Self‐template porous carbon by direct activation of
            <scp>high‐ash</scp>
            coal liquefaction residue for
            <scp>high‐rate</scp>
            supercapacitor electrodes

Wang, Xianglong; Li, Yizhao; Yang, Chao; Cao, Yali; Su, Xintai; Tahir, Muhammad Usman

doi:10.1002/er.6096

Cited by 23 publications

(8 citation statements)

References 64 publications

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“…Besides, even under the extremely high power density of 27,000 W kg –1 , the supercapacitor is still able to maintain a very high energy density of 9.0 W h kg –1 . The performance can rival or even surpass that reported previously in the literature for symmetric supercapacitors assembled from other porous carbon materials synthesized by chemical activation methods and template methods (color dots in Figure c). ,,,,,− Figure d displays the energy supply demonstration of the as-assembled HPC-20 based symmetric supercapacitor device using a 1 M Na 2 SO 4 electrolyte. Two devices charged to 1.8 V connected in series have the power to light up a green light-emitting diode (LED) lamp, proving that the HPC-20 has tremendous potential for energy storage applications.…”

Section: Resultsmentioning

confidence: 72%

Continuous and Scalable Manufacture of Coal-Derived Hierarchical Porous Carbon Dominated with Mesopores for High Rate-Performance Supercapacitors

Wang,

Li,

Wang

et al. 2024

ACS Appl. Energy Mater.

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The continuous and scalable manufacture of porous carbon electrode materials with controlled pore architecture holds paramount importance in the development of efficient and sustainable energy storage systems. Herein, a green and industrially feasible physical activation strategy was proposed to produce heteroatom self-doped hierarchical porous carbons (HPCs) by using polyvinyl butyral (PVB) as a sacrificial template and cross-linking agent and low-rank coal as a lowcost precursor. The optimal HPC-20 has highly interconnected multiscale pore structure, large specific surface area, and heteroatomenriched surfaces. The synergistic effect of these advantages provides HPC-20 with a variety of benefits, including fast charge/discharge rates and abundant energy storage sites. Specifically, HPC-20 exhibited an appreciable specific capacitance of 304 F g −1 at 0.5 A g −1 and an excellent rate performance (capacitance retention of 65.8% at 50 A g −1 ). Furthermore, the symmetric supercapacitor achieved a maximum energy density of 23.1 W h kg −1 at a power density of 450 W kg −1 in 1 M Na 2 SO 4 electrolytes. This work proposes an approach for the large-scale production of porous carbon with a controllable pore structure from low-rank coal.

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Section: Resultsmentioning

confidence: 72%

Continuous and Scalable Manufacture of Coal-Derived Hierarchical Porous Carbon Dominated with Mesopores for High Rate-Performance Supercapacitors

Wang,

Li,

Wang

et al. 2024

ACS Appl. Energy Mater.

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“…3 Meanwhile, the remaining residue from lignite alcoholysis could be an excellent carbon precursor for supercapacitors, especially EDLCs, because it contains highly condensed aromatic rings and a large amount of OCFGs. Wang et al 25 prepared selftemplate porous carbon with a hierarchically porous structure using coal liquefaction residue (CLR) activated by KOH, which showed a specific surface area of 1787.2 m 2 g −1 and a specific capacitance of up to 250 F g −1 at 1 A g −1 . Qin et al 26 used asphaltene from CLR to produce porous carbon nanosheets with controlled thickness and graphite-like ribbon structure, which had a high specific capacitance of 282.9 F g −1 at a high current density of 100 A g −1 , and maintained 89.6% specific capacitance after 10,000 cycles.…”

