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A Li-doped Co3O4 oxygen evolution catalyst for non-precious metal alkaline anion exchange membrane water electrolysers

Lookup NU author(s): Dr Xu Wu, Professor Keith Scott

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Abstract

Li-doped Co3O4 (LixCo3-xO4, x = 0, 0.07, 0.21, 0.35, 0.49) spinel powders were prepared with a thermal decomposition method and characterized by XRD, SEM, TEM, and XPS. The LixCo3-xO4 samples were formed as tetragonal powders with a simple spinel structure and with particle sizes about 30-40 nm. All LixCo3-xO4 samples exhibited a 50 mV more negative onset potential for oxygen evolution reaction (OER) than Co3O4. The influence of Li-doping is discussed regarding cation distribution, electronic conductivity and oxygen binding energy. Li0.21Co2.79O4 exhibited the highest OER activity amongst the five samples. A single cell, non-precious metal alkaline anion exchange membrane water electrolysers (AAEMWE) with Li0.21Co2.79O4 anode exhibited a current density of 300 mA cm(-2) at a voltage 2.2 to 2.05 V at temperatures of 20-45 degrees C and the stability was examined with a continuous operation for 10 h at 300 mA cm(-2) and at 30 degrees C. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Publication metadata

Author(s): Wu X, Scott K

Publication type: Article

Publication status: Published

Journal: International Journal of Hydrogen Energy

Year: 2013

Volume: 38

Issue: 8

Pages: 3123-3129

Print publication date: 19/03/2013

Online publication date: 23/01/2013

Acceptance date: 13/12/2012

ISSN (print): 0360-3199

ISSN (electronic): 1879-3487

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.ijhydene.2012.12.087

DOI: 10.1016/j.ijhydene.2012.12.087


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