Fig. 3: Structural stability of ZnIn2S4.
From: Stabilizing indium sulfide for CO2 electroreduction to formate at high rate by zinc incorporation
a, b XRD patterns of ZnIn2S4 (a) and In2S3 (b) after CO2 /Subscript> electrolysis under various current densities for 10 min. c Corresponding SEM images of ZnIn2S4 (above) and In2S3 (bottom). Scale bars, 1 μm (above) and 500 nm (bottom). d–g Raman spectra of ZnIn2S4 (d) and In2S3 (e), and S 2p XPS spectra of ZnIn2S4 (f) and In2S3 (g) after CO2 electrolysis for various times at 300 mA cm−2. h STEM-EDX elemental mappings of ZnIn2S4 (scale bar: 1 μm) and In2S3 (scale bar: 600 nm) after running for 60 h and 8 h at 300 mA cm−2, respectively. i SEM-EDX measurements of the remained sulfur in catalysts after running for various times at 300 mA cm−2. The error bars represent the standard deviation of three independent measurements. j TEM (above, scale bars: 50 nm) and SAED patterns (down, scale bars: 5 1/nm) of ZnIn2S4 catalyst after CO2 electrolysis for various times at 300 mA cm−2.
