期刊
MATERIALS ADVANCES
卷 2, 期 13, 页码 4264-4276出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ma00783h
关键词
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资金
- CNPq [301486/2016-6]
- FAPESP [2014/02163-7, 2017/11958-1, 2018/20756-6]
- FAPEMIG
- CNPq (PQ-2 grant) [301095/2018-3]
- Shell
- ANP (Brazil's National Oil, Natural Gas, and Biofuels Agency) through the R&D levy regulation
The composite material of multi-walled carbon nanotubes and activated carbon shows promising performance as an electrode for electrical double-layer capacitors. A ratio of 1:3 of MWCNTs to AC demonstrates the best electrochemical properties with high specific capacitance reaching theoretical limits and a high working voltage window of 1.4V in aqueous solution.
We report on multi-walled carbon nanotubes (MWCNTs) and an activated carbon (AC) composite material as an electrode for electrical double-layer capacitors (EDLCs). Material flexibility, robustness, and electrical conductivity are features that come from the MWCNTs, while a high specific surface area is an AC's intrinsic property. We prepared different MWCNT : AC ratios in solutions, which were filtered to form a buckypaper. We investigated the specific capacitance, equivalent series resistance, working voltage window (WVW), and the specific energy and power. The best electrochemical findings were obtained for the MWCNT : AC ratio of 1 : 3 with a specific capacitance reaching the theoretical limit. A high working voltage window of 1.4 V was verified in aqueous solution. Simultaneously, the symmetric cells were able to cycle for more than one million cycles in fast charge-discharge galvanostatic tests with 93% capacitance retention. Finally, the main criticism regarding the self-supported electrode materials is the difficulty of welding. In this sense, we presented a particular welding process as proof of concept for electrode scalability. Overall, this novel electrode material exhibits a set of exciting properties, which we now tested in EDLCs.
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