Reactivity of Perovskites with Water: Role of Hydroxylation
in Wetting and Implications for Oxygen Electrocatalysis
Version 2 2017-08-12, 13:31
Version 1 2016-02-13, 05:47
Posted on 2017-08-12 - 13:31
Oxides are instrumental to applications
such as catalysis, sensing,
and wetting, where the reactivity with water can greatly influence
their functionalities. We find that the coverage of hydroxyls (*OH)
measured at fixed relative humidity trends with the electron-donor
(basic) character of wetted perovskite oxide surfaces. Using ambient
pressure X-ray photoelectron spectroscopy, we report that the affinity
toward hydroxylation, coincident with strong adsorption energies calculated
for dissociated water and hydroxyl groups, leads to strong H bonding
that is favorable for wetting while detrimental to catalysis of the
oxygen reduction reaction (ORR). Our findings provide novel insights
into the coupling between wetting and catalytic activity and suggest
that catalyst hydrophobicity should be considered in aqueous oxygen
electrocatalysis.
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Stoerzinger, Kelsey
A.; Hong, Wesley T.; Azimi, Gisele; Giordano, Livia; Lee, Yueh-Lin; Crumlin, Ethan J.; et al. (2016). Reactivity of Perovskites with Water: Role of Hydroxylation
in Wetting and Implications for Oxygen Electrocatalysis. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.5b06621
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AUTHORS (10)
KS
Kelsey
A. Stoerzinger
WH
Wesley T. Hong
GA
Gisele Azimi
LG
Livia Giordano
YL
Yueh-Lin Lee
EC
Ethan J. Crumlin
MB
Michael D. Biegalski
HB
Hendrik Bluhm
KV
Kripa K. Varanasi
YS
Yang Shao-Horn
KEYWORDS
Perovskiteambient pressure X-ray photoelectron spectroscopyHydroxylationoxygen electrocatalysisReactivityRolewetted perovskite oxide surfacesWettingnovel insightshydroxylationOxygen Electrocatalysis Oxidesapplicationreactivityfindingaffinityhydroxyl groupscatalyst hydrophobicityfunctionalitiecoverageoxygen reduction reactionImplicationelectron-donoradsorption energieshumidity trendsOHORR