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Indexed by:期刊论文

Date of Publication:2012-11-01

Journal:INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE

Included Journals:SCIE、Scopus

Volume:7

Issue:11

Page Number:11323-11337

ISSN No.:1452-3981

Key Words:Anthraquinone; Electrocatalysis; Graphene; Nanocomposite; Oxygen reduction reaction

Abstract:Through direct electrochemical potentiostatic-potentiodynamic reduction of the starting materials of graphene oxide (GO) and Fast Red Al Salt, the anthraquinone functionalized graphene nanocomposite was developed as a highly efficient electrocatalyst for oxygen reduction reaction (ORR) in alkaline conditions. Scanning electron microscopy, Transmission electron microscopy, X-ray diffraction, Raman and X-ray photoelectron spectroscopy characterizations revealed that the most of oxygen-containing functional groups on GO were removed after electroreduction. The electrocatalytic ORR have systematically investigated by cyclic voltammetry, rotating disk electrode and rotating ring-disk electrode techniques. Results show that the anthraquinone covalently functionalized graphene afforded much greater electrocatalytic activity towards ORR in 0.1 M KOH than the sole graphene and anthraquinone covalently bonded glass carbon materials. At anthraquinone/graphene modified electrode, two reduction processes both attributed to 2e(-) reduction are recorded for ORR with HO2-. as intermediate. The presence of graphene nanosheets not only results in larger peak current and shifts the onset potential of ORR in the positive direction, but also leads to further reduction of partial HO2-. to OH- in the more negative potential region.