Tuning exsolution of nanoparticles in defect engineered layered perovskite oxides for efficient CO_(2) electrolysis  

作　　者：Zhengrong Liu Jun Zhou Yueyue Sun Xiangling Yue Jiaming Yang Lei Fu Qinyuan Deng Hongfei Zhao Chaofan Yin Kai Wu 

机构地区：[1]Center of Nanomaterials for Renewable Energy,State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China [2]School of Chemistry,University of St Andrews,St Andrews,Fife KY169ST,UK

出　　处：《Journal of Energy Chemistry》2023年第9期219-227,共9页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (51877173);the Key R&D Project of Shaanxi Province (2023-YBGY-057);the State Key Laboratory of Electrical Insulation and Power Equipment (EIPE22314, EIPE22306);the Natural Science Basic Research Program of Shaanxi (2023-JC-QN-0483)。

摘　　要：Solid oxide electrolysis cell(SOEC) could be a potential technology to afford chemical storage of renewable electricity by converting water and carbon dioxide.In this work,we present the Ni-doped layered perovskite oxides,(La_(4)Sr_(n-4))_(0.9)Ti_(0.9n)Ni_(0.1n)O_(3n+2) with n=5,8,and 12(LSTNn) for application as catalysts of CO_(2) electrolysis with the exsolution of Ni nanoparticles through a simple in-situ growth method.It is found that the density,size,and distribution of exsolved Ni nanoparticles are determined by the number of n in LSTNn due to the different stack structures of TiO_6 octahedra along the c axis.The Ni doping in LSTNn significantly improved the electrochemical activity by increasing oxygen vacancies,and the Ni metallic nanoparticles afford much more active sites.The results show that LSTNn cathodes can successfully be manipulated the activity by controlling both the n number and Ni exsolution.Among these LSTNn(n=5,8,and 12),LSTN8 renders a higher activity for electrolysis of CO_(2) with a current density of 1.50A cm^(-2)@2.0 V at 800℃ It is clear from these results that the number of n in(La_(4)Sr_(n-4))_(0.9)Ti_(0.9n)Ni_(0.1n)O_(3n+2)with Ni-doping is a key factor in controlling the electrochemical performance and catalytic activity in SOEC.

关 键 词：Layered perovskite oxides In-situ growth SOEC TITANATE 

分 类 号：TM91[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]