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The construction of an electromechanical actuator with large displacement, with fast time response, and without electrolytic gas evolution in pure water or saline is described. Improvement in the previously reported platinum−polymer electrolyte membrane composite was made by switching to gold, deposited by the “impregnation−reduction method”, using cationic gold complexes and reducing agents. The gold-composite actuator showed larger displacements than the platinum composite at the same voltage and at lower loading. In addition, no gas evolution occurred up to the maximum applied voltage [>2.0 V], due to the much higher overvoltage for hydrogen and oxygen evolution on gold.

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