文献类型：期刊文献

英文题名：3D Nitrogen, Sulfur-Codoped Carbon Nanomaterial-Supported Cobalt Oxides with Polyhedron-Like Particles Grafted onto Graphene Layers as Highly Active Bicatalysts for Oxygen-Evolving Reactions

作者：Huang, Xiaobo[1];Wang, Jianqiang[2];Bao, Hongliang[2];Zhang, Xiangkun[1];Huang, Yongmin[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Specially Funct Polymer Mat & Related Tec, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Appl Phys, 2019 Jialuo Rd, Shanghai 201800, Peoples R China

年份：2018

卷号：10

期号：8

起止页码：7180

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20181004861248);WOS:【SCI-EXPANDED(收录号:WOS:000426618000044)】；

基金：X.H., X.Z., and Y.H. received funding from the National Natural Science Foundation of China (no. 21476071).

语种：英文

外文关键词：oxygen electrode reactions; ZIF-67; 3D hierarchical porous structure; bicatalyst; carbon nanomaterials

摘要：The extensive research and developments of highly efficient oxygen electrode electrocatalysts to get rid of the kinetic barriers for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are very important in energy conversion and storage devices. Especially, exploring nonprecious metal alternatives to replace traditional noble metal catalysts with high cost and poor durability is the paramount mission. In this paper, we utilize property-flexible ZIF-67 and sulfur-functionalized graphene oxide to obtain a cobalt, nitrogen, and sulfur codoped nanomaterial with 3D hierarchical porous structures, owing to their rich dopant species and good conductivity. The crosslinked structures of polyhedron particles throughout the whole carbon framework speeds up the mass transportation and charge-delivery processes during oxygen-evolving reactions. Also, by exploring the location and coordination type of sulfur dopants, we emphasize the effects of sulfone and sulfide functional groups anchored into the graphitic structure on enhancing the catalytic abilities for ORR and OER. To note, compared to the noble metal electrocatalysts, the best-performing CoO@Co3O4/NSG-650 (0.79 V) is 40 mV less active than the commercial Pt/C catalyst (0.83 V) for ORR and merely 10 mV behind IrO2 (1.68 V) for OER. Besides, the metric between ORR and OER difference for CoO@Co3O4/NSG-650 to evaluate its overall electrocatalytic activity is 0.90 V, surpassing 290 and 430 mV over Pt/C (1.19 V) and IrO2 (1.33 V). Comprehensively, the as-prepared CoO@Co3O4/NSG-650 indicates excellent bifunctional catalytic activities for ORR and OER, which shows great potential for replacing noble metal catalysts in the application of fuel cells and metal air batteries.