From 3D ZIF Nanocrystals to Co-Nx/C Nanorod Array Electrocatalysts for ORR, OER, and Zn-Air Batteries

被引:724
|
作者
Amiinu, Ibrahim Saana [1 ]
Liu, Xiaobo [1 ]
Pu, Zonghua [1 ]
Li, Wenqiang [1 ]
Li, Qidong [2 ]
Zhang, Jie [1 ]
Tang, Haolin [1 ]
Zhang, Haining [1 ]
Mu, Shichun [1 ]
机构
[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Hubei, Peoples R China
[2] Wuhan Univ Technol, WUT Harvard Joint Nano Key Lab, Wuhan 430070, Hubei, Peoples R China
基金
中国国家自然科学基金;
关键词
bifunctional electrocatalysts; DFT computation; nanorod array; ZIF nanocrystals; Zn-air batteries; METAL-ORGANIC FRAMEWORK; OXYGEN REDUCTION REACTION; NANOPOROUS CARBON; POROUS CARBON; EFFICIENT OXYGEN; ENERGY-STORAGE; SURFACE-AREA; NITROGEN; GRAPHENE; EVOLUTION;
D O I
10.1002/adfm.201704638
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Designing a highly active electrocatalyst with optimal stability at low cost is must and non-negotiable if large-scale implementations of fuel cells are to be fully realized. Zeolitic-imidazolate frameworks (ZIFs) offer rich platforms to design multifunctional materials due to their flexibility and ultrahigh surface area. Herein, an advanced Co-N-x/C nanorod array derived from 3D ZIF nanocrystals with superior electrocatalytic activity and stability toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) compared to commercial Pt/C and IrO2, respectively, is synthesized. Remarkably, as a bifunctional catalyst (E-j = 10 (OER) - E-1/2 (ORR) approximate to 0.65 V), it further displays high performance of Zn-air batteries with high cycling stability even at a high current density. Such supercatalytic properties are largely attributed to the synergistic effect of the chemical composition, high surface area, and abundant active sites of the nanorods. The activity origin is clarified through post oxygen reduction X-ray photoelectron spectroscopy analysis and density functional theory studies. Undoubtedly, this approach opens a new avenue to strategically design highly active and performance-oriented electrocatalytic materials for wider electrochemical energy applications.
引用
收藏
页数:9
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