Synthesis of hierarchical structured rare earth metal–doped Co3O4 by polymer combustion method for high performance electrochemical supercapacitor electrode materials

Theerthagiri, Jayaraman; Govindarajan, Durai; Tatarchuk, Tetiana; Sumathi, M.; Kuppusami, P.; Qin, Jiaqian; Choi, Myong Yong

doi:10.1007/s11581-019-03330-9

Cited by 62 publications

(32 citation statements)

References 40 publications

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“…A non-linear discharging behavior is observed with various current densities. The curvature in charge and discharge profile indicates the capacitive behavior of material, which is influenced by both redox reactions (pseudocapacitor) and electrical double layer (EDLC) response, is similar to reported trends [44][45][46][47] . The specific capacitance values were calculated using the expression below (4) curves point towards improved capacitive properties of CFO-N over CFO.…”

Section: Resultssupporting

confidence: 82%

Nitrogen Incorporated Photoactive Brownmillerite Ca2Fe2O5 for Energy and Environmental Applications

Vavilapalli

Banik

Peri

et al. 2020

Sci Rep

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ca 2 fe 2 o 5 (cfo) is a potentially viable material for alternate energy applications. incorporation of nitrogen in ca 2 fe 2 o 5 (CFO-N) lattice modifies the optical and electronic properties to its advantage. Here, the electronic band structures of cfo and cfo-n were probed using Ultraviolet photoelectron spectroscopy (UPS) and UV-Visible spectroscopy. The optical bandgap of CFO reduces from 2.21 eV to 2.07 eV on post N incorporation along with a clear shift in the valence band of CFO indicating the occupation of N 2p levels over O 2p in the valence band. Similar effect is also observed in the bandgap of CFO, which is tailored upto 1.43 eV by N + ion implantation. the theoretical bandgaps of cfo and cfo-n were also determined by using the Density functional theory (Dft) calculations. the photoactivity of these CFO and CFO-N was explored by organic effluent degradation under sunlight. The feasibility of utilizing cfo and cfo-n samples for energy storage applications were also investigated through specific capacitance measurements. The specific capacitance of CFO is found to increase to 224.67 Fg −1 upon n incorporation. cfo-n is thus found to exhibit superior optical, catalytic as well as supercapacitor properties over cfo expanding the scope of brownmillerites in energy and environmental applications.Multifunctional brownmillerite Ca 2 Fe 2 O 5 is a promising material for energy and environmental applications such as fuel cells, supercapacitors, batteries, H 2 production and CO 2 capture, attributed mostly to its multifaceted property like those in catalysis and mixed ionic electronic conduction (MIEC) 1-5 . Presence of a visible region bandgap along with its catalytic activity also enables it as a photoactive material and most importantly as material for textile waste water remediation. There is a huge need for industrial waste water purification of the effluents from the textile industries before releasing it to water bodies. A lower cost and energy requirement pushes us to explore more efficient materials which can absorb a larger percentage of incident natural sunlight and make their impact felt on the environment 6-10 . Well known wide band gap semiconductors, such as TiO 2 and ZnO (bandgap > 3 eV), cannot perfectly match the broad ranges of solar radiation emphasizing the need to investigate new materials/composites with narrow bandgap 11 . Quite recently perovskite metal oxides, such as PbTiO 3 (2.75 eV), AgNbO 3 (2.86 eV), SrNbO 3 (1.9 eV), BiFeO 3 (2.1 eV), LaFeO 3 (2.4 eV), LaNiO 3 (2.42 eV) have been found to possess reasonable catalytic efficiency [12][13][14][15][16][17][18][19] . This encourages us to work with novel materials like oxygen deficient perovskites for sunlight-driven photocatalysis.To meet the above objectives, it is desirable to modify such structures with transition metal-N x active sites to enhance the charge transport features and hence the catalytic activity towards remediation of industrial wastewater 20,21 . Recently, Nitrogen-doped layered perovskite K 2 La 2 Ti 3 O 10 was sh...

