Harvesting honeycomb-like carbon nanosheets with tunable mesopores from mild-modified coal tar pitch for high-performance flexible all-solid-state supercapacitors

Zhang, Guoli; Guan, Taotao; Cheng, Miao; Wang, Yongxia; Xu, Nengneng; Qiao, Jinli; Xu, Feifei; Wang, Yuzi; Wang, Jianlong; Li, Kaixi

doi:10.1016/j.jpowsour.2019.227446

Cited by 54 publications

(26 citation statements)

References 77 publications

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“…The ratio of I 1460 /I 1380 is used to evaluate the length of alkyl side chains of aromatic molecules. 50 I 1460 and I 1380 are the peak intensities of the methylene group (∼1460 cm −1 ) and the methyl group (∼1380 cm −1 ), respectively. The I Ar and I 1460 / I 1380 ratio are 0.53 and 1.03 for HPC 1/3 , respectively, suggesting that HPC 1/3 possesses a relatively larger aromatic nucleus and longer side chains.…”

Section: Resultsmentioning

confidence: 99%

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Building Relationships between Molecular Composition of Carbon Precursor and Capacitance of a Hierarchical Porous Carbon-Based Supercapacitor

Zhang

Sun

Fan

et al. 2021

ACS Appl. Energy Mater.

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A series of carbon precursors were obtained via the co-thermal dissolution of coal and wheat straw (WS) with different weight ratios. Three-dimensional hierarchical porous carbon (HPC X ) materials were prepared from the carbon precursors. Among the porous carbon materials, HPC 1/3 (WS:coal = 1:3 in weight) showed a specific capacitance of 384 F g −1 at 1 A g −1 in 6 M KOH and a good retention capability of 92% at a current density of 10 A g −1 . A symmetrical supercapacitor was further fabricated using HPC 1/3 for both electrodes. The supercapacitor exhibited an excellent cycle lifetime, retaining 98% of specific capacitance after 10 000 cycles. The excellent electrochemical performance of HPC 1/3 is closely related to the corresponding composition of the carbon precursor. Gas chromatography/mass spectrometry and Orbitrap mass spectrometry were used to reveal the detailed composition of carbon precursors at the molecular level. The N-containing and O-containing compounds in carbon precursors are helpful for the enhancement of capacity, surface polarity, and electrical conductivity. Aromatic compounds with a high unsaturation in a carbon precursor contribute to the high specific capacitance and cycling stability.

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Section: Resultsmentioning

confidence: 99%

“…As a semiquantitative method, the aromaticity index ( I Ar ) is often used to reveal the degree of aromatization, which is calculated according to eq S1 shown in the Supporting Information. The ratio of I 1460 / I 1380 is used to evaluate the length of alkyl side chains of aromatic molecules …”

Section: Results and Discussionmentioning

confidence: 99%

Building Relationships between Molecular Composition of Carbon Precursor and Capacitance of a Hierarchical Porous Carbon-Based Supercapacitor

Zhang

Sun

Fan

et al. 2021

ACS Appl. Energy Mater.

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“…Until now, carbon materials are regarded as the primary choice to assemble flexible SC electrodes because of high chemical inertness, good conductivity, large specific surface, and easy accessibility. , Diverse precursors, such as biomass, − polymer, − and coal-based materials, − have been used for fabricating carbon materials. Owing to the combined features of low-cost, high carbon content, and natural abundance, coal-based materials have drawn considerable attention in recent years. − Among these coal-based materials, thermoplastic pitch, as a byproduct of the coal coking industry, with various kinds of polycyclic aromatic hydrocarbons is harmful to the environment but also advantageous when used as a precursor to fabricate carbonaceous materials because of the virtue of high carbon yield and considerably low cost . Layered-porous carbon, honeycomb-like carbon nanosheets, and graphene nanocapsules derived from pitch have been fabricated for SC application.…”

Section: Introductionmentioning

confidence: 99%

Flexible Cross-Linked Electrospun Carbon Nanofiber Mats Derived from Pitch as Dual-Functional Materials for Supercapacitors

