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首页> 外文期刊>Renewable energy >Synergetic combination of 1D-2D g-C_3N_4 heterojunction nanophotocatalyst for hydrogen production via water splitting under visible light irradiation
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Synergetic combination of 1D-2D g-C_3N_4 heterojunction nanophotocatalyst for hydrogen production via water splitting under visible light irradiation

机译：1D-2D g-C_3N_4异质结纳米光催化剂的协同组合在可见光照射下通过水分解制氢

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摘要

A simple and cost-effective approach was reported for fabrication of a novel highly efficient combination of 1D-2D g-C3N4 heterojunction nanophotocatalyst (C3N4(1D-2D)) through condensation of protonated melamine by HNO3 in different solvents (water and ethanol). Structural and optical features of the samples were characterized by various physicochemical and electrochemical techniques. The results revealed utilization of ethanol as solvent instead of water completely altered the morphology of g-C3N4 from porous laminar structure (C3N4(2D)) to fibrous structure (C3N4(1D)), while leading to g-C(3)N(4)( )samples with different band gaps and energy band edges. The results of FESEM, PL, transient photocurrent and EIS nyquist measurements of C3N4(1D-2D) revealed a unique multidimensional structure, appropriate matched energy levels, excellent interfacial contact and significant charge recombination quenching, which suggested composite system as an efficient visible-lightdriven photocatalyst. Additionally, C3N4(1D-2D) isotype heterojunction exhibited significantly enhanced photoactivity toward H-2 evolution through water splitting under visible light irradiation by 2.6 and 4.1 times in comparison to individual C3N4 (1D) and C3N4(2D), respectively. This enhancement of photocatalytic activity of C3N4(1D-2D) was mainly ascribed to the efficient charge carrier separation and facile migration across the intimate interfacial of heterojunction by the well matched energy levels. The current study is expected to provide a new framework towards rational design of more efficient metal free based photocatalysts and dissimilar dimensional isotype heterojunction systems for solar energy utilization. (C) 2018 Elsevier Ltd. All rights reserved.
机译：据报道，一种简单高效的方法可通过在不同溶剂（水和乙醇）中通过HNO3缩合质子化的三聚氰胺，来制造1D-2D g-C3N4异质结纳米光催化剂（C3N4（1D-2D））的新型高效组合。通过各种物理化学和电化学技术表征了样品的结构和光学特征。结果表明，利用乙醇代替溶剂完全改变了g-C3N4的形态，从多孔层状结构（C3N4（2D））变为纤维状结构（C3N4（1D）），同时导致gC（3）N（4） （）具有不同带隙和能带边缘的样本。 C3N4（1D-2D）的FESEM，PL，瞬态光电流和EIS奈奎斯特测量结果显示出独特的多维结构，适当的能级匹配，出色的界面接触和显着的电荷复合猝灭，这表明复合系统是一种有效的可见光驱动系统光催化剂。此外，与可见的C3N4（1D）和C3N4（2D）相比，C3N4（1D-2D）同型异质结在可见光照射下通过水分解对H-2的演化表现出显着增强的光活性，分别为2.6和4.1倍。 C3N4（1D-2D）的光催化活性的增强主要归因于有效的载流子分离和易于迁移的，良好匹配的能级跨异质结的紧密界面。预期当前的研究将为合理设计更有效的无金属基光催化剂和异尺寸同质异质结系统提供新的框架，以用于太阳能利用。 （C）2018 Elsevier Ltd.保留所有权利。

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