Carbon fabric-aligned carbon nanotube/MnO2/conducting polymers ternary composite electrodes with high utilization and mass loading of MnO2 for super-capacitors

Lv, Peng; Feng, Yi; Li, Yu; Feng, Wei

doi:10.1016/j.jpowsour.2012.07.073

Cited by 144 publications

(94 citation statements)

References 48 publications

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“…61,64 Deconvoluted Mn 2p 3/2 peaks at 642.6 and 641.8 eV are attributed to the presence of Mn 4+ and Mn 3+ oxide phases, respectively. [65][66][67] The amount of Mn 4+ and Mn 3+ oxide phases is determined to be 94% and 6%, respectively, which indicates that the dominated oxidation state of manganese oxide in the composites is tetravalent oxide. In addition, the presence of Mn 3+ leads to better electrocatalytic performance due to oxygen defects in the material.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Oxygen Transfer by Design Nickel Foam Electrode for Zinc−Air Battery

Loh

Wang

et al. 2018

J. Electrochem. Soc.

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To develop a long-lifetime metal-air battery, oxygen reduction electrodes with improved mass-transfer routes are designed by adjusting the mass ratio of the hydrophobic polytetrafluoroethylene (PTFE) to carbon nanotubes (CNTs) in nickel foam. The oxygen reduction catalyst MnO 2 is grown on the nickel foam using a hydrothermal method. Scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Brunauer-Emmett-Teller analysis are employed to characterize the morphology, crystal structure, chemical composition, and pore structure of the electrodes, respectively. The air electrodes are evaluated using constant-current tests and electrochemical impedance spectroscopy. A PTFE:CNT mass ratio of 1:4-2:1 with 3-mm-thick nickel foam yields the optimal performance due to the balance of hydrophilicity and hydrophobicity. When the electrodes are applied in primary zinc-air batteries, the electrode with a PTFE:CNT mass ratio of 1:4 achieves the maximum power density of 95.7 mW cm −2 with a discharge voltage of 0.8 V at 100 mA cm −2 , and completes stable discharge for over 14400 s at 20 mA cm Growing global interest in the development of a smart grid and electric vehicles requires long-lifetime, cost-effective, and environmentally friendly batteries, such as zinc-air and lithium-air batteries. Metal-air batteries offer beneficial properties, such as high theoretical energy and power densities, low operating temperature, low cost, and material recyclability.1 In particular, metal-air batteries offer an advantage over other batteries in that the cathode electroactive species (oxygen) is not stored in the battery system but supplied from the surrounding environment during the discharge process. This unique nature simplifies the metal-air battery structure, which leads to a lighter and more compact battery, thereby increasing the specific energy, which approaches 470 and 1700 Wh kg −1 for zinc−air and lithium−air batteries, respectively. 2The oxygen reaction electrode is the core component of metalair batteries, where the oxygen is reduced through multistep electron transfer processes, involving complicated oxygen-containing species such as O, OH, O 2 2− , HO 2 − . [3][4][5][6] It is generally accepted that oxygen reduction may proceed via a four-electron pathway or two-electron pathway. The specific reactions of oxygen reduction reaction (ORR) in alkaline media are as followings:1. In a four-electron pathway, O 2 is reduced to OH − ;2. In a two-electron pathway, O 2 is reduced to peroxide ion followed by either further reduction or disproportionation.The oxygen reduction reaction (ORR) is usually kinetically sluggish relative to the negative metal anode in these batteries, which results in great voltage loss in the ORR cathode and limits battery performance. This behavior can be partially attributed to the low solubility of O 2 of 1.25 mM in aqueous solutions, 7 and 10 −4 mM in 30 wt% KOH at 25• C, 8 which makes it difficult for oxygen to adsorb on the surface of catalysts in the cathode. 9 Oxygen has ...

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Section: Resultsmentioning

confidence: 99%

Enhancement of Oxygen Transfer by Design Nickel Foam Electrode for Zinc−Air Battery

Loh

Wang

et al. 2018

J. Electrochem. Soc.

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“…9,16 Električna vodljivost MnO 2 može se poboljšati i dodatkom vodljivih polimera, 18-27 a ponekad i kombinacijom MnO 2 / vodljivi polimer / razni ugljikovi materijali. 26,[28][29][30][31] Cilj ovog rada je kemijska priprava MnO 2 i kompozita MnO 2 /polipirol te usporedba pseudokapacitivnih svojstava dobivenih materijala. Vodljivi polimer polipirol (PPy) je upotrijebljen radi povećanja električne vodljivosti MnO 2 , a s obzirom na to da i sam PPy pokazuje pseudokapacitivna svojstva opisana reakcijom (2), može se očekivati da će njegova prisutnost dodatno doprinijeti povećanju kapaciteta kompozitnog materijala.…”

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Karakterizacija pseudokapacitivnih svojstava kemijski priređenog MnO2 te kompozita MnO2/polipirol

2016

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“…Polymers 2015, 7,[1939][1940][1941][1942][1943][1944][1945][1946][1947][1948][1949][1950][1951][1952][1953] Polymers 2015, 7 11…”

Section: Electrochemical Properties Analysisunclassified

“…Electrode materials are the key factor of super-capacitor's capacitance performance. Metal oxides [4], conducting polymers [5], and carbon porous nanoparticles [6] have been identified as the most promising materials for super-capacitors, whose modification and compounds are being used to enhance the material performance [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

High Specific Capacitance of Polyaniline/Mesoporous Manganese Dioxide Composite Using KI-H2SO4 Electrolyte

Jiang

et al. 2015

Polymers

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Abstract:The PANI/Mesoporous MnO 2 composites were prepared through a simple one step method and we introduced the KI-H 2 SO 4 solution as the electrolyte of PANI/MnO 2 composites creatively. The characterization of structure, morphology, and composition are obtained by X-ray diffraction, Fourier transform infrared spectroscopy, thermal gravity analysis, Raman spectra, and scanning electron microscope. The electrochemical performances were investigated by constant-current charge-discharge, the voltammetry curve, and alternating current (AC) impedance technique. The specific capacitance of composites is 1405 F/g, which is almost 10 times larger than MnO 2 (158 F/g). We also find that the iodide concentration is closely related to the specific capacitance. Therefore, we explored the specific capacitance at different iodide concentration (0.05, 0.1, 0.2, 0.5, and 1 M), the results indicated that the specific capacitance reached a maximum value (1580 F/g) at 0.5 mol/L. Additionally, the PANI/Mesoporous MnO 2 composites not only exhibited a good ratio discharge property (857 F/g) at high current density, but also revealed an excellent cycling stability after 500 cycles, which retained 90% of the original specific capacitance.

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Carbon fabric-aligned carbon nanotube/MnO2/conducting polymers ternary composite electrodes with high utilization and mass loading of MnO2 for super-capacitors

Cited by 144 publications

References 48 publications

Enhancement of Oxygen Transfer by Design Nickel Foam Electrode for Zinc−Air Battery

Enhancement of Oxygen Transfer by Design Nickel Foam Electrode for Zinc−Air Battery

Karakterizacija pseudokapacitivnih svojstava kemijski priređenog MnO2 te kompozita MnO2/polipirol

High Specific Capacitance of Polyaniline/Mesoporous Manganese Dioxide Composite Using KI-H2SO4 Electrolyte

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