二次热解优化的氮掺杂多孔碳催化氧还原反应研究
Nitrogen-doped porous carbon-catalyzed oxygen reduction reactions optimized by secondary pyrolysis
彭兴开 1李兰兰1
作者信息
- 1. 河北工业大学 材料科学与工程学院,天津 300401
- 折叠
摘要
利用二次热解制备了氮掺杂碳基无金属催化剂.研究发现:制备的催化剂在碱性环境中,半波电位高达0.905 V,且经10 000圈加速耐久试验后,半波电位仅衰减8 mV;由该催化剂组装的锌-空电池表现出180 mW∙cm-2的功率密度.实验结果表明,二次热解一方面会形成更多微孔,增加材料的比表面积,促进活性位点的有效暴露.另一方面,二次热解可以促进催化剂石墨化程度提高,从而减缓了碳腐蚀,避免氧还原过程中掺杂氮的大量流失,进而提高催化剂的稳定性.
Abstract
Nitrogen-doped carbon-based metal-free catalysts were prepared using secondary pyrolysis.It was found that the prepared catalyst had a high half-wave potential of 0.905 V in an alkaline environment and that the half-wave poten-tial only decayed by 8 mV after 10 000 cycles of accelerated endurance testing;the zinc-air cell assembled from the cata-lyst exhibited a power density of 180 mW∙cm-2.The experimental results show that the secondary pyrolysis will form more micropores,increase the specific surface area of the material,and promote the effective exposure of the active sites.Moreover,it can promote a higher degree of graphitization of the catalyst,which slows down the carbon corrosion and avoids a large loss of doped nitrogen during the oxygen reduction process,thus improving the stability of the catalyst.
关键词
碳基无金属催化剂/氧还原反应/氮掺杂/稳定性/锌-空电池Key words
carbon-based metal-free catalysts/oxygen reduction reactions/nitrogen doping/stability/zinc-air batteries引用本文复制引用
基金项目
河北省自然科学基金资助项目(B2021202011)
国家自然科学基金资助项目(22179032)
出版年
2024
NETL
NSTL
万方数据