Integrating surface functionalization and redox additives to improve surface reactivity for high performance supercapacitors

Zhai, Duo Duo; Líu, Hao; Wang, Min; Wu, Di; Chen, Xiang Ying; Zhang, Zhong Jie

doi:10.1016/j.electacta.2019.134810

Cited by 31 publications

(12 citation statements)

References 61 publications

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“…In that way, we ensure that Si does not come in direct contact with the electrolyte while also increasing its conductivity, which would greatly contribute to its power density. An additional benefit of depositing a polymer on the electrodes’ surface is its contribution to charge storage performance through redox reactions. − Having pseudocapacitive contributions resulting from the aforementioned redox reactions would help increase the supercapacitor’s energy density and its overall performance. , Further, if we expose the deposited polymer to thermal treatment in order to obtain activated carbon, this has also proven to increase the performance of supercapacitors. − …”

Section: Introductionmentioning

confidence: 99%

In-Depth Analysis of Porous Si Electrodes for Supercapacitors

et al. 2021

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Supercapacitors have presented promising results in energy storage until now, making them a possible candidate for becoming a mainstream rechargeable power source, which could be easily integrated in portable devices. Si itself, due to its prominence, would be a suitable candidate as a material for electrodes. Despite their performances, they still present shortcomings when put against batteries; hence, a lot of focus is put on increasing the performance of supercapacitors. Starting with its capacitance, we have opted for an increase in the active surface obtained through the porosification of the aforementioned Si electrodes to obtain a higher capacitance and better performances, as well as coating the presented electrodes for a pseudocapacitive contribution in addition. This article presents a study done on the effects the porosification of Si electrodes has on their electrical performance.

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Section: Introductionmentioning

confidence: 99%

In-Depth Analysis of Porous Si Electrodes for Supercapacitors

et al. 2021

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“…The results show that the electrode has favorable kinetics and high power capacitance performance in the KOH electrolyte. The energy density and power density of the device is summarized in the Ragone plot of Figure f, which shows a high energy density of 17.13 Wh kg −1 at the power density of 900 W kg −1 , and much higher than other previously reported materials such as ANCLCNFs, NFMCNFs, C‐blank, Z‐HPAC, CLCNF/PANi, HGPC‐A, N,S‐GLC, NPCs and other carbon materials related symmetrical devices . In contrast, the energy density of the device in KOH solution is only 7.15 Wh kg‐1, which is less than half that in Na 2 SO 4 solution, and smaller in H 2 SO 4.…”

Section: Resultsmentioning

confidence: 75%

“… The devices: (a) CV curves in 6 M KOH, (b) CV curves in 1 M Na 2 SO 4 , (c) CV curves in 1 M H 2 SO 4 , (d) electrochemical impedance spectroscopy, (e) bode plots (inset is the time constants, τ) in different electrolytes, and (f) Ragone plot in different electrolytes and the comparison with other reported works ANCLCNFs, NFMCNFs, C‐blank, Z‐HPAC, CLCNF/PANi, HGPC‐A N,S‐GLC, NPCs …”

Section: Resultsmentioning

confidence: 93%

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Design of Ultra‐Microporous Carbons by Interpenetrating MF Prepolymer into PAAS Networks at Molecule Level for Enhanced Electrochemical Performance

Gao

Chen

et al. 2020

ChemElectroChem

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The pore structure control of porous carbons, especially ultramicroporous carbons, has long been a great challenge, and it is desirable to propose new strategies to deal with this dilemma. Herein, we designed and obtained ultra-microporous dominant porous carbon materials (UMC-IPNs) with an unimodal pore diameter of 0.6 nm by the strategy of interpenetrating polymer networks precursor carbonization. Thanks to the intertwining characteristics of the two interpenetrating polymer networks, the microphase separation which often occurs between the polymers is well suppressed, and also the pores of the as-obtained ultra-microporous carbons are interconnected. The calculated specific surface area is 1551 m 2 g À 1 . Furthermore, as electrode material, UMC-IPNs has been confirmed to have exceptional electrochemical performance (the specific capacitance is 268 F g À 1 at 0.5 A g À 1 , and after 10,000 cycles, the capacity is 96 % of the original at 6 A g À 1 ) and rapid electrochemical kinetics (the surface capacitance effect ratio is about 85.4 % in our calculation results). In addition, ultra-microporous carbons are interesting for other applications such as gas capture, catalysis, and sensor technology.

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“…To date, various methods have been reported to enhance the electrochemical performance of the porous ACs. For instance, the introduction of oxygen functional groups (ketone, ether, carboxylic acid, quinone, and so on) by oxidizing the porous carbon surface could promote the hydrophilicity and also surface reactivity of the carbon material [ 17 , 18 , 19 ]. Moreover, the presence of the surface oxygen-containing species not only provides some pseudo capacitance effect but also enriches the surface wetting capability which contributes a significant improvement in the capacitance and the overall specific energy/power of the carbon electrode material [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Behavior of Peanut-Shell Activated Carbon/Molybdenum Oxide/Molybdenum Carbide Ternary Composites

et al. 2021

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Biomass-waste activated carbon/molybdenum oxide/molybdenum carbide ternary composites are prepared using a facile in-situ pyrolysis process in argon ambient with varying mass ratios of ammonium molybdate tetrahydrate to porous peanut shell activated carbon (PAC). The formation of MoO2 and Mo2C nanostructures embedded in the porous carbon framework is confirmed by extensive structural characterization and elemental mapping analysis. The best composite when used as electrodes in a symmetric supercapacitor (PAC/MoO2/Mo2C-1//PAC/MoO2/Mo2C-1) exhibited a good cell capacitance of 115 F g−1 with an associated high specific energy of 51.8 W h kg−1, as well as a specific power of 0.9 kW kg−1 at a cell voltage of 1.8 V at 1 A g−1. Increasing the specific current to 20 A g−1 still showcased a device capable of delivering up to 30 W h kg−1 specific energy and 18 kW kg−1 of specific power. Additionally, with a great cycling stability, a 99.8% coulombic efficiency and capacitance retention of ~83% were recorded for over 25,000 galvanostatic charge-discharge cycles at 10 A g−1. The voltage holding test after a 160 h floating time resulted in increase of the specific capacitance from 74.7 to 90 F g−1 at 10 A g−1 for this storage device. The remarkable electrochemical performance is based on the synergistic effect of metal oxide/metal carbide (MoO2/Mo2C) with the interconnected porous carbon. The PAC/MoO2/Mo2C ternary composites highlight promising Mo-based electrode materials suitable for high-performance energy storage. Explicitly, this work also demonstrates a simple and sustainable approach to enhance the electrochemical performance of porous carbon materials.

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Integrating surface functionalization and redox additives to improve surface reactivity for high performance supercapacitors

Cited by 31 publications

References 61 publications

In-Depth Analysis of Porous Si Electrodes for Supercapacitors

In-Depth Analysis of Porous Si Electrodes for Supercapacitors

Design of Ultra‐Microporous Carbons by Interpenetrating MF Prepolymer into PAAS Networks at Molecule Level for Enhanced Electrochemical Performance

Enhanced Electrochemical Behavior of Peanut-Shell Activated Carbon/Molybdenum Oxide/Molybdenum Carbide Ternary Composites

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