Enhanced oxygen reduction reaction on La-Fe bimetal in porous N-doped carbon dodecahedra with CNTs wrapping  

作　　者：Yi Zhou Yanzhen Liu Yani Yan Zonglin Yi Yongfeng Li Cheng-Meng Chen 

机构地区：[1]College of Biomedical Engineering,Taiyuan University of Technology,Taiyuan 030024,China [2]CAS Key Laboratory of Carbon Materials,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China [3]College of Materials Sciences and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Chinese Chemical Letters》2025年第1期618-622,共5页中国化学快报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.22278291);the Natural Science Foundation of Shanxi Province(Nos.202203021211145 and 202303021221257);the National Key Research and Development(R&D)Program of China(No.2020YFB1505803);the Key Research and Development(R&D)Projects of Shanxi Province(No.202102070301018)。

摘　　要：The oxygen reduction reaction(ORR)is a crucial process in Zn-air systems,and the catalyst plays a significant role in this reaction.However,reported catalysts often suffer from poor durability and stability during the ORR process.Herein,we synthesized La-Fe bimetallic nanoparticles encapsulated in a N-doped porous carbon dodecahedron(La-Fe/NC)originated from ZIF-8 by a simple direct carbonization.The La-Fe/NC catalyst had a numerous mesopores and dendritic outer layer generated by carbon nanotubes(CNTs),forming a high conductivity network that helped to optimize electron transfer and mass transport in the ORR process.The effect of different doping transition metals and metal ratios on the ORR activity of Zn-air batteries was investigated.In alkaline media,the La-Fe/NC showed the highest ORR catalytic activity,with a half-wave potential(E_(1/2))of 0.879 V(vs.RHE,Pt/C 0.845 V).After 5000 cycles,the E_(1/2)of the La-Fe/NC catalyst only decreased by 7 m V,and its performance in stability tests and methanol tolerance tests was superior to Pt/C.When used as the air electrode in a Zn-air battery,the La-Fe/NC catalyst demonstrated an excellent specific capacity of 755 m Ah/g and a peak power density of179.8 m W/cm~2.The results provide important insights for the development of high-performance Zn-air batteries and new directions for the design of ORR catalysts.

关 键 词：ELECTROCATALYST ORR Bimetallic nanoparticle Dendritic CNTs Zn-air battery 

分 类 号：TM911.41[电气工程—电力电子与电力传动] O643.36[理学—物理化学]