Comparative supercapacitance performance of CuO nanostructures for energy storage device applications

Senthilkumar, V.; Kim, Yong Soo; Chandrasekaran, S.; Rajagopalan, Balasubramaniyan; Kim, Eui Jung; Chung, Jin Suk

doi:10.1039/c5ra00035a

Cited by 117 publications

(56 citation statements)

References 41 publications

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“…The XRD patterns of the CuO-TiO 2 NT catalysts with a Cu content larger than 5 wt % (Figure 4a and Figure S1) exhibit diffraction peaks at 35.5 • (−111) and 38.6 • (111), characteristic of CuO phase in correlation with the reference pattern of tenorite CuO (Card JCPDS No. 00-001-1117) and that reported in the literature for monoclinic phase CuO [26][27][28]. The strong diffraction peaks of all samples indicate the purity and high crystalline nature of the TiO 2 and CuO phases in the different xCuO-TiO 2 NT catalysts.…”

Section: The Crystal Structure and Thermal Stabilitysupporting

confidence: 49%

“…The increased heating tolerance of the TiO 2 nanotubes modified with CuO nanoparticles can be attributed to the reduction of the total number of OH groups hydrated in the interlayers of the TiO 2 NTs, since Cu is hydrated with fewer OH groups relative to those hydrated at the Ti surface [31]. [26][27][28]. The strong diffraction peaks of all samples indicate the purity and high crystalline nature of the TiO2 and CuO phases in the different xCuO-TiO2 NT catalysts.…”

Section: The Crystal Structure and Thermal Stabilitymentioning

confidence: 91%

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A Study of Low-Temperature CO Oxidation over Mesoporous CuO-TiO2 Nanotube Catalysts

2017

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Supported copper oxide nanoparticles have attracted considerable attention as active and non-precious catalysts for many catalytic oxidation reactions. Herein, mesoporous xCuO-TiO 2 nanotube catalysts were fabricated, and their activity and kinetics toward CO oxidation were studied. The morphology and structure of the prepared catalysts were systematically studied using SEM, TEM, EDS, EDX, XRD, TGA, BET, XPS, H 2 -TPR, and Raman techniques. The BET surface area study revealed the effect of the large surface area of the mesoporous TiO 2 nanotubes on promoting the catalytic activity of prepared catalysts. The results also revealed the existence of strong metal-support interactions in the CuO-TiO 2 nanotube catalyst, as indicated by the up-shift of the E 2g vibrational mode of TiO 2 from 144 cm −1 to 145 cm −1 and the down-shift of the binding energy (BE) of Ti 2p 3/2 from 458.3 eV to 458.1 eV. The active phase of the catalyst consists of fine CuO nanoparticles dispersed on a mesoporous anatase TiO 2 nanotube support. The 50-CuO-TiO 2 nanotube catalyst demonstrated the highest catalytic activity with 100% CO conversion at T 100 = 155 • C and a reaction rate of 36 µmole s −1 g −1 . Furthermore, the catalyst demonstrated excellent long-term stability with complete CO conversion that was stable for 60 h under a continuous stream. The enhanced catalytic activity is attributed to the interplay at the interface between the active CuO phase and the TiO 2 nanotubes support.

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Section: The Crystal Structure and Thermal Stabilitysupporting

confidence: 49%

Section: The Crystal Structure and Thermal Stabilitymentioning

confidence: 91%

A Study of Low-Temperature CO Oxidation over Mesoporous CuO-TiO2 Nanotube Catalysts

2017

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“…Copper oxides have been extensively studied in energy storage devices including supercapacitors and lithium‐ion batteries, because of their ease of preparation, low environmental impact and high electrochemical activity . In order to improve the electrode's performance, self‐supported materials have been created by directly growing the active material on the surface of the current collector ,.…”

Section: Introductionmentioning

confidence: 99%

Sodium‐Salt‐Promoted Growth of Self‐Supported Copper Oxides with Comparative Supercapacitive Properties

Chen

Huang

et al. 2017

ChemElectroChem

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In this work, we developed a facile hydrothermal system to synthesize self‐supported copper oxides with different nanostructures. In this system, we used copper foam as both the substrate and the copper source, and selected a wide range of sodium salts to serve as directing agents, promoting the formation of copper oxide with different nanostructures. We first show that, at 30 mM of sodium fluoride, we can successfully grow nanocubes on the copper foam substrate that comprise both CuO and Cu2O. Such a mixed composition is unique among the investigated salts. However, if a lower concentration of NaF or a different salt is used, Cu2O nanocrystals of different structures, such as nanoplatelets or irregular particles, can be obtained. When these samples were tested in supercapacitors, they demonstrated contrasting pseudocapacitive properties where the initial mixed Cu2O/CuO nanocube sample demonstrated a very stable reversible capacitance of about 400 mF cm−2 for 1600 cycles. This is significantly higher than that for the other samples, as well as advantageous compared to other copper‐oxide‐based electrode materials. The impedance analysis suggested that such a performance could be attributed to the low diffusion resistance of this sample.

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“…21 Furthermore, these nanostructures can be easily converted to CuO 20,22,23 which is known as a p-type semiconductor with a narrow indirect bandgap of 1.2-1.5 eV at room temperature (RT), 24,25 with variety of applications in sensors, solar cells, Li-ion battery electrodes 26,27 and supercapacitors. [28][29][30][31][32] CuO as a supercapacitor electrode has speci¯c capacitance in the range of 100-620 F/g. 30,32 The recent studies have shown that metal hydroxides materials are prone to deliver better capacitance than metal oxides due to higher stability especially in alkaline solutions.…”

Section: Introductionmentioning

confidence: 99%

Electric Field Enhanced Synthesis of Copper Hydroxide Nanostructures for Supercapacitor Application

Sepahvand

Ghasemi

Sanaee

2017

NANO

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Electric¯eld enhanced approach has been used to synthesize di®erent copper hydroxide morphologies as high-performance supercapacitors electrode materials. Employing this e±cient, simple and low cost method, various shapes such as rod,°ower and cube with an average grain size of 30 nm to 1 m were obtained on the copper substrate. The results revealed that applied electric¯eld considerably accelerates the formation time of nanostructures from several days to close to 1 min, where some of the desired nanostructures were obtained even in 1 s. The electrochemical properties of di®erent morphologies were compared using cyclic voltammograms and charge/discharge tests and electrochemical impedance spectroscopy. The obtained results demonstrated that the two types of fabricated structures showed high maximum areal and speci¯c capacitance of 42 mF/cm 2 and 178 F/g at scan rate of 20 mVs À1 , respectively, which make them excellent and promising electrode materials for supercapacitors.

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Comparative supercapacitance performance of CuO nanostructures for energy storage device applications

Abstract: (a)–(c) FE-SEM images of CuO nanoplates on Ni foam, flower-shaped CuO and bud-shaped CuO. (d) Specific capacitance and (d) and (e) Ragone plots of power density vs. energy density according to CuO electrodes in an asymmetrical device.

Cited by 117 publications

References 41 publications

A Study of Low-Temperature CO Oxidation over Mesoporous CuO-TiO2 Nanotube Catalysts

A Study of Low-Temperature CO Oxidation over Mesoporous CuO-TiO2 Nanotube Catalysts

Sodium‐Salt‐Promoted Growth of Self‐Supported Copper Oxides with Comparative Supercapacitive Properties

Electric Field Enhanced Synthesis of Copper Hydroxide Nanostructures for Supercapacitor Application

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