6533b7d3fe1ef96bd126166a

RESEARCH PRODUCT

Identification of passive layers on Co in Alkaline solutions by photocurrent spectroscopy

Monica SantamariaE. AdragnaF. Di Quarto

subject

BORATE BUFFER SOLUTION; SEMICONDUCTIVE PROPERTIES; FILM;PhotocurrentMaterials scienceStandard hydrogen electrodeSEMICONDUCTIVE PROPERTIESBand gapGeneral Chemical EngineeringAnalytical chemistryBORATE BUFFER SOLUTIONElectronegativitySettore ING-IND/23 - Chimica Fisica ApplicataBORATE BUFFERElectrochemistryGeneral Materials ScienceElectrical and Electronic EngineeringPhysical and Theoretical ChemistrySpectroscopyElectrolyte compositionFILM

description

The photoelectrochemical behavior of passive films on Co has been studied as a function of the polarizing voltage and electrolyte composition. Passive layers formed at 0 V (standard hydrogen electrode, SHE) in 0.1 M NaOH consisted of Co(OH) 2 , whose bandgap value has been found to be 1.85 eV. Higher bandgap values (2.75 eV) have been measured for passive films formed in borate buffer at 0 V (SHE), which are mainly consist of CoO. The Eg values have been related to the film composition on the basis of a correlation between the bandgap of passive films and the electronegativity of their constituents.

yearjournalcountryeditionlanguage
2005-01-01
http://hdl.handle.net/10447/17434