摘要
结合静电纺丝和热处理技术,在含钴碳纳米纤维上原位生长了氮掺杂石墨烯,制备了三维互通纤维网结构。研究了钴含量对产物氧还原活性的影响。结果表明:氮掺杂石墨烯的生成和钴的引入均显著提高了电催化活性。纺丝液中六水合硝酸钴与聚丙烯腈的质量比为1:10时,获得的催化剂活性最优,起始电势为0.84 V(vs RHE),反应为近四电子路径,具有比铂碳更好的稳定性和耐甲醇毒化能力。三维互通结构促进了电子和质子传输,并能提供更多的活性位点,提高电催化活性。这种方法也可用于设计其它三维互通的纤维复合物,在能源与环境领域具有更广泛的应用前景。
By combining the techniques of electrospinning and heat-treatment, N-doped graphene(NG) were in situ grown on cobalt-containing electronspun carbon nanofibers(CNF) to form three-dimensional(3D) interconnected fiber network structure. The effect of cobalt(Co) content on the oxygen reduction reaction(ORR) activity of the as-prepared samples was studied. It is demonstrated that both the formation of NG and introduction of Co significantly increase the electrocatalytic activity. The hybrid shows optimized ORR performance when the weight ratio of Co(NO3)2·6H2O to PAN in electronspun solution is 1: 10. The as-obtained catalyst exhibits superior ORR catalytic performance with onset potential of 0.84 V(vs RHE), near four electron transfer pathway. In addition, the sample presents better stability and methanol tolerance than Pt/C in alkaline media. As-obtained interconnected fiber networks facilitate electron and mass transfer to provide more active sites, favorable to the enhancement of electrocatalytic activity. This strategy is also available to prepare other 3D interconnected fiber composites for using in energy and environmental fields.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2016年第4期351-357,共7页
Journal of Inorganic Materials
基金
国家自然科学基金(51203182
51173202)
湖南省优秀博士学位论文获得者科研项目(YB2014B004)
低维量子物理国家重点实验室(清华大学)开放基金(KF201312)
广西信息材料重点实验室(桂林电子科技大学)开放基金(桂能科1210908-01-K)~~
关键词
氧还原反应
氮掺杂石墨烯
原位制备
三维互通纤维网
oxygen reduction reaction
N-doped graphene
in situ-preparation
3D interconnected fiber network