Journal
ADVANCED MATERIALS
Volume 30, Issue 10, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201705431
Keywords
carbon catalysts; metal-air batteries; metal-organic frameworks; oxygen evolution reaction; oxygen reduction reaction
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Funding
- Natural Science Foundation of China [21401107, 51433005, 21771101, 21577065]
- International ST Cooperation Program of China [2014DFA90780]
- Natural Science Foundation of Jiangsu, China [BK20140986]
- China Scholarship Council
- Key Program of National Natural Science Foundation of China [51732002]
- National Key Research and Development Program of China [2017YFA0206500]
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Metal-organic frameworks (MOFs) and MOF-derived materials have recently attracted considerable interest as alternatives to noble-metal electrocatalysts. Herein, the rational design and synthesis of a new class of Co@N-C materials (C-MOF-C2-T) from a pair of enantiotopic chiral 3D MOFs by pyrolysis at temperature T is reported. The newly developed C-MOF-C2-900 with a unique 3D hierarchical rodlike structure, consisting of homogeneously distributed cobalt nanoparticles encapsulated by partially graphitized N-doped carbon rings along the rod length, exhibits higher electrocatalytic activities for oxygen reduction and oxygen evolution reactions (ORR and OER) than that of commercial Pt/C and RuO2, respectively. Primary Zn-air batteries based on C-MOF-900 for the oxygen reduction reaction (ORR) operated at a discharge potential of 1.30 V with a specific capacity of 741 mA h g(Zn)(-1) under 10 mA cm(-2). Rechargeable Zn-air batteries based on C-MOF-C2-900 as an ORR and OER bifunctional catalyst exhibit initial charge and discharge potentials at 1.81 and 1.28 V (2 mA cm(-2)), along with an excellent cycling stability with no increase in polarization even after 120 h - outperform their counterparts based on noble-metal-based air electrodes. The resultant rechargeable Zn-air batteries are used to efficiently power electrochemical water-splitting systems, demonstrating promising potential as integrated green energy systems for practical applications.
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