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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Increased photocurrent of CuWO4 photoanodes by modification with the oxide carbodiimide Sn2O(NCN)
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Increased photocurrent of CuWO4 photoanodes by modification with the oxide carbodiimide Sn2O(NCN)

机译:通过用氧化碳碳二亚胺Sn2O(NCN)改性来增加CuWO4光阳极的光电流

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摘要

Tin(ii) oxide carbodiimide is a novel prospective semiconductor material with a band gap of 2.1 eV and lies chemically between metal oxides and metal carbodiimides. We report on the photochemical properties of this oxide carbodiimide and apply the material to form a heterojunction with CuWO4 thin films for photoelectrochemical (PEC) water oxidation. Mott-Schottky experiments reveal that the title compound is an n-type semiconductor with a flat-band potential of -0.03 V and, as such, the position of the valence band edge would be suitable for photochemical water oxidation. Sn2O(NCN) increases the photocurrent of CuWO4 thin films from 32 mu A cm(-2) to 59 mu A cm(-2) at 1.23 V vs. reversible hydrogen electrode (RHE) in 0.1 M phosphate buffer (pH 7.0) under backlight AM 1.5G illumination. This upsurge in photocurrent originates in a synergistic effect between the oxide and oxide carbodiimide, because the heterojunction photoanode displays a higher current density than the sum of its individual components. Structural analysis by powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) reveals that Sn2O(NCN) forms a core-shell structure Sn2O(NCN)@SnPOx during the PEC water oxidation in phosphate buffer. The electrochemical activation is similar to the behavior of Mn(NCN) but different from Co(NCN).
机译:锡(II)氧化铝碳二酰胺是一种新型前瞻性半导体材料,具有2.1eV的带隙,在金属氧化物和金属碳二亚胺之间化学呈现。我们报告了该氧化碳碳二亚胺的光化学特性,并施加材料以形成具有用于光电化学(PEC)水氧化的Cuwo4薄膜的异质结。 Mott-肖特基实验表明,标题化合物是具有-0.03V的平带电位的n型半导体,因此,价带边缘的位置适用于光化学水氧化。 SN2O(NCN)在0.1M磷酸盐缓冲液(pH7.0)中,将CuWO4薄膜从32μm(-2)至59μm(-2)的Cuwo4薄膜从32μm(-2)到59μm)增加到59μm(-2)背光am 1.5g照明。这种在光电流中的上升源于氧化物和氧化碳二亚胺之间的协同效果,因为异质结阳极显示器比其各个组件的总和显示更高的电流密度。通过粉末X射线衍射(XRD)和X射线光电子能谱(XPS)的结构分析揭示了Sn2O(NCN)在磷酸盐缓冲液的水PEC氧化过程中形成核 - 壳结构Sn2O(NCN)@SnPOx。电化学激活类似于Mn(NCN)的行为,但不同于CO(NCN)。

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