硬模板法可控构筑SOEC钙钛矿阴极及H2O/CO2共电解制合成气研究

固体氧化物电解池（SOEC）共电解H2O/CO2可有效缓解电厂“谷电”浪费的现状同时推动碳中和目标的实现。共电解过程中SOEC阴极侧“安全气”的使用，既增加过程成本和复杂度，又限制产物比率范围。本申请项目拟在前期工作基础上，利用SOEC共电解H2O/CO2，联产合成气和氧气，并从宏观和微观层面研究：（1）硬模板法可控构筑B位掺杂型La0.5Sr0.5FeO3基阴极材料，调变阴极结构和微观形貌，建立材料的构效关系；（2）借助原位谱学表征、电化学测试技术和密度泛函理论计算，明晰气体吸附特性和反应中间活性物种，阐释B位金属元素间的协同作用机制，建立微观反应路径，揭示阴极共电解反应机理；（3）基于实验和理论分析，调控优化阴极材料，构建SOEC共电解体系，探明运行工况对产物分布和各评价指标的影响。本项目的成功实施可为高效稳定的高温共电解H2O/CO2阴极材料的开发提供理论支撑，助力电厂绿色低碳发展。

The solid oxide electrolysis cell (SOEC) co-electrolysis of H2O/CO2 can effectively alleviate the status quo of "valley power" waste in power plants and promote the realization of carbon neutrality goals. The current use of "safety gas" on the cathode side of SOEC not only increases the cost and complexity of the process, but also limits the range of product ratios. The project aims to use SOEC co-electrolysis of H2O/CO2 to co-produce syngas and oxygen. Based on our previous work, we intends to study this project from the macro and micro levels: (1) The hard template method is used to controllably construct the B-site doped La0.5Sr0.5FeO3-based cathode material, and through adjusting the cathode structure and micro morphology to establish the structure-effect relationship of the material; (2) With the help of in-situ spectroscopy, electrochemical testing technology and density functional theory calculations, the gas adsorption characteristics and the reaction intermediate active species are clarified, the synergistic mechanism of B-site metal elements is explained, micro-reaction pathways is established, and the mechanism of cathode co-electrolysis is revealed; (3) Based on experimental and theoretical analysis, the construction of SOEC co-electrolysis system is optimized, and the impact of working conditions on product distribution and various evaluation indicators are investigated. The successful implementation of this project can provide theoretical support for the development of efficient and stable high-temperature co-electrolysis H2O/CO2 cathode materials, and contribute to the green and low-carbon development of power plants.