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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Shape-controllable synthesis of GdVO4 photocatalysts and their tunable properties in photocatalytic hydrogen generation
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Shape-controllable synthesis of GdVO4 photocatalysts and their tunable properties in photocatalytic hydrogen generation

机译：光催化氢发电中GDVO4光催化剂的形状可控合成及其可调性

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摘要

Novel visible light responsive materials for water splitting are essential for the efficient conversion of solar energy into hydrogen bond energy. Among other semiconductors, gadolinium orthovanadate has appropriate conduction and valence band edges positioned to split water molecules and a narrow band gap that allows the use of visible light for hydrogen generation. Thus, we present here that hydrogen evolution under visible light (lambda 420 nm) could be accomplished using hierarchical 3D GdVO4 particles, obtained by a simple, one pot hydrothermal synthesis. We found that applying various reaction components, such as EDTA-Na-2 and EDTA, and adjusting the pH of the solution allow one to tune the shape of GdVO4 (such as short nanowires, long nanowires, short nanorods, long nanorods, nanoparticles and spheres - all having a tetragonal crystal structure) as well as optical and photocatalytic properties. The highest ability to photocatalytically split methanol solution into hydrogen under UV-Vis irradiation was detected for the long nanowire sample (42 mu mol h(-1)), having almost 11 times higher efficiency in comparison with the weakest sample - short nanowires. In addition, GdVO4 spheres generated H-2 more than 2 times (5.75 mu mol h(-1)) in comparison with the short nanorod sample (2.5 mu mol h(-1)) under visible light excitation. Photostable in three-hour work cycles, long nanowires and spheres were even able to generate hydrogen from pure water, reaching values of 17 and 3 mu mol under UV-Vis and Vis light, respectively.
机译：用于水分裂的新型可见光响应材料对于太阳能的有效转化为氢键能量是必不可少的。在其他半导体中，钆脱钒酸盐具有适当的传导和价带边缘，其定位成分裂水分子和窄带隙，允许使用用于氢产生的可见光。因此，我们在此存在，可以使用通过简单的一个水热合成获得的分层3D GDVO4颗粒来完成可见光（Lambda＆GT; 420nm）下的氢化。我们发现应用各种反应组分，例如EDTA-Na-2和EDTA，并调节溶液的pH允许一个致电GDVO4的形状（例如短纳米线，长纳米线，短纳米棒，长纳米棒，纳米粒子和球形 - 均具有四边形晶体结构）以及光学和光催化性质。对于长纳米线样品（42μmolH（-1））检测到UV-VIS辐射下的最高能力将甲醇溶液溶液中的氢气溶液（42μmolH（-1））检测到，与最弱的样品短纳米线相比，效率高出了较高的11倍。另外，与在可见光激发下的短纳米棒样品（2.5μmolH（-1）相比，GDVO4球体产生超过2次的H-2（5.75μmolH（-1））。在三小时工作循环中光稳定，长纳米线和球体甚至能够产生纯水的氢，分别在UV-Vis和Vis光下达到17和3μm的值。

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