Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 110, Issue 50, Pages 25158-25162Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp063579h
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We study the photoreduction of adsorbed copper ions onto Au nanoparticles, on an indium tin oxide (ITO) electrode in an aqueous electrochemical cell, as a function of applied voltage and laser intensity. The photocurrent is a nonlinear function of laser intensity and increases sharply with cathodic voltage in the underpotential deposition region. The photoreduction is attributed to laser heating of the Au nanoparticles rather than hot electron processes. Numerical simulation of the Butler-Volmer kinetic equation using experimental parameters predicts a several orders of magnitude increase in current for a temperature rise of a few Kelvin.
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