Synthesis of a novel polyaniline-intercalated layered manganese oxide nanocomposite as electrode material for electrochemical capacitor

Zhang, Xiong; Ji, Liyan; Zhang, Shichao; Yang, Wensheng

doi:10.1016/j.jpowsour.2007.08.083

Cited by 226 publications

(98 citation statements)

References 30 publications

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“…Similar morphology has been observed for plate-like layered manganese oxide catalysts [22][23][24]; however, the larger surface area in these studies was probably caused by the presence of pillared material (e.g., alumina, lithium). The presence of pillared material creates a larger interlayer distance and results in pores having the form of parallel plates.…”

Section: Scanning Electron Microscopysupporting

confidence: 81%

Liquid-phase aerobic oxidation of benzyl alcohol catalyzed by mechanochemically synthesized manganese oxide

2013

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Benzyl alcohol oxidation by molecular oxygen using solid manganese oxide as a catalyst and n-heptane as the solvent was studied in the liquid phase. The catalyst was synthesized by a simple mechanochemical process at room temperature and was characterized by different physical methods. The catalyst was highly active and 100% selective for benzyl alcohol conversion to benzaldehyde. The solid catalyst can be recovered from the reaction mixture by simple filtration and can be re-used. We found n-heptane to be an excellent solvent for the oxidation reaction, and that the catalyst did not leach into solution.benzaldehyde, catalyst selectivity, chemical analysis, n-heptane, environment Citation:Ilyas M, Siddique M, Saeed M. Liquid-phase aerobic oxidation of benzyl alcohol catalyzed by mechanochemically synthesized manganese oxide. Chin

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Section: Scanning Electron Microscopysupporting

confidence: 81%

Liquid-phase aerobic oxidation of benzyl alcohol catalyzed by mechanochemically synthesized manganese oxide

2013

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“…21 A 0.25 g sample of OCTA-MnO 2 was put into 40 mL of NMP and sonicated for 3 h, while 0.05 g polypyrrole was added to 20 mL NMP and sonicated for 1 h. The polypyrrole-NMP colloid was added to the OCTA-MnO 2 suspension and then allowed to stir for 24 h at 40°C. The reaction mixture was filtered and washed with acetone and NMP, and then the products were dried at 50°C for 12 h. The product was designated as PPy-MnO 2 .…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Polypyrrole-Intercalated Layered Manganese Oxide Nanocomposite by a Delamination∕Reassembling Method and Its Electrochemical Capacitance Performance

Zhang

Yang

2009

Electrochem. Solid-State Lett.

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A polypyrrole-intercalated layered manganese oxide nanocomposite ͑PPy-MnO 2 ͒ has been synthesized by a delamination/ reassembling process. X-ray diffraction analysis shows that the basal spacing of the PPy-MnO 2 nanocomposite is 1.38 nm. The room-temperature conductivity of the PPy-MnO 2 nanocomposite is found to be 1.3 ϫ 10 −1 S/cm, which is 4-5 orders of magnitude higher than that of the pristine manganese oxide ͑6.1 ϫ 10 −6 S/cm͒. The improved specific capacitance of the PPy-MnO 2 nanocomposite ͑290 F/g͒ compared with that of the pristine manganese oxide ͑221 F/g͒ is attributed to a combination of the conductivity effect and the high specific capacitance of PPy. © 2009 The Electrochemical Society. ͓DOI: 10.1149/1.3082015͔ All rights reserved.Manuscript submitted September 29, 2008; revised manuscript received January 15, 2009. Published February 17, 2009 Electrochemical capacitors ͑or supercapacitors͒ are chargestorage devices which possess high power density, excellent reversibility, and long cycle life compared with batteries.1-4 Depending on their charge-storage mechanism, electrochemical capacitors are divided into electric double-layer capacitors ͑EDLCs͒ and pseudocapacitors. The energy-storage mechanism of EDLCs relies on the separation of charges at the interface between an electrode and an electrolyte. Various carbonaceous materials ranging from amorphous carbons to carbon nanotubes have been used as electrode materials in EDLCs.2 In the case of pseudocapacitors, a faradaic process occurs in addition to a simple charge separation. Numerous metal oxides and conducting polymers have demonstrated qualifications as electrode materials for pseudocapacitors. Among these materials, hydrated ruthenium oxide exhibits remarkably high specific capacitance, as high as 1300 F/g, and excellent reversibility. 5,6 However, the high cost and the toxicity to the environment have limited its wide application. Therefore, much research interest has focused on other transition metal oxides. In this respect, manganese oxide is one of the most attractive candidates for electrochemical capacitor electrode materials because of its environmental friendliness and low cost.7-9 However, manganese oxide exhibits inferior specific capacitance and electrical conductivity to ruthenium oxide. Polypyrrole ͑PPy͒, as a kind of conducting polymer, has advantageous properties with respect to low cost, high conductivity, and high doping/ dedoping rate during charge/discharge. [10][11][12][13][14][15] However, it exhibits the disadvantage of a low cycle life because swelling and shrinkage may occur during doping/dedoping processes, thus leading to mechanical degradation of the electrodes and fading of electrochemical performance. 16,17 A combination of manganese oxide and conducting polymer appears interesting for supercapacitor electrodes. The resulting composite is expected to possess synergic properties from both components, such as enhancement in electrical conductivity or electrochemical cycling stability. Recently, Sivakkumar et al. pr...

