Synthesis and “Two Channel Pathway” Photocatalytic H2O2 Production Ability of Band Gap Tunable K+ Doped Graphitic Carbon Nitride†

doi:10.7503/cjcu20170814

Abstract

Abstract:

Band gap tunable K⁺ doped graphitic carbon nitride was synthesized. Photocatalytic H₂O₂ production ability of as-prepared catalyst was investigated. X-ray diffraction(XRD), N₂ adsorption analysis, scanning electron microscopy(SEM), UV-Vis, photoluminescence(PL) and X-ray photoelectron spectroscopies(XPS) and electrochemical impedance spectrometry(EIS) were used to characterize the obtained catalysts. The results indicate that K⁺ doping not only promotes the specific surface area(S_BET), visible light absorption and separation rate of electron-hole pairs, but tunes the CB and VB positions of as-prepared catalysts by controlling the K⁺ doping amount. Such tunable band potential results in the photocatalytic H₂O₂ production from “single channel pathway” to “two channel pathway”. One pathway is that photoelectrons reduce oxygen to generate hydrogen peroxide, the other is that VB holes oxidize OH^- to form ·OH, which subsequently react with each other to form hydrogen pero-xide. Such “two channel pathway” leads to the promoted H₂O₂ production ability. This work provides a new idea of catalyst preparation for photocatalytic hydrogen peroxide production.

Key words: g-C₃N₄, K⁺ doping, Band gap tuning, Photocatalysis, H₂O₂ production

CLC Number:

O644

TrendMD:

WANG Hui, PEI Yanbo, HU Shaozheng, MA Wentao, SHI Shuoyu. Synthesis and “Two Channel Pathway” Photocatalytic H₂O₂ Production Ability of Band Gap Tunable K⁺ Doped Graphitic Carbon Nitride^†[J]. Chem. J. Chinese Universities, 2018, 39(7): 1503.

Figures/Tables 8

Fig.1 XRD patterns of GCN(a), K-GCN(0.5%)(b), K-GCN(1%)(c) and K-GCN(2%)(d)

Fig.2 SEM images of GCN(A) and K-GCN(1%)(B)

Fig.3 N2 adsorption-desorption isotherm(A) and UV-Vis spectra(B) of as-prepared catalysts

Fig.4 XPS spectra of as-prepared GCN(a) and K-GCN(1%)(b) in the region of C1s(A), N1s(B), K2s(C) and the possible K+ doping position(D)

Fig.5 VB XPS(A) and band position(B) of as-prepared catalysts

Fig.6 PL(A) and EIS(B) spectra of as-prepared catalysts^ a. GCN; b. K-GCN(0.5%); c. K-GCN(1%); d. K-GCN(2%).

Fig.7 Photocatalytic H2O2 production ability of as-prepared catalysts(A) and the H2O2 production abilities of GCN and K-GCN(1%) under different reaction conditions(B)^a. GCN; b. K-GCN(0.5%); c. K-GCN(1%); d. K-GCN(2%).

Fig.8 Influence of various scavengers on the photocatalytic H2O2 production ability of as-prepared catalysts(A) and catalytic stability of K-GCN(1%)(B)

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Synthesis and “Two Channel Pathway” Photocatalytic H₂O₂ Production Ability of Band Gap Tunable K⁺ Doped Graphitic Carbon Nitride^†

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