Ultrafast Electron Transfer Kinetics of Graphene Grown by Chemical Vapor Deposition
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 k0≥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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 13, 2015
- Source ID
- 10.1002/anie.201507005
Entities
People
- David G. Parobek
- Ganesh J. Shenoy
- Haitao Liu
- Min A Kim
- Nikoloz Nioradze
- Padmanabhan Santhosh
- Ran Chen
- Shigeru Amemiya
- Sumedh P. Surwade
- Zhiting Li
Organizations
- Air Force Office of Scientific Research
- National Science Foundation
- Office of Naval Research