Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 800, Issue -, Pages 19-24Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2016.12.034
Keywords
Electric double layers; Surface restructure; Photodesorption; Hydrophobic hydration shell; Hydrophilic hydration shell; Surface-enhanced IR absorption spectroscopy
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Funding
- PRESTO/JST program Chemical Conversion of Light Energy [16H04188]
- MEXT [16H00852]
- Grants-in-Aid for Scientific Research [16H00852, 16H04188] Funding Source: KAKEN
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Structural changes in water layers on a CO-covered Pt electrode triggered by rapid pulsed laser heating of the interface are studied using potential transient measurements. When the laser energy density is below 20 mJ cm(-2), the water layers undergo a change in orientation, which causes a negative shift in the rest potential that recovers within 20 ps with the cooling of the interface. In contrast, when the laser intensity exceeds 20 mJ cm(-2), the CO is desorbed and the rest potential first experiences a positive shift, which is followed by a negative shift. This positive shift is caused by replacement of the CO by water and subsequent restructuring of the water layer. The restructuring rate depends strongly on the electrolyte cation: the rest potential reaches a maximum value within 100 ps for hydrophilic cations such as H+ and Li+, whereas it takes >10 ms for hydrophobic cations such as Et4N+ and Bu4N+. Surface-enhanced IR absorption measurements suggest that the water molecules around the hydrophobic cations are more strongly hydrogen-bonded than those around the hydrophilic cations. Because the restructuring involves a reforming of the hydrogen-bonding network at the electric double layer, Et4N+ and Bu4N+, which have more strongly hydrogen-bonded hydration shells, require more time than H+ and Li+. (C) 2016 Elsevier B.V. All rights reserved.
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