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“…In addition, Kapteijn et al [31] The Mn 2p XPS spectra of the fresh and sulphated Mn-Ce/Al2O3 samples are shown in Figure 7a. Two peaks, due to Mn 2p1/2 and Mn 2p3/2, were observed from 637.0 eV to 662.5 eV, which are characteristic of a mixed-manganese system (Mn 2+ , Mn 3+ , and Mn 4+ ) [28]. The Mn 2p XPS spectra of the F-Mn-Ce/Al2O3 could be classified into six subpeaks: Mn 2+ (641.6 and 652.1 eV), Mn 3+ (643.1 and 653.9 eV), and Mn 4+ (644.2 and 655.1 eV) [29], indicating that Mn 2+ , Mn 3+ , and Mn 4+ co-exist on the surface of the catalysts.…”

Section: Xpsmentioning

confidence: 99%

“…The XRD patterns of the honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts before and after the reaction are depicted in Figure 6. Several diffraction peaks observed at 28 (PDF#34-0394). The peaks attributed to CeO 2 could also be seen before and after the SCR reaction [25].…”

Section: Xpsmentioning

confidence: 99%

Poisoning Effect of SO2 on Honeycomb Cordierite-Based Mn–Ce/Al2O3Catalysts for NO Reduction with NH3 at Low Temperature

et al. 2018

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Honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts were prepared by the impregnation method and used for low-temperature selective catalytic reduction (SCR) of NO x with NH 3 , with and without SO 2 and/or H 2 O in a homemade fixed-bed tubular reactor. The catalyst reached nearly 80% NO x conversion at 100 • C in the absence of SO 2 . However, SO 2 reduces the catalytic activity (80% to 72%) of the honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts under identical conditions. This finding demonstrated that the catalyst exhibited high activity at low temperature and excellent SO 2 resistance in the presence of 50 ppm SO 2 . The fresh and sulfated honeycomb cordierite-based Mn-Ce/Al 2 O 3 catalysts were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), N 2 adsorption-desorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetry and differential thermal analysis (TG-DTA), and Fourier transform infrared (FT-IR) spectroscopy. Characterization results indicated that the deactivation by SO 2 was primarily the result of the deposition of ammonium hydrogen sulfate and sulfated CeO 2 on the catalyst surface during the SCR process. The formed sulfates depressed the catalytic activity via the blocking of pores and the occupation of active sites. Additionally, the competitive adsorption between SO 2 and NH 3 always decreased the catalytic activity.

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Synthesis of a novel polyaniline-intercalated layered manganese oxide nanocomposite as electrode material for electrochemical capacitor

Cited by 226 publications

References 30 publications

Liquid-phase aerobic oxidation of benzyl alcohol catalyzed by mechanochemically synthesized manganese oxide

Liquid-phase aerobic oxidation of benzyl alcohol catalyzed by mechanochemically synthesized manganese oxide

Synthesis of Polypyrrole-Intercalated Layered Manganese Oxide Nanocomposite by a Delamination∕Reassembling Method and Its Electrochemical Capacitance Performance

Poisoning Effect of SO2 on Honeycomb Cordierite-Based Mn–Ce/Al2O3Catalysts for NO Reduction with NH3 at Low Temperature

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