\r尹 燕，杜迎梦，焦 魁，杜 青，张国宾

AuthorsHTML:\r尹 燕，杜迎梦，焦 魁，杜 青，张国宾

AuthorsListE:\rYin Yan，Du Yingmeng，Jiao Kui，Du Qing，Zhang Guobin

AuthorsHTMLE:\rYin Yan，Du Yingmeng，Jiao Kui，Du Qing，Zhang Guobin

Unit:\r天津大学机械工程学院，天津 300072

Unit_EngLish:\rSchool of Mechanical Engineering，Tianjin University，Tianjin 300072，China

Abstract_Chinese:\r固体氧化物电解池(SOEC)能利用可再生能源发电电能高效地将水和二氧化碳转化为氢气和一氧化碳等燃料，同时具有高效、低成本、规模易控等优点，被认为是最有前景的储能方式．固体氧化物电解池结构变化会对电解池导电性能产生影响，同时，显著影响电解池内部的气体传输和传热过程，对电解池性能优化十分重要．为探究结构组成对固体氧化物电解池性能的影响，本文建立了一个固体氧化物电解池共电解水和二氧化碳的三维模型，分析加入阳极气体扩散层(AGDL)和金属泡沫流场对电解池极化曲线、过电势和气体分布等的影响．分析结果表明：相比于没有AGDL 的电解池，加入AGDL 可以改善脊下气体在催化层和流道之间的传输，同时增大电子传输横截面积，从而减小可逆电压和欧姆过电势．随着AGDL 厚度增加，电解池性能改善幅度逐渐变小．将普通流场替换成金属泡沫流场可通过改善流场和多孔电极的气体传输，降低电解电压和提高电解效率．增加阳极泡沫厚度可以在一定程度上改善SOEC 性能．而两极均采用金属泡沫流场，由于阳极金属泡沫避免了脊下多孔介质中的氧气积聚，可以进一步提高电解池性能，但性能提升相对较小．

Abstract_English:\rThe solid oxide electrolysis cell (SOEC) can efficiently convert water and carbon dioxide into fuels such as hydrogen and carbon monoxide using electricity generated by renewable energy. It is highly efficient, low-cost, and easy to control, and is considered to be the most promising way to store energy. Structural changes in the SOEC will affect its conductivity; simultaneously, it will significantly affect the gas transmission and heat transfer processes inside the cell, both of which are very important for the optimization of SOEC performance. To investigate the influence of structural composition on the performance of the SOEC, a three-dimensional model of SOEC for the co-electrolysis of water and carbon dioxide was developed. Effects of an anode gas diffusion layer (AGDL) and metal foam flow field on the polarization curves, overpotentials, and gas distribution of the SOEC were analyzed. Results showed that compared to an electrolysis cell without AGDL, the cell with the addition of AGDL can improve the gas transmission under the rib between the catalyst layer and channel, while increasing the cross-sectional area of electron transport, thereby reducing the reversible voltage and ohmic overpotential. As the AGDL thickness increased, the performance of the cell improved and then gradually stabilized. Replacing the traditional flow field with the metal foam flow field on the cathode side decreased the electrolysis voltage and improved electrolysis efficiency by improving gas transmission between flow field and porous electrode. Increasing the thickness of the anode foam improved the SOEC performance to some extent. Because the anode metal foam avoids the accumulation of oxygen in the porous medium under the rib, the performance of the SOEC using metal foam for both sides was further improved; however, the improvement was relatively small.

Keyword_Chinese:固体氧化物电解池；金属泡沫；气体扩散层；共电解；气体分布

Keywords_English:solid oxide electrolysis cell(SOEC)；metal foam；gas diffusion layer；co-electrolysis；gas distribution


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