Mesoporous manganese oxide with large specific surface area for high-performance asymmetric supercapacitor with enhanced cycling stability

Gu, Jianmin; Fan, Xiaoyong; Liu, Xin; Li, Siheng; Wang, Zhuang; Tang, Shoufeng; Yuan, Deling

doi:10.1016/j.cej.2017.05.014

Cited by 87 publications

(29 citation statements)

References 48 publications

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“…For example, the bands near 3650 cm −1 were assigned to the O−H groups [34]. The bands in the 1900-1600 cm −1 range were involved in the superposition of aromatic C=C and C=O stretching vibrations in the carboxyl, ester, lactone, and carbonyl groups [35,36]. The bands in the 1000-1300 cm −1 range were assigned to the C-O single-bond stretching vibrations from the phenols, epoxide structures, aromatic ethers, and lactone groups [35,37].…”

Section: Ftir Analysis and Possible Degradation Mechanismmentioning

confidence: 99%

Degradation of phenol using a combination of granular activated carbon adsorption and bipolar pulse dielectric barrier discharge plasma regeneration

Tang

2018

Plasma Sci. Technol.

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A combined method of granular activated carbon (GAC) adsorption and bipolar pulse dielectric barrier discharge (DBD) plasma regeneration was employed to degrade phenol in water. After being saturated with phenol, the GAC was filled into the DBD reactor driven by bipolar pulse power for regeneration under various operating parameters. The results showed that different peak voltages, air flow rates, and GAC content can affect phenol decomposition and its major degradation intermediates, such as catechol, hydroquinone, and benzoquinone. The higher voltage and air support were conducive to the removal of phenol, and the proper water moisture of the GAC was 20%. The amount of H 2 O 2 on the GAC was quantitatively determined, and its laws of production were similar to phenol elimination. Under the optimized conditions, the elimination of phenol on the GAC was confirmed by Fourier transform infrared spectroscopy, and the total removal of organic carbons achieved 50.4%. Also, a possible degradation mechanism was proposed based on the HPLC analysis. Meanwhile, the regeneration efficiency of the GAC was improved with the discharge treatment time, which attained 88.5% after 100 min of DBD processing.

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Section: Ftir Analysis and Possible Degradation Mechanismmentioning

confidence: 99%

Degradation of phenol using a combination of granular activated carbon adsorption and bipolar pulse dielectric barrier discharge plasma regeneration

Tang

2018

Plasma Sci. Technol.

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“…The CV curve of the OR4 electrode at 2–50 mV s –1 is shown in Figure b and those of others are shown in Figure S4. As the scanning rate increased, the redox peaks disappeared but the CV curves remained unchanged even at the scan rate of up to 50 mV s –1 , indicating the good rate capability and low resistance, which was attributed to the fast charge transport in the materials. , Two charge storage mechanisms for manganese oxide electrodes have been proposed . The first mechanism was the adsorption–desorption of the cations on the surface of the MnO x electrode, which resulted in the formation of an electrical double-layer capacitance and generally occurred at a rapid scanning rate.…”

Section: Resultsmentioning

confidence: 99%

Over-Reduction-Controlled Mixed-Valent Manganese Oxide with Tunable Mn²⁺/Mn³⁺ Ratio for High-Performance Asymmetric Supercapacitor with Enhanced Cycling Stability

Fang

et al. 2021

Langmuir

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Manganese oxides composed of various valence states Mn x+ (x = 2, 3, and 4) have attracted wide attention as promising electrode materials for asymmetric supercapacitor. However, the poor electrical conductivity limited their performance and application. Appropriate regulation content of Mn x+ in mixed-valent manganese oxide can tune the electronic structure and further improve their conductivity and performance. Herein, we prepared manganese oxides with different Mn2+/Mn3+ ratios through an over-reduction (OR) strategy for tuning the internal electron structure of mixed-valent manganese, which could make these material oxides a good platform for researching the structure–property relationships. The Mn2+/Mn3+ ratio of manganese oxide could be precisely tuned from 0.6 to 1.7 by controlling the amount of reducing agent for manipulating the redox processes, where the manganese oxide electrode with the most appropriate Mn2+/Mn3+ ratio, as 1.65 (OR4) exhibits large capacitance (274 F g–1) and the assembling asymmetric supercapacitors by combining OR4 (positive) and the commercial activated carbon (as negative) achieved large 2.0 V voltage window and high energy density of 27.7 Wh kg–1 (power density of 500 W kg–1). The cycle lifespan of the OR4//AC could keep about 92.9% after 10 000-cycle tests owing to the Jahn–Teller distortion of the Mn(III)O6 octahedron, which is more competitive compared to other work. Moreover, a red-light-emitting diode (LED) can easily be lit for 15 min by two all-solid supercapacitor devices in a series.