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Section: Resultssupporting

confidence: 82%

Nitrogen Incorporated Photoactive Brownmillerite Ca2Fe2O5 for Energy and Environmental Applications

Vavilapalli

Banik

Peri

et al. 2020

Sci Rep

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“…It is known that compare to other metals, nickel is the most effective catalyst where it shows high catalytic activity at a lower temperature. In terms of carbon capacity, nickel is more active than iron at similar reaction conditions [34][35][36][37][38][39]. Our results show from Figure 6, high yield of 54 % Carbon nanotubes are obtained with the mixture of Fe/Ni and Co/Ni as catalysts compared to Fe/Co which gives a yield of 42.3 %.…”

Section: Resultsmentioning

confidence: 75%

Manufacturing and Processing of Carbon Nanotubes for H2 Storage

Namitha

Radhika

Kannan

et al. 2021

Phys. Chem. Solid St.

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In pursuit of manufacturing of carbon nanotubes (CNTs) in good yield at lower temperatures, a mixture of d-block elements such as Iron, Nickel, and Cobalt was expected to be advantageous because of the high yield and low temperature (at 220 - 250° C) synthesis. The physical state and aggregation of these catalyst particles in the reaction medium have been found to play an interesting role in obtaining CNTs at better yield. Carbon nanotubes have been successfully produced by an uncomplicated two-step solvothermal method between sodium and dichlorobenzene via Ni/Fe/Co as catalyst precursor. The dependence of yield of CNTs on the catalyst system was determined via different ratios of catalysts and at various other experimental conditions such as different heating temperatures, different durations of heating. The X-ray powder diffraction study has indicated the graphite kind of the products. Microscopic characterizations (SEM and TEM) implied us the diameters of carbon nanotubes are 10-14 nm. Raman spectroscopy shows the presence of graphitized carbon in carbon nanotubes. Significant influence by the heating temperature and heating duration has been observed on the product yield.

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“…7 (a & b) showed that the cathodic peak current of hydrogen adsorption and the anodic peak current of hydrogen oxidation were proportional to the sweep rate. This proved that the hydrogen adsorption and hydrogen oxidation controlled the whole reaction [26][27][28].…”

Section: Hydrogen Storage Of Carbon Nanotubes By Electrochemical Measmentioning

confidence: 65%

Solvothermal/Hydrothermal Manufacturing of Carbon Nanotubes for Hydrogen storage: A Comparative Study

Namitha

Kannan

Radhika

et al. 2020

Phys. Chem. Solid St.

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Investigation on the manufacturing of multi-walled carbon nanotubes (MWNTs) by solvothermal and hydrothermal procedure and the electrochemical behavior of these nanostructured electrode materials for hydrogen storage has been presented. The physical and morphological properties of prepared carbon nanotubes were studied by X-ray diffraction (XRD), Scanning, and Transmission electron microscopy (SEM and TEM). Furthermore, the electrochemical properties of MWCNTs were revealed by galvanostatic charge-discharge and measurement of cyclic voltammetry and the results revealed that both MWNTs exhibited higher electrochemical capacitance and stable cycling performance. Interestingly, MWNTs synthesized from hydrothermal procedure shows an extreme discharge capacity of 423 mAh/g, concerning hydrogen storage of ∼ 1.5 wt%, and MWNTs synthesized from solvothermal procedure shows a capacity of discharge 394.8 mAh/g. corresponds to ∼ 1.4 wt%, was attained reproducibly at 25 °C for about 100 mg of MWCNTs. This outcome infers that the MWNTs are extremely assuring electrochemical hydrogen storage materials for PEM fuel cells and rechargeable batteries.

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Synthesis of hierarchical structured rare earth metal–doped Co3O4 by polymer combustion method for high performance electrochemical supercapacitor electrode materials

Cited by 62 publications

References 40 publications

Nitrogen Incorporated Photoactive Brownmillerite Ca2Fe2O5 for Energy and Environmental Applications

Nitrogen Incorporated Photoactive Brownmillerite Ca2Fe2O5 for Energy and Environmental Applications

Manufacturing and Processing of Carbon Nanotubes for H2 Storage

Solvothermal/Hydrothermal Manufacturing of Carbon Nanotubes for Hydrogen storage: A Comparative Study

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