Amino functionalization optimizes potential distribution: A facile pathway towards high-energy carbon-based aqueous supercapacitors

Yu M, Wang Z, Zhang H, Zhang P, Zhang T, Lu X, Feng X (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Nano Energy Elsevier

Book Volume: 65

Article Number: 103987

DOI: 10.1016/j.nanoen.2019.103987

Abstract

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.

Involved external institutions

Technische Universität Dresden DE Germany (DE) Sun Yat-Sen University CN China (CN)

How to cite

APA:

Yu, M., Wang, Z., Zhang, H., Zhang, P., Zhang, T., Lu, X., & Feng, X. (2019). Amino functionalization optimizes potential distribution: A facile pathway towards high-energy carbon-based aqueous supercapacitors. Nano Energy, 65. https://doi.org/10.1016/j.nanoen.2019.103987

MLA:

Yu, Minghao, et al. "Amino functionalization optimizes potential distribution: A facile pathway towards high-energy carbon-based aqueous supercapacitors." Nano Energy 65 (2019).

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