Premium
Phosphorene as Cathode Material for High‐Voltage, Anti‐Self‐Discharge Zinc Ion Hybrid Capacitors
Author(s) -
Huang Zhaodong,
Chen Ao,
Mo Funian,
Liang Guojin,
Li Xinliang,
Yang Qi,
Guo Ying,
Chen Ze,
Li Qing,
Dong Binbin,
Zhi Chunyi
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202001024
Subject(s) - supercapacitor , materials science , capacitor , electrolyte , capacitance , zinc , electrolytic capacitor , polymer capacitor , anode , phosphorene , pseudocapacitance , optoelectronics , voltage , electrode , electrical engineering , chemistry , metallurgy , band gap , engineering
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 ZnCl 2 into the tetraethylammonium tetrafluoroborate in propylene carbonate (Et 4 NBF 4 /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.