Abstract
The adsorption of hydrogen adatoms and bisulfate anions on an Ir(111) electrode surfaces in 0.5 M H 2SO 4 solution has been investigated in situ with a combination of cyclic voltammetry (CV), infrared reflection absorption spectroscopy (IRAS) and scanning tunneling microscopy (STM) experiments. The IRAS result shows evidence for the adsorption of hydrogen adatoms occupying the on-top sites of the Ir(111) at potentials below 55 mV versus SHE (standard hydrogen electrode) where current spikes are seen in the CV profile. The STM reveals a (1×1) structure corresponding to the unreconstructed Ir(111) lattice at potentials below 55 mV. At potentials positive of the current spikes, two absorption bands at 1255–1320 and 945–956 cm −1 are present in the IR spectra with the former bands showing a higher frequency shift upon deuteration. The IRAS and STM results demonstrate that HSO 4 − anions rather than SO 4 2− anions predominantly adsorb on the Ir(111) electrode to form the characteristic (√3×√7) structure.
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.
