Surface chemistry study of RuO2/IrO2/TiO2 mixed-oxide electrodes.
DSA metal oxide electrodes such as the RuO(2)/IrO(2)/TiO(2) mixed system are widely studied for their excellent electrocatalytic activity. In order to understand their catalytic properties, the comprehension of the surface chemistry involved during electrochemical treatments is crucial. With this aim, RuO(2)/IrO(2)/TiO(2) mixed-oxide electrodes having various noble metal contents were studied by means of secondary ion mass spectrometry (SIMS). In particular, cathodic and anodic polarization and O(2) evolution reactions were carried out to test the electrode behaviour and SIMS analyses were performed after all these treatments. In this way, surface changes induced by electrochemical treatments and depending on electrode composition were widely investigated by SIMS, revealing, for example, the presence of hydration or preferential dissolution phenomena induced by electrochemical processing.
Barison
Simona
S
Istituto per l'Energetica e le Interfasi (IENI), CNR, Corso Stati Uniti 4, 35127 Padova, Italy. s.barison@ieni.cnr.it
Daolio
Sergio
S
Fabrizio
Monica
M
De Battisti
Achille
A
D004563:Electrochemistry / Q000295:instrumentation*; D004566:Electrodes; D007495:Iridium / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D017975:Ruthenium Compounds / Q000737:chemistry*; D018629:Spectrometry, Mass, Secondary Ion / Q000379:methods; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D010087:Oxides; D017975:Ruthenium Compounds; D007495:Iridium; D014025:Titanium