阴离子调控LaCoO3/石墨烯复合空气电极的构筑及性能研究

LaCoO3钙钛矿型氧化物具有结构可调、成本低、制备工艺简单等特点，在可充电锌空气电池空气电极催化剂应用方面具有较大潜力，但目前仍存在电子传输性能差、氧反应动力学缓慢等问题。本项目拟采用非金属阴离子调控和掺杂石墨烯泡沫基底耦合来改善LaCoO3电子传输能力和氧反应动力学，提高其氧催化活性。通过设计LaCoO3/石墨烯空气电极的结构、掺杂阴离子种类和比例，探讨非金属阴离子对LaCoO3中Co金属阳离子、氧阴离子及氧空位的调控作用，解析其氧催化性能与晶体结构和电子结构之间的构效关系。采用XRD、Raman和XPS原位表征技术追踪氧催化活性位点微观结构和电子结构动态演变过程，揭示复合电极材料的协同催化机理，进而研制出新型高性能锌空气电池。本申请项目拟利用非金属阴离子调控钙钛矿材料的物化性质这一新的策略来构筑具有高催化活性的空气电极，有望为设计高功率、长寿命的锌空气电池空气电极材料提供新的思路。

LaCoO3 perovskite oxide has the advantages of adjustable structure, low cost, and simple preparation process. It has great potential in the application of air electrode catalysts for rechargeable zinc-air batteries. However, they still have problems such as poor electron transport performance and slow oxygen reaction kinetics. Herein，this project intends to use non-metallic anion regulation and doped graphene foam substrate coupling strategy to improve electron transport performance and oxygen reaction kinetics of LaCoO3, to increase its oxygen catalytic activity. By designing the structure, type and ratio of anion in LaCoO3/doped graphene, the regulation effect of non-metallic anions on Co metal cations, oxygen anions and oxygen vacancies in LaCoO3 will be discussed, and its oxygen catalytic performance and structure-activity relationship between crystal structure and electronic structure will be analyzed. In-situ XRD、Raman and XPS characterization techniques will be used to track the dynamic evolution of the microstructure and electronic structure of the active sites during the oxygen reaction, revealing the synergistic catalytic mechanism of the composite electrode material, and then developed a new type of high-performance zinc-air battery. This proposed project intends to use a new strategy of non-metallic anions to regulate the physical and chemical properties of perovskite materials to build an air electrode with high catalytic activity. It is expected to provide new ideas for designing high-power and long-life zinc air battery air electrode materials.