文献类型：期刊文献

英文题名：Unveiling anodic reaction-diffusion coupling in metal-supported SOFC single cells under direct-ammonia operation via quantitative DRT and CFD analysis

作者：Xu, Kai[1];Zhang, Xiaoqing[2];Chen, Youpeng[3];Ma, Peng[3];Zhang, Zhaohuan[4];Ma, Xiao[4];Shuai, Shijin[1]

机构：[1]Tsinghua Univ, Inst Aeroengine, Beijing 100084, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[3]Beijing Swift New Energy Technol Co Ltd, Beijing 100096, Peoples R China;[4]Tsinghua Univ, Sch Vehicle & Mobil, Beijing 100084, Peoples R China

年份：2026

卷号：538

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20261820608973);WOS:【SCI-EXPANDED(收录号:WOS:001759724500001)】；

基金：This research is supported by National Key Research and Development Program of China (Grant No. 2021YFB2500400) , China Post-doctoral Science Foundation (Grant No. 2023TQ0170, 2024 M751668) , and National Natural 593 Science Foundation of China (Grant No.52576125)

语种：英文

外文关键词：Metal-supported direct-ammonia SOFC; Mass transfer; DRT analysis

摘要：The electrochemical performance and impedance response of metal-supported SOFC (MSC) single cells under direct-ammonia operation were investigated by combining fuel-composition/current-density variation, electrochemical impedance spectroscopy, quantitative distribution of relaxation times (DRT) analysis, and CFD simulation. Two anode-related Gerischer-like contributions were resolved from the DRT spectra. The low-frequency process was interpreted as associated with coupled gas transport, hydrogen generation/consumption, and electrochemical reaction in the anode, whereas the mid-frequency process was interpreted as a more local interfacial process related to electrochemical oxidation and oxygen-vacancy transport. Experimental results together with CFD simulations supported the presence of rib/channel-induced gas-composition non-uniformity in the anode active layer, arising from internal ammonia decomposition, restricted gas exchange, and lateral diffusion. Quantitative analysis further suggested that the P1 contribution scales with the degree of hydrogen non-uniformity, while ammonia-containing feeds were associated with a 60%-90% increase in the effective chemical capacitance inferred from P2. These results provide an experimentally and numerically supported interpretation of coupled ammonia decomposition, gas transport, and electrochemical processes in direct-ammonia MSCs, and demonstrate the usefulness of EIS-DRT analysis for diagnosing coupled transport and reaction processes in internally reforming cell designs.