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NiFe-LDHs@MnO2 heterostructure as a bifunctional electrocatalyst for oxygen-involved reactions and Zn-air batteries

NiFe-LDHs@MnO2 heterostructure as a bifunctional electrocatalyst for oxygen-involved reactions... Nanoscaled nickel–iron layered double hydroxides (NiFe-LDHs) were coated on α-MnO2 via a chemical co-precipitation method. The resulting NiFe-LDHs@MnO2 composite served as a bifunctional electrocatalyst, which combined the high catalytic activities of NiFe-LDHs for oxygen evolution reaction (OER) and MnO2 for oxygen reduction reaction (ORR), respectively. The as-fabricated NiFe-LDHs@MnO2 electrode manifests a high current density of 93 and 48 mA·cm−2 recorded at 0.6 and − 0.3 V vs. Hg/HgO, respectively, comparable to that of commercial Pt/C catalyst (58 and 31 mA·cm−2, respectively). Moreover, such a composite can serve as an air electrode in the rechargeable zinc-air battery. The as-assembled zinc-air battery using NiFe-LDHs@MnO2 cathode exhibits a discharge voltage at 1.08–1.15 V and charge voltage at 2.05–2.11 V after a cycle of 42 h at 25 mA·cm−2, demonstrating a desired cycling stability. The proposed compositing strategy herein may pave a way for the exploration of novel electrode materials for rechargeable metal-air batteries with superior electrochemical performances. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ionics Springer Journals

NiFe-LDHs@MnO2 heterostructure as a bifunctional electrocatalyst for oxygen-involved reactions and Zn-air batteries

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Publisher
Springer Journals
Copyright
Copyright © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2022
ISSN
0947-7047
eISSN
1862-0760
DOI
10.1007/s11581-021-04436-9
Publisher site
See Article on Publisher Site

Abstract

Nanoscaled nickel–iron layered double hydroxides (NiFe-LDHs) were coated on α-MnO2 via a chemical co-precipitation method. The resulting NiFe-LDHs@MnO2 composite served as a bifunctional electrocatalyst, which combined the high catalytic activities of NiFe-LDHs for oxygen evolution reaction (OER) and MnO2 for oxygen reduction reaction (ORR), respectively. The as-fabricated NiFe-LDHs@MnO2 electrode manifests a high current density of 93 and 48 mA·cm−2 recorded at 0.6 and − 0.3 V vs. Hg/HgO, respectively, comparable to that of commercial Pt/C catalyst (58 and 31 mA·cm−2, respectively). Moreover, such a composite can serve as an air electrode in the rechargeable zinc-air battery. The as-assembled zinc-air battery using NiFe-LDHs@MnO2 cathode exhibits a discharge voltage at 1.08–1.15 V and charge voltage at 2.05–2.11 V after a cycle of 42 h at 25 mA·cm−2, demonstrating a desired cycling stability. The proposed compositing strategy herein may pave a way for the exploration of novel electrode materials for rechargeable metal-air batteries with superior electrochemical performances.

Journal

IonicsSpringer Journals

Published: Mar 1, 2022

Keywords: Manganese dioxide; Nickel–iron layered double hydroxide; Composite; Bifunctional electrocatalyst; Zinc-air battery

References