12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > The micro-optical ring electrode: Development o...
View graph of relations

« Back

The micro-optical ring electrode: Development of a novel electrode for photoelectrochemistry

Research output: Contribution in Book/Report/ProceedingsConference contribution

Published

Associated organisational unit

Publication date1997
Host publicationProceedings of the Symposium on Chemical and Biological Sensors and Analytical Electrochemical Methods
EditorsAJ Ricco, P Vanyek, G Horvai, AF Silva
Place of publicationPENNINGTON
PublisherELECTROCHEMICAL SOCIETY INC
Pages1039-1051
Number of pages13
ISBN (Print)1-56677-147-1
Original languageEnglish

Abstract

The Micro-Optical Ring Electrode (MORE), a novel photoelectrochemical device capable of delivering light via a fibre optic light guide directly to the region of electrochemical measurement. Based on a ring microelectrode and using the insulating material interior to the ring electrode as a light guide, the MORE can therefore be used to conduct microelectrochemical studies of systems with complex photochemistry. Most recently, the MORE has been used in a preliminary study of the photoelectrochemical behaviour of tris(2,2'-bipyridine)ruthenium(II) (Ru(bipy)(3)(2+)) in the presence of the oxidising quenching agent, Fe3+. Chronoamperograms have been recorded at the MORE using increasing concentrations of Fe3+. A direct correlation has been established between the recorded photocurrent and [Fe3+]. A value of the Stern-Volmer constant (k(st)) for the homogeneous quenching of photoexcited Ru(bipy)(3)(2t) by Fe3+ has been obtained from electrochemical measurements conducted using the MORE. The value of k(st) so obtained (0.4 m(3) mol(-1)) compares favourably with the value of the Stern-Volmer constant for the same reaction obtained from fluorescence measurements (0.9 m(3) mol(-1)).