Enhanced Electrocatalytic Performance of Co3O4/Ketjen-Black Cathodes for Li-O2 Batteries

Zhang, Dan, Wang, Baoqi, Jiang, Yinzhu, Zhou, Peng, Chen, Zhihui, Xu, Ben and Yan, Mi (2015) Enhanced Electrocatalytic Performance of Co3O4/Ketjen-Black Cathodes for Li-O2 Batteries. Journal of Alloys and Compounds, 653. pp. 604-610. ISSN 0925-8388

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Official URL: http://dx.doi.org/10.1016/j.jallcom.2015.09.068

Abstract

A series of Co3O4/Ketjen Black cathodes are fabricated by electrostatic spray deposition technique for Li-O2 batteries. A sluggish kinetics of oxygen reduction reaction and oxygen evolution reaction processes is noted either when Co3O4 is lacked or Ketjen Black is insufficient, which leads to much higher overpotentials between charge and discharge profiles. By contrast, with the optimal design in terms of electric conduction and catalytic activity, the Co3O4/Ketjen Black (80 wt%) composite achieves enhanced electrochemical performance with an initial discharge capacity of 2044 mAh g-1 and maintaining 33 cycles at a fixed capacity of 500 mAh g-1. The electrochemical characterization indicates that the improved Li-O2 battery performance may benefit from the highest oxygen reduction reaction and oxygen evolution reaction activity under this electro-chemically optimized composite. This work may shed light on the design principle of future cathode materials for Li-O2 batteries.

Item Type: Article
Uncontrolled Keywords: lithium-oxygen battery, cobalt oxide, electrostatic spray deposition, electrical conductivity, catalytic activity
Subjects: F200 Materials Science
H300 Mechanical Engineering
J500 Materials Technology not otherwise specified
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Bin Xu
Date Deposited: 14 Sep 2015 08:42
Last Modified: 10 May 2017 15:24
URI: http://nrl.northumbria.ac.uk/id/eprint/23740

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