Phosphorene as Cathode Material for High-Voltage, Anti-Self-Discharge Zinc Ion Hybrid Capacitors

Zhaodong HUANG, Ao CHEN, Funian MO, Guojin LIANG, Xinliang LI, Qi YANG, Ying GUO, Ze CHEN, Qing LI, Binbin DONG, Chunyi ZHI

Research output: Journal PublicationsJournal Article (refereed)peer-review

169 Citations (Scopus)

Abstract

Output voltage and self-discharge rate are two important performance indices for supercapacitors, which have long been overlooked, though these play a very significant role in their practical application. Here, a zinc anode is used to construct a zinc ion hybrid capacitor. Expanded operating voltage of the hybrid capacitor is obtained with novel electrolytes. In addition, significantly improved anti-self-discharge ability is achieved. The phosphorene-based zinc ion capacitor exploiting a “water in salt” electrolyte with a working potential can reach 2.2 V, delivering 214.3 F g−1 after 5000 cycles. The operating voltage is further extended to 2.5 V through the use of an organic solvent as the electrolyte; the solvent is prepared by adding 0.2 m ZnCl2 into the tetraethylammonium tetrafluoroborate in propylene carbonate (Et4NBF4/PC) solvent, and it exhibits 105.9 F g−1 even after 9500 cycles. More importantly, the phosphorene-based capacitors possess excellent anti-self-discharge performance. The capacitors retain 76.16% of capacitance after resting for 300 h. The practical application of the zinc ion capacitor is demonstrated through a flexible paper-based printed microcapacitor. It is believed that the developed zinc ion capacitor can effectively resolve the severe self-discharge problem of supercapacitors. Moreover, high-voltage zinc ion capacitors provide more opportunities for the application of supercapacitors.

Original languageEnglish
Article number2001024
Number of pages10
JournalAdvanced Energy Materials
Volume10
Issue number24
Early online date7 May 2020
DOIs
Publication statusPublished - 23 Jun 2020
Externally publishedYes

Funding

This research was supported by GRF under Project N_CityU11305218. The work was also partially sponsored by the Science Technology and Innovation Committee of Shenzhen Municipality (Grant No. JCYJ20170818103435068) and a grant from City University of Hong Kong (Grant No. 9667165).

Keywords

  • anti-self-discharge
  • high voltage
  • phosphorene
  • zinc ion capacitors

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