High-energy quasi-solid-state supercapacitors enabled by carbon nanofoam from biowaste and high-voltage inorganic gel electrolyte

Mi, Hongyu; Gao, Song; Mi, Hongyu; Lei, Chenchen; Ji, Chenchen; Xie, Zhiyuan; Yu, Chang; Qiu, Jieshan

doi:10.1016/j.carbon.2019.04.056

Cited by 97 publications

(36 citation statements)

References 62 publications

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“…The gravimetric specific capacitance of KMPC declines from 335 to 238 F g −1 (71% retention) at 1 A g −1 , and from 246 to 138 F g −1 (56% retention) at 30 A g −1 as the mass loading increase from 5 to 16 mg cm −2 (Figure 4E). The above values are better than previous reported porous carbons, graphene, and graphene composites [45][46][47][48][49][50] due to the rational SSA and mesopore volume. As seen in Figure 4F, the areal capacitance increases linearly with mass loading gradually increase, suggesting the large mesopore volume and effective SSA is favorable for the ionic transport and storage.…”

Section: Resultscontrasting

confidence: 64%

A dual‐activation strategy to tailor the hierarchical porous structure of biomass‐derived carbon for ultrahigh rate supercapacitor

Guo

Luo

et al. 2021

Int J Energy Res

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Suffering from the competitive relationship between the abundant electrochemically active sites and the fast ion transfer channel, it still faces tremendous challenges in simultaneously designing and preparing biomass-derived carbons with excellent capacitive and rate performance. Herein, a dual-activation strategy of KOH and KMnO 4 is used to prepare cotton stalks-derived porous carbon with large specific surface area (SSA) (1634 m 2 g −1 ), interconnected network structure, as well as rational mesopores and micropore ratio. Consequently, the obtained sample exhibits an ultrahigh specific capacitance of 318 F g −1 at 1 A g −1 , 71% capacitance retention at current density up to 50 A g −1 , and only 2% capacitance dissipation in a two-electrode system in 6 M KOH after 10 000 cycles. Importantly, the obtained sample also shows a high areal capacitance of 3.8 F cm −2 under a high mass loading of 16 mg cm −2 . Moreover, the obtained sample also delivers a high energy density of 19.9 Wh kg −1 at 397 W kg −1 in the symmetric two-electrode system using 1 M Na 2 SO 4 aqueous electrolyte. This work provides an alternative avenue for the facile and scaled-up conversion of earth-abundant agricultural wastes into advanced carbon materials for supercapacitors application.

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Section: Resultscontrasting

confidence: 64%

A dual‐activation strategy to tailor the hierarchical porous structure of biomass‐derived carbon for ultrahigh rate supercapacitor

Guo

Luo

et al. 2021

Int J Energy Res

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“…[ 4,13,43,49–54 ] Remarkably, electrode materials with high areal capacity are highly required for miniaturized electronics. [ 55,56 ] However, the sluggish kinetics of active materials in thick electrodes greatly hinder their practical applications. Encouraged by its 1D nanostructure and promising performance of V 2 O 5 · x H 2 O cathode, we performed Zn–G//V 2 O 5 · x H 2 O ZIBs with various active mass loading from 0.8 to 14 mg cm −2 .…”

Section: Resultsmentioning

confidence: 99%

Pencil Drawing Stable Interface for Reversible and Durable Aqueous Zinc‐Ion Batteries

