期刊
JOURNAL OF POWER SOURCES
卷 542, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2022.231743
关键词
Hierarchical porous carbon; Redox electrolyte; Zinc-ion hybrid capacitor
资金
- National Natural Science Foundation of China [51872005, 52072002, U2003216]
- WanJiang Scholar Program
This research reports on the synthesis of N/P co-doped monolithic hierarchical porous carbon (NPMC) materials for zinc-ion hybrid capacitors (ZHCs). The NPMC materials exhibit excellent electron conduction and a well-developed porous structure. The introduction of ZnI2 into the electrolyte significantly increases the capacity of ZHCs.
Zinc-ion hybrid capacitors (ZHCs) are of great potential as a new type of energy storage device, yet how to increase the energy density remains a challenge, which is greatly restricted by cathode materials and electrolytes. Herein, we report on the synthesis of N/P co-doped monolithic hierarchical porous carbon (NPMC) materials from fluorene molecules via template-guided growth coupled with in situ activation strategy. The as-prepared NPMCs feature 3D carbonaceous framework with good electron conduction, well-developed macro/meso/micropores for ion transfer and tunable N/P species with additional pseudocapacity. Meanwhile, the introduction of ZnI2 into aqueous ZnSO4 electrolyte helps to significantly increase the capacity of ZHC due to the redox reactions. It has been demonstrated that the Zn//ZnSO4/ZnI2//NPMC ZHC with NPMC as cathode material delivers an ultrahigh energy density of 324.8 Wh kg(-1), which is 3.5 times higher than Zn//ZnSO4//NPMC ZHC. The mechanisms for this superb performance have been explored in terms of the Zn2+ cations deposition/stripping, SO42-/I- anions adsorption/desorption, Zn4SO4(OH)(6)center dot 0.5H(2)O precipitation/dissolution and the redox reactions (3I(-)/I-3(-), 2I(-)/I-2). This novel work may pave a way to the exploration of high-energy ZHCs.
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