二维mxene衍生物对naalh4体系吸放氢性能的影响无机化学专业论文.docxVIP

AbstractLight Abstract Light metal complex hydrides are considered as potential hydrogen storage materials because of the high theoretical hydrogen storage capacity compared、析m others．However,their practical application is limited due to high operating temperatures，sluggish kinetics and strict testing conditions about dehydrogenation and hydrogenation．Therefore，as solid hydrogen storage material，there are many problems to be further solved．The addition of catalyst is one of the most effective method to improve the ab／desorption kinetic of NaAlH4．The derivatives (MXene-Ti02 and TiC)of Titanium based two dimensional transition metal carbide (MXene)are an ideal additive to improve the hydrogen storage properties of NaAlH4 because of its controllable microstructure．In this paper,the catalyst behavior of MXene·-Ti02 and Ti02·-C prepared by solvothermalalchohysis method on NaAlI-h hydrogen storage Was systematically studied． Firstly,the hydrogen evolution properties of NaAlH4+X wt％MXene-Zi02伍= 0，5，1 0 and 1 0)were studied．The initial dehydriding temperature and hydrogen desorption capacity gradually decreased with increasing the amount of additive．The best comprehensive performance of hydrogenation storage Was obtained when x value Was 1 0．The hydrogen capacity of NaAlI-h+1 0 wt％MXene—Ti02 reached to 1．25 wt％within 100 min at 100*C，and it released 4．89 wt％hydrogen within 100 min at 1 40。C．At the same time，the good cycle stability within 5 cycles Was observed． Comparing谢m MXene，A—Zi02，R-Ti02，Ti203，TiO and TIC，MXene-Ti02 exhibits better catalytic effect on the hydrogen desorption of NaAlH4 due to uniform dispersion and the synergistic effect of TiC and TiH2． Ti02·C composite谢Ⅱ1 different microstructure，phase composition and phase abundance were prepared by solvothermalalchohysis， and hydrogen storage performances of NaAlH4+1 0 wt％Zi02-C were investigated．The efficiency of Fs-Ao．9Ro．ITC is the best．Hydrogen desorption ofthe NaAlH4+10 wt％Ti02一C IV 万方数据 samples samples were e