Issue 13, 2019

Metal–organic framework-derived Co9S8 embedded in N, O and S-tridoped carbon nanomaterials as an efficient oxygen bifunctional electrocatalyst

Abstract

Designing tailor-made metal–organic frameworks (MOFs) to synthesize target nanomaterials with extraordinary electrochemical oxygen catalytic activity is highly desirable. Here, we rationally designed a 2D Co-MOF [Co(BDC)2(SPDP)2(DMF)(H2O)] (H2BDC = 1,4-benzenedicarboxylic acid, SPDP = 4,4′-(sulfonylbis(4,1-phenylene))dipyridine, DMF = N,N-dimethylformamide) as a single-source precursor through direct carbonization to afford an N, O and S-tridoped carbon matrix encapsulated with Co9S8 nanocomposites (Co9S8@TDC). By virtue of the intrinsic activity of Co9S8 nanoparticles (NPs) as well as the heteroatom-doped carbon shell, Co9S8@TDC possessed excellent electrocatalytic activities for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in alkaline solutions. In particular, Co9S8@TDC-900 displayed an overpotential of 330 mV (vs. RHE) at current density of 10 mA cm−2 for OER and a half-wave potential of 0.78 V (vs. RHE) for ORR with the limiting current density of 5.45 mA cm−2, rivalling the performances of RuO2 and Pt/C. As the proof of concept, Co9S8@TDC-900 was employed as a bifunctional oxygen catalyst for a rechargeable Zn–air battery, exhibiting a considerable open-circuit voltage (1.50 V) and impressive long-term charge/discharge stability (45 h at 5 mA cm−2). The straightforward strategy provides a facile method for the further exploration of non-noble metal electrochemical oxygen reaction catalysts.

Graphical abstract: Metal–organic framework-derived Co9S8 embedded in N, O and S-tridoped carbon nanomaterials as an efficient oxygen bifunctional electrocatalyst

Supplementary files

Article information

Article type
Paper
Submitted
15 Dec 2018
Accepted
27 Feb 2019
First published
28 Feb 2019

J. Mater. Chem. A, 2019,7, 7389-7395

Metal–organic framework-derived Co9S8 embedded in N, O and S-tridoped carbon nanomaterials as an efficient oxygen bifunctional electrocatalyst

J. Zhao, R. Wang, S. Wang, Y. Lv, H. Xu and S. Zang, J. Mater. Chem. A, 2019, 7, 7389 DOI: 10.1039/C8TA12116H

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