Yarn-form electrodes with high capacitance and cycling stability based on hierarchical nanostructured nickel-cobalt mixed oxides for weavable fiber-shaped supercapacitors

Micro-mesoporous mixed oxides containing nickel, cobalt and aluminum have been synthesized using conventional coprecipitation method. FESEM and HRTEM analyses demonstrated the flower and hexagonal plate-like nanostructured of mixed oxides. Different mixed oxide formation, homogenous metal dispersion, textural properties were investigated using XRD, ICP-MS and BET (N2 adsorption-desorption) techniques. nanostructured mixed oxides exhibited 2.6 wt% hydrogen adsorption that were studied using temperature programmed reduction-adsorption-desorption (H2-TPR/TPD) and thermogravimetric and differential thermal analysis (TGA-DTA) techniques. Investigation corresponds that morphologies, textural properties and surface energy of mixed oxides are important in hydrogen adsorption.

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Simultaneous Catalytic Oxidation of a Lean Mixture of CO-CH4 over Spinel Type Cobalt Based Oxides

BULLETIN OF CHEMICAL REACTION ENGINEERING AND CATALYSIS ◽

10.9767/bcrec.15.2.6499.490-500 ◽

2020 ◽

Vol 15 (2) ◽

pp. 490-500

Author(s):

Neha Neha ◽

Ram Prasad ◽

Satya Vir Singh

Keyword(s):

Mixed Oxides ◽

Structural Disorder ◽

Catalytic Performance ◽

Molar Ratio ◽

Total Oxidation ◽

Spinel Type ◽

Molar Ratios ◽

Long Term Stability ◽

Nickel Cobalt ◽

Temperature Programmed

A series of nickel-cobalt bimetal oxides in varying molar ratios and its single metal oxides were synthesized by reactive calcination of coprecipitated basic-carbonates. Several characterization techniques, such as: Bruneuer Emmett Teller (BET), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infra Red (FTIR), and Hydrogen Temperature Programmed Reduction (H2-TPR), were performed over the oxides. Activities of oxides were evaluated in methane total oxidation in the presence or the absence of CO. The best catalytic performance was observed over NiCo catalyst with a Ni/Co molar ratio of 1:1, and the complete conversion of CO-CH4 mixture was achieved at 390 °C. Moreover, the presence of carbon monoxide improves CH4 total oxidation over nickel-cobalt mixed oxides. Structural analysis reveals that the insertion of nickel into the spinel lattice of cobalt oxide causes the structural disorder, which probably caused the increase of the amount of octahedrally coordinated divalent nickel cations that are responsible for catalytic activity. Stability of the best-performed catalyst has been tested in the two conditions, showing remarkable long-term stability and thermal stability, however, showed deactivation after thermally ageing at 700 °C. Copyright © 2020 BCREC Group. All rights reserved

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Layer-by-layer electrodeposition of high-capacitance nickel–cobalt oxides on FTO substrate

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-019-01369-y ◽

2019 ◽

Vol 30 (11) ◽

pp. 10311-10320 ◽

Cited By ~ 1

Author(s):

Ieva Barauskienė ◽

Eugenijus Valatka

Keyword(s):

Cobalt Oxides ◽

Layer By Layer ◽

High Capacitance ◽

Nickel Cobalt ◽

Nickel Cobalt Oxides

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In-situ growth of vertically aligned nickel cobalt sulfide nanowires on carbon nanotube fibers for high capacitance all-solid-state asymmetric fiber-supercapacitors

Journal of Energy Chemistry ◽

10.1016/j.jechem.2019.05.008 ◽

2020 ◽

Vol 41 ◽

pp. 209-215 ◽

Cited By ~ 24

Author(s):

Na Liu ◽

Zhenghui Pan ◽

Xiaoyu Ding ◽

Jie Yang ◽

Guoguang Xu ◽

...

Keyword(s):

Carbon Nanotube ◽

Solid State ◽

Cobalt Sulfide ◽

In Situ Growth ◽

High Capacitance ◽

Nickel Cobalt ◽

Vertically Aligned ◽

Carbon Nanotube Fibers

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Hexagonal prism arrays constructed using ultrathin porous nanoflakes of carbon doped mixed-valence Co–Mn–Fe phosphides for ultrahigh areal capacitance and remarkable cycling stability

Journal of Materials Chemistry A ◽

10.1039/c8ta11763b ◽

2019 ◽

Vol 7 (9) ◽

pp. 4431-4437 ◽

Cited By ~ 7

Author(s):

Richao Niu ◽

Gengjie Wang ◽

Yuying Ding ◽

Shaochun Tang ◽

Xuemin Hu ◽

...

Keyword(s):

Mixed Valence ◽

Rate Capability ◽

Cycling Stability ◽

Hexagonal Prism ◽

High Capacitance ◽

Carbon Doped ◽

Areal Capacitance

With novel hierarchical hexagonal prism arrays, a carbon-doped mixed-valence Co–Mn–Fe phosphide electrode shows high capacitance, rate capability and cycling stability.

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