Porous Co3O4 nanoplates as the active material for rechargeable Zn-air batteries with high energy efficiency and cycling stability

Peng Tan, Bin Chen, Haoran Xu, Weizi Cai, Wei He, Meng Ni

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)

Abstract

Efficient electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are crucial for rechargeable Zn-air batteries. We report porous Co3O4 nanoplates with the average size and thickness of ∼100 and ∼20 nm, respectively, and a surface area of 98.65 m2 g−1. The mesoporous nanostructure shortens the lengths for ion/electron transport and provides abundant reaction sites. In the alkaline solution, the Co3O4 nanoplates exhibit a comparable limiting current density to that of Pt/C in the ORR and a superior activity in the OER. Redox reactions corresponding to the oxidation/reduction of cobalt species with a high pseudocapacitance and stability are observed, indicating the multifunctional properties. Using Co3O4 nanoplates in the air electrode, the Zn-air battery delivers a maximum power density of 59.7 mW cm−2. At a current density of 1 mA cm−2, a gravimetric energy density of 901.6 Wh kgZn−1 and an energy efficiency of 67.3% are achieved. Moreover, the voltage gaps between discharge and charge as well as the energy efficiency of 58% at 10 mA cm−2 are maintained for 100 cycles. The porous Co3O4 nanoplate is a promising active material for efficient Zn-air batteries with excellent cycling stability and high energy density.

Original languageEnglish
Pages (from-to)1241-1248
Number of pages8
JournalEnergy
Volume166
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • Cobalt oxide
  • Energy efficiency
  • Multifunctional material
  • Porous nanoplate
  • Zn-air battery

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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