Open AccessPotassium Ion Storage: Direct Structure–Performance Comparison of All‐Carbon Potassium and Sodium Ion Capacitors (Adv. Sci. 12/2019)
Author(s) -
Xu Ziqiang,
Wu Mengqiang,
Chen Zhi,
Chen Cheng,
Yang Jian,
Feng Tingting,
Paek Eunsu,
Mitlin David
Publication year - 2019
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201970075
Subject(s) - capacitor , potassium , overpotential , sodium , anode , ion , materials science , carbon fibers , chemistry , composite material , electrode , electrochemistry , voltage , electrical engineering , composite number , metallurgy , organic chemistry , engineering
A hard carbon ion insertion anode gives much higher overpotential with K + vs Na + . This significantly lowers the energy–power of symmetric hybrid potassium ion capacitors (KICs) vs sodium ion capacitors (NICs). However, high surface area, ion adsorption carbon works well with both K and Na, opening the possibility for high performance symmetric KICs. In article number 1802272, Mengqiang Wu, David Mitlin, and co‐workers provide a direct performance comparison of potassium ion capacitors versus the better‐known sodium ion capacitors.