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Fe2O3 hexagonal nanosheets assembled with NiS formed p-n heterojunction for efficient photocatalytic hydrogen evolution

机译:Fe2O3六方纳米片与NiS组装形成p-n异质结,实现高效光催化析氢

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摘要

In the field of photocatalysis, the recombination of photogenerated holes and electrons is still an urgent problem to be solved. Among many measures, constructing heterojunction is one of the commonly used methods to adjust the carrier transfer path and accelerate the electron transfer. In this paper, Fe2O3/NiS p-n heterojunction composite catalyst was synthesized by solvothermal method. Through XRD, SEM and XPS characterization and analysis, it was found that the composite catalyst was composed of NiS nanoparticles and hexagonal Fe2O3 nanosheets. The specific surface area test results showed that Fe2O3/NiS had a larger specific surface area, which could provide more active sites for the H-2 production reaction. By adjusting the ratio between Fe2O3 and NiS, the optimal composite photocatalyst was obtained. The hydrogen production rate reached 5.82 mmol g(-1) h(-1), which was 58.2x that of single Fe2O3 and 2.7x that of single NiS. The NiS p-type semiconductor and Fe2O3 n-type semiconductor were successfully coupled. Under the action of the p-n heterojunction interface and the built-in electric field, the photogenerated electrons and holes of the composite catalyst could be quickly transferred and separated. This result was also confirmed by a series of characterizations such as photoluminescence spectrum and photoelectrochemical experiments.
机译:在光催化领域,光生空穴和电子的复合仍然是一个亟待解决的问题。在众多措施中,构建异质结是调整载流子转移路径和加速电子转移的常用方法之一。本文采用溶剂热法合成了Fe2O3/NiS p-n异质结复合催化剂。通过XRD、SEM和XPS表征分析,发现复合催化剂由NiS纳米颗粒和六方Fe2O3纳米片组成。比表面积测试结果表明,Fe2O3/NiS具有较大的比表面积,可为H-2生成反应提供更多的活性位点。通过调节Fe2O3与NiS的配比,得到了最佳的复合光催化剂。产氢速率达到5.82 mmol g(-1) h(-1),是单个Fe2O3的58.2倍,是单个NiS的2.7倍。NiS p型半导体和Fe2O3 n型半导体成功耦合。在p-n异质结界面和内置电场的作用下,复合催化剂的光生电子和空穴可以快速转移和分离。这一结果也通过光致发光光谱和光电化学实验等一系列表征得到证实。

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