The value of mixed conduction for oxygen electroreduction on graphene-chitosan composites

Wu, Kuang-Hsu (Tim), Wang, Da-Wei and Gentle, Ian R. (2014) The value of mixed conduction for oxygen electroreduction on graphene-chitosan composites. Carbon, 73 234-243. doi:10.1016/j.carbon.2014.02.059


Author Wu, Kuang-Hsu (Tim)
Wang, Da-Wei
Gentle, Ian R.
Title The value of mixed conduction for oxygen electroreduction on graphene-chitosan composites
Journal name Carbon   Check publisher's open access policy
ISSN 0008-6223
1873-3891
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.carbon.2014.02.059
Open Access Status Not yet assessed
Volume 73
Start page 234
End page 243
Total pages 10
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Abstract Graphene-based electrocatalysts have been widely investigated for their excellent performance in electrocatalytic oxygen reduction. The surface chemistry of graphene-based electrocatalysts is important for developing more efficient fuel cells and metal-air batteries. In addition, the nanostructured gas-diffusion electrode (GDE) on which the electrocatalysts are loaded needs to be carefully tailored to facilitate mass transport (reactants and products). A polymer binder is often used to fabricate the GDE which means there is a need to optimize the ratio of binder to electrocatalyst. Herein we demonstrate the impacts of graphene-based GDE nanostructures on the efficiency of oxygen electroreduction by comparing a series of graphene/chitosan composites with varying compositions. In these nanostructured GDEs graphene acts as the electrocatalyst and chitosan as the binder. Our results illustrate a critical ratio of graphene to chitosan for enhanced electrocatalytic surface area and facilitated mass transport, while a continuous network for electron conduction is effectively established. We believe this work is an important piece of the puzzle to better understanding the electrode behavior of electrocatalysts consisting of graphene-like two-dimensional materials in oxygen reduction reaction.
Keyword Chemistry, Physical
Materials Science, Multidisciplinary
Chemistry
Materials Science
CHEMISTRY, PHYSICAL
MATERIALS SCIENCE, MULTIDISCIPLINARY
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP110100550
Institutional Status UQ

 
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