Adsorptionsreaktionen bei der Auflösung und Abscheidung von Kobalt in Perchloratlösungen

Heusler, K. E.

doi:10.1002/bbpc.19670710615

Cited by 22 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Overall reaction Co 2+ + 2e − → Co [3] In this mechanism the reduction of Co 2+ is followed by its deposition on the electrode; this mechanism has been named as Heusler's mechanism for cobalt 4,28 in the literature. Based on Reaction 3, the cyclic voltammetric peak current is predicted to increase with increasing sweep rate.…”

Section: Table I Half-wave Potentials At Different Concentrations Of Gqdmentioning

confidence: 99%

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

Wong

Santhanam

Kandlikar

2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

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.

show abstract

Section: Table I Half-wave Potentials At Different Concentrations Of Gqdmentioning

confidence: 99%

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

Wong

Santhanam

Kandlikar

2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

Elektronenmikroskopische Untersuchung dee Kristallwachstums bei der elektrolytischen Abscheidung von Kobalt

Heusler

Knödler

1967

Ber Bunsenges Phys Chem

View full text Add to dashboard Cite

Auf der Oberfläche von elektrolytisch aus Perchloratlösungen abgeschiedenem, Kobalt wurden hexagonale Wachstumspyramiden mit der (0001)‐Fläche als Basis beobachtet. Die Pyramidenhöhe nahm mit dei Menge des abgeschiedenen Kobalts zu und war von der Überspannung unabhängig. Entsprechend der Theorie des Kristallwachstums au Schraubenversetzungen war der Tangens des Winkels zwischen. Pyramidenseitenfläche und Basis proportional der Überspannung. Der Abstand der Wachstumsstufen war umgekehrt proportional der Überspannung. Die Stufenhöhe und die spezifische Randenergie der Stufen wurden berechnet. Es wurde gezeigt, daß bei Überspannungen η < 0,2 V die Bildung zweidimensionaler Keime sehr unwahrscheinlich ist und der mittlere Abstand der Halbkristallagen an den Stufen groß gegen die Atomabstände sein muß.

show abstract

Electron Spectroscopic and Electrochemical Investigations of Chemically Modified Iron Surfaces

Volmer

Czodrowski

Stratmann

1988

Ber Bunsenges Phys Chem

View full text Add to dashboard Cite

Iron surfaces, chemically modified by n‐decanethiol (n‐DMc), have been investigated in order to get a better understanding of the corrosion protection of reactive metals by organic coatings, as investigations of the phase boundary substrate/organic coating are possible only if just monolayers of an organic monomere are adsorbed onto the metal. Electron spectroscopic (XPS, AES) and electrochemical analyses (cyclovoltammetry, rotating ring‐disc‐electrode) have shown that a stable bond between iron and n‐DMc and a well defined orientation of the organic molecules towards the surface are only observed, if the thiol is adsorbed at an oxid free substrate. In this case the oxidation of the thiol by air to disulfide, sulfenate, and sulfonate is highly inhibited. Similar results are obtained regarding the electrode reactions like metal dissolution/passivation, and H+‐reduction in an Ar‐purged borate buffer (pH = 8.5). Only oxygen can be reduced on the modified surface with high rates, the kinetics being completely different from the one on clean iron surfaces. It is proposed, that as part of the O2‐reduction the thiol is transformed into disulfide, which then catalyses the oxygen reduction but still inhibits the rate of metal dissolution and H+‐reduction. After prolonged O2‐reduction the disulfide is oxidized to sulfonate, which then desorbs from the metal surface.

show abstract

Adsorptionsreaktionen bei der Auflösung und Abscheidung von Kobalt in Perchloratlösungen

Cited by 22 publications

References 16 publications

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

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

Elektronenmikroskopische Untersuchung dee Kristallwachstums bei der elektrolytischen Abscheidung von Kobalt

Electron Spectroscopic and Electrochemical Investigations of Chemically Modified Iron Surfaces

Contact Info

Product

Resources

About