Molten metal chloride salt template synthesis of N/S co-doped porous carbon nanosheets for supercapacitors

Zhang, Wei; Lin, Min; Cheng, Rongrong; Li, Lele; Sun, Yaxin; Ran, Songlin; Lv, Yaohui; Ma, Lianbo

doi:10.1016/j.diamond.2021.108278

Cited by 44 publications

(17 citation statements)

References 43 publications

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“…Moreover, the energy densities of CBPC also outperformed some that had been reported (8.6 Wh kg –1 @ 250 W kg –1 ) (Table S3). − In addition, the specific capacitance just slightly decreased after 10,000 cycles, which retained 93% in initial capacitance and nearly 100% in Coulombic efficiency at 5 A g –1 (Figure h).…”

Section: Resultsmentioning

confidence: 94%

Dual-Salt-Induced Hierarchical Porous Structure in a Carbon Sheet for High Performance Supercapacitors

Feng

Guo

et al. 2023

Langmuir

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Porous carbon, one of the characteristic materials for electrochemical energy storage devices, has been paid wide-ranging attention. However, balancing the reconcilable mesopore volume with a large specific surface area (SSA) was still a challenge. Herein, a dual-salt-induced activation strategy was developed to obtain a porous carbon sheet with ultrahigh SSA (3082 m 2 g −1 ), desirable mesopore volume (0.66 cm 3 g −1 ), nanosheet morphology, and high surface O (7.87%) and S (4.0%) content. Hence, as a supercapacitor electrode, the optimal sample possessed a high specific capacitance (351 F g −1 at 1 A g −1 ) and excellent rate performance (holding capacitance up to 72.2% at 50 A g −1 ). Furthermore, the assembled zinc-ion hybrid supercapacitor also exhibited superior reversible capacity (142.7 mAh g −1 at 0.2 A g −1 ) and highly stable cycling (71.2 mAh g −1 at 5 A g −1 after 10,000 cycles with retention of 98.9%). This work was delivered a new possibility for the development of coal resources for the preparation of high performance porous carbon materials.

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Section: Resultsmentioning

confidence: 94%

Dual-Salt-Induced Hierarchical Porous Structure in a Carbon Sheet for High Performance Supercapacitors

Feng

Guo

et al. 2023

Langmuir

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“…Figure f presents the Ragone plots of symmetrical supercapacitor based on the MPCN-800 electrodes in different electrolytes. The symmetrical device can deliver an energy density of 10.2 Wh kg –1 at the power density of 0.13 kW kg –1 , and this value can be maintained down to 8.2 Wh kg –1 at 5.3 kW kg –1 in 6 M KOH electrolyte, which is comparable to some recently reported carbon electrodes, such as HGPC-A (7.0 Wh kg –1 at 128 W kg –1 ), 0.75PCNS 800 (5.2 Wh kg –1 at 26.72 W kg –1 ), WPCNS 12 (9.93 Wh kg –1 at 28 W kg –1 ), ACN S -2 (8.9 Wh kg –1 at 90.3 W kg –1 ), NSHPC-700 (6.89 Wh kg –1 at 250.55 W kg –1 ), and HPGC 0.6–700 (7.9 Wh kg –1 at 494 W kg –1 ) . Impressively, the symmetrical device can provide the maximum specific energy density of 31.5 Wh kg –1 at a specific power density of 0.31 kW kg –1 and preserves a value of 13.0 Wh kg –1 , even at 11.98 kW kg –1 in organic electrolytes.…”

Section: Resultsmentioning

confidence: 99%

Multilayer-Dense Porous Carbon Nanosheets with High Volumetric Capacitance for Supercapacitors

Che

Liu

Wang

et al. 2022

Ind. Eng. Chem. Res.

