固体氧化物燃料电池阴极的等离子喷涂制备及结构调控

Preparation and Structure Control of Solid Oxide Fuel Cell Cathode by Plasma Spraying

摘要:

固体氧化物燃料电池（SOFC）作为一种高效、环保的发电装置备受关注，金属支撑型SOFC因高鲁棒性和优异性价比而极具发展潜力。目前金属支撑型SOFC的制备方法（如湿化学法和镀膜技术），仍存在需高温烧结、效率低和工艺复杂等问题。大气等离子喷涂（APS）技术因具备成本低、效率高、对基体热输入少等特点，适合高效制备金属支撑型SOFC。本文采用APS技术制备金属支撑型SOFC，重点探究了不同喷涂参数在立方钙钛矿锶钴铁氧体（LSCF）阴极结构的调控作用。通过对APS制备的单粒子形貌进行表征，阐明了阴极沉积的机理，同时揭示了微观结构对电池性能的影响。研究结果表明：在14 kW条件下，采用APS制备的多孔阴极涂层，由熔融粒子和部分半熔化粒子构成，具有最佳电催化性能；在800 ℃下，电池整体的极化电阻仅为0.12 Ω·cm²、输出峰功率达到1 074 mW·cm^-2，表现出良好的输出能力。

Abstract:

Solid oxide fuel cell （SOFC） has garnered significant attention as efficient and environmentally friendly power generation devices. Among them， metal-supported SOFCs exhibit tremendous development potential due to their high robustness， reliability and cost-effectiveness. However， the current methods for fabricating metal-supported SOFCs， such as wet chemical processes and film technologies， still face challenges， including high-temperature sintering， low molding efficiency， and complexity. Plasma spraying， with its capability for controlled heat input and rapid deposition， emerges as a particularly suitable technique for the production of metal-supported SOFCs. In this study， metal-supported SOFCs were successfully prepared by atmospheric plasma spraying （APS）. This work focused on investigating the impact of spraying parameters on the regulation of the cathode structure of LSCFs. The single particle morphology deposited by APS was characterized in detail to elucidate the cathode deposition mechanism and assess its influence on cell performance. The results showed that the porous cathode coating， consisting of molten particles and partially molten particles， achieved optimal electrocatalytic performance at 14 kW. At an operating temperature of 800 °C， the cell exhibited a remarkably low polarization resistance of only 0.12 Ω·cm²， with a peak output power density reaching 1 074 mW·cm^-2， exhibiting excellent power output capability.