitrogen-doped porous carbon (NC). The structure and morphology of  Co_xNi_1-x/NC catalyst were characterized by scanning spectroscopy microscopy,transmission electron microscopy, and X-ray photoelectron spectroscopy, and the catalytic performance of the catalyst for hydrogen production from hydrolysis of AB was investigated by changing the metal ratio of Co/Ni,the amount of catalyst, the concentration of AB, reaction temperature and other conditions. The results showed that Co_0.6Ni_0.4/NC with a Co/Ni molar ratio of 6∶4 had a larger specific surface area and the best catalytic activity, and the time of AB complete hydrolysis was the shortest at 298 K.The TOF value of Co_0.6Ni_0.4/NC catalyzing AB hydrolysis for hydrogen production was 1832.79 h^-1, and the activation energy of the reaction was 64.81kJ/mol. After 10 cycles of use, the rate of hydrogen production by catalyzing the complete hydrolysis of AB hadalmost no change, and the catalytic activity was still good.

Key words: hydrogen storage material, ammonia borane hydrolysis, metal-organic frameworks derived material, Co/Ni alloy