Hydrothermal Pre-Carbonization Triggers Structural Reforming Enabling Pore-Tunable Hierarchical Porous Carbon for High-Performance Supercapacitors

Hydrothermal Pre-Carbonization Triggers Structural Reforming Enabling Pore-Tunable Hierarchical Porous Carbon for High-Performance Supercapacitors

The engineering of pore structures has great significance in the development of high-performance carbon-based supercapacitor electrode materials. Herein, we have successfully transformed jujube pits into hierarchical porous carbon (HJPC-4) with excellent capacitive properties via a unique hydrotherm...

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Bibliographic Details
Main Authors: Cuihua Kang, Mingyuan Zuo, Chang Qiu, Fanda Zeng, Yuehui Wang, Zhuo Chen, Tingting Liang, Daping Qiu
Format: Article
Language:English
Published: MDPI AG 2024-12-01
Series:Batteries
Subjects:
hierarchical porous carbon
jujube pit
hydrothermal pretreatment
KOH activation
supercapacitor
Online Access:https://www.mdpi.com/2313-0105/11/1/7
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Summary:The engineering of pore structures has great significance in the development of high-performance carbon-based supercapacitor electrode materials. Herein, we have successfully transformed jujube pits into hierarchical porous carbon (HJPC-4) with excellent capacitive properties via a unique hydrothermal–carbonization–activation strategy. Hydrothermal pretreatment is essential to regulate the supermesoporous and macroporous structure of samples and their superior electrochemical performances. Owing to the large ion-accessible, remarkable supermesoporous and macroporous pore volume, HJPC-4 exhibited ultra-high specific capacitance (6 M KOH: 316 F g<sup>−1</sup> at 1 A g<sup>−1</sup>; EMIMBF<sub>4</sub>: 204 F g<sup>−1</sup> at 1 A g<sup>−1</sup>), excellent rate performance (6 M KOH: 231 F g<sup>−1</sup> at 100 A g<sup>−1</sup>; EMIMBF<sub>4</sub>: 154 F g<sup>−1</sup> at 30 A g<sup>−1</sup>), outstanding cycling stability (6 M KOH: the retention rate is 92.11% after 60,000 cycles at 10 A g<sup>−1</sup>; EMIMBF<sub>4</sub>: the retention rate is 80% after 10,000 cycles at 5 A g<sup>−1</sup>), and ultimate energy/power density up to 91.09 Wh kg<sup>−1</sup>/24.25 kW kg<sup>−1</sup> in EMIMBF<sub>4</sub> two-electrode systems. This work presents unique insights into the effect of the pore structure of carbon-based materials on their capacitive energy storage.
ISSN:2313-0105

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