氮掺杂三维多孔石墨烯的孔隙结构与锌-空气电池氧还原电催化性能的关系
Relationship between pore structure of N-doped 3D porous graphene and electrocatalytic performance of oxygen reduction in zinc-air battery
孙启锋 1欧昌锐 1廖亚林 1鲍丽施 1刘洪波 2陈惠2
作者信息
- 1. College of Materials Science and Engineering,Hunan University,Changsha 410082,China
- 2. College of Materials Science and Engineering,Hunan University,Changsha 410082,China;Advanced Carbon Materials Research Institute in Hunan Province,Changsha 410082,China
- 折叠
摘要
氮掺杂石墨烯材料具有高效、低成本的优点,在燃料电池领域有着广阔的应用前景.通过水热法和高温热解法使用石墨相氮化碳(g-C3N4)与石墨烯成功制备了含氮三维多孔石墨烯催化剂(H-N-Gr).石墨相氮化碳(g-C3N4)与石墨烯在水热过程中通过氢键和π-π共轭键组装成稳定的复合前驱体,可以在不改变热处理石墨烯结构的情况下增加氮原子的掺杂.制备的H-N-Gr具有较高的比表面积(470.3 m2/g),表面有大量催化活性的吡啶氮(25.4%)和石墨化氮(37.3%),具有较强的氧还原反应(ORR)催化活性.此外,制备的H-N-Gr具有比商用铂碳催化剂更强的催化稳定性和甲醇耐受性,其中稳定性超出商用铂碳催化剂19.7%,组装成的锌-空气电池表现出高功率密度(202.90 mW/cm2)和快速倍率性能.本研究为制备高性能ORR无金属催化剂提供了一种简单实用的方法.
Abstract
Nitrogen-doped(N-doped)graphene materials with highly-efficient and low cost have a promising application in fuel cell.Herein,N-doped 3D porous graphene catalyst(H-N-Gr)is successfully obtained by hydrothermal and high temperature pyrolysis.Graphitic carbon nitride(g-C3N4)and graphene can assemble intentionally into a stable composite precursor through hydrogen bonding and π-π conjugation in hydrothermal process,which can increase doping of nitrogen atoms without changing graphene structure after heat treatment.The prepared H-N-Gr has great catalytic activity for oxygen reduction reaction(ORR)due to its high specific surface area(470.3 m2/g)and the plenty of catalytically active pyridine nitrogen(25.4%)and graphitized nitrogen(37.3%)on the surface.In addition,the prepared H-N-Gr has better catalytic stability and methanol tolerance than commercial platinum-carbon catalysts,and exhibits high power density(202.90 mW/cm2)and rapid rate performance when assembled into zinc-air batteries.This research provides a simple and practical method to prepare a high performance ORR metal-free catalyst.
关键词
燃料电池/氧还原反应/石墨相氮化碳/氮掺杂石墨烯/锌空气电池Key words
fuel cell/oxygen reduction reaction/g-C3N4/nitrogen-doped graphene/zinc-air battery引用本文复制引用
基金项目
Hunan Provincial key Research and Development Plan,China(2020GK4027)
出版年
2023
NETL
NSTL
维普
万方数据