原位析出制备固体氧化物电解池的"氧化铈–金属–钙钛矿"复合阴极材料  

In-situ Exsolution of Cerium Oxide-Metal-Perovskite Composite Cathode for Solid Oxide Electrolysis Cell

作　　者：彭美兰 李智姗 张肖鑫 张一凡 宁嘉瑞 孙毅飞 PENG Meilan;LI Zhishan;ZHANG Xiaoxin;ZHANG Yifan;NING Jiarui;SUN Yifei(College of Energy,Xiamen University,Xiamen 363102,Fujian,China;Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM),Xiamen 361005,Fujian,China)

机构地区：[1]厦门大学能源学院,福建厦门363102 [2]福建省能源材料科学与技术创新实验室(IKKEM),福建厦门361005

出　　处：《硅酸盐学报》2023年第4期1015-1024,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(22102135,22272136);厦门大学“中央高校基本科研业务费”专项资金(20720220119);福建省科技计划项目(2022L3077)。

摘　　要：固体氧化物电解池能够利用可再生电能将CO_(2)转化为CO等储存,但其阴极材料仍面临活性位易烧结和积碳等问题.通过原位析出策略在A位缺陷钙钛矿阴极材料La_(0.4)Ca_(0.4)Ti_(0.94)Ni_(0.06)O_(3–δ)表面构筑金属Ni纳米颗粒,并优化不同的合成手段(掺杂、浸渍、混合)引入CeO_(2),构筑了"氧化铈–金属–钙钛矿"三相复合阴极.结果表明:机械混合CeO_(2)对阴极的抗积碳性能与电化学性能的提升最为显著:在800℃,70%(体积分数)CO_(2)/30%CO,1.4 V电解电压下,电流密度提高3倍,衰减速率降低58%,该改性结果与其表面氧空位浓度增加及CO_(2)吸附强化有关.The solid oxide electrolytic cell can use a renewable electricity to convert CO_(2)into CO for storage.However,it still suffers from the sintering of reactive sites and carbon deposition at cathode.In this work,A-site deficient La_(0.4)Ca_(0.4)Ti_(0.94)Ni_(0.06)O_(3-δ)perovskite cathode with the decoration of a large number of exsolved Ni nanoparticles was prepared by an in-situ exsolution method.Also,a promoter of CeO_(2)was introduced into the system via different synthetic methods(i.e.,doping,impregnation and mechanical mixing)to construct a"cerium oxide-metal-perovskite"three-phase composite cathode material.The results show that the carbon deposition resistance and electrochemical performance of the mechanical mixed modified materials can be improved at 800C,70%(in volume)CO2/30%CO and 1.4 V electrolytic voltage.The current density is increased by 3 times and the voltage decay rate is decreased by 58%.Such an improvement is correlated to the increased amount of surface oxygen vacancies and the strengthened CO_(2)absorption.

关 键 词：固体氧化物电解池 二氧化碳转化 原位析出 钙钛矿阴极 二氧化铈修饰 抗积碳 

分 类 号：TM911.4[电气工程—电力电子与电力传动]