氢电极支撑可逆固体氧化物电池性能及电化学不对称性优化  

Performance and Electrochemical Asymmetry Optimization of Hydrogen Electrode Supported Reversible Solid Oxide Cell

作　　者：韩倩雯 朱腾龙 吕秋秋 俞马宏[1] 钟秦[1] Qianwen Han;Tenglong Zhu;Qiuqiu Lü;Mahong Yu;Qin Zhong(School of Chemistry and Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China.)

机构地区：[1]南京理工大学化学与化工学院,南京210094

出　　处：《物理化学学报》2025年第1期90-96,共7页Acta Physico-Chimica Sinica

基　　金：江苏省重点研发计划(BE2022029)资助项目。

摘　　要：Ni-YSZ(镍-氧化钇稳定的氧化锆)氢电极支撑固体氧化物电池(SOC)在可逆运行模式下(R-SOC)普遍存在电化学不对称性现象。本文通过实验研究发现,氢电极扩散阻抗及电解质欧姆阻抗同时是R-SOC性能及不对称性的显著影响因素。研究结果显示,采用大孔氢电极和薄膜隔离层显著提升了R-SOC性能并减小了不对称性,在750℃、50%H_(2)O和0.3 V偏压工况下,单电池的发电及电解电流密度分别达到了0.752和0.635 A∙cm^(−2),电流密度不对称度Δj仅为0.117 A∙cm^(−2)。研究结果对于高性能氢电极支撑SOC单电池的结构设计、制备和可逆运行具有重要的参考价值。Solid oxide cell(SOC)is a typical multi-layer thin film ceramic device consisting of oxygen electrodes,electrolytes,and hydrogen electrodes.The currently widely used structure is a single cell supported by a Ni-YSZ(Nickel-Yttria Stabilized Zirconia)hydrogen electrode,with YSZ(Yttria Stabilized Zirconia)serving as the electrolyte.This configuration achieves electrolyte filmization,while also reducing the operating temperature of the cell.However,it introduces significant diffusion impedance within the hydrogen electrode,which is considered the main reason for the electrochemical asymmetry in reversible solid oxide cell(R-SOC).This study prepared hydrogen electrodes with varying porosity and investigated the impact of diffusion impedance of hydrogen electrodes on R-SOC asymmetry.On this basis,hydrothermal in situ growth technology was employed to prepare ultra-thin and dense GDC(Gd_(2)O_(3)doped CeO_(2))barrier layers,compared with conventional screen-printed barrier layers to explore the effect of electrolyte ohmic impedance on electrochemical asymmetry.Experimental findings revealed that the electrolyte ohmic impedance is also a significant factor affecting the electrochemical asymmetry of reversible SOC,and the synergistic mechanism of the diffusion impedance of hydrogen electrodes and the ohmic impedance of thin film electrolytes on this asymmetry was elucidated.The experimental results show that increasing the hydrogen electrode porosity and reducing the electrolyte ohmic impedance can both enhance the R-SOC performance,particularly improving SOEC electrolysis performance,and both have the effect of reducing asymmetry.At 750℃,50%H2O,and±0.3 V bias conditions,the single cell with a large-pore hydrogen electrode and a thin film barrier layer exhibited a discharge current density of 0.752 A∙cm^(−2)and an electrolysis current density of 0.635 A∙cm−2.Compared to the single cell with a small pore hydrogen electrode and an ordinary screen-printed barrier layer,the discharge and electrolysis performance of

关 键 词：可逆固体氧化物电池 电化学不对称性 氢电极扩散阻抗 欧姆阻抗 薄膜隔离层 

分 类 号：O646[理学—物理化学]