Electrochemical actuation behaviors of bulk nanoporous palladium in acid and alkaline solutions. (1st December 2016)

• Record Type: Journal Article
• Authors: Zhang, Jie; Wang, Ying; Si, Conghui; Bai, Qingguo; Ma, Wensheng; Gao, Hui; Zhang, Zhonghua
• Is Part Of: Electrochimica acta. Volume 220(2016)
• Page Start: 91
• Page End: 97
• Publication Date: 2016-12-01
• Subjects: Electrochemical actuation -- bulk nanoporous palladium -- stress-charge coefficient -- hydrogen adsorption/absorption -- dealloying; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.10.091
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Bulk nanoporous Pd rod fabricated by dealloying shows distinct electrochemical actuation behaviors in acid and alkaline solutions. Highlights: Np-Pd shows different electrochemical actuation behaviors in acid/alkaline solutions. ξ exhibits inverse signs associated with H/OH-adsorption/desorption in KOH solutions. Strain amplitude of np-Pd can be regulated by being triggered in different solutions. Abstract: Metallic actuators have attracted a great deal of attention owing to their potential advantages over piezoelectric ceramics and conducting polymers. Here, we report different electrochemical actuation behaviors of bulk nanoporous palladium (np-Pd) fabricated by dealloying in acid (0.5 M H2 SO4 ) and alkaline (1.0 M KOH) solutions. In the 1.0 M KOH solution, the reversible expansion/contraction of np-Pd well responds to the adsorption/desorption of involved species (H and OH). In the 0.5 M H2 SO4 solution, only continuous contraction can be observed in the potential region involving the H-adsorption/desorption, but the reversible strain appears in the potential region related to the OH-adsorption/desorption. Moreover, the surface stress-charge coefficient (ξ) exhibits inverse signs associated with the H-adsorption (absorption)/desorption and OH-adsorption/desorption in the alkaline solution. More importantly, the reversible strain amplitude of np-Pd can be regulated by changing the potential scan rate or by being stimulated in different electrolytes.