Tian

Song

et al. 2020

Energy Fuels

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Freestanding and binder-free electrospun carbon nanofiber mats with a cross-linked structure (CLCF) were fabricated by using pitch as the precursor. The cross-linked structure can be tuned easily by controlling the preoxidation degree of electrospun nanofibers. This cross-linking strategy can not only convert low value pitch into economical efficient energy storage materials but also reduce contact resistance and enhance ion diffusion kinetics of the as-obtained CLCF by reducing the fiber diameter, balancing porous structure, and conductivity. The CLCF electrode with a moderate preoxidation degree exhibits remarkable rate performance (160 F g–1 at 100 A g–1, 85.6% of its initial capacity at 1 A g–1) in 6 M KOH aqueous electrolyte, compared with carbon nanofibers without and with an overdose of cross-linked structure. Moreover, as a scaffold for depositing NiMoO4, impressive electrochemical performance can be achieved. The assembled asymmetrical device based on CLCF and NiMoO4-anchored CLCF delivers a stable working voltage of 1.6 V with a high energy output of 14.9 Wh kg–1 and a maximum power density of 14.3 kW kg–1. The intriguing electrochemical performance can be credited to the cross-linked fibrous structure that endows the CLCF with rapid ion diffusion kinetics and fast electron transfer as well as robust structural stability to bear the volume fluctuation of NiMoO4 during the repeated charge/discharge process. Therefore, our work provides a new strategy to design high performance carbon nanofiber mats with a cross-linked structure as a dual-functional material for supercapacitor devices by using pitch.

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“…R520 is composed of alternating layers as shown in Figure 1 e. Similar structures can be seen in the literature, prepared at higher carbonization temperatures [14, 21] . The unique laminated structure is beneficial to improve the electrochemical performance of the material, owing to its promoting effect for lithium ion intercalation and deintercalation.…”

Section: Resultsmentioning

confidence: 60%

“…prepared a pitch‐based porous carbon with stacked layers through a complicated multi‐step synthesis including sulfonation and heat treatment (700 °C) [14] . It has been demonstrated that pitch can be transformed into laminated nanostructures through a thermal process in excess of 700 °C [21] . The transformation under these thermal conditions is attributed to the release of small molecules and the plane adjustment of large molecules formed by the polymerization of aromatic rings in the pitch.…”

Section: Introductionmentioning

confidence: 99%

Pitch‐Based Laminated Carbon Formed by Pressure Driving at Low Temperature as High‐Capacity Anodes for Lithium Energy Storage Systems

Yang

Song

Tian

et al. 2020

Chemistry A European J

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Pitch hasb een used to prepare electrodes by high-temperature heat treatments for supercapacitors, lithium-ion batteries, on account of its rich aromatic ring structure. Here, the toluene-soluble component of pitch is used to prepare ak ind of laminated carbon.T his was realized by at emplate-free synthesis at low temperature with the addition of pressure. Thet oluene-soluble component has as mall molecular weight, which makes the thermal deformation ability stronger and then enhances the orientation of the carbon layer with the help of pressure. The prepared anode exhibits as plendid electrochemical performance compared with the traditional graphite anode. Ah igh stable capacity of approximately 550 mAh g À1 at 50 mA g À1 ,w hich is much higher than graphite (372 mAh g À1), is obtained. Also, when the current density is up to 2Ag À1 ,t he capacity is about 150 mAh g À1 .S urprisingly,i ta lso delivers as uperior cycling performance. And when used as the anode/cathode electrode for lithium-ion capacitors, ah igh energy density can be obtained. The present work offers an opportunity to utilize the pitch source in lithium energy storagew ith promising cycle life, high energy/power density,a nd low cost.

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Harvesting honeycomb-like carbon nanosheets with tunable mesopores from mild-modified coal tar pitch for high-performance flexible all-solid-state supercapacitors

Cited by 54 publications

References 77 publications

Building Relationships between Molecular Composition of Carbon Precursor and Capacitance of a Hierarchical Porous Carbon-Based Supercapacitor

Building Relationships between Molecular Composition of Carbon Precursor and Capacitance of a Hierarchical Porous Carbon-Based Supercapacitor

Flexible Cross-Linked Electrospun Carbon Nanofiber Mats Derived from Pitch as Dual-Functional Materials for Supercapacitors

Pitch‐Based Laminated Carbon Formed by Pressure Driving at Low Temperature as High‐Capacity Anodes for Lithium Energy Storage Systems

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