Tuning the electronic conductance of REH_(x)(RE=Nd,Ce,Pr)by structural deformation  

作　　者：Shangshang Wang Weijin Zhang Jirong Cui Shukun Liu Hong Wen Jianping Guo Teng He Hujun Cao Ping Chen 

机构地区：[1]Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]State Key Laboratory of Catalysis,Chinese Academy of Sciences,Dalian 116023,Liaoning,China

出　　处：《Journal of Energy Chemistry》2024年第8期440-445,I0010,共7页能源化学（英文版）

基　　金：supported by the National Key Research and Development Program of China(2021YFB4000602);the National Natural Science Foundation of China(21988101,22279130,21633011);the Dalian Science and Technology Innovation Fund(2023RJ016);the Liaoning Revitalization Talents Program(x LYC2002076)。

摘　　要：Hydride ion(H-)conductors have drawn much attention due to their potential applications in hydrideion-based devices.Rare earth metal hydrides(REH_(x))have fast H-conduction which,unfortunately,is accompanied by detrimental electron conduction preventing their application as ion conductors.Here,REH_(x)(RE=Nd,Ce,and Pr)with varied grain sizes,rich grain boundaries,and defects have been prepared by ball milling and subsequent sintering.The electronic conductivity of the ball-milled REH_(x)samples can be reduced by 2-4 orders of magnitude compared with the non-ball-milled samples.The relationship of electron conduction and miscrostructures in REH_(x)is studied and discussed based on experimental data and previously-proposed classical and quantum theories.The H-conductivity of all REH_(x)is about 10^(-4)to 10^(-3)S cm^(-1)at room temperature,showing promise for the development of H-conductors and their applications in clean energy storage and conversion.

关 键 词：Hydride ion conduction Electron conduction Nanosized grain Crystal defect Electron scattering 

分 类 号：TM91[电气工程—电力电子与电力传动]