Hierarchical porous carbon derived from coal and biomass for high performance supercapacitors

Zhang, Xiaoyun; Sun, Bing; Fan, Xing; Liang, Peng; Zhao, Guoming; Saikia, Binoy K.; Wei, Xian‐Yong

doi:10.1016/j.fuel.2021.122552

Cited by 73 publications

(15 citation statements)

References 39 publications

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“…In Figure S7b, the GCD curves at various current densities show almost symmetrical triangles, which suggests that the supercapacitor has a high Coulombic efficiency and excellent electrochemical reversibility. Figure S7c depicts the Ragone plot of the symmetrical device, and the energy density is as high as 9.64 Wh kg –1 at a power density of 100 W kg –1 , which is significantly higher than previously reported in the literature. ,,− Meanwhile, the supercapacitor shows excellent cycling stability, as illustrated in Figure S7d. The capacitance retention and Coulomb efficiency after 10,000 cycles at 2 A g –1 are 77.1 and 100%, respectively.…”

Section: Results and Discussionmentioning

confidence: 77%

Efficient Fabrication of Hierarchical Porous Carbon Fibers with Tunable Mesopores from Discarded Aramid for Supercapacitors

Wang,

Liu,

Wang

et al. 2023

ACS Appl. Energy Mater.

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Template-free synthesis of advanced supercapacitor carbon with tunable interpenetrating micromesoporous structures remains a formidable challenge. Herein, porous carbon fibers with tunable mesopores were fabricated that were derived from discarded aramid fibers by H3PO4-assisted KOH activation without a template. The structural design of porous carbon fibers was achieved by utilizing the dehydration condensation reaction of H3PO4 with the amide groups in the aramid chain segments, which developed primary pores of porous carbon fibers and further facilitated K+ etching and embedding during subsequent KOH activation. The derived porous carbon fibers exhibited extremely tremendous specific surface area, abundant tunable mesopores, and N/O enriched surface. Benefiting from the synergy of the unique hierarchical porous structure and surface characteristics, the optimized porous carbon fiber provided an extremely high specific capacitance of 434.8 F g–1 at 0.2 A g–1 in a 6 M KOH electrolyte and excellent rate performance. Furthermore, in a 1 M Na2SO4 electrolyte, the assembled symmetric aqueous supercapacitor device displayed an ultrahigh energy density of 25.26 Wh kg–1 at a corresponding power density of 450 W kg–1, as well as remarkable cycling stability.

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Section: Results and Discussionmentioning

confidence: 77%

Efficient Fabrication of Hierarchical Porous Carbon Fibers with Tunable Mesopores from Discarded Aramid for Supercapacitors

Wang,

Liu,

Wang

et al. 2023

ACS Appl. Energy Mater.

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“…As illustrated in Figure b, the C 1s high-resolution spectrum of a-AER 500 was fitted into three peaks: C–C (284.8 eV), CC (285.3 eV), and C–O (288.7 eV) . The O 1s spectrum can be assigned to three OCFGs as presented in Figure c: C–O (533.3 eV), CO (532.1 eV), and O–H (535.3 eV) . The N 1s was deconvoluted into three peaks: pyridinic N (N-6, 398.5 eV), quaternary N (N-5, 400.3 eV), and oxidized pyridinic N (N-X, 403.5 eV), as shown in Figure d.…”

Section: Resultsmentioning

confidence: 99%

“…46 The O 1s spectrum can be assigned to three OCFGs as presented in Figure 8c: C−O (533.3 eV), C�O (532.1 eV), and O−H (535.3 eV). 47 The N 1s was deconvoluted into three peaks: pyridinic N (N-6, 398.5 eV), quaternary N (N-5, 400.3 eV), and oxidized pyridinic N (N-X, 403.5 eV), 48 as shown in Figure 8d. The surface element compositions of all PCMs are listed in Table S1.…”

Section: Characterization Of Pcms From Aermentioning

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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“…Moreover, low-rank coals are rich in oxygen atoms, which can realize oxygen self-doping during the preparation of porous carbon. The introduction of oxygen-containing functional groups can improve the wettability of the material, thus enhancing the energy storage effect of coal-based porous carbon electrodes. ,− However, coal is generally harder and possesses relatively few natural pores compared with biomass, which does not facilitate the diffusion of activators into the interior of the particles during the activation process. Apart from being capable of causing serious ablation of surface and collapse of pore structure, it also exacerbates the difficulties of multiscale pore structure development of porous carbon. , Furthermore, as a consequence of the inhomogeneous activation, the porous carbon typically possesses a low specific surface area and pore volume, which are not conducive to charge storage and electrolyte diffusion, thereby reducing the specific capacitance and energy density.…”

Section: Introductionmentioning

confidence: 99%

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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Hierarchical porous carbon derived from coal and biomass for high performance supercapacitors

Cited by 73 publications

References 39 publications

Efficient Fabrication of Hierarchical Porous Carbon Fibers with Tunable Mesopores from Discarded Aramid for Supercapacitors

Efficient Fabrication of Hierarchical Porous Carbon Fibers with Tunable Mesopores from Discarded Aramid for Supercapacitors

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

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

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