Metal–organic framework-derived Co9S8 embedded in N, O and S-tridoped carbon nanomaterials as an efficient oxygen bifunctional electrocatalyst
| Autor: | Jin-Yan Zhao, Shan Wang, Shuang-Quan Zang, Hong Xu, Ya-Ru Lv, Rui Wang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Oxygen evolution 02 engineering and technology General Chemistry Overpotential 021001 nanoscience & nanotechnology Electrocatalyst Electrochemistry Catalysis Nanomaterials chemistry.chemical_compound Chemical engineering chemistry General Materials Science Metal-organic framework 0210 nano-technology Bifunctional |
| Zdroj: | Journal of Materials Chemistry A. 7:7389-7395 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/c8ta12116h |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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