Li Kaiqi, Cheng Ruiqi, Xue Qingyue, Zhao Tianshuo, Wang Fei, Fu Chaopeng
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
ACS Appl Mater Interfaces. 2023 Feb 13. doi: 10.1021/acsami.2c13871.
The rational design of non-noble metal-based electrocatalysts for an efficient oxygen reduction reaction (ORR) is an important research topic to promote the advancement of aluminum-air batteries. In this work, heterostructural Co/MnO nanoparticles encapsulated in a N-doped carbon electrocatalyst were prepared via one-step pyrolysis utilizing different reduction potentials of Co and Mn ions, and the heterointerface between the two phases was confirmed. The prepared catalyst displays Pt/C competitive ORR performance because of the interfacial synergy of a Co/MnO Mott-Schottky (M-S) heterostructure, which leads to boosted conductivity, formation of an M-S barrier, and a reduced oxygen reduction energy barrier for excited electrons. Furthermore, the Co/MnO-based aluminum-air battery displays good discharge performance, demonstrating good feasibility for practical application.
设计用于高效氧还原反应（ORR）的非贵金属基电催化剂是推动铝空气电池发展的一个重要研究课题。在这项工作中，利用钴离子和锰离子不同的还原电位，通过一步热解制备了包裹在氮掺杂碳电催化剂中的异质结构Co/MnO纳米颗粒，并证实了两相之间的异质界面。由于Co/MnO莫特-肖特基（M-S）异质结构的界面协同作用，所制备的催化剂表现出与Pt/C相当的ORR性能，这导致了导电性增强、M-S势垒的形成以及激发电子的氧还原能垒降低。此外，基于Co/MnO的铝空气电池表现出良好的放电性能，证明了其实际应用的良好可行性。