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Two-dimensional (2D) porous carbon materials with large specific surface area (SSA) and high packing density are promising candidates for supercapacitors but still a major challenge. Herein, a simple 2D space-confined method was proposed to fabricate multilayer-dense porous carbon nanosheets (MPCN) by taking advantage of the stacking effect from rapid-drying MgAllayered double hydroxides (MgAl-LDH). It is found that the addition of MgAl-LDH plays a vital role in improving the sample yield and packing density of porous carbon materials, in comparison to that prepared by the traditional activation strategy. The obtained MPCN-800 sample demonstrates a large SSA of 2111 m 2 g −1 with a high volumetric density of ca. 0.85 g cm −3 , which enables outstanding gravimetric and volumetric specific capacitance of 374 F g −1 and 318 F cm −3 , respectively, at a current density of 0.5 A g −1 as the electrode for supercapacitor. Furthermore, a symmetric two-electrode device was assembled with MPCN-800 sample for evaluating its practical application. It has a high charge-storage performance of 292 F g −1 and superior rate capability in aqueous electrolyte, meanwhile exhibiting a specific capacitance of 145 F g −1 under a voltage window of 2.5 V and a maximum energy density of 31.5 Wh kg −1 at an output power of 313 W kg −1 in organic electrolytes. The present work provides a novel and promising strategy to prepare porous carbon materials with high volumetric density for high-performance supercapacitors.

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“…In the low frequency range, the Nyquist plot of the ACW@RGO electrode shows a line with a large slop and it is more inclined to the vertical axis than other samples, demonstrating a good ionic conductivity and reversibility. [38] At the high frequencies, all samples show negligible semicircles and the smallest semicircle diameter is observed for the ACW@RGO electrode, suggesting its best electrical conductivity. [27] These EIS results authenticate that the ACW@RGO can effectively endow fast electron and ion transport at the electrode/electrolyte interface due to its porous structure and excellent hydrophilicity.…”

Section: Electrochemical Performances Of Single Acw@rgo Electrodementioning

confidence: 89%

“…Last but not least, the resultant products could be effectively cleaned by washing to remove the activators and their by-products. [38] Zhang et al reported a multi-step activation method with KOH, CO 2 and HNO 3 as activation agents to obtain a porous wood-based carbon electrode with a large specific surface area of 703.5 m 2 g À 1 and the single electrode exhibited a remarkable electrochemical performance of 285.6 F g À 1 and a high energy density of 38.0 mWh cm À 3 . [37] Currently, it is still challenging for thick electrodes to simultaneously possess high areal capacitance, high ionic and electronic conductivities, and less tortuosity.…”

Section: Introductionmentioning

confidence: 99%

Wood‐Derived Monolithic Ultrathick Porous Carbon Electrodes Filled with Reduced Graphene Oxide for High‐Performance Supercapacitors with Ultrahigh Areal Capacitances

Dai

et al. 2021

ChemElectroChem

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A monolithic ultrathick and dense carbon electrode with high specific surface area and high hydrophilicity is fabricated for high-performance supercapacitors with ultrahigh areal capacitance by infiltration of graphene oxide inside the aligned pores of the wood followed by lyophilization, carbonization, thermal reduction at 800 °C, and activation with KOH. The porous and vertical microchannels in the wood-derived carbon facilitate the transport of ions and electrons, while the presence of reduced graphene oxide provides the electrode with high specific surface area, high electrochemical stability, and compactness. Benefiting from the efficient pores resulted from the KOH activation, the monolithic electrode exhibits a high specific surface area of 1049.9 m 2 g À 1 with an enhanced permeability, and remains its primary structure as a freestanding electrode without the use of conductive additives or binders. Consequently, the directly sliced pellet electrode with a thickness of 2.2 mm delivers a high areal capacitance of 26.6 F cm À 2 at a current density of 1 mA cm À 2 in 6 M KOH electrolyte. The resultant symmetrical supercapacitor with a KOH gel electrolyte reaches an energy density of 0.91 mWh cm À 2 and a maximum power density of 11.90 W cm À 2 .

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Molten metal chloride salt template synthesis of N/S co-doped porous carbon nanosheets for supercapacitors

Cited by 44 publications

References 43 publications

Dual-Salt-Induced Hierarchical Porous Structure in a Carbon Sheet for High Performance Supercapacitors

Dual-Salt-Induced Hierarchical Porous Structure in a Carbon Sheet for High Performance Supercapacitors

Multilayer-Dense Porous Carbon Nanosheets with High Volumetric Capacitance for Supercapacitors

Wood‐Derived Monolithic Ultrathick Porous Carbon Electrodes Filled with Reduced Graphene Oxide for High‐Performance Supercapacitors with Ultrahigh Areal Capacitances

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