I want to make a Asymmetric supercapacitor.
So it can have more Working voltage limit than Symmetric supercapacitor.
But I wonder there will be electrolyte decomposion, and how to conclude the Voltage window for Supercapacitor.
You can check this review (Design and Mechanisms of Asymmetric Supercapacitors)
Chemical Reviews 2018 118 (18), 9233-9280
DOI: 10.1021/acs.chemrev.8b00252
You can check this review (Design and Mechanisms of Asymmetric Supercapacitors)
Chemical Reviews 2018 118 (18), 9233-9280
DOI: 10.1021/acs.chemrev.8b00252
Yeonghun Yun
Here are some of my thoughts:
If possible, search the literature on similar electrodes or devices as yours, and check what temperature the authors used. This step will help you to estimate what potential window your setup could be, but the estimation needs to be verified experimentally.
How? Simple. Scan your device either using cyclic voltammogram (CV) or constant-current charge-discharge (GCP) method. For CV, within the potential window you select, the curve should exhibit no sharp increase in current at both limits of the potential window. For GCP, your device should be able to charge and discharge without significant deviation from a sloping profile within the window you choose. If electrolyte decomposition does happen, you will find the charging or discharging curve plateau at the upper or lower limits.
Hello Yeonghun Yun ,
See my answer at the following RG discussion:
https://www.researchgate.net/post/How_can_we_measure_the_supercapacitance_by_cyclic_voltammetry
I attach some literature that I hope can help.
Jules
The following amazing review can let you understand most of supercapacitors mechanisms and calculations
Chemical Reviews 2018 118 (18), 9233-9280
DOI: 10.1021/acs.chemrev.8b00252
in addition to the following links
https://www.tecategroup.com/ultracapacitors-supercapacitors/ultracapacitor-FAQ.php
Best of luck
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