Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/102268
Title: Unusual inherent electrochemistry of graphene oxides prepared using permanganate oxidants
Authors: Eng, Alex Yong Sheng
Ambrosi, Adriano
Chua, Chun Kiang
Šaněk, Filip
Sofer, Zdeněk
Pumera, Martin
Keywords: DRNTU::Science::Chemistry
Issue Date: 2013
Source: Eng, A. Y. S., Ambrosi, A., Chua, C. K., Šaněk, F., Sofer, Z., & Pumera, M. (2013). Unusual inherent electrochemistry of graphene oxides prepared using permanganate oxidants. Chemistry - a European journal, 19(38), 12673-12683.
Series/Report no.: Chemistry - a European journal
Abstract: Graphene and graphene oxides are materials of significant interest in electrochemical devices such as supercapacitors, batteries, fuel cells, and sensors. Graphene oxides and reduced graphenes are typically prepared by oxidizing graphite in strong mineral acid mixtures with chlorate (Staudenmaier, Hofmann) or permanganate (Hummers, Tour) oxidants. Herein, we reveal that graphene oxides pose inherent electrochemistry, that is, they can be oxidized or reduced at relatively mild potentials (within the range ±1 V) that are lower than typical battery potentials. This inherent electrochemistry of graphene differs dramatically from that of the used oxidants. Graphene oxides prepared using chlorate exhibit chemically irreversible reductions, whereas graphene oxides prepared through permanganate-based methods exhibit very unusual inherent chemically reversible electrochemistry of oxygen-containing groups. Insight into the electrochemical behaviour was obtained through cyclic voltammetry, chronoamperometry, and X-ray photoelectron spectroscopy experiments. Our findings are of extreme importance for the electrochemistry community as they reveal that electrode materials undergo cyclic changes in charge/discharge cycles, which has strong implications for energy-storage and sensing devices.
URI: https://hdl.handle.net/10356/102268
http://hdl.handle.net/10220/16806
ISSN: 0947-6539
DOI: 10.1002/chem.201301889
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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