Interrogating a deeply buried electrode by vibrational sum frequency spectroscopy. Towards understanding the electroreduction at ionic liquid-metal interfaces

N. García Rey, D. D. Dlott

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We used vibrational sum frequency generation spectroscopy (SFG) synchronized with cyclic voltammetry (CV) to study CO2 electroreduction on polycrystalline Ag, in a room-temperature ionic liquid (RTIL) electrolyte, 1-ethyl-3-methylimidazolium tetrafluorborate (EMIM-BF4). CO was produced from CO2 at - 1.33V (vs. Ag/AgCl). SFG measurements showed CO adsorbed on Ag, but at - 1.33V adsorption was weak, so CO did not poison Ag. At this same - 1.33 V potential, the nonresonant SFG intensity was a minimum and the curvature of the SFG intensity vs. potential relation changed dramatically. This was true whether or not CO2 was present. The SFG results indicate the RTIL undergoes a potential-driven structural transition in the double layer, and this transition controls the reduction of CO2. Adding water to the RTIL increases the efficiency of CO2 reduction and shifted the structural transition 80 mV to lower potential.

Original languageEnglish (US)
Title of host publicationSpectroelectrochemistry 3
EditorsS. Mukerjee, A. C. Hillier
PublisherElectrochemical Society Inc.
Pages21-31
Number of pages11
Edition32
ISBN (Electronic)9781607685395
DOIs
StatePublished - 2015
EventSymposium on Spectroelectrochemistry 3 - 227th ECS Meeting - Chicago, United States
Duration: May 24 2015May 28 2015

Publication series

NameECS Transactions
Number32
Volume66
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Other

OtherSymposium on Spectroelectrochemistry 3 - 227th ECS Meeting
Country/TerritoryUnited States
CityChicago
Period5/24/155/28/15

ASJC Scopus subject areas

  • Engineering(all)

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