Boosting the Energy Density of Carbon‐Based Aqueous Supercapacitors by Optimizing the Surface Charge

The voltage of carbon‐based aqueous supercapacitors is limited by the water splitting reaction occurring in one electrode, generally resulting in the promising but unused potential range of the other electrode. Exploiting this unused potential range provides the possibility for further boosting thei...

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Published inAngewandte Chemie International Edition Vol. 56; no. 20; pp. 5454 - 5459
Main Authors Yu, Minghao, Lin, Dun, Feng, Haobin, Zeng, Yinxiang, Tong, Yexiang, Lu, Xihong
Format Journal Article
LanguageEnglish
Published Germany Wiley Subscription Services, Inc 08.05.2017
EditionInternational ed. in English
Subjects
aqueous supercapacitors
Carbon
Density
Electric potential
Electrodes
Electrolytes
Energy
energy density
Flux density
porous carbon
potential window
Splitting
Supercapacitors
Surface charge
Voltage
Water splitting
potential window
porous carbon
surface charge
energy density
aqueous supercapacitors
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Summary:The voltage of carbon‐based aqueous supercapacitors is limited by the water splitting reaction occurring in one electrode, generally resulting in the promising but unused potential range of the other electrode. Exploiting this unused potential range provides the possibility for further boosting their energy density. An efficient surface charge control strategy was developed to remarkably enhance the energy density of multiscale porous carbon (MSPC) based aqueous symmetric supercapacitors (SSCs) by controllably tuning the operating potential range of MSPC electrodes. The operating voltage of the SSCs with neutral electrolyte was significantly expanded from 1.4 V to 1.8 V after simple adjustment, enabling the energy density of the optimized SSCs reached twice as much as the original. Such a facile strategy was also demonstrated for the aqueous SSCs with acidic and alkaline electrolytes, and is believed to bring insight in the design of aqueous supercapacitors. AquaMSPC: An efficient surface charge control strategy was developed to remarkably enhance the energy density of multiscale porous carbon‐based aqueous symmetric supercapacitors by controllably tuning the operating potential range of MSPC electrodes.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201701737