期刊
CARBON
卷 130, 期 -, 页码 768-774出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2018.01.064
关键词
-
资金
- Guangdong Innovative and Entrepreneurial Team Program [2016ZT06C517]
- European Research Council under the European Union's Seventh Framework Programme/ERC [320403]
For many electrochemical applications, glassy carbon is an important electrode material that acts as a catalyst support and carbon nanotubes are frequently exploited as a catalyst itself or as a support for other active materials. Here we demonstrate a carbon-based, nanostructured, and high surface area electrode that consist of individual, free standing and vertically aligned multi-wall carbon nanotubes (MWCNTs) directly grown on glassy carbon via direct current plasma enhanced chemical vapour deposition. The structure is characterized via electron microscopy techniques, and local current-voltage measurements on individual MWCNTs confirm a good Ohmic contact of the individual vertically aligned MWCNTs and the glassy carbon bulk electrode. The proposed electrode can be used as a model system to study the mass transport of vertically aligned one-dimensional nanomaterials in electrochemistry applications. Its electrochemical characteristics are investigated using aqueous Ru(NH3)(6)(3+/2+) as an outer sphere redox couple. Cyclic voltammetry measurements show a significant increase in double-layer capacitance of the textured electrodes with respect to pristine glassy carbon. Finally, we demonstrate that the morphology of textured electrodes results in altered mass transport properties and yields a mixed linear-and thin-layer diffusion response depending on the scan rate, which is illustrated through numerical simulations. (c) 2018 Elsevier Ltd. All rights reserved.
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