Tailoring of porous and nitrogen-rich carbons derived from hydrochar for high-performance supercapacitor electrodes

Gao, Feng; Shao, Guanghua; Qu, Jiangying; Lv, Siyuan; Li, Yuqian; Wu, Mingbo

doi:10.1016/j.electacta.2014.12.069

Cited by 162 publications

(67 citation statements)

References 46 publications

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“…The maximum P and E values of 12.6 kW kg −1 and 8.58 Wh kg −1 , respectively, are achieved at 30 and 1 A g −1 , respectively. The P value obtained is comparable with the results of tobacco rod derived carbon, 2D microporous carbon, porous phosphorus‐doped carbon, hierarchical porous carbons, reduced graphite oxide, and porous and nitrogen‐rich carbons …”

Section: Resultssupporting

confidence: 80%

Hierarchical Hybrids Integrated by Dual Polypyrrole‐Based Porous Carbons for Enhanced Capacitive Performance

Chen

et al. 2017

Chemistry A European J

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Architectural design of nitrogenous polymer-based carbons represents a facile and efficient strategy to improve performance because of their morphological diversity, tailorability, and N-containing structure. In this research, 0D and 1D forms of polypyrrole-derived porous carbons (A-PCS and A-PCT, respectively) are first integrated into nitrogen-doped hierarchically porous A-PCS/PCT hybrids by applying an easy multistep method. This integration, along with chemical activation, prevents serious agglomeration of carbon particles or tubes and creates a connected porous network structure, leading to improved textural properties (high surface area of 1684 m g , high pore volume of 1.57 cm g , and hierarchical porosity). Thus, A-PCS/PCT hybrids in a three-electrode setup reach high specific capacitances of 224 and 206 F g at 1 and 20 A g , respectively, with high rate capability (92 % capacitance retention). A symmetrical supercapacitor with A-PCS/PCT electrodes presents the highest power and energy densities of 12.6 kW kg and 8.58 Wh kg , respectively, and exceptional cycling life and stability with 92.4 % retention for up to 20 000 cycles. This study on conductive polymer-based hybrid materials may guide the design of architectures with new structures for applications in energy storage and conversion technologies.

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Section: Resultssupporting

confidence: 80%

Hierarchical Hybrids Integrated by Dual Polypyrrole‐Based Porous Carbons for Enhanced Capacitive Performance

Chen

et al. 2017

Chemistry A European J

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“…6d shows the Ragone plot related to energy and power densities of HSC-3//HSC-3 symmetric supercapacitor. It is obvious that the symmetric supercapacitor exhibits the maximum energy density of 30.5 Wh kg -1 at a power density of 181.2 W kg -1 and remained 6.4 Wh kg -1 at a higher power density of 30 866.4 W kg -1 , which is higher than most of the previously reported carbon-based symmetric supercapacitors in aqueous electrolytes, [55][56][57][58][59][60] and also superior to the commercial devices (<3 Wh Kg -1 ). 61 More importantly, the as-assembled HSC-3//HSC-3 symmetric supercapacitor exhibits capacitance retention of 95 % after 10,000 cycles (Fig.…”

Section: Resultsmentioning

confidence: 82%

Three-dimensional honeycomb-like hierarchically structured carbon for high-performance supercapacitors derived from high-ash-content sewage sludge

et al. 2015

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Three-dimensional honeycomb-like hierarchical structured carbon was synthesized from high-ash-content sewage sludge and exhibited remarkable specific capacitance and excellent long-term cycling stability for high-performance supercapacitors.In this work we demonstrate that three--dimensional honeycomb--like hierarchical structured carbon (HSC) can be prepared by using high--ash--content sewage sludge as carbon precursor for the first time. The fly--silicon process acts a crucial role in the formation of honeycomb--like hierachical structures. The as--resulted HSC exhibits novel honeycomb--like framework, high specific surface area (2839 m 2 g --1 ), large pore volume (2.65 cm 3 g --1 ), interconnected hierarchical porosity, and excellent electrochemical performance. The high specific capacitance of 379 F g --1 as well as excellent rate capability and outstanding cycling stability (over 90% capacitance retention after 20,000 cycles even at a high current density of 20 A g --1 ), makes it suitable for high--performance supercapacitor electrode materials. The assembled HSC//HSC symmetric supercapacitor presents an enhanced supercapacitive behavior with high energy density of 30.5 Wh kg --1 in aqueous solution. The strategy provides an effective method to achieve high--performance electrode materials derived from other high--ash--content biomass wastes for supercapacitors.

