氧化锰基电催化材料的设计合成及其铝空气电池应用

电催化剂作为铝空气电池阴极的核心部分，其催化性能的优劣直接影响铝空气电池的产业化进程。本文采用尿素高温处理法将商业的Vulcan-72XC碳材料进行掺氮改性处理制备了N/VC₂。在此基础上，进一步负载不同的锰氧化物得到三种Mn₃O₄@N/VC₂、MnO@N/VC₂和MnO₂@N/VC₂复合材料。其中，MnO₂@N/VC₂具有最优的氧还原反应(ORR)催化性能，起始电位高达0.872 V。作为铝空气电池阴极催化剂，在大电流密度下放电功率密度可达到136 mW·cm^-2。本文通过对比分析不同氧化锰基复合材料的电催化性能，研究了碳载体和锰氧化物之间的交互作用。结果表明，多孔结构和丰富缺陷位点的协同作用是提高材料催化活性的主要原因。该工作为锰基氧化物催化剂的研发提供理论依据。

Design and Synthesis of Manganese Oxide-Based Electrocatalytic Materials and Application in Aluminum Air Battery

As the core part of Al-air batteries cathode, the catalytic performance of electrocatalyst affects the industrialization process of Al-air batteries. In this work, nitrogen-doped carbon material (N/VC₂) was prepared through urea high temperature treatment method based on commercial Vulcan-72XC carbon material. Mn₃O₄@N/VC₂, MnO@N/VC₂ and MnO₂@N/VC₂ composites were further obtained by loading different manganese oxides. MnO₂@N/VC₂ displays the superior oxyen reduction reaction (ORR) performence with the positive onset potential of 0.872 V. In addition, Al-air battery based on MnO₂@N/VC₂ shows excellent discharge performance in high current density, and the maximum power density can reach 136 mW·cm^-2. The interaction between carbon carrier and manganese oxide was studied by comparing the electrocatalytic properties of different composites. The results show that the synergistic action of porous structure and abundant defect sites is the main reason for improving the catalytic activity of the material. This work provides a theoretical basis for the research and development of manganese-based oxide catalysts.