电化学（中英文）2026，Vol.32Issue(7)：14-26,13.DOI:10.61558/2993-074X.3615
原位自组装SmMn2O5-NiMn2O4双相复合阴极的制备及性能研究
Preparation and Performance Study of In-Situ Self-Assembled Biphasic SmMn2O5-NiMn2O4 Composite Cathode
摘要
Abstract
Mullite-structured oxides exhibit excellent oxygen reduction reaction activity,possess a low thermal expansion coef-ficient due to their unique crystal structure,and can eliminate the need for a barrier layer and simplify the preparation process as they contain no alkaline earth elements.Thus,they hold great promise as novel cathode materials for solid ox-ide fuel cells.In this work,a mullite-spinel-structured SmMn2O5-NiMn2O4(SMO-NMO)composite cathode was one-step synthesized via a solid-liquid composite route,and its in-situ self-assembly enabled good compatibility with the electrolyte without any barrier layer.Characterization results showed that the SMO:NMO=5:5(SN55)composite cathode overcame the bottlenecks of single-phase materials-namely,the low conductivity of pure SMO(only 0.035 S·cm-1 at 800 ℃)and the insufficient oxygen reduction reaction activity of pure NMO-through a synergistic effect between the two phases.At 800 ℃,the single cell delivered a peak power density of 1069.82 mW·cm-2,which was 3.24-fold and 1.20-fold higher than that of pure SMO(329.92 mW·cm-2)and NMO(890.20 mW·cm-2),respectively.Under galvanostatic operation at 750 ℃(cur-rent density corresponding to 540 mA·cm-2),the SN55-based cell runs for～150 h with only 1.6%voltage loss,corresponding to a degradation rate of 5.62%/kh,and no defects appeared at the cathode-electrolyte interface.This study provided a new route for designing barrier-layer-free cathodes for solid oxide fuel cells.关键词
固体氧化物燃料电池/阴极/莫来石/无阻挡层/原位复合材料Key words
Solid oxide fuel cell/Cathode/Mullite/Barrier-free/In-situ composite引用本文复制引用
夏能楚,周宇,王琴,张家友,余春,张旸,官万兵,王建新..原位自组装SmMn2O5-NiMn2O4双相复合阴极的制备及性能研究[J].电化学（中英文）,2026,32(7):14-26,13.基金项目
This work was supported by the National Natural Science Foundation of China(Grant No.U24A2062)and Ningbo Key R&D Program Project(grant num-ber 2023Z145). （Grant No.U24A2062）
