Electrochemically tunable resistance of nanoporous platinum produced by dealloying

Journal
Langmuir : the ACS journal of surfaces and colloids  
Volume
32
Issue
31
Start Page
7757
End Page
7764
Citation
Langmuir 31 (32): 7757-7764 (2016-08-09)
Publisher DOI
10.1021/acs.langmuir.6b01734
Scopus ID
2-s2.0-84981354741
Publisher
ACS Publ.
The extremely high surface-to-volume ratio of nanoporous platinum (np-Pt) produced by dealloying was applied for tuning electrical resistance by surface charging. In the as-dealloyed state, a characteristic sign-inversion of the charging-induced resistance variation occurs, which can be associated with the electronic structure of PtO. After electrochemical reduction, the relative resistance variations of np-Pt of up to 58% could be generated by electrochemically induced adsorption and desorption, which was 1 order of magnitude larger compared with that of cluster-assembled nanocrystalline Pt. Although the maximum resistance variation was also higher than that of dealloyed nanoporous gold (np-Au), the resistance variation related to the imposed charge was reduced owing to the higher bulk resistance of Pt compared with that of Au. The sign-inversion behavior of the resistance could be recovered by re-oxidation.
DDC Class
600: Technik
More Funding Information
Financial support by the Graz inter-university cooperation on natural sciences (NAWI Graz) is appreciated.