out purging the solution with nitrogen gas. For
the residual IE curves, the formation of gold
oxides occurred at Eapproximately 300 mV,
followed by the evolution of oxygen at E
approximately 700 mV in the positive potential
scan. The reduction of gold oxides was observed
with the peak current at approximately 50 mV
followed by the reduction of dissolved oxygen at
below 100 mV in the negative scan.