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
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.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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