RGO-NiPO肖特基结的氢光合作用及其机理研究,ACS Sustainable Chemistry & Engineering

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RGO-NiPO肖特基结的氢光合作用及其机理研究
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-04-18 00:00:00 , DOI: 10.1021/acssuschemeng.9b01316
Alaka Samal ₁ , Smrutirekha Swain , Unnikrishnan Manju ₁ , Dipti P. Das ₁

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一种经济有效的光催化剂的合成，用于制备清洁的H ₂对于实际应用而言，水的分解非常重要。在这项工作中，我们已经报道了通过低温水热反应系统低成本合成还原型氧化石墨烯嵌入的磷酸镍（RGO-NiPO）光催化剂。该复合材料在可见光谱辐照下在水的光还原反应中显示出巨大的潜力。RGO-NiPO的形态分析解释了RGO与NiPO表面之间的惊人相互作用，该相互作用有效地干扰了在有光条件下的减水反应过程中电荷载流子的损失。此外，这种现象从时间分辨的光致发光光谱中得到了证明，其中12RGO-NiPO的衰变分量计算得出的衰变时间（1.40 ns）比NiPO（5.3 ns）短，这意味着有效的e ^–通过NiPO-RGO接口进行传输。NiPO纳米线在石墨烯片的表面上面对面组装，这使得纳米线和石墨烯之间的紧密接触成为可能。这种无贵金属的光催化剂可以为设计非常有效的水分解催化剂提供一种方法，预计将其应用于实际的光催化水分解工业。由于具有明显的结构和组成特权的协同效应，RGO-NiPO纳米线显示出令人钦佩的活性，其H ₂速率为9000μmol / h / g，并且在不使用任何其他助催化剂的情况下具有很高的光催化水分解稳定性。

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Hydrogen Photosynthesis through Schottky Junction of RGO-NiPO and the Perspective of the Mechanism

The synthesis of an economical and efficient photocatalyst for the fabrication of clean H₂ from water splitting is significant for the actual application. In this work, we have reported the low-cost synthesis of reduced graphene oxide embedded nickel phosphate (RGO-NiPO) photocatalyst by low-temperature hydrothermal reaction system. The composite showed great potential in the photoreduction reaction of water under visible spectrum irradiation. The morphological analysis of RGO-NiPO explains an amazing interaction between the RGO and NiPO surface which efficiently interferes with the charge carrier losses during the water reduction reaction in the presence of light. Furthermore, this phenomena was evidenced from the time-resolved photoluminescence spectra, where the decay components were calculated to have a shorter decay time (1.40 ns) in the case of 12RGO-NiPO than that of NiPO (5.3 ns), implying efficient e^– transfer across the NiPO-RGO interface. The NiPO nanostrings were face-to-face assembled on the surface of the graphene sheet, which makes the intimate contact between the nanostrings and graphene feasible. Such noble-metal-free photocatalyst may provide an approach for the design of very efficient water-splitting catalysts, which are predicted to be applied to the actual photocatalytic water-splitting industry. Owing to the synergetic effect of the distinguishable structural and compositional privileges, the RGO-NiPO nanostrings showed admirable activity with a H₂ rate of 9000 μmol/h/g and high photocatalytic water-splitting stability without the use of any other cocatalysts.

更新日期：2019-04-18

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