Zhang, C;
Xu, Y;
Du, G;
Wu, Y;
Li, Y;
Zhao, H;
Kaiser, U;
(2020)
Oxygen-functionalized soft carbon nanofibers as high-performance cathode of K-ion hybrid capacitor.
Nano Energy
, 72
, Article 104661. 10.1016/j.nanoen.2020.104661.
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Abstract
Facing the calling for the new generation of large-scale energy storage systems that are sustainably low cost based on earth-abundant and renewable elements, the K-ion hybrid capacitor (KIHC) constructed with both carbonaceous cathode and anode will be one of the best choices. By using oxygen-functionalized engineering, we first obtained oxygen-containing soft carbon nanofibers (ONC) cathodes which delivered a high reversible capacity of 130 mA h g−1 over 200 cycles at a current density of 50 mA g−1 within a high voltage window. Even at 5.0 A g−1, a practical capacity of 68 mA h g−1 maintained. The surface-controlled reaction domination instead of diffusion-controlled reaction domination was proposed to harvest high capacitance performance. This storage model effectively overcomes the sluggish properties of storing large-sized K-ions by a diffusion-controlled reaction in conventional cathodes in K-ion batteries (KIBs). The rational design of oxygen functionalization towards approaching more and stable active sites was highlighted. Moreover, a renewable and low-cost full KIHC was configurated by carbonaceous cathode and anode derived from a single carbon source.
| Type: | Article |
|---|---|
| Title: | Oxygen-functionalized soft carbon nanofibers as high-performance cathode of K-ion hybrid capacitor |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.nanoen.2020.104661 |
| Publisher version: | https://doi.org/10.1016/j.nanoen.2020.104661 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Energy storage; K-ion hybrid capacitor; Oxygen-functionalized engineering; Carbon nanofibers |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10093517 |
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