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“…And they exhibit similar values with asymmetric supercapacitors with large voltage window such as graphene//MGC (2.0 V, 30.4 Wh kg À 1 ) [31] , AC//MnO 2 (1.8 V, 17 Wh kg À 1 ) [32] , p-BC@MnO 2 -2 h//p-BC/N-5 M (2.0 V, 32.9 Wh kg À 1 ), [33] and AC//ORA300-MnO x -2 (1.7 V, 32 Wh kg À 1 ). [34] The excellent energy storage performance of NPC-MnOOH-4//NPC-MnOOH-4 symmetric device can be ascribed to the high voltage and large specific capacitance.…”

Section: Resultsmentioning

confidence: 99%

Symmetric Supercapacitors Based on MnOOH‐Coated Nanoporous Carbon toward High Energy‐Storage Performance

et al. 2019

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Pseudocapacitors, one of the most efficient types of energy storage devices due to their high specific capacitance, could not provide adequate information for real applications with a half‐cell device. Therefore, this contribution describes the facile synthesis of hybrid materials based on nanoporous carbon (NPC) and MnOOH with outstanding capacitive performance in symmetric devices. Interconnected NPC with large surface area served as a conductive substrate for deposition of tunable amounts of MnOOH. NPC‐MnOOH electrodes can be scanned with a wide voltage window from 0 to 1.6 V without obvious hydrolysis. The two‐electrode supercapacitor NPC‐MnOOH//NPC‐MnOOH with 26.7 wt% of MnOOH shows the highest specific capacitance of 410 F g−1 and a maximum energy density of 33.5 Wh kg−1. It also shows 86 % retention even after 10 000 cycles. The beneficial properties proved the hybrid materials are suitable for a high‐voltage industrial device under optimal conditions.

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Mesoporous manganese oxide with large specific surface area for high-performance asymmetric supercapacitor with enhanced cycling stability

Cited by 87 publications

References 48 publications

Degradation of phenol using a combination of granular activated carbon adsorption and bipolar pulse dielectric barrier discharge plasma regeneration

Degradation of phenol using a combination of granular activated carbon adsorption and bipolar pulse dielectric barrier discharge plasma regeneration

Over-Reduction-Controlled Mixed-Valent Manganese Oxide with Tunable Mn²⁺/Mn³⁺ Ratio for High-Performance Asymmetric Supercapacitor with Enhanced Cycling Stability

Symmetric Supercapacitors Based on MnOOH‐Coated Nanoporous Carbon toward High Energy‐Storage Performance

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Mesoporous manganese oxide with large specific surface area for high-performance asymmetric supercapacitor with enhanced cycling stability

Cited by 87 publications

References 48 publications

Degradation of phenol using a combination of granular activated carbon adsorption and bipolar pulse dielectric barrier discharge plasma regeneration

Degradation of phenol using a combination of granular activated carbon adsorption and bipolar pulse dielectric barrier discharge plasma regeneration

Over-Reduction-Controlled Mixed-Valent Manganese Oxide with Tunable Mn2+/Mn3+ Ratio for High-Performance Asymmetric Supercapacitor with Enhanced Cycling Stability

Symmetric Supercapacitors Based on MnOOH‐Coated Nanoporous Carbon toward High Energy‐Storage Performance

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Over-Reduction-Controlled Mixed-Valent Manganese Oxide with Tunable Mn²⁺/Mn³⁺ Ratio for High-Performance Asymmetric Supercapacitor with Enhanced Cycling Stability