Electrocatalysts composed of a Co(acetylacetonate)molecule and refluxed graphene oxide for an oxygen reduction reaction

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New Journal of Chemistry, ISSN: 1369-9261, Vol: 41, Issue: 14, Page: 6203-6209

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Yeonjun Shim; Yunseok Shin; Junghoon Oh; Sungjin Park; Young Jin Sa; Sang Hoon Joo; Hyunchul Ju
Royal Society of Chemistry (RSC); The Royal Society of Chemistry
Chemical Engineering; Chemistry; Materials Science
article description
Hybridization of organometallic complexes with carbon-based materials has been shown to enhance the catalytic performance in the oxygen reduction reaction (ORR). As chemical interactions between the metal centers and ligands are critical factors determining their tunable catalytic nature, it is important to understand the correlation between the chemical structure and catalytic nature and the correlation between the chemical structure and catalytic performance of the hybrids. In this work, the hybrids are synthesized by the reaction of an organometallic complex, Co(ii)(acac)(acac = acetylacetonate), with refluxed graphene oxide (Re-G-O) materials containing controlled amounts of oxygen atoms at room temperature. Experimental characterization of the hybrids reveals that Co(ii)(acac)is coordinated to oxygen containing groups in Re-G-O, generating organometallic species, Co-O-O. These hybrids showed better electrocatalytic activity for the ORR in alkaline media than Co-free Re-G-O materials. The results show that the Co-Ospecies is catalytically active for the ORR. We find that the best Co-Ocatalyst for the ORR is produced by the use of reduced graphene oxide with a medium level of reduction.