Synthesis of 3D architecture CuO micro balls and nano hexagons and its electrochemical capacitive behavior

Subalakshmi, P.; Ganesan, M.; Sivashanmugam, A.

doi:10.1016/j.matdes.2017.01.068

Cited by 23 publications

(15 citation statements)

References 49 publications

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“…The O 1s core spectra of CeO 2 and 6% CuO-CeO 2 (Figure 5c) exhibit two peaks, a broad intense peak at 529 eV and a less-intense peak at 530.7 eV in the case of CeO 2 and a broad intense peak at 529.2 eV and a less-intense peak at 531.3 in the case of CuO-CeO 2 . The main intense XPS peaks at a lower binding energy (529–529.2 eV) are ascribed to the lattice O 2− ions, whereas the less-intense shoulder peaks at a higher binding energy (530.7–531.3 eV) can be attributed to the hydroxyl (–OH) or polarized oxygen species present close to the oxygen vacancies [57,58]. The center of the main and shoulder peaks in the case of CuO-CeO 2 are slightly shifted to higher binding energy (blue-shift) when compared to pure CeO 2 , indicating the influence of the difference in electronegativity between copper and cerium on the chemical speciation of oxygen species.…”

Section: Resultsmentioning

confidence: 99%

Combustion Synthesis of Non-Precious CuO-CeO2 Nanocrystalline Catalysts with Enhanced Catalytic Activity for Methane Oxidation

Zedan

Aljaber

2019

Materials

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In this study, xCuO-CeO2 mixed oxide catalysts (Cu weight ratio x = 1.5, 3, 4.5, 6 and 15 wt.%) were prepared using solution combustion synthesis (SCS) and their catalytic activities towards the methane (CH4) oxidation reaction were studied. The combustion synthesis of the pure CeO2 and the CuO-CeO2 solid solution catalysts was performed using copper and/or cerium nitrate salt as an oxidizer and citric acid as a fuel. A variety of standard techniques, including scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), thermo-gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were employed to reveal the microstructural, crystal, thermal and electronic properties that may affect the performance of CH4 oxidation. The CuO subphase was detected in the prepared solid solution and confirmed with XRD and Raman spectroscopy, as indicated by the XRD peaks at diffraction angles of 35.3° and 38.5° and the Ag Raman mode at 289 cm−1, which are characteristics of tenorite CuO. A profound influence of Cu content was evident, not only affecting the structural and electronic properties of the catalysts, but also the performance of catalysts in the CH4 oxidation. The presence of Cu in the CeO2 lattice obviously promoted its catalytic activity for CH4 catalytic oxidation. Among the prepared catalysts, the 6% CuO-CeO2 catalyst demonstrated the highest performance, with T50 = 502 °C and T80 = 556 °C, an activity that is associated with the availability of a fine porous structure and the enhanced surface area of this catalyst. The results demonstrate that nanocrystalline copper-ceria mixed oxide catalysts could serve as an inexpensive and active material for CH4 combustion.

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Section: Resultsmentioning

confidence: 99%

Combustion Synthesis of Non-Precious CuO-CeO2 Nanocrystalline Catalysts with Enhanced Catalytic Activity for Methane Oxidation

Zedan

Aljaber

2019

Materials

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“…The variation in lattice constant value was caused due to variation in crystallite size contributed by several factors like surface energy, lack of outermost bonding on the surface atoms and intra‐crystalline pressure. In the present investigation the observed variation in ‘a’ values was due to the self‐interstitials and mechanically induced strains developed during nucleation . Co 3 O 4 formation mechanism is given as below:

true Co^{2 +} + 6 H_{2} normalO \to [Co (normalH_{2} normalO)_{6}]^{2 +}

true NH_{3} + normalH_{2} normalO \to NH^{4 +} + OH^{^{-}}

true [Co (normalH_{2} normalO)_{6}]^{2 +} + 2 OH^{^{-}} \to Co (OH)_{2} + 6 H_{2} normalO

true 6 Co (OH)_{2} + normalO_{2} \to 2 Co_{3} normalO_{4} + 6 H_{2} normalO

…”

Section: Resultsmentioning

confidence: 99%

“…Carbon coating was found to be one of the effective ways to improve the performance of TMOs by increasing the conductivity of active material and also accommodating large volume expansion . Nano structured active materials with high surface to volume ratio enhanced the conductivity of TMOs . Reducing the particle size was also an efficient methodology to improve the electrochemical performance by shortening the diffusion path length and to create larger contact area between the electrode‐electrolyte interface ,.…”

Section: Introductionmentioning

confidence: 99%

Nano Co₃O₄ as Anode Material for Li–Ion and Na‐Ion Batteries: An Insight into Surface Morphology

