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固体氧化物电解池能够利用可再生电能将CO2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La0.4Ca0.4Ti0.94Ni0.06O3–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CeO2，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CeO2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) CO2/30%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CO2吸附强化有关。
Abstract：The solid oxide electrolytic cell can use a renewable electricity to convert CO2 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 La0.4Ca0.4Ti0.94Ni0.06O3–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 CeO2 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 800℃,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 by58%.Such an improvement is correlated to the increased amount of surface oxygen vacancies and the strengthened CO2 absorption.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20220906
中图分类号:TQ151;TB33
引用信息:
[1]彭美兰,李智姗,张肖鑫,等.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[J].硅酸盐学报,2023,51(04):1015-1024.DOI:10.14062/j.issn.0454-5648.20220906.
基金信息:
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)
2023-03-11
2023-03-11
2023-03-11