Abstract
A study has been made of the effect of preadsorbed sulfur layer on the anodic oxidation of formic acid at a platinized platinum electrode. It is shown that, in the presence of the preadsorbed s sulfur layer, the oxidation process obeys the following rate expression, i=nFkc αg(θ s) exp(α an Fϕr/RT) where α≈0.75 and α an≈0.5. This is explained in terms of the following rate-determining step, ( HCOOH ) a d s → C * OOH + H + + e and involves the adsorption of formic acid on the sulfur-covered electrode surface. A strong catalytic effect of the sulfur layer is observed; the function g(θ S) is greater than unity at all θ S and exhibits two maxima at г S values of 0.3 and 0.6. It is suggested that these effects arise from a coverage-dependent variation of bond strength between adsorbed sulfur and platinum. Evidence is adduced that the adsorption of sulfur from H 2S solutions involves 2-site adsorption at low coverages and 1-site adsorption at higher coverages. Possibility of multilayer adsorption under appropriate conditions is also discussed in the light of the results obtained.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
