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Photocatalytic water splitting on Au/HTiNbO_5 nanosheets

机译:Au / HTiNbO_5纳米片上的光催化水分解

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The layered potassium titanium niobate, KTiNbO_5, is known as a photocatalyst for hydrogen production from water splitting under UV light. Here we show that titanium niobate nanosheets with a slit like framework can be obtained by exfoliation of KTiNbO_5 followed by proton exchange. Gold nanoparticles were deposited on the titanium niobate nanosheets using deposition-precipitation (DP), photo-deposition (PD) and impregnation (IMP) method in order to improve photocatalytic hydrogen production from water splitting. These catalysts were characterized by powder X-ray diffraction patterns (XRD), inductively coupled plasma mass spectrometry (ICP-MS), UV-visible spectroscopy (UV-vis), and Transmission Electron Microscopy (TEM). The gold loaded titanium niobate nanosheets prepared by the DP method consisted of a good metal-semiconductor interface which allowed for a much higher efficient electron-hole separation. In this paper, we developed a facile method of preparing titanium niobate nanosheets containing gold nanoparticles. The titanium niobate nanosheets with Au cocatalyst prepared by the DP method showed a uniform dispersion of gold nanoparticles with an average gold particle size of 3 nm and exhibited an ultra-high photocatalytic water splitting activity, which was 56 times higher than that exhibited by the origin KTiNbO_5 photocatalyst.
机译:层状铌酸钾钛盐KTiNbO_5被称为光催化剂,用于在紫外光下将水分解产生氢气。在这里,我们显示可以通过剥落KTiNbO_5然后进行质子交换来获得具有狭缝状骨架的铌酸钛纳米片。使用沉积沉淀(DP),光沉积(PD)和浸渍(IMP)方法将金纳米颗粒沉积在铌酸钛纳米片上,以改善水分解产生的光催化制氢。这些催化剂的特征在于粉末X射线衍射图(XRD),电感耦合等离子体质谱(ICP-MS),紫外可见光谱(UV-vis)和透射电子显微镜(TEM)。通过DP法制备的负载金的铌酸钛纳米片由良好的金属-半导体界面组成,其允许更高效率的电子-空穴分离。在本文中,我们开发了一种制备含金纳米粒子的铌酸钛纳米片的简便方法。用DP法制得的含Au助催化剂的铌酸钛纳米片表现出金纳米颗粒的均匀分散,平均金粒径为3 nm,并具有超高的光催化水分解活性,比原产地高56倍。 KTiNbO_5光催化剂。

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