期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 41, 页码 23153-23162出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b06965
关键词
solar energy; water splitting; hydrogen production; nanoparticle; amorphous
资金
- Deutsche Forschungsgemeinschaft (DFG) [EXC 1069]
- Fonds der Chemischen Industrie (FCI)
- FCI
A facile hydrothermal synthesis protocol for the fabrication of sodium tantalates for photocatalytic water splitting is presented. Mixtures of tantalum and sodium ethoxide precursors were dispersed in ethanol, and ammonium hydroxide solution was used as mineralizer. By adjusting the amount of mineralizer, a variety of sodium tantalates with various morphologies, textural parameters, band gaps, crystal phases, and degrees of crystallinity were fabricated. The reaction was carefully monitored with a pressure sensor inside the autoclave reactor, and the obtained samples were characterized using X-ray diffraction, transmission electron microscopy, N-2-physisorption, and ultraviolet-visible light spectroscopy. Among the series, the amorphous sample and the composite sample that consists of amorphous and crystalline phases showed superior activity toward photocatalytic hydrogen production than highly crystalline samples. Particularly, an amorphous sodium tantalate -with a small fraction of crystalline nanoparticles with perovskite structure was found to be the most active sample, reaching a hydrogen rate of 3.6 mmol h(-1) from water/methanol without the use of any cocatalyst. Despite its amorphous nature, this photocatalyst gave an apparent photocatalyst activity of 1200 mu mol g(-1) L-1 h(-1) W1-, which is 4.5-fold higher than highly crystalline NaTaO3. In addition, the most active sample gave promising activity for overall water splitting with a hydrogen production rate of 94 mu mol h(-1), which is superior to highly crystalline NaTaO3 prepared by conventional solid-solid state route.
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