Fig. 4: In situ experiments and mechanism exploration.
From: Magnetically tunable selectivity in methane oxidation enabled by Fe-embedded liquid metal catalysts
a, NAP-XPS spectra for Fe–LMS (1 wt% iron loading) in a vacuum environment. cps, counts per second. b, NAP-XPS spectra for Fe–LMS (1 wt% iron loading) in a 0.13-mbar H2O2 solution (30%) vapour atmosphere. c, NAP-XPS spectra for Fe–LMS (1 wt% iron loading) following a 24-h exposure to a 0.13-mbar H2O2 (30%) vapour atmosphere. d, NAP-XPS spectra for dispersed-state and aggregated-state catalysts. e, Iron K-edge EXAFS spectra in R space recorded without a magnetic field for pristine Fe–LMS, Fe–LMS immersed in H2O2, and Fe–LMS under reaction conditions. f, Partially enlarged image of c (dashed line indicates the peak position). g, Iron K-edge EXAFS spectra in R space recorded under a 500-G magnetic field for pristine Fe–LMS, Fe–LMS–B immersed in H2O2, and Fe–LMS–B under reaction conditions. h, Partially enlarged image of d (dashed line indicates the peak position). i, Iron K-edge EXAFS spectra in R space recorded under a 500-G magnetic field for Fe–LMS–B with H2O2, Fe–LMS–B under reaction conditions, and Fe–LMS–B with an additional 1 bar and 5 bar CO beyond the reaction conditions. j, Schematic diagram of reversible regulation of structure changes by magnetic field switches leading to changes in reaction pathways.
