Structural Evolution of Ultrathin SrFeO_3-δ Films during Oxygen Evolution Reaction Revealed by In Situ Electrochemical Stress Measurements.

ABSTRACT: We report the electrochemical stress analysis of SrFeO_3-δ (SFO) films deposited on Au substrates during oxygen evolution reactions (OERs). Our in situ analysis of Au reveals conversion reactions from Au to Au(OH)₃, AuOOH, and AuO_x during the OER. Au reactions cause a monotonic compressive stress on surfaces assigned to the formation of Au hydroxides and oxides. Electrochemical stress analysis of SrFeO_3-δ/Au shows a dramatically different behavior during the OER, which we attribute to structural evolutions and conversion reactions, such as the conversion of SFO to iron (oxy)hydroxides. Interestingly, electrochemical stress analysis of SrFeO_3-δ/Au shows a tensile trend, which evolves with cycling history. Electrochemical st

SUBMITTER: Marquez E 

PROVIDER: S-EPMC10716856 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature