Brewton-Parker College: A Private Christian/Baptist College located in Southeast Georgia Mathematics and Natural Sciences: Biology, Chemistry, Mathematics, PhysicsMathematics and Natural Sciences: Biology, Chemistry, Mathematics, PhysicsMathematics and Natural Sciences: Biology, Chemistry, Mathematics, PhysicsMathematics and Natural Sciences: Biology, Chemistry, Mathematics, Physics

2.3 Electrochemistry of Bulk Superconducting Electrodes

Electrochemical measurements on high-temperature superconductors have been the focus of numerous studies1, 2, 5-8, 12-22 the majority of which have studied the electrochemistry of bulk ceramic electrodes. Typically, a ceramic pellet is encapsulated in an epoxy matrix. Due to the high reactivity with water, aqueous electrochemistry has yielded poor voltammetry.12, 19, 20 In contrast, non-aqueous electrochemical methods have produced voltammetry similar to that of noble metal electrodes. The acquisition of well-behaved voltammetric response requires attention to the following two important issues: the polycrystalline electrode must be properly resurfaced and steps must be taken to prevent the formation of a corrosion layer. Improper resurfacing techniques1, 2, 18 cause the response to be dominated by resistive and capacitive contributions. Several strategies to obtain a fresh electrode surface can be employed such as razor blade cleaving, sanding with coarse sandpaper, and resurfacing with a diamond scribe in an inert atmosphere glovebox. Common procedures for resurfacing noble metal electrodes such as polishing the surface with Al2O3 / H2O paste and cycling the potential of the electrode in acidic solutions prove harmful to the superconductor’s surface. In addition to requiring a fresh surface; dry, nonprotic solvents must then be used for electrochemical solutions. Since surface corrosion of YBa2Cu3O7-x plays a major role in the electrochemical response of bulk electrodes, 2, 6, 8, 18 even small amounts of water can significantly hinder electron transfer. When the electrode is resurfaced properly and care is taken to eliminate water exposure, an electrochemical response comparable to that of Pt is obtained.

Mathematics and Natural Sciences: Biology, Chemistry, Mathematics, Physics
Brewton-Parker College | Located on U.S. 280 at 201 David-Eliza Fountain Circle, P. O. Box 197, Mount Vernon, GA 30445
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The mission of Brewton-Parker College, a Georgia Baptist college, is to develop the whole student through the application of Biblically-centered truth to a liberal arts curriculum in a community of shared Christian values.
 
Brewton-Parker College is accredited by the Commission on Colleges of the Southern Association of Colleges and Schools to award associate and baccalaureate degrees. Contact the Commission on Colleges at 1866 Southern Lane, Decatur, Georgia 30033-4097 or call 404-679-4500 for questions about the accreditation of Brewton-Parker College.
 
Updated on: April 15, 2010 8:26 PM