Solar-driven Z-scheme water splitting using tantalum/nitrogen co-doped rutile titania nanorod as an oxygen evolution photocatalyst
Solar-driven Z-scheme water splitting using tantalum/nitrogen co-doped rutile titania nanorod as an oxygen evolution photocatalyst
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DOI：
10.1039/c6ta10541f
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发表时间：
2017-06-21
影响因子：
11.9
通讯作者：
Maeda, Kazuhiko
中科院分区：
文献类型：
--
作者：
Nakada, Akinobu;Nishioka, Shunta;Maeda, Kazuhiko
采用Ta和N掺杂的金红石型TiO 2纳米棒（TiO 2：Ta/N）作为光催化剂，构建了一个可见光驱动的两步光激发（Z-方案）水分解体系. Ta掺杂的二氧化钛纳米棒，通过溶剂热合成，进行氮化，具有可见光吸收在温和的条件下，即使在623 K下的氨流。TiO2：Ta/N粉末改性RuO 2助催化剂在可见光下的活性高达540 nm的水氧化产生O-2在可逆电子受体（IO 3-或Fe 3+）的存在下，而TiO 2：N表现出可忽略不计的活性。时间分辨红外吸收光谱结果表明，Ta和N共掺杂提高了TiO 2光生自由电子的寿命，从而提高了TiO 2的光催化活性。在可见光照射（λ> 420 nm）和AM 1.5G模拟太阳光下，使用RuO 2改性的TiO 2：Ta/N、Ru负载的SrTiO 3：Rh和Fe 3 +/Fe 2+氧化还原对的组合实现了通过水裂解同时释放H-2和O-2。
A visible-light-driven water-splitting system that involves two-step photoexcitation (Z-scheme) was constructed using rutile TiO2 nanorod doped with Ta and N (TiO2:Ta/N) as an O-2 evolution photocatalyst. The Ta-doped TiO2 nanorods, prepared by a solvothermal synthesis, underwent nitridation to possess visible-light absorption under mild conditions, even at 623 K under an ammonia flow. The TiO2: Ta/N powders modified with a RuO2 cocatalyst were active under visible light up to 540 nm for water oxidation for producing O-2 in the presence of reversible electron acceptors (IO3- or Fe3+), while TiO2: N exhibited negligible activity. The results of time-resolved infrared absorption spectroscopy indicated that co-doping Ta with N into TiO2 prolonged the lifetime of photogenerated free electrons, leading to high photocatalytic activity. Simultaneous H-2 and O-2 evolution via water splitting was achieved using a combination of RuO2-modified TiO2: Ta/N, Ru-loaded SrTiO3:Rh and an Fe3+/Fe2+ redox couple under visible-light irradiation (lambda > 420 nm) and under AM 1.5G simulated sunlight.