N-Doped Holey Graphene/Porous Carbon/Cellulose Nanofibers Electrode and Hydrogel Electrolyte for Low-temperature Zinc-ion Hybrid Supercapacitors.

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Tác giả: Baoli Fan, Xin Hou, Yanling Jin, Penggang Ren, Wenhui Tian, Jiayi Wang, Yilan Wang, Tong Wu, Zirui Zhao

Ngôn ngữ: eng

Ký hiệu phân loại:

Thông tin xuất bản: Germany : Small (Weinheim an der Bergstrasse, Germany) , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 690257

The susceptibility to freezing of the electrolyte and mismatched cathode make the aqueous zinc-ion hybrid supercapacitors (ZHSCs) have inferior electrochemical performance at low temperature. Herein, a novel freeze-tolerant hydrogel electrolyte (CEEZ) and matched graphene/porous carbon/cellulose nanofibers cathode (GPCN) are respectively fabricated via chemical cross-linking and a two-step process to assemble ZHSCs. The prepared electrode has a highly porous structure, abundant edge active sites, and increased interlayer spacing, which collectively reduces ion transport complexity and enhances the contact area with the electrolyte, promoting rapid ionic conduction pathways. For the CEEZ, the use of ethylene glycol reduces the saturated vapor pressure of water, thereby enhancing the frost resistance of the hydrogel electrolyte. Consequently, the ZHSCs assembled from GPCN, CEEZ, and Zn anode exhibit excellent specific capacitances of 1.11 F cm⁻
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