Hydrothermal Synthesis and Optical, Magnetic, and Supercapacitance Properties of Nanoporous Cobalt Oxide Nanorods

Wang, Guoxiu; Shen, Xiaoping; Horvat, J.; Wang, Bei; Liu, Hao; Wexler, David; Yao, Jane

doi:10.1021/jp8106149

Cited by 390 publications

(267 citation statements)

References 26 publications

Supporting

Mentioning

252

Contrasting

Order By: Relevance

“…Co3O4 nanocrystals have also been synthesized via a facile combustion method by Feng et al [29]. Beside these several other methods have also been used for the synthesis of spinel Co3O4 nanocrystals such as sol-gel method, polyol process, solvothermal synthesis, polymer assisted synthesis, thermal decompositions, reflux/microwave assisted methods and hydrothermal synthesis for Co3O4 nanorods [30,23,[31][32][33][34][35][36]. All these methods produce high quality nanostructure with different morphologies, but the requirement of high temperature limits the compatibility of growth e.g.…”

Section: Introductionmentioning

confidence: 99%

Effect of anions on the morphology of Co3O4 nanostructures grown by hydrothermal method and their pH sensing application

Hussain

Ibupoto

Abbasi

et al. 2014

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

Abstract:A fast, reliable, accurate, precise and sensitive pH sensor device is highly demanding for the monitoring of pH in biological, clinical and food industry samples. In this research work, the effect of anions on the morphology of cobalt oxide (Co3O4) nanostructures is investigated using low temperature chemical approach for the growth. Different anions have shown visible effect on the morphology of Co3O4 nanostructures. Scanning electron microscopy, X-ray diffraction and transmission electron microscopy techniques were used for the material characterization.This study has shown highly dense, uniform and good crystal quality of fabricated Co3O4 nanostructures. The nanostructures obtained from the cobalt chloride were used for the development of potentiometric pH sensor electrode. The pH sensor electrode showed excellent linearity and close to Nernstian response for the pH range of 3-13 with a sensitivity of -58.45 mV/pH. Moreover, the proposed sensor showed a fast response time of 53 s, and acceptable reducibility and repeatability. The highly sensitive and a fast time response of the proposed sensor device indicate its potential application for the monitoring of pH from real samples including biological fluids.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of anions on the morphology of Co3O4 nanostructures grown by hydrothermal method and their pH sensing application

Hussain

Ibupoto

Abbasi

et al. 2014

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

show abstract

“…The shape and size of the deposited aggregates agree with that reported for Co 3 O 4 on other substrates. 48,50,54,55,[57][58][59][60][61][62][63] In contrast, the Mn sample shows that the deposited Mn oxide is heterogeneously distributed on the carbon fibers (Figure 5b). Big aggregates of this oxide with sizes up to 100 μm are observed.…”

Section: Resultsmentioning

confidence: 96%

“…44 This compound is a p-type semiconductor and shows an electrical conductivity of the order of 10 −3 S cm −1 , 45 which is much higher than the electrical conductivity of MnO 2 · xH 2 O. 3 The Co oxide has been prepared by chemical 43,[47][48][49][50][51][52] or electrochemical route 42,[53][54][55][56][57][58][59][60][61][62][63] on several substrates, usually metallic substrates. Regarding the two oxides together, there * Electrochemical Society Member.…”

mentioning

confidence: 99%

Composite Electrodes Made from Carbon Cloth as Supercapacitor Material and Manganese and Cobalt Oxide as Battery One

Aldama

Barranco

Centeno

et al. 2016

J. Electrochem. Soc.

View full text Add to dashboard Cite

Mn oxide and/or Co oxide are deposited on flexible carbon cloth by a cathodic potentiodynamic procedure from their respective sulfates. In KOH electrolyte, the charge stored from reversible redox reactions of the two oxides (battery response) overlaps with the charge stored from the double layer of the carbon cloth (supercapacitor response). These charges or capacities are compared. For the electrodes having one oxide only, either Mn or Co oxide, the highest capacity is obtained for 8 wt% oxide load. To overcome this limitation, both Mn and Co oxide are simultaneously or sequentially electrodeposited on carbon cloth over a broad compositional range. The electrode capacity can reach 71 mA · h · g −1 or 0.9 mA · h · cm −2 , which are higher than the values found for the bare carbon cloth. The electrode capacity depends on the relative content of the carbon cloth and the two deposited oxides according to the rule of mixtures. The decrease of the specific surface area of the carbon cloth is discussed in relation to the deposited oxide. The high capacity retention vs current is due to the contribution of the carbon cloth substrate. The electrode cycle life is discussed on the basis of the supercapacitor response and battery one.

show abstract

“…There are hydrothermal method [2,[7][8][9], the thermal decomposition method [10][11], solid-phase precipitation [12], sol-gel method [3,[13][14] and chemical vapor deposition method [15][16] for preparing Co 3 O 4 in laboratory. Generally using the thermal decomposition of cobalt salts to get Co 3 O 4 is easy to operate in industry.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Electrochemical Characterization of La Doping Co3O4 Super Capacitor Electrode Materials

Chen¹,

Zhan²

2015

Proceedings of the International Conference on Chemical, Material and Food Engineering

View full text Add to dashboard Cite

Abstract-An aqueous solution containing deionized water, cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O), ethylene glycol (EG) and urea (NH 2 CONH 2 ) were reacted in an autoclave with hydrothermal reaction method at 180 o C for 20 h to generate precursors with 0.1%, 0.2%, 0.3%, 0.4% and 0.5% of La (NO3)3. Then the precursor was decomposed to cobalt oxide powders at 300-500 oC for 2h. The morphology and electrochemical properties of samples were characterized by powder X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical analyzer. The results suggested that the average crystallite size and fine crystallinity of Co3O4 crystal lattices increased with the mass percentage of La (NO3)3. Ethylene glycol as a shaping agent may be the possible reasons of decrease in particle size at higher temperatures in the process of the formation of Co3O4 microspheres. The specific capacitance and the current density of the best sample are 5 ma/s, 372.7 F/g and 10 ma/s, 310.56 F/g respectively.

show abstract

Hydrothermal Synthesis and Optical, Magnetic, and Supercapacitance Properties of Nanoporous Cobalt Oxide Nanorods

Cited by 390 publications

References 26 publications

Effect of anions on the morphology of Co3O4 nanostructures grown by hydrothermal method and their pH sensing application

Effect of anions on the morphology of Co3O4 nanostructures grown by hydrothermal method and their pH sensing application

Composite Electrodes Made from Carbon Cloth as Supercapacitor Material and Manganese and Cobalt Oxide as Battery One

Preparation and Electrochemical Characterization of La Doping Co3O4 Super Capacitor Electrode Materials

Contact Info

Product

Resources

About