Abstract
Metallic actuators have recently aroused great interests, and alloying of noble element with earth-abundant metal is essential to lower the cost of actuation materials while keeping a significant strain response. Here, we report the design/fabrication of bulk nanoporous nickel-palladium alloy by dealloying. The alloy with a hierarchically porous structure shows different actuation behaviors in different electrolytes, which are correlated with the adsorption/desorption of hydrogen/hydroxyl and the nature (clean or oxide-cover) of ligament surface. The maximum reversible strain of the nickel-palladium actuator could reach 0.47% in potassium hydroxide solution, which is more competitive compared with other metallic actuation materials.
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