Engineering rich defects in nitrogen-doped porous carbon to boost oxygen reduction reaction kinetics  

作　　者：Yanqiu Wang XinJing Huang Yang Liu Wenhao He ZhongLiang Tian Ya Li Wenzhang Li 

机构地区：[1]School of Chemistry and Chemical Engineering,Central South University,Changsha 410083,Hunan,China [2]School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China [3]Hunan Institute of Metrology and Test,Changsha 410083,Hunan,China

出　　处：《Journal of Energy Chemistry》2024年第12期417-425,共9页能源化学（英文版）

基　　金：financially supported by the Joint Funds of the National Natural Science Foundation of China (U20A20280);the Joint Funds of the National Natural Science Foundation of China(U22A20170)。

摘　　要：Metal-free carbon-based materials offer a promising alternative to Pt-based catalysts for the oxygen reduction reaction (ORR).However,challenges persist due to its sluggish kinetics and poor acid ORR performance.Here,we introduce a novel nitrogen-doped porous carbon with rich defects sites (such as pentagons,edge and vacancy defects)(PV/HPC) via a simple etching strategy.The PV/HPC demonstrates long-term stability and exceptional catalytic activity with half-wave potential of 0.9 V and average electron transfer number of 3.98 in alkaline solution while 0.78 V and 3.78 in acidic solution,indicating its efficiency and robustness as an ORR catalyst.Additionally,it achieves a higher kinetic current density of 91.9 m A cm^(-2)at 0.8 V,which is 1.75 times that of Pt/C (52.5 mA cm^(-2)).Furthemore,it enables Al-air battery to attain a maximum power density of 487 mW cm^(-2),compared to 477 mW cm^(-2) for the Pt/C catalyst.Density functional theory (DFT) calculations elucidate that the introduction of multifunctional defects in nitrogen-doped porous carbon collectively reduces the reaction energy barrier of the departure of OH*and boosts the oxygen reduction reaction kinetics.This work presents a simple method to design durable and effective carbon-based ORR catalysts.

关 键 词：Oxygen reduction reaction Carbon-based catalyst Rich defects Porous structure Al-air battery 

分 类 号：TQ127.11[化学工程—无机化工] TQ426[电气工程—电力电子与电力传动] TM911.4