期刊
RENEWABLE ENERGY
卷 125, 期 -, 页码 250-259出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2018.02.089
关键词
Bifunctional catalysts; Metal-air batteries; Air electrodes; Carbon nanofibers; Transition metal oxides
资金
- Accordo di Programma CNR-MiSE, Gruppo tematico Sistema Elettrico Nazionale - Progetto: Sistemi elettrochimici per l'accumulo di energia
In this work, carbon nanofibers (CNF) synthesized by electrospinning are loaded with a combination of nickel and cobalt, both in the metallic and oxide forms (NiCo-loaded CNF), and studied as bifunctional air electrodes for metal-air batteries. The performance of the NiCo-loaded CNF sample is compared with a similarly prepared CoOCo/CNF catalyst both for oxygen reduction and evolution reactions. The combination of nickel and cobalt, both in metallic and oxide form, leads to a bifunctional catalyst with a half wave potential for the ORR of 874 mV vs. RHE and a reversibility (Delta EOER-ORR) of 764 mV. The stability of the catalyst is assessed by means of a 24 h chronopotentiometric test at -80 mA cm(-2) and charge discharge cycles (30 min each) at +/- 20 mA cm(-2). NiCo-loaded CNF shows a remarkable stability, maintaining a constant potential during both tests. (C) 2018 Elsevier Ltd. All rights reserved.
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