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Co-and N-doped carbon nanotubes with hierarchical pores derived from metal-organic nanotubes for oxygen reduction reaction

查看全文 作　　者：Xuewan [1]Wang;Xiuan [1]Xi;Ge [1]Huo;Chenyu [2]Xu;Pengfei [2]Sui;Renfei [3]Feng;Xian-Zhu [1]Fu;Jing-Li [1,2]Luo 高影响力作者 机构地区：[1]College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China;[2]Department of Chemical and Materials Engineering,University of Alberta,Edmonton T6G 1H9,Alberta,Canada;[3]Canadian Light Source,Saskatoon S7N 2V3,Saskatchewan,Canada高影响力机构 出　　处：《Journal of Energy Chemistry》索引2021年第30卷第2期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Nos. 51902204, 21975163);the Bureau of Industry and Information Technology of Shenzhen (No. 201901171518);the support provided by Instrumental Analysis Center of Shenzhen University (Xili Campus)。 摘　　要：Biomolecules with a broad range of structure and heteroatom-containing groups offer a great opportunity for rational design of promising electrocatalysts via versatile chemistry.In this study,uniform folic acid-Co nanotubes(FA-Co NTs) were hydrothermally prepared as sacrificial templates for highly porous Co and N co-doped carbon nanotubes(Co-N/CNTs) with well-controlled size and morphology.The formation mechanism of FA-Co NTs was investigated and FA-Co-hydrazine coordination interaction together with the H-bond interaction between FA molecules was characterized to be the driving force for growth of one-dimensional nanotubes.Such distinct metal-ligand interaction afforded the resultant CNTs rich Co-N_x sites,hierarchically porous structure and Co nanoparticle-embedded conductive network,thus an overall good electrocatalytic activity for oxygen reduction.Electrochemical tests showed that Co-N/CNTs-900 promoted an efficient 4 e ORR process with an onset potential of 0.908 V vs.RHE,a limiting current density of 5.66 mA cm^(-2) at 0.6 V and a H_2 O_2 yield lower than 5%,comparable to that of 20%Pt/C catalyst.Moreover,the catalyst revealed very high stability upon continuous operation and remarkable tolerance to methanol. 关 键 词：Folic acid Metal–organic nanotube Carbon nanotube In situ doping Oxygen reduction
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