The electrochemistry of YBa2Cu3O7–8 in aqueous potassium hydroxide

Rochani, Siti; Hibbert, David Brynn; Dou, Shi Xue; Bourdillion, A.J.; Liu, Huan; Zhou, Jiping; Sorrell, Charles Christopher

doi:10.1016/0022-0728(88)85107-6

Cited by 25 publications

(5 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Surface-active agents are often used to improve the dispersion of metals and semiconductors (10)(11)(12)(13)(14)(15)(16). Colloidal palladium, platinum, rhodium, iridium, gold, silver, and so on were prepared in the presence of surface-active agents as protective colloids, and their catalytic activities were evaluated (10)(11)(12)(13)(14). These metal particles were able to be transferred to supports without agglomeration (14).…”

Section: Introductionmentioning

confidence: 99%

“…Platinum supported on carbon catalyst was prepared by the reduction of chloroplatinic acid with methyl alcohol (10)(11)(12). Chloroplatinic acid (1.0g as platinum metal), carbon support (9.0g), and surface-active agent (10.0g) were added to a !000 ml aqueous solution containing-500 ml of methyl alcohol.…”

Section: Introductionmentioning

confidence: 99%

“…Extending the upper limit of superconductivity to temperatures as high as 125 K has greatly increased the number of possible applications for these materials. Electrochemical studies of high temperature superconductors are one application that we and others (4)(5)(6)(7)(8)(9)(10)(11)(12) have identified and are currently studying.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Epoxy‐Encapsulated Ceramic Superconductor Microelectrodes

Gollmar

McDevitt

Murray

et al. 1989

J. Electrochem. Soc.

View full text Add to dashboard Cite

A procedure is outlined for fabricating well-behaved microelectrodes from ceramic pellets of YBa2Cu307 and Bi2Sr2CaCu208 which involves systematic polishing of an epoxy-encapsulated superconductor chip, under Et4NC104/acetonitrile solution, to a potentiometric end point. Voltammetry of the resulting microelectrodes in acetonitrile is illustrated and compared to that arising from alternative superconductor electrode geometries. The microelectrodes have active electrode surface areas ranging from 2 x 10 -8 to 3 • 10 -4 cm 2, as characterized electrochemically and microscopically. The resuits discussed herein are significant steps toward developing the methodology necessary to study the electrochemical response of high temperature superconductor phases at temperatures below their superconductor critical temperature.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Epoxy‐Encapsulated Ceramic Superconductor Microelectrodes

Gollmar

McDevitt

Murray

et al. 1989

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…The use of highly alkaline solutions or non-aqueous solvents increases the stability of Cu(III), and, in some instances, it has allowed the voltammetric behavior of trivalent copper to be studied. 10,11,[13][14][15][16]18,20 Despite the presence of Cu(III) or 0(I) in the superconductor, they can act as strong oxidizing species that can be related to defect structure. Accordingly, Cu3+ ions have been formally written in the redox reaction with water.…”

Section: Resultsmentioning

confidence: 99%

Voltammetric Measurement of the Cu(III)/Cu(II) Ratio and Oxygen Content in YBa2Cu3O7-x Superconductive Materials with a Carbon-Paste Electrode

1996

View full text Add to dashboard Cite

The Cu(III)/Cu(II) content ratio of five YBa2Cu30,-x high-temperature (Ta, ca. 95 K) superconductive materials prepared under various final heating conditions was determined by differential-pulse voltammetry in an alkaline-supporting electrolyte (0.01 M NaOH). Samples were mixed into a carbon-paste electrode and deposited onto a glassy-carbon surface. A simple calculation method based on voltammetric recordings was used to evaluate the stoichiometric coefficient of oxygen, which is of major interest in the characterization of the physical (conductive and superconductive) properties of these compounds. The thus-obtained results were compared with those provided by classical iodometry. The influence of several instrumental and preparative analytical variables on the voltammograms were studied.

show abstract

“…AU metal cations in the YBa2Cu307 system, except for copper, possess only a single stable oxidation state and are not electrochemically active. Consequently, the response of the electrode is dominated by the redox chemistry of the copper ions in the corrosion phase assemblage (8,9).…”

mentioning

confidence: 99%