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Issue 48, 2017
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Methylamine lead bromide perovskite/protonated graphitic carbon nitride nanocomposites: interfacial charge carrier dynamics and photocatalysis

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Abstract

We demonstrate the decoration of methylamine lead bromide (MAPbBr3, MA: CH3NH3+) perovskite nanoparticles on protonated graphitic carbon nitride (p-g-C3N4) sheets to form nanocomposites (NCs) for the first time. The intrinsic type II band structure of MAPbBr3/p-g-C3N4 NCs resulted in significant charge separation properties, which were greatly beneficial for related applications in photoelectric conversion. The interfacial charge transfer behavior of MAPbBr3/p-g-C3N4 NCs was analyzed via time-resolved photoluminescence (TRPL) spectroscopy and singular-value decomposition global fitting (SVD-GF), which revealed that photoexcited electrons in the conduction band (CB) and shallow-trap (ST) states of MAPbBr3 could be transferred into the CB of g-C3N4. The fitting results for TRPL traces indicated that the control of the related compositions could modulate the interfacial charge carrier dynamics of MAPbBr3/g-C3N4 NCs. An increase in the charge transfer rate constant (ket) for MAPbBr3/g-C3N4 NCs was discovered when the constituent ratio of p-g-C3N4 was enhanced. Furthermore, we utilized MAPbBr3/p-g-C3N4 NCs as a photocatalyst to carry out the photocatalytic reduction of p-nitrophenol (PNP) under visible-light irradiation. A significant photoreduction rate (kPNP) of PNP was observed in the photocatalytic reaction, which indicated the great potential of MAPbBr3/p-g-C3N4 NCs to convert solar energy into chemical energy. In particular, the present investigation opens a new field for organolead bromide perovskites in applications in photocatalysis, as well as related photoelectric conversion.

Graphical abstract: Methylamine lead bromide perovskite/protonated graphitic carbon nitride nanocomposites: interfacial charge carrier dynamics and photocatalysis

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Publication details

The article was received on 16 Sep 2017, accepted on 13 Nov 2017 and first published on 14 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08190A
Citation: J. Mater. Chem. A, 2017,5, 25438-25449
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    Methylamine lead bromide perovskite/protonated graphitic carbon nitride nanocomposites: interfacial charge carrier dynamics and photocatalysis

    Y. Pu, H. Fan, T. Liu and J. Chen, J. Mater. Chem. A, 2017, 5, 25438
    DOI: 10.1039/C7TA08190A

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