Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.3059
Publisher DOI: 10.1002/aelm.201900364
Title: Electrochemical mechanics of metal thin films : charge-induced reversible surface stress for actuation
Language: English
Authors: Cheng, Chuan 
Grant, Patrick S. 
Lührs, Lukas 
Keywords: charge-induced surface stress; electrocapillaries; electrochemical actuators; metal thin films; nanoporous metals
Issue Date: 1-Jan-2020
Source: Advanced Electronic Materials 6 (1): 1900364 (2020)
Abstract (english): 
The intrinsic charge-induced surface stress of Ni thin films during electrochemical reactions with an alkaline electrolyte is measured in situ. Surface stresses induced by H absorption/desorption, α-Ni(OH)2 formation, capacitive double-layer charging, the α- to β-Ni(OH)2 transformation, and β-Ni(OH)2/β-NiOOH redox reactions are identified, and each provided additive contributions to the overall stress state. Surface stresses are magnified in high-surface-area nanoporous Ni because local stress-relaxation mechanisms are restricted when compared to a smooth Ni film. Ni film reversible tensile/compressive surface stresses correlate with anodic/cathodic potential scanning but with an opposite trend to that of a less reactive Au film. Surface stresses in the Ni films are up to 40 times that of Au films and suggest the possibility of using controlled surface-stress generation for electrochemical actuation.
URI: http://hdl.handle.net/11420/4316
DOI: 10.15480/882.3059
ISSN: 2199-160X
Journal: Advanced electronic materials 
Institute: Werkstoffphysik und -technologie M-22 
Document Type: Article
Project: Projekt DEAL 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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