Boric acid assisted electrosynthesis of hierarchical three-dimensional cobalt dendrites and microspheres

Sivasubramanian, R.; Sangaranarayanan, M.V.

doi:10.1016/j.matchemphys.2012.07.006

Cited by 15 publications

(5 citation statements)

References 62 publications

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“…5c to 5f). Similar results have been reported previously for Cocontaining systems, 19,20 where the presence of dendrites has been attributed to a modification of the growth mechanism because of the change in solution pH. A morphological analysis shows that samples deposited at pH 1 are most appropriate for anode applications.…”

Section: Chemical Composition and Morphology Of Pb-co Coatings-supporting

confidence: 88%

Electrodeposition of Lead–Cobalt Anodes: The Effect of Electrolyte pH on Film Properties

Tobosque

Maril

et al. 2017

J. Electrochem. Soc.

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Electrodeposited lead (Pb)-cobalt (Co) coatings are an effective electrocatalyst in the oxygen-evolution reaction. We studied the effect of an electrolytic bath pH on the electrodeposition of Pb-Co coatings, and the coating properties were analyzed. The pH was varied from 1 to 6 for a solution without and with ascorbic acid as complexing agent. Cathodic polarization curves show that the deposition conditions have a greater effect on the reduction potential of Co 2+ than the reduction potential of Pb 2+ . Energy-dispersive X-ray spectrometer analysis shows that a pH higher than 4 promotes Co deposition and yields a [Pb]/[Co] film ratio lower than 1. Scanning electron micrographs showed that samples grown at a pH higher than 2 were covered with Co dendrites, and that the sample grown with ascorbic acid at pH 1 exhibited a compact morphology. Anodic polarization curves showed that Pb-Co-coated anodes grown at pH 1 with a complexing agent evolved oxygen at c.a. 1.6 V vs. normal hydrogen electrode, which lead to a 40% reduction in the required overpotential (η) for the oxygen-evolution reaction compared with conventional Pb-Ca-Sn anodes.

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Section: Chemical Composition and Morphology Of Pb-co Coatings-supporting

confidence: 88%

Electrodeposition of Lead–Cobalt Anodes: The Effect of Electrolyte pH on Film Properties

Tobosque

Maril

et al. 2017

J. Electrochem. Soc.

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“…-The galvanostatic deposition of Co and its alloys have been discussed in the literature [47][48][49][50] with emphasis on electrolytic media containing boric acid. The presence of boric acid has been claimed to result in the stability of the bath 50 and as structure-directing agent.…”

Section: Galvanostatic Deposition Of Co-gqd Compositementioning

confidence: 99%

“…The presence of boric acid has been claimed to result in the stability of the bath 50 and as structure-directing agent. 47 We carried out galvanostatic deposition of cobalt in Bath B with and without boric acid in the medium. With boric acid added in the medium, the pH of the bath shifted from the original value of 6.5 to 4.5.…”

Section: Galvanostatic Deposition Of Co-gqd Compositementioning

confidence: 99%

Cobalt Deposition in Graphene Quantum Dot Bath: Electrochemical and Spectroscopic Features: A Prospective Sensor Material

Wong

Santhanam

Kandlikar

2018

J. Electrochem. Soc.

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We have demonstrated here that graphene quantum dots (GQD) bind to cobaltous ion giving it a flowery structure. As a result of this binding the cyclic voltammetric peak potential shows a cathodic shift with reference to unbound cobaltous ion. From the electrochemical data, it is estimated that Co 2+ is hexa coordinated with GQD to form the bound species. The electrochemical reduction of cobaltous ion is carried out using four baths. A spectrophotometric examination of aquo cobaltic solution shows a characteristic maximum at 508 nm that is absent when cobaltous ion is in GQD bath. Co composite has been galvanostatically deposited on metal substrates. Fourier transform infrared spectroscopy (FTIR) of Co bound GQD shows distinct peaks at 3246(broad) cm −1 , 2089 cm −1 , 1639 cm −1 , 1392 cm −1 , 1274 cm −1 , 1099 cm −1 , 536 cm −1 that can be attributed to Co-C stretching and C-C stretching. The thermogravimetric analysis (TGA) of the composite shows that it is thermally stable from decomposition up to 600 • C. The energy dispersion analysis (EDAX) of the deposited Co shows the presence of carbon and cobalt at 0.25 keV and 7.0 eV respectively. The electrochemically deposited graphene composite responds rapidly to a flowing hydrogen gas stream.

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“…Numerous studies have been carried out to investigate the effect of boric acid on the morphology of the electrodeposited cobalt [12], and on the probability of a surface adsorption process to influence the nature of nucleation and growth of the deposits in the Watts solution [13,14]. However, 1-D growth of electrodeposited cobalt has first been reported in our recent publication [15], where we suggested that careful control of the solution chemistry (esp., boric acid content), reduction current density, and temperature would yield electrodeposited cobalt nanorods without the need for a porous template (refer to Figs.…”

Section: Introductionmentioning

confidence: 99%

Cobalt Oxide Nanorods Prepared by a Template-Free Method for Lithium Battery Application

Kim

Liu

et al. 2016

Journal of Electrochemical Science and Technology

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Transition metal oxide-based electrodes for lithium ion batteries have recently attracted much attention because of their high theoretical capacity. Here we report the electrochemical behavior of cobalt oxide nanorods as anodes, prepared by a template-free, one-step electrochemical deposition of cobalt nanorods, followed by an oxidation process. The as-deposited cobalt has a slightly convex columnar structure, and controlled thermal oxidation produces cobalt oxides of different Co/ O ratios, while the original shape is largely preserved. As an anode in a rechargeable lithium battery, the Co/O ratio has a strong effect on initial capacity and cycling stability. In particular, the one-dimensional Co@Co

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Boric acid assisted electrosynthesis of hierarchical three-dimensional cobalt dendrites and microspheres

Cited by 15 publications

References 62 publications

Electrodeposition of Lead–Cobalt Anodes: The Effect of Electrolyte pH on Film Properties

Electrodeposition of Lead–Cobalt Anodes: The Effect of Electrolyte pH on Film Properties

Cobalt Deposition in Graphene Quantum Dot Bath: Electrochemical and Spectroscopic Features: A Prospective Sensor Material

Cobalt Oxide Nanorods Prepared by a Template-Free Method for Lithium Battery Application

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