Journal
SMALL
Volume 18, Issue 16, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202108057
Keywords
foaming strategy; mesoporous carbon nanosheets; monoliths; nitrogen doping; zinc ion hybrid capacitors
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Funding
- LiaoNing Revitalization Talents Program [XLYC2007129]
- Natural Science Foundation of Liaoning Province [2020-MS-095]
- Fundamental Research Funds for the Central Universities of China [N2105008]
- State Key Laboratory of Fine Chemicals [KF1911]
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In this study, a urea-mediated foaming strategy was used to synthesize nitrogen-enriched mesoporous carbon nanosheets (NPCNs) for aqueous zinc ion hybrid capacitors (aZHCs). The NPCNs exhibited high specific capacity and areal capacity, making them suitable for large-scale energy storage and flexible wearable devices.
Aqueous zinc ion hybrid capacitors (aZHCs) are of great potential for large-scale energy storage and flexible wearable devices, of which the specific capacity and energy density need to be further enhanced for practical applications. Herein, a urea-mediated foaming strategy is reported for the efficient synthesis of monoliths consisting of nitrogen-enriched mesoporous carbon nanosheets (NPCNs) by prefoaming drying a solution made of polyvinylpyrrolidone, zinc nitrate, and urea at low temperatures, foaming and annealing at high temperatures, and subsequent acid etching. NPCNs have a large lateral size of approximate to 40 mu m, thin thickness of approximate to 55 nm, abundant micropores and mesopores (approximate to 3.8 nm), and a high N-doping value of 9.7 at.%. The NPCNs as the cathode in aZHCs provide abundant zinc storage sites involving both physical and chemical adsorption/desorption of Zn(2+ )ions, and deliver high specific capacities of 262 and 115 mAh g(-1) at 0.2 and 10 A g(-1), and a remarkable areal capacity of approximate to 0.5 mAh cm(-2 ) with a mass loading of 5.3 mg cm(-2), outperforming most carbon cathodes reported thus far. Moreover, safe and flexible NPCNs based quasi-solid-state devices are fabricated, which can withstand drilling and mechanical bending, suggesting their potential applications in wearable devices.
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