A dual‐activation strategy to tailor the hierarchical porous structure of biomass‐derived carbon for ultrahigh rate supercapacitor

Guo, Renhe; Guo, Nannan; Luo, Wanxia; Zhou, Doudou; Ma, Rui; Sheng, Rui; Guo, Jixi; Jia, Dianzeng; Wang, Luxiang

doi:10.1002/er.6458

Cited by 18 publications

(7 citation statements)

References 64 publications

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“…38,39 The geometrical characteristics of porous ACs (average pore width, pore size distribution, and pore geometry) play important roles in the electrochemical performances of AC-based SCs. 1,8,[40][41][42][43] For example, micropores furnish the adsorption sites for electrolyte ions, and mesopores provide fast pathways for ionic migration. 44 The morphology of ACs can also impact the electrochemical behavior of the ACs.…”

Section: Introductionmentioning

confidence: 99%

“…It is known that ACs of porous structures are preferred for the applications of ACs in SCs 38,39 . The geometrical characteristics of porous ACs (average pore width, pore size distribution, and pore geometry) play important roles in the electrochemical performances of AC‐based SCs 1,8,40‐43 . For example, micropores furnish the adsorption sites for electrolyte ions, and mesopores provide fast pathways for ionic migration 44 .…”

Section: Introductionmentioning

confidence: 99%

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High‐performance activated carbons for supercapacitor: Effects of porous structures, heteroatom doping, and morphology

Cai

Ren

Sun

et al. 2021

Intl J of Energy Research

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In this work, we prepare a series of activated carbons (ACs) of different morphologies, porous structures, and oxygen contents from glucose with hydrothermal synthesis (HTS) followed by a one-step (H 2 O-steam or KOH) or two-step (H 2 O-steam-KOH or KOH-H 2 O-steam) activation. The largest surface area of the prepared ACs is more than 3400 m 2 /g, and the corresponding mesopore volume is 1.21 cm 3 /g. The fraction of oxygen in the ACs varies in a range of 3.94 to 9.9 at%. The electrochemical performance of the symmetric supercapacitor cells (SCs) made from the as-prepared ACs is characterized in different aqueous electrolytes. The optimum capacitance of the SCs is 421 F/g at 0.5 A/g and 304 F/g at 10 A/g. The oxygen-enriched functional groups have limited contribution to the energy storage for the SCs with neutral electrolyte and profound effects on the increase of the energy storage for the SCs with strong acidic and alkaline electrolytes. The processing routes developed in this work likely open an avenue to tailor the structures and oxygen-enriched functional groups of ACs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐performance activated carbons for supercapacitor: Effects of porous structures, heteroatom doping, and morphology

Cai

Ren

Sun

et al. 2021

Intl J of Energy Research

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“…[129] Therefore, they treated shrimp shells with ChCl/TsOH to selectively prepare chitin and chitin-derived carbon materials by adjusting the temperature. When shrimp shells were treated with 15 wt% ChCl/TsOH (1:2) for 3 h, chitin [120] Copyright 2021, Wiley-VCH.…”

Section: Chitin-derived Pcmentioning

confidence: 99%

“…Guo et al fabricated the carbon electrodes by the dual activation strategy of KOH and KMnO 4 , and good electrochemical performance was obtained in two aqueous electrolytes (6 m KOH and 0.5 m Na 2 SO 4 ). [120] Therefore, aqueous electrolytes are favored by most researchers under high mass-loading.…”

Section: ) Electrolytesmentioning

confidence: 99%

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High Mass‐Loading Biomass‐Based Porous Carbon Electrodes for Supercapacitors: Review and Perspectives

Yang

Qiu

2023

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Biomass‐based porous carbon (BPC) with renewability and flexible nano/microstructure tunability has attracted increasing attention as efficient and cheap electrode materials for supercapacitors. To meet commercial needs, high mass‐loading electrodes with high areal capacitance are preferred when designing supercapacitors. The increased mass percentage of active materials can effectively improve the energy density of supercapacitors. However, as the thickness of the electrode increases, it will face the following challenges including severely blocked ion transport channels, poor charging dynamics, poor electrode structural stability, and complex preparation processes. A bridge between theoretical research and practical applications of BPC electrodes for supercapacitors needs to be established. In this review, the advances of high mass‐loading BPC electrodes for supercapacitors are summarized based on different biomass precursors. The key performance evaluation parameters of the high mass‐loading electrodes are analyzed, and the performance influencing factors are systematically discussed, including specific surface area, pore structure, electrical conductivity, and surface functional groups. Subsequently, the promising optimization strategies for high mass‐loading electrodes are summarized, including the structure regulation of electrode materials and the optimization of other supercapacitor components. Finally, the major challenges and opportunities of high mass‐loading BPC electrodes in the future are discussed and outlined.

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Nitrogen‐Doped Cellulose‐Derived Porous Carbon Fibers for High Mass‐Loading Aqueous Supercapacitors

Lv,

Wang,

Zhang

et al. 2024

ChemSusChem

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Biomass‐based porous carbon with renewability and flexible structure tunability is a promising electrode material for supercapacitors. However, there is a huge gap between experimental research and practical applications. How to maintain good electrochemical performance of high mass‐loading electrodes and suppress the self‐discharge of supercapacitors is a key issue that urgently needs to be addressed. The structure regulation of electrode materials such as heteroatom doping is a promising optimization strategy for high mass‐loading electrodes. In this work, nitrogen‐doped cellulose‐derived porous carbon fibers (N‐CHPCs) were prepared by a facile bio‐template method using cotton cellulose as raw material and urea as dopant. The prepared N‐CHPCs have high specific surface area, excellent hierarchical porous structure, partial graphitization properties and suitable heteroatom content. The assembled high mass‐loading (12.8 mg cm‐2; 245 μm) aqueous supercapacitor has excellent electrochemical performance, i.e., low open‐circuit voltage attenuation rate (21.39 mV h‐1), high voltage retention rate (78.81%), high specific capacitance (295.8 F g‐1 at 0.1 A g‐1), excellent area capacitance (3.79 F cm‐2 at 0.1 A g‐1), excellent cycling stability (97.28% over 20,000 cycles at 1.0 A g‐1). The excellent performance of high mass‐loading N‐CHPCs is of great significance for their practical applications in advanced aqueous supercapacitors.

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A dual‐activation strategy to tailor the hierarchical porous structure of biomass‐derived carbon for ultrahigh rate supercapacitor

Cited by 18 publications

References 64 publications

High‐performance activated carbons for supercapacitor: Effects of porous structures, heteroatom doping, and morphology

High‐performance activated carbons for supercapacitor: Effects of porous structures, heteroatom doping, and morphology

High Mass‐Loading Biomass‐Based Porous Carbon Electrodes for Supercapacitors: Review and Perspectives

Nitrogen‐Doped Cellulose‐Derived Porous Carbon Fibers for High Mass‐Loading Aqueous Supercapacitors

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