Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 43, Issue 48, Pages 21959-21968Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2018.10.028
Keywords
Nitrogen doped carbon nanotubes; Bifunctional catalyst; Oxygen reduction reaction; Oxygen evolution reaction; Rechargeable zinc-air batteries
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Funding
- Natural Science Foundation of China [51372057, 21373071]
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Highly active and stable bifunctional catalysts for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play a vital role in rechargeable zinc-air batteries. In this work, La2O3 and alloy nanoparticles (NiFe and NiCo) decorated nitrogen doped carbon nanotubes hybrids (denoted as La2O3/NiFe-NCNTs and La2O3/NiCo-NCNTs) were successfully prepared by the in-situ reduction procedure. The crystalline structure and morphology of hybrids were characterized by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). La2O3/NiFe-NCNTs revealed desirable bifunctional catalytic activities towards both oxygen reduction reaction (5.1 mA cm(-2) at 0.3 V vs. RHE) and oxygen evolution reaction (1.69 V vs. RHE at 10 mA cm(-2)) in alkaline media. Furthermore, rechargeable zinc-air batteries fabricated with La2O3/NiFe-NCNTs as the bifunctional catalyst demonstrated a small charge-discharge voltage gap (1.04 V) and long-term stability after charge-discharge cycling for 100 cycles. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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