期刊
ELECTROCHIMICA ACTA
卷 348, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136274
关键词
Tubular carbon nanoarchitecture; Electrocatalysis; Oxygen electrocatalyst; Zn-air battery
资金
- Science and Engineering Research Board (SERB), New Delhi [EMR/2016/002271]
- IIT Kharagpur
- DST, India
- IIT Kharagpur, India
Synthesis of cost-effective, robust, and efficient bifunctional electrocatalyst for the development of rechargeable Zn-air batteries (ZAB) is of considerable interest. Herein, we demonstrate the synthesis of NiCo alloy integrated nitrogen-doped tubular carbon (TC) nanostructure (NiCo-N-TC) using metalorganic self-assembly of M(II)-melamine-dipicolinic acid (DPA) (M: Ni(II), Co(II)). The NiCo alloy particles of as-synthesized NiCo-N-TC catalyst are confined at the tip like a cork. The as-synthesized catalyst was structurally engineered by acid treatment. The engineered catalyst (NiCo-N-TC-H) has an open-head hollow nanoarchitecture with uniform distribution of ultrafine NiCo alloy particles on the TC framework. The NiCo-N-TC-H catalyst follows desired 4-electron pathway for the electroreduction of oxygen in both alkaline and acidic pH. It has outstanding bifunctional electrocatalytic activity towards oxygen reduction and oxygen evolution reaction in alkaline electrolyte with a very low potential gap (Delta E) of 0.74 V. Acid-treatment-induced increase in surface area, and graphitic-N and carbon content facilitates the overall bifunctional activity. The bifunctional activity of NiCo-N-TC-H is successfully utilized for the development of rechargeable ZAB. It has long cycling stability and delivers high open circuit voltage (1.54 V), power density of 148.8 mW cm(-2), and high voltaic efficiency. (C) 2020 Elsevier Ltd. All rights reserved.
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