Journal
NANOTECHNOLOGY
Volume 30, Issue 43, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/ab31bf
Keywords
Zn-air battery; bifunctional catalysts; nitrogen-doped carbon nanotubes; CoNi alloy; bamboo-like
Funding
- National Natural Science Foundation of China [11474137]
- Fundamental Research Funds for the Central Universities [LZUMMM2018017, lzujbky-2018-121, lzujbky-2019cd02]
- Key Research and Development Plan of Gansu Province [18YF1GA088]
- Scientific research project of colleges and universities in Gansu province [2018A-205]
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It is essentially important to improve the performance of Zn-air batteries by studying bifunctional catalysts for oxygen evolution reactions (OER) and oxygen reduction reactions (ORR) with low-cost, high-efficiency and high-stability properties. Here, CoNi nanoparticles embedded in the bamboo-like N-doped carbon tubes (CoxNiy@NC) were synthesized, where the optimized catalyst of Co2Ni1 @NC exhibits superior bifunctional electrocatalytic activity, showing a low overpotential of 300 mV under the current density of 10 mA cm(-2) for OER and a large limiting current density of 3.76 mA cm(-2) under 0.40 V for ORR in an alkaline solution. In addition, the Co2Ni1@NC also shows excellent electrocatalytic activity in acidic and neutral solutions. Importantly, primary Zn-air batteries based on Co2Ni1@NC affords an excellent specific capacity of 834 mAh/g(Zn) with a discharge potential of 1.25 V at 5 mA cm(-2). A rechargeable Zn-air battery assembled with Co2Ni1@NC shows excellent cycling stability, where the first discharge and charge voltages reach 1.21 and 2.00 V under 1 mA cm(-2), respectively. This finding provides a simple synthesis approach, which allows one to construct bifunctional catalysts based on metal@NC for future energy conversion and storage devices.
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