Fig. 3
![Fig. 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12302-021-00588-7/MediaObjects/12302_2021_588_Fig3_HTML.png)
a PL spectra of g-C3N4, SnO2 and SnO2/g-C3N4 composites with different compositions of SnO2 and, b their corresponding EIS analysis plot
a PL spectra of g-C3N4, SnO2 and SnO2/g-C3N4 composites with different compositions of SnO2 and, b their corresponding EIS analysis plot