New Hydrogen-Evolution Heteronanostructured Photocatalysts: Pt-Nb3O7(OH) and Cu-Nb3O7(OH)
New Hydrogen-Evolution Heteronanostructured Photocatalysts: Pt-Nb3O7(OH) and Cu-Nb3O7(OH)
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DOI：
10.1002/cssc.201402173
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发表时间：
2014-08-01
期刊：
影响因子：
8.4
通讯作者：
Ozin, Geoffrey A.
中科院分区：
文献类型：
--
作者：
Hmadeh, Mohamad;Hoepfner, Veronika;Ozin, Geoffrey A.
采用水热法合成了七氧化三铌（Nb 3 O 7（OH））纳米棒。随后，Pt和CuO纳米粒子引入Nb 3 O 7（OH）纳米棒的表面上的微波辅助溶剂热成核和生长技术。所得到的Pt和CuO修饰的Nb 3 O 7（OH）纳米棒表现出均匀的颗粒分散，并通过X射线衍射，电子显微镜和光谱分析充分表征。此外，这些异质纳米结构的太阳能光催化制氢性能进行了研究。在波长为380 nm时，太阳能驱动的Pt-Nb_3 O_7（OH）上的H-2生成速率为710.4 +/- 1.7 μ mol g（-1）h（-1），量子效率为5.40%。有趣的是，所制备的CuO-Nb 3 O 7（OH）异质纳米结构被发现是在太阳光照射下的诱导阶段，在此期间，它经历了原位光还原过程，形成光催化活性的Cu-Nb 3 O 7（OH）。通过原位测量光吸收光谱的时间演化来监测该重构过程。重组化合物的太阳能H2产量测定为290.3 +/- 5.1 μ mol g（-1）h（-1）。
Nanorods of triniobium hydroxide heptaoxide, Nb3O7(OH), were synthesized by means of a hydrothermal method. Subsequently, Pt and CuO nanoparticles were introduced on the surface of Nb3O7(OH) nanorods by a microwave-assisted solvothermal nucleation and growth technique. The resulting Pt- and CuO-decorated Nb3O7(OH) nanorods demonstrated uniform particle dispersion and were fully characterized by X-ray diffraction, electron microscopy, and spectroscopic analysis. Furthermore, the solar-powered photocatalytic hydrogen production properties of these heteronanostructures were studied. The solar-driven H-2 formation rate over Pt-Nb3O7(OH) was determined to be 710.4 +/- 1.7 mu mol g(-1)h(-1) with a quantum efficiency of phi= 5.40% at lambda = 380 nm. Interestingly, the as-prepared CuO-Nb3O7(OH) heteronanostructure was found to be inactive under solar irradiation during an induction phase, whereupon it undergoes an in situ photoreduction process to form the photocatalytically active Cu-Nb3O7(OH). This restructuring process was monitored by an in situ measurement of the time-evolution of the optical absorption spectra. The solarpowered H2 production for the restructured compound was determined to be 290.3 +/- 5.1 mu mol g(-1)h(-1).