Hierarchical porous graphitized carbon xerogel for high performance supercapacitor

Ling, Chen; Deng, Junqian; Yang, Yuan; Hong, Shu; Yan, Bing; He, Shuijian; Lian, Hailan

doi:10.1016/j.diamond.2021.108781

Cited by 14 publications

(14 citation statements)

References 72 publications

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“…The absence of pores in the mesopore sizes from 2 to 4 nm in this electrode may be the reason for the inaccessibility of the pores at high current density. The specific capacitance obtained in this study is much higher compared to the values reported in literature for RF derived carbon-gels (aerogels/cryogels/xerogels) synthesised with a solvent exchange step prior to drying for retaining pores [ 17 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 ], and comparable to the recent studies [ 46 , 47 , 48 , 49 ] using KOH electrolyte.…”

Section: Resultssupporting

confidence: 83%

Revisiting the Effect of Pyrolysis Temperature and Type of Activation on the Performance of Carbon Electrodes in an Electrochemical Capacitor

et al. 2022

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Hierarchical porous carbons are known to enhance the electrochemical features of electrodes in electrochemical capacitors. However, the contribution of surface oxygen and the resulting functionalities and wettability, along with the role of electrical conductivity and degree of amorphous or crystalline nature in the micro-mesoporous carbons, are not yet clear. This article considers the effect of carbonisation temperature (500–900 °C) and the type of activation (CO2, KOH) on the properties mentioned above in case of carbon xerogels (CXs) to understand the resulting electrochemical performances. Depending on the carbonisation temperature, CX materials differ in micropore surface area (722–1078 m2 g−1) while retaining a mesopore surface area ~300 m2 g−1, oxygen content (3–15%, surface oxygen 0–7%), surface functionalities, electrical conductivity (7 × 10−6–8 S m−1), and degree of amorphous or crystalline nature. Based on the results, electrochemical performances depend primarily on electrical conductivity, followed by surface oxygen content and meso-micropore connectivity. The way of activation using a varied extent of CO2 exposure and KOH concentrations played differently in CX in terms of pore connectivity from meso- to micropores and their contributions and degree of oxidation, and resulted in different electrochemical behaviours. Such performances of activated CXs depend solely on micro-mesopore features.

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Section: Resultssupporting

confidence: 83%

Revisiting the Effect of Pyrolysis Temperature and Type of Activation on the Performance of Carbon Electrodes in an Electrochemical Capacitor

et al. 2022

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“…However, this achieved level of stability and capacitive retention could be enforced by the incorporation of the CX surface with functional groups such as nitrogen, oxygen, or both, to support the non-faradaic mechanism with faradaic reactions, which stabilize the capacitance at high current densities. 43 This hopefully will be considered and investigated in the future scope of this work.…”

Section: Resultsmentioning

confidence: 98%

Novel preparation of metal-free carbon xerogels under acidic conditions and their performance as high-energy density supercapacitor electrodes

Abbas,

Abdelwahab,

Abdel-Samad

et al. 2023

Nanoscale Adv.

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“…It was known that type I isotherms possessed pore sizes mainly less than 2 nm, as calculated by the DFT model, which is in accordance with the PSD curves and the average pore size (D aver ) portrayed in Figure 4 d and Table 1 . On the contrary, type IV isotherms had porous carbons with different pore sizes, which is favorable for electron and ion diffusion, thereby endowing enhanced electrochemical performance [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

In Situ Self-Assembly of Nitrogen-Doped 3D Flower-like Hierarchical Porous Carbon and Its Application for Supercapacitors

Qiu,

Liu,

et al. 2024

Molecules

Self Cite

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The hierarchical porous carbon-based materials derived from biomass are beneficial for the enhancement of electrochemical performances in supercapacitors. Herein, we report the fabrication of nitrogen-doped 3D flower-like hierarchical porous carbon (NPC) assembled by nanosheets using a mixture of urea, ZnCl2, and starch via a low-temperature hydrothermal reaction and high-temperature carbonization process. As a consequence, the optimized mass ratio for the mixture is 2:2:2 and the temperature is 700 °C. The NPC structures are capable of electron transport and ion diffusion owing to their high specific surface area (1498.4 m2 g−1) and rich heteroatoms. Thereby, the resultant NPC electrodes display excellent capacitive performance, with a high specific capacitance of 249.7 F g−1 at 1.0 A g−1 and good cycling stability. Remarkably, this implies a superior energy density of 42.98 Wh kg−1 with a power density of 7500 W kg−1 in organic electrolyte for the symmetrical supercapacitor. This result verifies the good performance of as-synthesized carbon materials in capacitive energy storage applications, which is inseparable from the hierarchical porous features of the materials.

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Hierarchical porous graphitized carbon xerogel for high performance supercapacitor

Cited by 14 publications

References 72 publications

Revisiting the Effect of Pyrolysis Temperature and Type of Activation on the Performance of Carbon Electrodes in an Electrochemical Capacitor

Revisiting the Effect of Pyrolysis Temperature and Type of Activation on the Performance of Carbon Electrodes in an Electrochemical Capacitor

Novel preparation of metal-free carbon xerogels under acidic conditions and their performance as high-energy density supercapacitor electrodes

In Situ Self-Assembly of Nitrogen-Doped 3D Flower-like Hierarchical Porous Carbon and Its Application for Supercapacitors

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