H_2 generation kinetics/thermodynamics and hydrolysis mechanism of high-performance La-doped Mg-Ni alloys in Na Cl solution——A large-scale and quick strategy to get hydrogen

作     者：Xiaojiang Hou Hongchang Shi Lu Yang Kaiming Hou Yi Wang Lei Feng Guoquan Suo Xiaohui Ye Li Zhang Yanling Yang Xiaojiang Hou;Hongchang Shi;Lu Yang;Kaiming Hou;Yi Wang;Lei Feng;Guoquan Suo;Xiaohui Ye;Li Zhang;Yanling Yang

作者机构：School of Material Science and EngineeringShaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi'an 710021China State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi'an 710072China 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2021年第9卷第3期

页      面：1068-1083页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.51704188,51702199,61705125,51802181) the State Key Laboratory of Solidification Processing in NWPU(Grant No.SKLSP201809) Natural Science Foundation of Shaanxi Province(Grant No.2019JQ-099) Research Starting Foundation from Shaanxi University of Science and Technology(Grant No.2016GBJ-04) the financial support of China Scholarship Council(Grant No.201808610089) 

主　　题：H_(2)generation La-doped Mg-Ni alloys Kinetics Thermodynamics Hydrolysis mechanism 

摘      要：In this work,La-doped Mg-Ni multiphase alloys were prepared by resistance melting furnace(RMF)and then modified by high-energy ball milling(HEBM).The hydrolysis H_(2) generation kinetics/thermodynamics of prepared alloys in Na Cl solutions have been investigated with the help of nonlinear and linear fitting by Avrami-Erofeev and Arrhenius *** the microstructure information before and after hydrolysis and thermodynamics fitting results,the hydrolysis H_(2) generation mechanism based on nucleation&growth has been *** final H_(2) generation capacities of 0La,5La,10La and 15 La alloys are 677,653,641 and 770 m L·g^(-1)H_(2) in 240 min at291 K,***,the final H_(2) generation capacities of HEBM 0La,5La,10La and 15 La alloys are 632,824,611 and 653 m L·g^(-1)H_(2) in 20 min at 291 K,*** as-cast 15La alloy and HEMB 5La alloy present the best H_(2) production rates and final H_(2) production capacities,especially the HEBM 5La can rapidly achieve high H_(2) generation capacity(670 and 824 m L·g^(-1)H_(2) )at low temperature(291 K)within short time(5 and 20 min).The difference between the H_(2) generation capacities is mainly originated from the initial nucleation rate of Mg(OH)_(2) and the subsequent processes affected by the microstructures and phase compositions of the hydrolysis *** low initial nucleation rate and fully growth of Mg(OH)_(2) nucleus are the premise of high H_(2) generation capacity due to the hydrolysis H_(2) generation process consisted by the nucleation,growth and contacting of Mg(OH)_(2) *** utilization H_(2) by designing solid state H_(2) generators using optimized Mg-based alloys is expected to be a feasible H_(2) generation strategy at the moment.