Abstract
Herein,the successful preparation of a single-atom catalyst V-N-C using vanadium-doped zeolitic imi-dazolate framework(ZIF)-8 as a precursor is reported.The experimental results showed that the V-N-C had a good promoting effect on the hydrogen storage performance of MgH2,and the optimal addition amount of V-N-C was 10 wt％.The hydrogenation and dehydrogenation apparent activation energies of 10 wt％V-N-C-catalyzed MgH2 were reduced by 44.9 and 53.5 kJ·mol-1,respectively,compared to those of additive-free MgH2.The 10 wt％V-N-C-catalyzed MgH2 could reabsorb 5.92 wt％of hydro-gen in 50 min at 150 ℃,with a capacity retention rate of 99.1％after 30 cycles of hydrogen absorption and des-orption.Mechanism analysis showed that V-N-C was partially transformed into VN and metallic V when it was milled with MgH2;the in-situ-formed VN and metallic V played an important role in improving the hydrogen storage performance of MgH2.This approach provides a potential solution for obtaining high-performance Mg-based hydro-gen storage materials through synergistic interactions between V,N and C.
基金项目
国家自然科学基金(52261038)
国家自然科学基金(51861002)
Nanning Excellent Young Talents Cultivation Project of Scientific and Technological Innovation and Entrepreneurship(RC20220102)
NETL
NSTL
万方数据