Journal
MATERIALS TODAY ENERGY
Volume 17, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2020.100429
Keywords
Metal fluoride; Three-dimensional; Ion exchange; Pseudocapacitor supercapacitor
Funding
- National Natural Science Foundation of China [61775095, 61775089]
- Industrial Alliance Fund of Shandong Provincial Key Laboratory [SDKL2016038]
- 'Taishan scholars' construction special fund of Shandong Province
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Electroactive materials, with high electrochemical activity, are urgently needed for supercapacitors. While it remains a great challenge to integrate high rate capability and outstanding cycling stability simultaneously. Mixed transition metal fluorides with porous structures are regarded as helpful active electrode materials for supercapacitors. Herein, three dimensional porous tri metallic (Ni-Co-M, M = Mn, Fe, Cu, Zn) fluorides were synthesized by reflux condensation and calcination methods. Among them, Ni-Co-Zn fluorides (NCZF) exhibited stronger synergetic electrochemical property compared with other transition metals, contributing a high specific capacitance of 914.4 F/g at 1 A/g and 81.3% capacity retention at 20 A/g and the specific capacitance could maintain 45.6% after 30,000 cycles. The hybrid supercapacitor based on NCZF and activated carbon (AC) electrodes also displayed a specific capacity of 222 F/g at 1 A/g and 90.2 F/g at 20 A/g with ultralong cycling stability (61.9% capacity retention after 10,000 cycles). (c) 2020 Elsevier Ltd. All rights reserved.
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