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“…It is generally believed that the KOH activation process of any carbon material enhances the pore structure and morphology with a substantial increase in specific surface area [14]. [18] -614 Orange peel [19] CO 2 618 Glucose [20] KOH 1197 Palm date seed [21] NaOH 1282 Desert shrub [22] ZnCl 2 1296 Rice husk [23] H 3 PO 4 1498 Hazelnut shell [24] KOH 1700 Glucose [25] KOH 1704 Sucrose [26] H 3 PO 4 2120 Glucose [26] NaOH 2129 Starch [27] KOH 2190 Rye straw [28] KOH 2200 Eucalyptus sawdust [29] KOH 2252 Corncobs [30] KOH 2300 Hemp bast fiber (this study) KOH 2425 Figure 1 provides the N 2 adsorption-desorption isotherms at −196 • C and pore size distributions of HAC, where HACs were prepared using different biochar-to-KOH ratios at a synthesis temperature of 390 • C. All the adsorption-desorption isotherms exhibit a type IV isotherm with a type IV hysteresis loop (according to IUPAC classification) in the relative pressure range from 0.4 to 1.0. Type IV isotherms are an indication of the existence of well-developed mesopores in the structure, whereas a type IV hysteresis loop indicates the formation of asymmetric, slit-shaped mesopores, attributable to rapid gas evolution and open channels [31].…”

Section: Resultsmentioning

confidence: 99%

High-Surface-Area Mesoporous Activated Carbon from Hemp Bast Fiber Using Hydrothermal Processing

Hossain

et al. 2018

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Synthesis of activated carbon from waste biomass is of current interest towards sustainability. The properties of biomass-derived activated carbon largely depend on the carbonization process. This study reports the preparation of mesoporous activated carbon with extremely high surface area from hemp bast fiber using hydrothermal processing. Hot water processing (390-500 • C) followed by activation using KOH and NaOH was investigated at different mass ratios. The described approach was found to enhance the mesoporosity (centered at 3.0 to 4.5 nm) of the hemp-derived activated carbon (HAC) from activation [confirmed by BJH (Barrett-Joyner-Halenda) pore size distribution and TEM (transmission electron microscopy) imaging]. BET (Brunauer-Emmett-Teller) results showed that the product has an extremely high surface area (2425 m 2 /g) while the surface functional groups (-OH, -COOH, C=C/C-C) were confirmed by FTIR (Fourier transform infrared spectroscopy) and further quantified by XPS (X-ray photoelectron spectroscopy). Increasing KOH concentration was found to enhance the surface area with a maximum biochar-to-KOH (g/g) ratio of 1:3. The crystallite domain size of HAC was determined using Raman spectroscopy of different wavelengths. The procedure described in this study is an environmentally friendly scalable route for the mass production of activated carbon using hemp fiber.

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Tailoring of porous and nitrogen-rich carbons derived from hydrochar for high-performance supercapacitor electrodes

Cited by 162 publications

References 46 publications

Hierarchical Hybrids Integrated by Dual Polypyrrole‐Based Porous Carbons for Enhanced Capacitive Performance

Hierarchical Hybrids Integrated by Dual Polypyrrole‐Based Porous Carbons for Enhanced Capacitive Performance

Three-dimensional honeycomb-like hierarchically structured carbon for high-performance supercapacitors derived from high-ash-content sewage sludge

High-Surface-Area Mesoporous Activated Carbon from Hemp Bast Fiber Using Hydrothermal Processing

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