Resolving the mismatch between the practical potential window (PPW) and the available capacitive potential window of supercapacitor electrodes provides a feasible way to expand the operating voltage of supercapacitors, which further boosts energy density. Here, our research unveils a unique approach to manually control the PPW of the corresponding carbon-based supercapacitors (CSCs) by rational functionalization with amino groups. The extra pair of electrons from amino N atoms naturally adsorbs cations in the electrolyte, which rationalizes the surface charge of the carbon electrode and adjusts the PPW. A remarkable voltage expansion is achieved for CSCs, from 1.4 V to its maximum limit, 1.8 V, correspondently resulting in an approximately 1-fold increase in the energy density. Importantly, such a simple strategy endows our CSCs with an outstanding maximum energy density of 7.7 mWh cm⁻³, which is not only among the best values reported for thin-film CSCs but also comparable to those reported for Li thin-film batteries. These encouraging results are believed to bring fundamental insights into the nature of potential control in energy storage devices.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:74442 |
| Date | 16 April 2021 |
| Creators | Yu, Minghao, Wang, Zifan, Zhang, Haozhe, Zhang, Panpan, Zhang, Tao, Lu, Xihong, Feng, Xinliang |
| Publisher | Elsevier |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 2211-2855, 103987, 10.1016/j.nanoen.2019.103987, info:eu-repo/grantAgreement/European Commission/H2020 | SGA-RIA/785219//GrapheneCore2/Graphene Flagship Core Project 2, info:eu-repo/grantAgreement/European Commission/H2020 | ERC | ERC-POC/768930//Scalable and efficient production of functionalized, high-performance solution-processable graphene-materials/HIPER-G, info:eu-repo/grantAgreement/Deutsche Forschungsgemeinschaft/Exzellenzcluster/194636624//Zentrum für Perspektiven in der Elektronik Dresden/cfaed |
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