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Ultrafast Electron Transfer Kinetics of Graphene Grown by Chemical Vapor Deposition
Author(s) -
Chen Ran,
Nioradze Nikoloz,
Santhosh Padmanabhan,
Li Zhiting,
Surwade Sumedh P.,
Shenoy Ganesh J.,
Parobek David G.,
Kim Min A.,
Liu Haitao,
Amemiya Shigeru
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201507005
Subject(s) - graphene , chemical vapor deposition , materials science , electron transfer , electrochemistry , electrode , cyclic voltammetry , scanning electron microscope , chemical engineering , substrate (aquarium) , reactivity (psychology) , polystyrene , nanotechnology , chemistry , photochemistry , composite material , medicine , oceanography , alternative medicine , pathology , geology , engineering , polymer
Abstract High electrochemical reactivity is required for various energy and sensing applications of graphene grown by chemical vapor deposition (CVD). Herein, we report that heterogeneous electron transfer can be remarkably fast at CVD‐grown graphene electrodes that are fabricated without using the conventional poly(methyl methacrylate) (PMMA) for graphene transfer from a growth substrate. We use nanogap voltammetry based on scanning electrochemical microscopy to obtain very high standard rate constants k 0 ≥25 cm s −1 for ferrocenemethanol oxidation at polystyrene‐supported graphene. The rate constants are at least 2–3 orders of magnitude higher than those at PMMA‐transferred graphene, which demonstrates an anomalously weak dependence of electron‐transfer rates on the potential. Slow kinetics at PMMA‐transferred graphene is attributed to the presence of residual PMMA. This unprecedentedly high reactivity of PMMA‐free CVD‐grown graphene electrodes is fundamentally and practically important.