钴/氮掺杂碳催化剂及其氧还原催化机理研究

以尿素做氮源、醋酸钴做金属源,用湿法合并高温热处理法合成了钴/氮共掺杂碳的非贵金属氧还原催化剂Co-N/C-T.采用循环伏安（CV）法和线性扫描法（LSV）探究了氮源和金属源用量以及热处理温度对氧还原反应电催化活性的影响,活性最好的催化剂Co0.13-N0.3/C-800的峰电位达到0.829V（vs.RHE）,接近商用Pt/C的活性,但比商用Pt/C有更好的耐甲醇性和稳定性.同时,采用SEM、TEM、BET、XRD和XPS方法表征了催化剂结构和组分特征,并提出催化剂可能的电催化活性氧还原反应机理....

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Bibliographic Details
Published in电化学 Vol. 23; no. 6; pp. 627 - 637
Main Author 姜孟秀;张晶;李月华;张蓉
Format Journal Article
LanguageChinese
Published 2017
Subjects
氧还原
活性位
热处理
电催化作用
钴/氮共掺杂碳催化剂
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Summary:以尿素做氮源、醋酸钴做金属源,用湿法合并高温热处理法合成了钴/氮共掺杂碳的非贵金属氧还原催化剂Co-N/C-T.采用循环伏安（CV）法和线性扫描法（LSV）探究了氮源和金属源用量以及热处理温度对氧还原反应电催化活性的影响,活性最好的催化剂Co0.13-N0.3/C-800的峰电位达到0.829V（vs.RHE）,接近商用Pt/C的活性,但比商用Pt/C有更好的耐甲醇性和稳定性.同时,采用SEM、TEM、BET、XRD和XPS方法表征了催化剂结构和组分特征,并提出催化剂可能的电催化活性氧还原反应机理.
Bibliography:cobalt-based nitrogen-doped carbon catalyst;electrocatalysis;oxygen reduction reaction;catalytic active site;heat-treatmentx
Transition metal-nitrogen co-doped carbon catalysts have attracted significant attention because of their reasonable activity and remarkable selectivity toward oxygen reduction reaction（ORR） as cathodic reaction in fuel cells.However,the role of transition metal in the active sites of the catalysts still is uncertain.In this work,the Cox-Ny/C-T catalysts were prepared with BP2000 as a carbon source,urea（Ur） as a nitrogen source and Co（OAc）2·4H2O as a metal precursor by a simple chemical method.Meanwhile,in order to optimize the ORR activity,the catalysts were synthesized with different amounts of Co and urea,and heat-treated at different temperatures from 6001000°C.SEM,TEM,BET,XRD and XPS techniques were used to characterize the catalysts in terms of structures and compositions,as well as the catalytic active sites.CV and LSV were measured to compare the ORR activity and to obtain the el
ISSN:1006-3471
2993-074X
DOI:10.13208/j.electrochem.170105