Premium
Palladium thin films for hydrogen sensing in aqueous electrolytes
Author(s) -
Walkner Sarah,
Schimo Gabriela,
Mardare Andrei Ionut,
Hassel Achim Walter
Publication year - 2015
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431716
Subject(s) - palladium , cyclic voltammetry , electrolyte , thin film , hydrogen , materials science , dielectric spectroscopy , hydrogen sensor , electrochemistry , inorganic chemistry , chemical engineering , aqueous solution , analytical chemistry (journal) , nanotechnology , chemistry , electrode , catalysis , organic chemistry , engineering
In this work, differently prepared palladium films are tested toward their hydrogen sensing properties in aqueous electrolytes. The Pd thin films were either electroless deposited, electrochemically deposited, or prepared by physical vapor deposition. The outcome of each fabrication process and characteristics of the Pd films were determined by means of SEM and cyclic voltammetry. Electrochemical impedance spectroscopy was performed in order to calibrate the prepared hydrogen sensors. The Pd films react on different hydrogen concentrations in the electrolyte by changing their electrical resistivity. Elemental hydrogen can diffuse into the Pd film leading to a lattice expansion and a phase transition. A second hydrogen sensing mechanism due to a change in charge transfer resistance can be observed.