Efficient Electron Transfer Processes and Enhanced Electrocatalytic Activity of Cobalt(II) Porphyrin Anchored on Graphene Oxide

Sung Cho; Jong Min Lim; Jung Min You; Seungwon Jeon; Dongho Kim

doi:10.1002/ijch.201500022

Efficient Electron Transfer Processes and Enhanced Electrocatalytic Activity of Cobalt(II) Porphyrin Anchored on Graphene Oxide

Sung Cho, Jong Min Lim, Jung Min You, Seungwon Jeon, Dongho Kim

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6 Scopus citations

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^--(Co^IIAPFP)⁺, undergoes fast charge recombination (<10 ps) between GO^- and (Co^IIAPFP)⁺ moieties. This fast charge recombination is directly related to the quick neutralization of (Co^IIAPFP)⁺, which shortens the dead time of inactive Co^IIIAPFP after the electrocatalytic reduction reaction. The fast transformation of inactive Co^IIIAPFP to active Co^IIAPFP is an important factor in the enhanced electrocatalytic activity of the hybrid complex.

Original language	English
Pages (from-to)	169-174
Number of pages	6
Journal	Israel Journal of Chemistry
Volume	56
Issue number	2-3
DOIs	https://doi.org/10.1002/ijch.201500022
State	Published - Mar 2016

Keywords

charge transfer
cobalt porphyrin
electrocatalysts
graphene
oxygen reduction reaction (ORR)

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10.1002/ijch.201500022

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title = "Efficient Electron Transfer Processes and Enhanced Electrocatalytic Activity of Cobalt(II) Porphyrin Anchored on Graphene Oxide",

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.",

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author = "Sung Cho and Lim, {Jong Min} and You, {Jung Min} and Seungwon Jeon and Dongho Kim",

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language = "English",

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TY - JOUR

T1 - Efficient Electron Transfer Processes and Enhanced Electrocatalytic Activity of Cobalt(II) Porphyrin Anchored on Graphene Oxide

AU - Cho, Sung

AU - Lim, Jong Min

AU - You, Jung Min

AU - Jeon, Seungwon

AU - Kim, Dongho

PY - 2016/3

Y1 - 2016/3

N2 - 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.

AB - 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.

KW - charge transfer

KW - cobalt porphyrin

KW - electrocatalysts

KW - graphene

KW - oxygen reduction reaction (ORR)

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DO - 10.1002/ijch.201500022

M3 - Article

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SN - 0021-2148

VL - 56

SP - 169

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JO - Israel Journal of Chemistry

JF - Israel Journal of Chemistry

IS - 2-3

ER -

Efficient Electron Transfer Processes and Enhanced Electrocatalytic Activity of Cobalt(II) Porphyrin Anchored on Graphene Oxide

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