GAO Li^1,2,3，XU Xuebing^2,3，HU Chaoquan^2,3，ZHONG Jie^2,3,4，SUN Linbing¹

(1.College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China；2.State Key Laboratory of Multiphase Complex Systems；Insitiue of Process Engineering, Chinese Academy of Sciences(CAS), Beijing, 100190, China;3.Nanjing IPE Institute of Green Manufacturing Industry, Nanjing, 211135,China; 4.Capital Normal University, Beijing, 100048, China)

Abstract：A platinum-manganese alloy catalyst(Pt-Mn-N-KB)was synthesized by an impregnation reduction method using nitrogen-doped ketjenblack(N-KB)as the carrier.The morphology, structure, and surface composition of the catalysts were characterized by transmission electron microscopy(TEM), X-ray diffractometer(XRD), specific surface area, and X-ray photoelectron spectroscopy(XPS).The catalytic performances of the catalyst towards oxygen reduction in alkaline and neutral solutions were investigated.The results show that the Pt-Mn-N-KB catalyst exhibiting an uniform dispersion of Pt-Mn particles with an average size of 1.6 nm.A half-wave potential of 0.884 and an onset potential close to 1.01 V(vs.RHE)in alkaline solution were achieved.The corresponding values decreased to 0.686 and 0.83 V(vs.RHE), respectively, when the catalyst were tested in neutral solution.In both cases, the Pt-Mn-N-KB catalyst displayed better performances for oxygen redution reaction than the commercial Pt-C catalyst.When applying as the air cathode in an aluminum-air cell, the catalyst exhibited ultra-high power densities of 117.29(alkaline)and 25.65 mW/cm²(neutral).Compared with those of the commercial Pt-C catalyst, the power densities increased by 32% and 28%, respectively.

Keywords：oxygen reduction reaction; platinum-based catalyst; aluminum-air cell; activity; power density

Received：2022-09-19，Revised：2022-11-04,Online：2023-01-31 17:44。

Funding Project：国家自然科学基金项目，编号：22078328。

First Author：高丽(1997—)，女，硕士研究生，研究方向为电催化。E-mail：1325891245@qq.com。

Corresponding Author：

胡超权(1981—)，男，研究员，博士，博士生导师，研究方向为含碳可再生资源的利用及催化转化。E-mail：cqhu@ipe.ac.cn。

孙林兵(1980—)，男，教授，博士，博士生导师，研究方向为多孔材料。E-mail：lbsun@njtech.edu.cn。