Mn-modified nitrogen-doped Pt-based electrocatalyst for efficient oxygen reduction in aluminum-air batteries  

作　　者：Li Gao Yang Song Xuebing Xu Chang Li Chaoquan Hu 

机构地区：[1]State Key Laboratory of Mesoscience and Engineering,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China [2]Zhongke Nanjing Institute of Green Manufacturing Industry,Nanjing 211135,China

出　　处：《Nano Research》2024年第8期7126-7135,共10页纳米研究（英文版）

基　　金：the National Natural Science Foundation of China(No.22078328);the Key Research Program of Nanjing IPE Institute of Green Manufacturing Industry。

摘　　要：In this study,a Mn-modified Pt-based catalyst loaded on nitrogen-doped Ketjen black(Mn-Pt/NKB)is prepared using a simple ethylene glycol reduction method.The size of Pt nanoparticles(NPs)is effectively controlled by doping with Mn and N.With the smallest average particle size of 1.7 nm,Mn-Pt/NKB demonstrates half-wave potentials of 0.890 and 0.688 V in the alkaline and neutral electrolytes,respectively,which are superior to those of commercial platinum on activated carbon(Pt/C).When applied as an air cathode in aluminum-air battery,it exhibits ultra-high power densities of 190(alkaline)and 26.2 mW·cm^(−2)(neutral).Moreover,the voltage remains stable after 5 h of discharge.The practical application performance of the Mn-Pt/NKB catalyst in an aluminum-air battery is better than that of commercial Pt/C.Furthermore,the oxygen reduction reaction(ORR)mechanism on surfaces with different particle sizes is analyzed using density functional theory.Oxygen cracking is the major pathway on the surface of the small particles with lower energy consumption of 0.5 eV,while water molecule cleavage is the major pathway on the surface of the large particles with higher energy consumption of 0.97 eV.The lower energy consumption of the oxygen cracking pathway further confirms the ORR mechanism for higher activity on small-sized surfaces.This study provides a direction for the rational design of Pt-based catalysts for ORR and sheds light on the commercial development of aluminum-air batteries.

关 键 词：oxygen reduction reaction precious metal catalysts aluminum-air battery density functional theory(DFT)calculations reaction pathway 

分 类 号：O64[理学—物理化学]