ChemInform Abstract: Electrochemistry at YBa2Cu3O7 Superconductor Electrodes at Temperatures Above TC.

McDevitt, John T.; Longmire, M. L.; Gollmar, R.; Jernigan, J. C.; Dalton, E. F.; McCarley, Robin L.; Murray, Royce W.; Little, W. A.; Yee, Gordon T.; Holcomb, Matthew J.; Hutchinson, J. E.; Collman, James P.

doi:10.1002/chin.198823013

Cited by 3 publications

(21 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thinner A1203 layer is not resolved from the superconductor phase in the micrograph. The currents, of course, rise at more extreme potentials (not shown) that are roughly the same as those described earlier for epoxy-encapsulated superconductor macroelectrodes and microdisk electrodes (15,17,18). Furthermore, the Bi2Sr2CaCu208 surface is quite dense.…”

Section: Resultssupporting

confidence: 78%

“…These results usefully add to the methodology we are assembling (15,17,18) to conduct electrochemical experiments at superconducting electrodes at temperatures below the Tc values in a new cryosolvent for fluid electrolytes (19). The measured currents are interpretable by standard microband electrode theory, indicating that the methodologies described are successful in obtaining electrodes with reasonably pristine surfaces.…”

Section: Resultsmentioning

confidence: 64%

“…A scanning electron micrograph from a cross-sectional perspective is shown in Fig. Electrochemical response of BizSrzCaCu20s superconductor microbands.--As described in previous publications (15,17,18), aprotic solvents can be employed for voltammetric studies to evaluate electron transfer and diffusional characteristics at superconductor electrodes. The left portion of the micrograph represents the MgO substrate, and the lighter central band the Bi2Sr2CaCu2Os/A120~ layer.…”

Section: Resultsmentioning

confidence: 99%

“…3. Aqueous and other acidic media like HC104 (40) produce corrosion effects which result in the accumulation of nonsuperconducting residues on the electrode surface which thereafter interfere with facile electron-transfer reactions (17). The thinner A1203 layer is not resolved from the superconductor phase in the micrograph.…”

Section: Resultsmentioning

confidence: 99%

“…Manuscript submitted Sept. 17,1990; revised manuscript received Nov. 20, 1990. The University of North Carolina at Chapel Hill assisted in meeting the publication costs of this article.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Preparation, Characterization and Room Temperature Electrochemical Response of Bi2Sr2CaCu2 O 8 Superconductor Microband Electrodes

McDevitt

Murray

Shah

1991

J. Electrochem. Soc.

View full text Add to dashboard Cite

Fabrication of a well-behaved superconductor microband electrode fashioned from the edges of thin films of Bi2Sr2CaCu~O8 sandwiched between two insulating layers is demonstrated. In room temperature solutions of redox species, these microbands exhibit well-defined voltammograms and currents interpretable by standard microband electrode theory. The behavior of freshly cleaved electrodes indicates preparation of reasonably pristine surfaces. The new superconductor electrode geometry along with the recently reported fluid electrolyte cryosolvent will be useful in the context of future experiments with superconductor electrodes at temperatures below their T~ values. The first results for doublelayer capacitance of a superconductor/electrolyte solution interface are also provided. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.192.114.19 Downloaded on 2015-06-20 to IP

show abstract

Section: Resultssupporting

confidence: 78%

Section: Resultsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Manuscript submitted Sept. 17,1990; revised manuscript received Nov. 20, 1990. The University of North Carolina at Chapel Hill assisted in meeting the publication costs of this article.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Preparation, Characterization and Room Temperature Electrochemical Response of Bi2Sr2CaCu2 O 8 Superconductor Microband Electrodes

McDevitt

Murray

Shah

1991

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

Direct electron transfer involving free-solute ferrocene in fluid electrolyte on an oxocuprate (Bi(Pb) 2223) electrode in the superconducting state

Green¹,

Rosseinsky²,

Toohey³

1992

J. Am. Chem. Soc.

View full text Add to dashboard Cite

rigidly held planar geometry of PAMs promotes cooperative, ?M interactions among several pairs of aromatic rings in neighboring molecules. Consequently, weak interactions between a single pair of aromatic rings that may be difficult to observe in small molecules are amplified by the PAM molecular architecture.I6 Because our synthetic chemistry allows aromatic functionalities to be varied easily, PAMs should provide a unique opportunity to study substituent effects on a-stacking interactions. K , , . was also found to vary significantly with temperature.According to van't Hoff analyses, Lw = -5.0 f 0.2 kcal mol-' and AS = -9.2 f 0.8 cal mol-' IC1. Surprisingly, PAM 2, with alternating alkoxyl and ester groups, was found to have a smaller dimerization constant than 1 at 20 OC (K, = 18 M-I). Further studies give AH = -5.6 f 0.3 kcal mol-' and AS = -13.6 * 1.0 cal mol-] K-' for the self-association of 2. These results suggest that donoracceptor interactions between alkoxyl and ester groups slightly favor *-stacking enthalpically, but disfavor a-stacking entropically relative to 1. Overall, the entropy effect dominates near ambient temperature, resulting in a decrease in K , , for 2.The difference in AS might also indicate that the dimer pair of 2 is more highly ordered than that of 1. For 3, which has segregated alkoxyl and ester groups, it was found that K , , = 26 M-', AH = -5.1 f 0.3 kcal mol-', and AS = -10.8 f 1.0 cal mol-'

show abstract

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

ChemInform Abstract: Electrochemistry at YBa2Cu3O7 Superconductor Electrodes at Temperatures Above TC.

Abstract: Well‐behaved electrodes of relatively small dimensions can be prepared from ceramic pellets of YBa2Cu3O7 potted in epoxy.

Cited by 3 publications

References 1 publication

Preparation, Characterization and Room Temperature Electrochemical Response of Bi2Sr2CaCu2 O 8 Superconductor Microband Electrodes

Preparation, Characterization and Room Temperature Electrochemical Response of Bi2Sr2CaCu2 O 8 Superconductor Microband Electrodes

Direct electron transfer involving free-solute ferrocene in fluid electrolyte on an oxocuprate (Bi(Pb) 2223) electrode in the superconducting state

Epoxy‐Encapsulated Ceramic Superconductor Microelectrodes

Contact Info

Product

Resources

About