期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 49, 页码 46303-46310出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b14161
关键词
electron transfer; kinetics; interface; graphene quantum dots; cyclic voltammetry; electrode
资金
- National Science Foundation (NSF) [CHE-1565971]
Electrochemical performance of nanostructured carbon electrodes was evaluated using cyclic voltammetry and a simple simulation model. The electrodes were prepared from soluble precursors by anodic electrodeposition of two sizes of graphene quantum dot assemblies (hexabenzocoronene (HBC) and carbon quantum dot (CQD)) onto a conductive support. Experimental and simulated voltammograms enabled the extraction of the following electrode parameters: conductivity of the electrodes (a combination of ionic and electronic contributions), density of available electrode states at different potentials, and tunneling rate constant (Marcus Gerischer model) for interfacial charge transfer to ferrocene/ferrocenium (Fc/Fc(+)) couple. The parameters indicate that HBC and CQD have significant density of electronic states at potentials more positive than -0.5 V versus Ag/Ag+ Enabled by these large densities, the electron transfer rates at the Fc/Fc(+) thermodynamic potential are several orders of magnitude slower than those commonly observed on other carbon electrodes. This study is expected to accelerate the discovery of improved synthetic carbon electrodes by providing fast screening methodology of their electrochemical behavior.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据