Self-assembly of cobalt-centered metal organic framework and multiwalled carbon nanotubes hybrids as a highly active and corrosion-resistant bifunctional oxygen catalyst

JOURNAL OF POWER SOURCES

卷:326

Article

Fang, Yiyun¹  Li, Xinzhe¹  Li, Feng¹  Lin, Xiaoqing¹  Tian, Min¹  Long, Xuefeng¹  An, Xingcai²  Fu, Yan³  Jin, Jun¹  Ma, Jiantai¹ 

[1] Lanzhou Univ, Coll Chem & Chem Engn, Key Lab Catalyt Engn Gansu Prov, Lanzhou 730000, Peoples R China

[2] Gansu Acad Sci, Nat Energy Inst, Lanzhou 730046, Gansu, Peoples R China

[3] Northwest Yongxin Coatings Co Ltd, Lanzhou 730046, Gansu, Peoples R China

关键词: Metal organic frameworks;    Multiwalled carbon nanotubes;    3D hierarchical structure;    Corrosion-resistant;    Bifunctional catalysts;   

DOI  :  10.1016/j.jpowsour.2016.06.114

来源: Elsevier

【 摘 要 】

Metal organic frameworks (MOF) derived carbonaceous materials have emerged as promising bifunctional oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) catalysts for electrochemical energy conversion and storage. But previous attempts to overcome the poor electrical conductivity of MOFs hybrids involve a harsh high-template pyrolytic process to in situ form carbon, which suffer from extremely complex operation and inevitable carbon corrosion at high positive potentials when OER is operated. Herein, a self-assembly approach is presented to synthesize a non-precious metal-based, high active and strong durable Co-MOF@CNTs bifunctional catalyst for OER and ORR. CNTs not only improve the transportation of the electrons but also can sustain the harsh oxidative environment of OER without carbon corrosion. Meanwhile, the unique 3D hierarchical structure offers a large surface area and stable anchoring sites for active centers and CNTs, which enables the superior durability of hybrid. Moreover, a synergistic catalysis of Co(II), organic ligands and CNTs will enhance the bifunctional electrocatalytic performance. Impressively, the hybrid exhibits comparable OER and ORR catalytic activity to RuO2 and 20 wt% Pt/C catalysts and superior stability. This facile and versatile strategy to fabricating MOF-based hybrids may be extended to other electrode materials for fuel cell and water splitting applications. (C) 2016 Elsevier B.V. All rights reserved.

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