The effective photocatalytic water splitting to simultaneously produce H2 and H2O2 over Pt loaded K-g-C3N4 catalyst

In this work, for the first time, we prepared Pt loaded K+ doped graphitic carbon nitride (g-C3N4) catalyst for photocatalytic water splitting to produce H-2 and H2O2 simultaneously without any sacrificial agent. Both products are high-value chemicals and in gas-liquid two phases, which avoid the trouble of separation. XRD, N-2 adsorption, UV-Vis, SEM, TEM, PL, XPS and ESR were used to characterize the as-prepared catalysts. The CB and VB of as-prepared catalysts can be adjusted from -1.29 V and + 1.4 V for g-C3N4 to -0.18 V and + 2.3 V for KCN(8) by controlling the K+ concentration. The reaction result indicates that a moderate band position is significantly important for effective photocatalytic water splitting to simultaneously produce H-2 and H2O2. After loading of Pt to promote the electron-hole separation efficiency, Pt-KCN(5) displays the H-2 and H2O2 production abilities of 550 mu mol.g(-1).h(-1) and 620 mu mol.g(-1), simultaneously. This work opens a new window for photocatalytic water splitting research. (C) 2019 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.