Improved hydrogen storage kinetics of MgH_(2) using TiFe_(0.92)Mn_(0.04)Co_(0.04) with in-situ generated α-Fe as catalyst

作     者：Zefeng Li Yangfan Lu Jingfeng Wang Yu'an Chen Qian Li Fushen Pan 

作者机构：College of Materials Science and EngineeringNational Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing400044PR China National Key Laboratory of Advanced Casting TechnologiesChongqing UniversityChongqing400044PR China Chongqing Institute of New Energy Storage Materials and EquipmentChongqing401135PR China 

出 版 物：《Materials Reports(Energy)》 (材料导报（能源）（英文）)

年 卷 期：2024年第4卷第1期

页      面：95-103页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：supported by The National Key Research and Development Program of China(2023YFB3809100) the National Natural Science Foundation of China(U23A200722) the Fundamental Research Funds for the Central Universities(2023CDJXY-016) 

主　　题：Hydrogen storage materials Magnesium De/hydrogenation kinetics Catalyst 

摘      要：While TiFe alloy has recently attracted attention as the efficient catalyst to enhance de/hydrogenation rates of Mg/MgH_(2),the difficulty of its activation characteristics has hindered further improvement of reaction ***,we report that the TiFe_(0.92)Mn_(0.04)Co_(0.04) catalyst can overcome the abovementioned *** synthesized MgH_(2)-30 wt% TiFe_(0.92)Mn_(0.04)Co_(0.04) can release 4.5 wt%of hydrogen in 16 min at 250℃,three times as fast as MgH_(2).The activation energy of dehydrogenation was as low as 84.6 kJ mol^(-1),which is 46.8%reduced from pure MgH_(2).No clear degradation of reaction rates and hydrogen storage capacity was observed for at least 30 *** studies reveal that TiFe_(0.92)Mn_(0.04)Co_(0.04) partially decomposes to in-situ generatedα-Fe particles dispersed on TiFe_(0.92)Mn_(0.04)Co_(0.04).The presence ofα-Fe reduces the formation of an oxide layer on TiFe_(0.92)Mn_(0.04)Co_(0.04),enabling the activation *** the same time,the hydrogen incorporation capabilities of TiFe_(0.92)Mn_(0.04)Co_(0.04) can provide more hydrogen diffusion paths,which promote hydrogen dissociation and *** discoveries demonstrate the advanced nature and importance of combining the in-situ generatedα-Fe with TiFe_(0.92)Mn_(0.04)Co_(0.04).It provides a new strategy for designing highly efficient and stable catalysts for Mg-based hydrogen storage materials.