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Gram-Scale Synthesis of Aligned C3N4-Polypyrrole Heterojuction Aerogel with Tunable Band Structures as an Efficient Visible and Near Infrared Light -Driven Metal-Free Photocatalyst

Abstract

The assembly of aligned porous materials from simple building blocks is of widespread interest for engineering materials with enhanced and synergistic properties. To date, however, how to develop 3D heterojuction aerogels with aligned porosity based on 2D semiconductor materials and 1D conducting polymer for solar energy conversion in the visible and near-infrared (NIR) light region still remains a significant challenge. Here a new class of gram-scale 3D aligned heterojuction aerogels of polypyrrole (PPy)/C3N4 nanosheets (NSs) were designed and synthesized by directional freezing of polypyrrole (PPy)/polyvinyl alcohol (PVA) and C3N4 NSs aqueous suspension. The synthesis of aligned C3N4-PPy heterojuction aerogel can be achieved at large scale. The formed aerogel expresses stable and uniform dispersion of the two building blocks, long-range channel aligned structures along the whole monolithic sample, and additional special complementary optical properties between PPy and C3N4 NSs. Based on the above unique structure and optical property, this novel metal-free heterojunction aerogel exhibits excellent photocatalytic activity and long-term stability for direct arylation of heteroaromatics under visible and near infrared (NIR) light irradiation at room temperature, far exceeding those of the single- and two-component systems. Our work therefore not only provides a new approach to obtain aligned heterojuction aerogels based on metal free semiconductors but also paves a way to develop gram-scale aerogel as a new type of highly efficient visible and NIR light induced heterogeneous photocatalyst

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Publication details

The article was received on 22 Sep 2017, accepted on 08 Nov 2017 and first published on 09 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08389K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Gram-Scale Synthesis of Aligned C3N4-Polypyrrole Heterojuction Aerogel with Tunable Band Structures as an Efficient Visible and Near Infrared Light -Driven Metal-Free Photocatalyst

    J. Liu, H. Wang, J. Bai, T. Li, Y. Yang, Y. Peng and B. Wang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08389K

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