Open AccessExcellent Electrochemical Performance of Potassium Ion Capacitor Achieved by a High Nitrogen Doped Activated Carbon
Author(s) -
Zhi Chen,
Wenlei Li,
Jian Yang,
Jiaxuan Liao,
Cheng Chen,
Yaochen Song,
Syed Abbas Ali Shah,
Ziqiang Xu,
Mengqiang Wu
Publication year - 2020
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ab6a84
Subject(s) - supercapacitor , materials science , capacitor , electrochemistry , graphene , energy storage , carbon fibers , activated carbon , lithium (medication) , electrode , ion , chemical engineering , nanotechnology , composite number , composite material , electrical engineering , chemistry , power (physics) , voltage , organic chemistry , adsorption , physics , quantum mechanics , endocrinology , engineering , medicine
Supercapacitors, due to their unique high-power characteristics, are bound to occupy a place in the field of energy storage. Carbon-based supercapacitor is one of the most promising in all material systems. In this work, N-doped/graphene composite activated carbon (AC) is prepared through a facile method as electrodes for the comparison between an aqueous system and an organic system. The obtained AC shows high surface areas of 1600 m 2 g −1 with a high N content of 11.7 wt% and is simultaneously applied to lithium-ions capacitor (LIC), sodium-ions capacitor (NIC) and potassium ion capacitor (KIC). Electrochemical evaluations indicated that the high N-doped activated carbon-based LIC, NIC and KIC possess different performance and energy storage mechanisms. The KIC exhibits the highest energy density of 50 Wh kg −1 at 0.4 A g −1 and the most stable cycle performance of three capacitors. This work reveals differences among the three types of ion capacitors, providing clues for the development of high power-energy and long life ion supercapacitors. Moreover, KIC has better performance than LIC, and the reserve of K is much higher than Li, which makes KIC a better application prospect.