Dong

et al. 2020

Adv Funct Materials

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146

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Zinc‐ion batteries (ZIBs) have been regarded as one of the most promising aqueous energy storage devices due to their low‐cost, high capacity, and intrinsic safety. However, the relatively low Coulombic efficiency caused by the dendrite formation and side reactions greatly hinders the rejuvenation of ZIBs. Here, an utterly simple approach by pencil drawing is employed to improve the poor performance of normal Zn anode and hinders the formation of passivated byproduct as well as serious dendrite growth. Significantly, the functional graphite layer can not only act as ions buffer, but also guide the uniform nucleation of Zn2+ in graphite voids. With such synergy effect, the graphite‐coated Zn anode (Zn–G) displays low overpotential, high reversibility, and dendrite‐free durability compared with the pristine Zn. Consequently, a low voltage hysteresis of ≈28 mV can be achieved and maintained over 200 h. Furthermore, the Zn–G anode is paired with a V2O5·xH2O cathode to construct a rechargeable ZIB. As‐assembled device can output high energy/power density of 324.3 Wh kg−1/3269.8 W kg−1 (based on the active mass loading in cathode) together with a capacity retention of ≈84% over 1500 cycles at a current density of 5 A g−1.

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“…X‐ray powder diffraction (XRD) patterns were used to confirm the attribution of the as‐obtained samples. In Figure 2c, the broad peaks locating at ≈21.4° are consistent with the (002) planes of carbon, which illustrates the amorphous nature of the produced samples [10b,11] . Furthermore, the Raman spectra in Figure 2d displays two obvious peaks attributed to the D band (1340 cm −1 ) and G band (1590 cm −1 ), which can be used to represent the disorder region and graphitization of porous carbon [10a,12] .…”

Section: Resultsmentioning

confidence: 70%

“…Notably, the TGA curve in Figure 1b with two obvious weight‐loss stages, which correspond to the melting (stage I, 210–270 °C) and carbonization (stage II, 400–500 °C) of the ZDMA, respectively, confirms its relatively high carbon yield (≈42% at 800 °C). In general, it is difficult for the carbon yield of various precursors such as polymers, biomass, and other organics to exceed 30%, [ 10 ] further suggesting the great potential of ZDMA in carbon preparation. Moreover, the remarkably different morphologies of the pristine ZC and the optimized ZC‐mK 2 CO 3 were investigated by a field emission scanning electron microscope (FESEM) and profiled in Figure 1.…”

Section: Resultsmentioning

confidence: 99%

Tailored Hierarchical Porous Carbon through Template Modification for Antifreezing Quasi‐Solid‐State Zinc Ion Hybrid Supercapacitors

Chen

et al. 2021

Adv Energy and Sustain Res

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Aqueous zinc ion hybrid supercapacitors (ZHSCs) have emerged and are regarded as promising candidates for energy storage due to their environmental friendlessness and cost‐effectiveness. However, the development of a satisfying positive electrode with high performance still poses challenges. Herein, a hierarchical porous carbon with a fast‐ion‐transport feature is rationally reported via a facile template modification strategy. By adjusting the content of the template, the physiochemical characteristics and microstructures of carbon can be reasonably optimized. As proof of concept, the produced carbon electrode can deliver a high specific capacitance of 294.8 F g−1 at a current density of 0.2 A g−1, long cycling stability with ≈100% capacitance retention over 20 000 cycles, and a maximum power density of 13.2 kW kg−1 at 30.8 W h kg−1. Significantly, a superior areal capacitance of 3390 mF cm−2 is offered with a mass loading of 21 mg cm−2. When coupled with a unique antifreezing hydrogel electrolyte, the constructed quasi‐solid‐state ZHSC can not only endure −15 °C, but also exhibits outstanding durability and an ultralow self‐discharging rate, demonstrating its potential prospect for extreme conditions. This work may bring light on the preparation of carbon materials and the fabrication of multifunctional devices.

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High-energy quasi-solid-state supercapacitors enabled by carbon nanofoam from biowaste and high-voltage inorganic gel electrolyte

Cited by 97 publications

References 62 publications

A dual‐activation strategy to tailor the hierarchical porous structure of biomass‐derived carbon for ultrahigh rate supercapacitor

A dual‐activation strategy to tailor the hierarchical porous structure of biomass‐derived carbon for ultrahigh rate supercapacitor

Pencil Drawing Stable Interface for Reversible and Durable Aqueous Zinc‐Ion Batteries

Tailored Hierarchical Porous Carbon through Template Modification for Antifreezing Quasi‐Solid‐State Zinc Ion Hybrid Supercapacitors

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