Self-discharge of supercapacitors based on carbon nanotubes with different diameters
Zhang W, Yang W, Zhou H, Zhang Z, Zhao M, Liu Q, Yang J, Lu X (2020)
Publication Language: English
Publication Type: Journal article
Publication year: 2020
Journal
Book Volume: 357
Pages Range: 136855
DOI: 10.1016/j.electacta.2020.136855
Abstract
The self-discharge of supercapacitors was investigated using electrodes composed of multiwalled carbon nanotubes (MWCNTs) of three different diameters: 20, 30, and 50 nm, respectively. A combined selfdischarge mechanism including both ohmic leakage and diffusion-controlled faradaic reaction was employed to fit the open circuit voltage (OCV) decays of the supercapacitors. The existence of both large
inter-bundle pores and small intra-bundle pores in the MWCNT electrodes led to a two-stage diffusioncontrolled faradaic reaction process - while the first stage can be described as a divided diffusioncontrolled (DDC) process due to the diffusion of ions from both inter- and intra-bundle pores, and the
second stage corresponds to a single diffusion-controlled (SDC) process mainly due to the diffusion of
ions from the intra-bundle pores. The diffusion parameters obtained based on this model were consistent with the measured self-discharge rates which increased with the size of the MWCNTs. The results of
this work demonstrate that electrode materials with wide pore size distributions may be associated with
more complex self-discharge processes.
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China (CN)How to cite
APA:
Zhang, W., Yang, W., Zhou, H., Zhang, Z., Zhao, M., Liu, Q.,... Lu, X. (2020). Self-discharge of supercapacitors based on carbon nanotubes with different diameters. Electrochimica Acta, 357, 136855. https://dx.doi.org/10.1016/j.electacta.2020.136855
MLA:
Zhang, Wei, et al. "Self-discharge of supercapacitors based on carbon nanotubes with different diameters." Electrochimica Acta 357 (2020): 136855.
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