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Work function of α-Fe2O3 and g-C3N4 (a). Ag 3d XPS spectra (b), the XPS spectra of C 1s (c) and N 1s (d) of g-C3N4 and Ag/α-Fe2O3/g-C3N4, the XPS spectra of O 1s (e) and Fe 2p (f) of α-Fe2O3 and Ag/α-Fe2O3/g-C3N4. (g) The formation mechanism of S-Scheme heterojunctions.
