Abstract
The facile construction of nanoscale NbHx supported by Ti3C2(NbHx@Ti3C2)was achieved using facile ball milling strategy to improve the hydrogen des-orption kinetics and reversibility of magnesium borohy-dride(Mg(BH4)2).The doping of 30 wt％NbHx@Ti3C2 catalyst reduced the onset dehydrogenation temperature of Mg(BH4)2 to 71.2 ℃.Additionally,the Mg(BH4)2+30 NbHx@Ti3C2 composite achieved remarkable hydrogen release of over 9.2 wt％at a temperature as low as 230 ℃,indicating unexpected dehydrogenation kinetics.Moreover,the reversibility of NbHx@Ti3C2 doped Mg(BH4)2 was retained to more than 4.2 wt％after four cycles,which was increased by 68％compared to that of undoped Mg(BH4)2.The strong catalysis of NbHx@Ti3C2 catalyst could be attributed to the synergistic effect of NbHx and Ti3C2 in hydrogen spillover and diffusion.NbHx acted as a"hydrogen pump"for effective hydrogen spillover,while Ti3C2 created numerous diffusion channels for hydrogen dissolution and provided the active catalytic site to facili-tate the re/dehydrogenation of Mg(BH4)2.
基金项目
National Natural Science Foundation of China(52201255)
Natural Science Foundation of Jiangsu Province(BK20210884)
Innovation and Entrepreneurship Program of Jiangsu Province(JSSCBS20211007)
NETL
NSTL
万方数据