Laser induced current transients applied to a Au(111) single crystal electrode. A general method for the measurement of potentials of zero charge of solid electrodes

The current transients arising after the sudden heating of an electrode by high-power laser irradiation have been studied. The method has been applied to a Au(111) single-crystal electrode in contact with perchloric and sulfu ric acid solutions. The current transient can be explained as due to the re covery of the double layer capacity after its decrease due to the sudden ri se of the temperature. It has been found that there is a correlation betwee n the sign of the current transient and the sign of the double layer charge , and there is a coincidence between the potential where the transient vani shes and the potential of zero charge. This allows its use as a general met hod for determination of the potential of zero charge of solid electrodes.