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Electrode Array GK-12 Meeting November 2 nd 2010

Electrode Array GK-12 Meeting November 2 nd 2010. Megan Easterly. Electrochemistry. Oxidation Loss of electrons Electrode removes electrons from the solution Anodic peak current Reduction Gain of electrons Electrode gives electrons to the solution Cathodic peak current. Electrodes.

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Electrode Array GK-12 Meeting November 2 nd 2010

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  1. Electrode ArrayGK-12 MeetingNovember 2nd 2010 Megan Easterly

  2. Electrochemistry • Oxidation • Loss of electrons • Electrode removes electrons from the solution • Anodic peak current • Reduction • Gain of electrons • Electrode gives electrons to the solution • Cathodic peak current

  3. Electrodes • Working (WE) • Where the reaction of interest occurs • Current is measured • Reference (RE) • Measures WE potential by maintaining a stable potential • Auxillary (AE) • Electron provider/remover • Electrolyte • Electrically conductive solution

  4. 2 1 8 7 aux ref 3 4 5 6 Gold Electrode Array • 8 Au working • 1 Au reference • 1 Au auxillary • Study FDCA

  5. Ferrocenedicarboxylic Acid (FDCA) • E0 ferrocene = +0.361 V vs. NHE Bard, A.; Faulkner, L., “Electrochemical Methods. Fundamentals and Applications” 2nd Ed. Wiley, New York. 2001 Image courtesy of Dr. Karst research group: http://www.uni-muenster.de/Chemie.ac/karst/research/projects/hyphenated%20techniques.htm

  6. The Math • Randles-Sevcik equation Bard, A.; Faulkner, L., “Electrochemical Methods. Fundamentals and Applications” 2nd Ed. Wiley, New York. 2001

  7. Simultaneous Detection • External reference and auxillary

  8. Simultaneous Detection • Normalized currents to electrode area • Linearity • > 0.9990 • Sensitivity (μA*mm-2*mM-1) • Ox 1.43 ± 0.07 • Red -1.46 ± 0.07

  9. DPV of FDCA • Optimal potential determination • vs. AgAgCl • 0.43 V • vs. Au • 0.37 V • Ran individually

  10. Amperometry of FDCA • On-chip reference and auxillary • 0.37 V • Individual detection

  11. Amperometry of FDCA • Normalized to electrode area • Linearity • > 0.9987 • Sensitivity • 22.44 ± 12.93 nA*mm-2*mM-1

  12. New Mask • Well defined areas • Working = 0.09 mm2 • Reference = 2.25 mm2 • Auxillary = 2.25 mm2 • Spacing = 0.3 mm

  13. Future Work • Fabrication of new electrode array • Chemiluminescence detection of NO donor • Calibration of electrodes using NO • Modification of Au array • Nafion • Polypyrrole Diab, N.; Oni, J.; Schulte, A.; Radtke, I.; Blochl, A.; Schuhmann, W., Talanta, 61, 2003, 43-51

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