Subalakshmi

Sivashanmugam

2018

ChemistrySelect

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Co 3 O 4 is regarded as a competent anode material for lithium and sodium ion batteries having high theoretical capacity of 890 mAh g -1 obtained through metal displacement reaction with Li or Na. Nano Co 3 O 4 consisting of 20-30 nm-sized particles was synthesized through a simple precipitation method and characterized through X-ray diffraction, Fouriertransform infrared spectroscopy, scanning electron microscopy, Transmission electron microscopy and X-ray photoelectron spectroscopy. Electrochemical evaluation of the nano Co 3 O 4 as anode material for Li-ion and Na-ion batteries was performed through cyclic voltammetry, electrochemical impedance spectroscopy and charge-discharge cycling studies. Nano Co 3 O 4 delivered high discharge capacity of 423 mAh g -1 at 0.1 C even after 40 cycles as Li-ion battery anode and exhibited stable discharge behaviour up to 130 cycles with high rate capability. Nano Co 3 O 4 in Na-ion configuration delivered discharge capacity of 101 mAh g -1 at 0.1 C rate even after 30 cycles. At higher current rates Co 3 O 4 electrodes exhibited severe capacity fading due to the huge volume change occurred during sodiation / desodiation. Ex-situ SEM and elemental analyses evidenced that disintegration of electrode structure resulting from volume change and continuous decomposition of electrolyte were responsible for the poor electrochemical performance of Co 3 O 4 with Na + ions while in Li-ion configuration nano Co 3 O 4 outshined in cycling performance.[a] Prof.

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“…The energy storage of pseudocapacitors is based on both ion adsorption and fast surface redox reactions, which can beneficially endow high specific capacitance and energy density compared to electrochemical double-layer capacitors [ 1 , 2 ]. The transition metal oxides, such as MnO x , RuO 2, CoO x , Cr 2 O 3 , CuO, NiO, CeO 2 , and FeO x , are widely employed, thanks to their low cost, low toxicity, and environmental friendliness, as active electrode materials for pseudocapacitors [ 3 , 4 , 5 , 6 ]. For example, manganese oxide (MnO 2 ) has stood out because of its amazingly high theoretical specific capacitance of 1370 F·g −1 [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Effective Self-Propagating Synthesis of Lamellar ZnO-Decorated MnO2 Nanocrystals with Improved Supercapacitive Performance

et al. 2021

Nanomaterials

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A series of MOx (M = Co, Ni, Zn, Ce)-modified lamellar MnO2 electrode materials were controllably synthesized with a superfast self-propagating technology and their electrochemical practicability was evaluated using a three-electrode system. The results demonstrated that the specific capacitance varied with the heteroatom type as well as the doping level. The low ZnO doping level was more beneficial for improving electrical conductivity and structural stability, and Mn10Zn hybrid nanocrystals exhibited a high specific capacitance of 175.3 F·g−1 and capacitance retention of 96.9% after 2000 cycles at constant current of 0.2 A·g−1. Moreover, XRD, SEM, and XPS characterizations confirmed that a small part of the heteroatoms entered the framework to cause lattice distortion of MnO2, while the rest dispersed uniformly on the surface of the carrier to form an interfacial collaborative effect. All of them induced enhanced electrical conductivity and electrochemical properties. Thus, the current work provides an ultrafast route for development of high-performance pseudocapacitive energy storage nanomaterials.

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Synthesis of 3D architecture CuO micro balls and nano hexagons and its electrochemical capacitive behavior

Cited by 23 publications

References 49 publications

Combustion Synthesis of Non-Precious CuO-CeO2 Nanocrystalline Catalysts with Enhanced Catalytic Activity for Methane Oxidation

Combustion Synthesis of Non-Precious CuO-CeO2 Nanocrystalline Catalysts with Enhanced Catalytic Activity for Methane Oxidation

Nano Co₃O₄ as Anode Material for Li–Ion and Na‐Ion Batteries: An Insight into Surface Morphology

Highly Effective Self-Propagating Synthesis of Lamellar ZnO-Decorated MnO2 Nanocrystals with Improved Supercapacitive Performance

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Synthesis of 3D architecture CuO micro balls and nano hexagons and its electrochemical capacitive behavior

Cited by 23 publications

References 49 publications

Combustion Synthesis of Non-Precious CuO-CeO2 Nanocrystalline Catalysts with Enhanced Catalytic Activity for Methane Oxidation

Combustion Synthesis of Non-Precious CuO-CeO2 Nanocrystalline Catalysts with Enhanced Catalytic Activity for Methane Oxidation

Nano Co3O4 as Anode Material for Li–Ion and Na‐Ion Batteries: An Insight into Surface Morphology

Highly Effective Self-Propagating Synthesis of Lamellar ZnO-Decorated MnO2 Nanocrystals with Improved Supercapacitive Performance

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Nano Co₃O₄ as Anode Material for Li–Ion and Na‐Ion Batteries: An Insight into Surface Morphology