Issue 5, 2020

Hierarchical Co3O4 nanorods anchored on nitrogen doped reduced graphene oxide: a highly efficient bifunctional electrocatalyst for rechargeable Zn–air batteries

Abstract

Zn–air batteries are amongst the most promising energy storage technologies due to high theoretical energy density for which their practical application is tied to development of low-cost, effective bifunctional catalysts. Herein, a highly efficient bifunctional electrocatalyst was synthesized by hybridizing hierarchical spinel Co3O4 nano-rods with N-rGO. A rational design of the nano-hybrid was realized through optimizing catalytic activity of the pure Co3O4 NRs followed by their grafting onto N-rGO nanosheets. The optimized hybrid (N-rGO/Co3O4 NRs) showed an excellent bifunctional (ORR/OER) catalytic activity with ΔE = Ej=10E1/2 as small as 0.78 V, outperforming state-of-the-art noble-metal catalysts (e.g. PtRuC). Rechargeable Zn–air batteries assembled with a N-rGO/Co3O4 NRs hybrid delivered a specific capacity of 875 mA h gZn−1 (corresponding to an exceptional energy density of 1115 W h kgZn−1), a peak power density of 47 mW cm−2 and a stable cycling stability compared to Zn–air batteries based on PtRuC commercial catalyst. Outstanding electrochemical performance of the hybrid ORR/OER catalyst is credited to the hierarchical nature of Co3O4 NRs, optimized Co3+/Co2+ ratio, particle agglomeration prevention and superior electrical conductivity resulting from the hybridization with N-rGO. Rational design of atomic-scale interfaces in the spinel metal oxide-carbon hybrid structures demonstrated here provides new insights for the designing and fabrication of high-performance bifunctional non-precious electrocatalysts for rechargeable Zn–air batteries.

Graphical abstract: Hierarchical Co3O4 nanorods anchored on nitrogen doped reduced graphene oxide: a highly efficient bifunctional electrocatalyst for rechargeable Zn–air batteries

Supplementary files

Article information

Article type
Paper
Submitted
29 10 2019
Accepted
29 1 2020
First published
03 2 2020

Catal. Sci. Technol., 2020,10, 1444-1457

Hierarchical Co3O4 nanorods anchored on nitrogen doped reduced graphene oxide: a highly efficient bifunctional electrocatalyst for rechargeable Zn–air batteries

J. S. Sanchez, R. R. Maça, A. Pendashteh, V. Etacheri, V. A. de la Peña O'Shea, M. Castillo-Rodríguez, J. Palma and R. Marcilla, Catal. Sci. Technol., 2020, 10, 1444 DOI: 10.1039/C9CY02183C

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements