Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 797, Issue -, Pages 1041-1049Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.05.205
Keywords
Zinc-air batteries; NiCo alloy nanoparticles; Multi-dimensional carbon architecture; ORR; OER
Categories
Funding
- National Natural Science Foundation of China [21705058, 21506081]
- Six Talent Peaks Project of Jiangsu Province [XNY-009]
- Provincial Natural Science Foundation of Jiangsu [BK20170524]
- Chinese Postdoctoral Foundation [2018T110450]
- High-tech Research Key laboratory of Zhenjiang [SS2018002]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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One of the crucial issues in rechargeable zinc-air batteries is to explore low-cost, highly efficient bifunctional electrocatalysts for the oxygen reduction/evolution reaction. Here, the unique NiCo alloy nanoparticles encapsulated in the multi-dimensional nitrogen-doped carbon architecture (NiCo/MNC) is reported as an effective bifunctional catalyst for rechargeable zinc-air batteries. The multi-dimensional nitrogen-doped carbon architecture was synthesized through the rapid calcination of two-dimensional graphitic carbon nitride (g-C3N4) and one-dimensional multi-walled carbon nanotubes (MWCNTs). The g-C3N4 serves as the nitrogen source and the precursor for N-doped carbon nanosheets (NCSs). Simultaneously, NCSs can intertwine with MWCNTs to further obtain the multi-dimensional architecture with a large specific surface area. The synergistic effect between multi-dimensional nitrogen-doped carbon architectures and NiCo alloy nanoparticles endowed the NiCo/MNC with a positive half-wave potential of 0.83 V (vs. RHE: Reversible Hydrogen Electrode) for oxygen reduction reaction and a low potential of 1.61 V (vs. RHE) at the current density of 10 mA cm(-2) for oxygen evolution reaction. Moreover, the zinc-air battery assembled with NiCo/MNC as the air-cathode exhibited a high-power density of 135.2 mW cm(-2), a specific capacity of 701.7 mAh g(-1), and an excellent stability in charging/discharging cycle test (over 115 h). The prepared catalyst could potentially serve to take the place of precious metal catalysts in rechargeable zinc-air batteries. (C) 2019 Elsevier B.V. All rights reserved.
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