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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Hydrogen Absorption Kinetics of the Transition-Metal-Chloride-Enhanced NaAlH4 System
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Hydrogen Absorption Kinetics of the Transition-Metal-Chloride-Enhanced NaAlH4 System

机译：过渡金属氯化物增强的NaAlH4系统的氢吸收动力学

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摘要

This study elucidates the role of transition metal (TM) additives in enhancing hydrogen (H) reversibility and hydrogenation kinetics for the NaAlH4 system. The isothermal hydrogen absorption kinetics of the planetary milled (PM) NaAlH4 + xTMCl_n(TM row 1 = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu; row 2 = Zn, Y, 2r, Nb, Mo, Ru, Rh Pd; row 3 = Pt; 2 < n < 5) and cryo-milled (CM) NaAlH4 + xTMCl_n (TM row 1 = Ti, V, Cr, Fe, Co, Ni, Cu; 2 < n < 3) systems have been measured at 140 °C and 150 bar system pressure. The variation in hydrogenation kinetics across the TM series for NaAlH4 + xTMCl_n is strongly dependent on the TM species and additive level, milling technique, and the type, structure, and morphological arrangement of nanoscopic Al_(1-x)TM_x phases that are embedded on the NaAlH4 surface. In the most interesting case, the surface-embedded A_(1-x)Ti_x phases in the TiCl3-enhanced NaAlH4 system perform a dual catalytic function, where the outer Al_(1-x)Ti_x surface performs dissociation/recombination of molecular H2 and the inner Al_(1-x)Ti_x surface allows the distortion of a minor number of Al-H bonds from AlH4~- tetrahedra in the vicinity of the subsurface Al_(1-x)T_x/NaAlH4 interface. The density of Ti atoms in the subsurface interface (which is Al:Ti composition- and H cychng temperature-dependent) shows the strongest effects on hydrogenation kinetics.
机译：这项研究阐明了过渡金属（TM）添加剂在增强NaAlH4系统的氢（H）可逆性和氢化动力学方面的作用。行星研磨（PM）NaAlH4 + xTMCl_n（TM第1行= Sc，Ti，V，Cr，Mn，Fe，Co，Ni，Cu的等温氢吸收动力学;第2行= Zn，Y，2r，Nb，Mo ，Ru，Rh Pd;第3行= Pt; 2

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