02437cam a2200349Ma 4500011449748MiAaHDL20141009010000.0m d cr bn ---auaua011220s1972 dcua bt f000 0 eng dsdr-uiuc6405275(OCoLC)643028061TRLSTFUIUUTL500.T33 72-00260NAS 1.14:D-6589NASA-TN-D-6589Del Duca, Betty S.Electrochemical behavior of the boron anode in aqueous solutions /by Betty S. Del Duca.Washington, D.C. :National Aeronautics and Space Administration,1972.16 p. :ill. ;28 cm.NASA technical note ;NASA TN D-6589Prepared by Lewis Research Center.N72-13103.Includes bibliographical references (p. 15-16).The electrochemical oxidation of p-type boron in 0.2 N NaNO3 solutions of pH 0.4 to 13.1 was studied by galvanostatic techniques. The capacitance of the electrode, Tafel slopes, and a limited analysis of reaction mechanisms are reported. The anodic dissolution in acid solution is a charge-transfer-limited one-electron reaction to form a monovalent species in the over-potential region of 0.25 to 0.70 V. The dissolution in basic solution is most probably a one-electron charge-transfer reaction from a monovalent to divalent species involving three hydroxyl ions. Open circuit potentials were mixed potentials, probably due to hydrogen formation at open circuit but not contributing to the electrochemical reaction at the applied overpotential. Exchange current, estimated by extrapolation of the Tafel line to the standard oxidation potential for the boron reaction, were of the order of 10 to the minus 6th power A/cm2 in acid solution and 10 to the minus 12th power A/cm2 in basic solution. The reaction order of the rate determining acidic and basic reactions was determined with regard to (H) and (OH-). The level of illumination had no effect on the electrochemical behavior of the electrode.Mode of access: Internet.Electrochemistry.Anodes.Boron.United States.National Aeronautics and Space Administration.Lewis Research Center.01144974820101111100551.020141009010000.020141112165512.02025-01-01T19:27:33Z2025-01-01T18:30:02ZSDR-UIUCUNKNOWNloader.pl-003-020BKsdr-uiuc6405275uiugSDRUIUCuiug.30112106693218UIU6405275UIUUIUC20250101googleuiug.301121066932181972pdbibUS fed doc