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Efficient Electron Transfer Processes and Enhanced Electrocatalytic Activity of Cobalt(II) Porphyrin Anchored on Graphene Oxide |
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| Authors: | Sung Cho Jong Min Lim Jung-Min You Seungwon Jeon Dongho Kim |
| Affiliation: | 1. Department of Chemistry, Chonnam National University, Gwangju 500-757 (Republic of Korea);2. Department of Chemistry, Yonsei University, Seoul 422-060 (Republic of Korea) These authors contributed equally.;3. Department of Chemistry, Yonsei University, Seoul 422-060 (Republic of Korea) |
| Abstract: | We investigated the electronic perturbation between graphene oxide and cobalt porphyrin to reveal the origin of the enhanced electrocatalytic activity of a hybrid complex using time-resolved spectroscopic measurements and theoretical calculations. The impulsively generated charge-separated state, GO−-(CoIIAPFP)+, undergoes fast charge recombination (<10 ps) between GO− and (CoIIAPFP)+ moieties. This fast charge recombination is directly related to the quick neutralization of (CoIIAPFP)+, which shortens the dead time of inactive CoIIIAPFP after the electrocatalytic reduction reaction. The fast transformation of inactive CoIIIAPFP to active CoIIAPFP is an important factor in the enhanced electrocatalytic activity of the hybrid complex. |
| Keywords: | charge transfer cobalt porphyrin electrocatalysts graphene oxygen reduction reaction (ORR) |