Simple synthesis of Co3O4 nanoflakes using a low temperature sol–gel method suitable for photodegradation of dyes

Binitha, N. N.; Suraja, P. V.; Yaakob, Zahira; Resmi, M. R.; Silija, P. P.

doi:10.1007/s10971-009-2098-8

Cited by 57 publications

(19 citation statements)

References 10 publications

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“…There is no obvious absorption bands assigned to symmetric vibration of-OH groups and O-H vibration from H 2 O, indicate that a large number of-OH group and H 2 O are removed completed during the calcination process. Therefore, the Co 3 O 4 nanofibers show a strong absorption peaks at 667 cm À1 and 574 cm À1 which attributed to the stretching vibration of Co-O band [34,35]. It confirms the formation of high pure Co 3 O 4 nanofibers.…”

Section: Ftir Spectral Studiesmentioning

confidence: 59%

Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

Kumar

Angaiah

Balakrishnan

2014

Electrochimica Acta

138

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Section: Ftir Spectral Studiesmentioning

confidence: 59%

Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

Kumar

Angaiah

Balakrishnan

2014

Electrochimica Acta

138

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“…[18][19][20][21] Up to date, various types of preparation methods have been developed for the preparation of Co 3 O 4 by thermal decomposition, [6][7][8]20,22,23) chemical spray pyrolysis, 24) spattering, 25) and sol-gel process. [26][27][28] In contrast, liquid-phase synthesis of Co 3 O 4 particles has been of signi cant interests because the liquid phase process has large potentials to obtain highly puri ed and homogenized Co 3 O 4 particles. The resulting Co 3 O 4 particles controlled in their size, crystalline diameter, and morphology have been expected to exhibit unique material features.…”

Section: Introductionmentioning

confidence: 99%

Direct Hydrothermal Synthesis of Size-Controlled Co<sub>3</sub>O<sub>4</sub> Nanocubes under Highly Condensed Conditions

2017

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Cobalt oxide (Co 3 O 4 ) nanocubes with high crystallinity and a narrow size distribution have been synthesized in one pot process under highly condensed hydrothermal reactions using cobalt(II) nitrate (Co(NO 3 ) 2 ) and sodium hydroxide or tetramethylammonium hydroxide. The particle morphology was controlled to a cubic shape by change in the initial pH. The particle mean diameter was also gradually controlled by the change in the initial pH in the range from 18 nm to 66 nm. Co(OH) 2 hexagonal thin platelet particles were obtained as the predominant product when CoSO 4 , CoCl 2 , and Co(CH 3 COO) 2 were used as the Co-source. The result indicated that oxidation ability of nitrate anions played an important role to obtain the Co 3 O 4 nanocubes in the one pot process.

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“…Therefore the active outer sphere of Co-300 was mechanically removed and the resulting powder was used for the FTIR study. Co 3 O 4 is known to show two absorption bands with medium amplitude at specific positions (~550 and 650 cm -1 ) due to stretching vibration of the metal-O bond 54,55,56 . Indeed, these absorption bands can be clearly seen in our spectrum ( Figure S3) indicating that Co is octahedral surrounded by oxygen.…”

mentioning

confidence: 99%

X20CoCrWMo10-9//Co₃O₄: a metal–ceramic composite with unique efficiency values for water-splitting in the neutral regime

Schäfer

Chevrier

Kuepper

et al. 2016

Energy Environ. Sci.

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In spite of the drastic oil price collapse in the second half of 2014 resulting in a price below 30 $/barrel in January 2016 1 , the exploration of promising renewable energy sources for the Abstract: Water splitting allows the storage of solar energy into chemical bonds (H 2 +O 2 ) and will help to implement the urgently needed replacement of limited available fossil fuels. Particularly in neutral environment electrochemically initiated water splitting suffers from low efficiency due to high overpotentials (η) caused by the anode. Electro-activation of X20CoCrWMo10-9, a Co-based tool steel resulted in a new composite material (X20CoCrWMo10-9//Co 3 O 4 ) that catalyzes the anode half-cell reaction of water electrolysis with a so far-, unequalled effectiveness. The current density achieved with this new anode in pH 7 corrected 0.1 M phosphate buffer is over a wide range of η around 10 times higher compared to recently developed, up-to-date electrocatalysts and represents the benchmark performance advanced catalysts show in regimes that support water splitting significantly better than pH 7 medium. X20CoCrWMo10-9//Co 3 O 4 exhibited electrocatalyticproperties not only at pH 7, but also at pH 13, which is much superior to the ones of IrO 2 -RuO 2 , single-phase Co 3 O 4 -or Fe/Ni-based catalysts. Both XPS and FT-IR experiments unmasked Co 3 O 4 as the dominating compound on the surface of the X20CoCrWMo10-9//Co 3 O 4 composite. Upon a comprehensive dual beam FIB-SEM (focused ion beam-scanning electron microscopy) study we could show that the new composite does not exhibit a classical substrate-layer structure due to the intrinsic formation of the Co-enriched outer zone. This structural particularity is basically responsible for the outstanding electrocatalytic OER performance.2 future is one of the significant challenges for scientists and engineers concerned with energy issues research. Splitting of water into hydrogen and oxygen by exploiting solar energy transforms water to an inexhaustible and environmental friendly fuel source 2,3,4,5,6,7,8,9 .Electrocatalytically initiated hydrogen-and oxygen formation from water is considered an important realization of this solar to fuel conversion route 10,11,12 but is typically hampered by the high overpotentials oxygen evolution on the anode side goes with 13,14 . This is particularly true when the electrochemical cleavage of more or less untreated water is intended-; hence, when the splitting procedure is carried out at neutral pH value. 17,18,19,20,21,22,23,24 . Scheme 1 gives some idea of the position of current heterogeneous catalysts in terms of their efficiency regarding OER in neutral regime. The significant improvement of the voltage-current behavior can be taken from both-, the non-steady state ( Figure 1a) as well as the steady state polarization (Figure 1b) experiments. Results OER properties in neutral mediumThe CV of sample Co-300 shows along the entire curve substantially stronger current to voltage ratio than the CV of sample Co and reached, at the upper...

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Simple synthesis of Co3O4 nanoflakes using a low temperature sol–gel method suitable for photodegradation of dyes

Cited by 57 publications

References 10 publications

Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

Direct Hydrothermal Synthesis of Size-Controlled Co<sub>3</sub>O<sub>4</sub> Nanocubes under Highly Condensed Conditions

X20CoCrWMo10-9//Co₃O₄: a metal–ceramic composite with unique efficiency values for water-splitting in the neutral regime

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Simple synthesis of Co3O4 nanoflakes using a low temperature sol–gel method suitable for photodegradation of dyes

Cited by 57 publications

References 10 publications

Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

Preparation of electrospun Co3O4 nanofibers as electrode material for high performance asymmetric supercapacitors

Direct Hydrothermal Synthesis of Size-Controlled Co<sub>3</sub>O<sub>4</sub> Nanocubes under Highly Condensed Conditions

X20CoCrWMo10-9//Co3O4: a metal–ceramic composite with unique efficiency values for water-splitting in the neutral regime

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X20CoCrWMo10-9//Co₃O₄: a metal–ceramic composite with unique efficiency values for water-splitting in the neutral regime