Section: Introductionmentioning

confidence: 99%

Efficient Two-Step Utilization of Organic Matter in Shengli Lignite for Producing Chemicals and Supercapacitor Electrode Materials

et al. 2023

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Conversion of organic matter in lignite into chemicals and high-performance carbon materials is a promising approach for clean and efficient utilization of lignite. Herein, Shengli lignite (SL) is subjected to supercritical ethanolysis, followed by ultrasonic extraction with isometric carbon disulfide/ acetone for separating SL into soluble organic matters (SOMs) and insoluble extraction residue (ER) with highly condensed aromatic structures. According to the analyses with gas chromatography/ mass spectrometry (GC/MS) and Orbitrap MS, the SOMs were mainly composed of oxygen-containing compounds, such as arenols, aliphatic esters, and aromatic esters, which can be used as feedstock for producing value-added chemicals. The ER was used as a carbon precursor to produce three-dimensional porous carbon materials (PCMs) through precarbonization and activation with KOH using nano-ZnO as an in situ template. The prepared PCMs possessed high stability, large specific surface area, and abundant oxygen-doped carbon, showing a high specific capacitance of 300 F g −1 at 0.5 A g −1 in a three-electrode system, and the capacitance retention was 100% after 10,000 cycles of charge and discharge at 5 A g −1 in a two-electrode system.

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“…[ 6 , 7 ]. At present, the research on liquefaction residue mainly focuses on the gasification [ 5 , 8 , 9 , 10 ], pyrolysis [ 11 , 12 , 13 ], combustion [ 14 ] and preparation of functional carbon materials [ 15 , 16 , 17 ]. However, it is not hard to find a common feature in applied research in these fields.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Electrochemical Desulfurization of Coal Liquefaction Residue

Jiang

Zhang

et al. 2023

Molecules

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The occurrence of sulfur in coal direct liquefaction residue affects its further high quality and high value utilization. Electrochemical desulfurization is characterized by mild reaction conditions, simple operation, easy separation of sulfur conversion products and little influence on the properties of the liquefied residue. An anodic electrolytic oxidation desulphurization experiment was carried out on the liquefaction residue of the by-product of a coal-to-liquid enterprise in the slurry state. An electrochemical test and material characterization of raw materials before and after electrolysis showed that electrolytic oxidation can desulfurize the liquefaction residue under an alkaline condition. Linear sweep voltammetry (LSV) was used for the electrolysis experiments to obtain the optimal slurry concentration of 60 g/L. On this basis, the reaction kinetics were calculated, and the minimum activation energy in the interval at 0.9 (V vs. Hg/HgO) was 19.71 kJ/mol. The relationship between the electrolytic desulfurization of the liquefied residue and energy consumption was studied by the potentiostatic method. The influence of anodic potential and electrolytic temperature on the current density, cell voltage, desulfurization rate and energy consumption was investigated. The experimental results showed that the desulfurization rate and total energy consumption increase positively with the increase in reaction temperature and electrolytic potential in a certain range. The influence of the reaction temperature on the desulfurization rate and total energy consumption is more prominent than that of electrolytic potential, but the energy consumption of sulfur removal per unit mass does not show a positive correlation. Therefore, with the energy consumption per unit mass of sulfur removal as the efficiency index, the optimal experimental results were obtained: under the conditions of 0.8 (V vs. Hg/HgO) anode potential, 50 °C electrolytic temperature, 60 g/L slurry concentration and 14,400 s electrolytic time, the desulfurization rate was 18.85%, and the power consumption per unit mass of sulfur removal was 5585.74 W·s/g. The results of XPS, SEM, BET and IC showed that both inorganic and organic sulfur were removed by electrolytic oxidation, and the morphology, pore structure and chemical bond of the liquefied residue were affected by electrolytic oxidation. The research method provides a new idea and reference for the efficiency evaluation of desulfurization and hydrogen production from coal liquefaction residue.

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Self‐template porous carbon by direct activation of high‐ash coal liquefaction residue for high‐rate supercapacitor electrodes

Abstract: Effective utilization of the wasted high-ash coal liquefaction residue (CLR) becomes increasingly important with the fast development of the coal chemical industry. Herein, a self-template porous carbon is prepared using CLR as

Cited by 23 publications

References 64 publications

Continuous and Scalable Manufacture of Coal-Derived Hierarchical Porous Carbon Dominated with Mesopores for High Rate-Performance Supercapacitors

Continuous and Scalable Manufacture of Coal-Derived Hierarchical Porous Carbon Dominated with Mesopores for High Rate-Performance Supercapacitors

Efficient Two-Step Utilization of Organic Matter in Shengli Lignite for Producing Chemicals and Supercapacitor Electrode Materials

Experimental Study on Electrochemical Desulfurization of Coal Liquefaction Residue

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