Ultrafast Electron Transfer Kinetics of Graphene Grown by Chemical Vapor Deposition

被引：48

作者：

Chen, Ran ^{[1
]}

Nioradze, Nikoloz ^{[1
]}

Santhosh, Padmanabhan ^{[1
]}

Li, Zhiting ^{[1
]}

Surwade, Sumedh P. ^{[1
]}

Shenoy, Ganesh I. ^{[1
]}

Parobek, David G. ^{[1
]}

Kim, Min A. ^{[1
]}

Liu, Haitao ^{[1
]}

Amemiya, Shigeru ^{[1
]}

机构：

[1] Univ Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2015年 / 54卷 / 50期

基金：

美国国家科学基金会;

关键词：

chemical vapor deposition; electrochemistry; graphene; nanogap voltammetry; scanning electrochemical microscopy; SCANNING ELECTROCHEMICAL MICROSCOPY; SINGLE-LAYER GRAPHENE; MULTILAYER GRAPHENE; GRAPHITE; NANOELECTRODES; NANOTUBES; SURFACE;

D O I：

10.1002/anie.201507005

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 cms(-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 electrontransfer 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.

引用

页码：15134 / 15137

页数：4

共 23 条

[1] Scanning Electrochemical Microscopy [J].