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The impedance of 5 virgin faces of single crystal RuO2 was measured over the frequency range of 1-106Hz, in three electrolytes--10-~M and 1M Na2SO4 and 10-3M KF. The fastest relaxing capacitive element was identified, and its values measured as a function of the electrode potential. A maj or contribution to this capacitance is due to the double layer capacitance. The potential of zero charge in 10-3M NasSO4 was measured for the five crystalline faces. The variations of the potential of zero charge with the crystalline faces are small. "Average" value is (-0.09 -+ 0.

Rare electrochemiluminescence (ECL) sensors have been developed based on the direct regulation of ionic current because it was difficult to establish a relationship between ionic current and ECL reporting. Ionic...