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(a) UV−vis absorption spectra and (inset) corresponding band gap energies of C3N4 and CDs/C3N4; (b) XPS valence band for C3N4 and CDs/C3N4; (c) energy band diagrams of C3N4 and CDs/C3N4; (d) steady-state PL spectra (365 nmexcitation); (e) transient state photoluminescence spectra of C3N4 and CDs/C3N4; (f) EIS Nyquist plots of C3N4 and CDs/C3N4 electrodes.
