Overall water splitting by Ta3N5 nanorod single crystals grown on the edges of KTaO3 particles
Overall water splitting by Ta3N5 nanorod single crystals grown on the edges of KTaO3 particles
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DOI：
10.1038/s41929-018-0134-1
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发表时间：
2018-10-01
期刊：
影响因子：
37.8
通讯作者：
Domen, Kazunari
中科院分区：
文献类型：
--
作者：
Wang, Zheng;Inoue, Yasunobu;Domen, Kazunari
尽管颗粒光催化剂上的一步激发全水分解是一种进行可扩展的太阳能到氢能转换的简单方法，但缺乏在可见光下具有显着活性的光催化剂。尽管 Ta3N5 光催化剂具有优异的可见光吸收能力，但由于缺陷处的强烈电荷复合，尚未实现整体水分解。在这里，我们展示了通过短暂氮化过程中钾物质的挥发，Ta3N5 纳米棒在晶格匹配的立方 KTaO3 颗粒上快速生长。在 KTaO3 边缘选择性生成的 Ta3N5 纳米棒是空间分离的、边界清晰的单晶，没有晶界。当与 Rh/Cr2O3 助催化剂结合时，单晶 Ta3N5 纳米棒在可见光和模拟阳光下非常有效地将水分解为氢气和氧气。我们的研究结果证明了无结构缺陷的纳米结构单晶光催化剂在太阳能水分解中的重要性。
Although one-step-excitation overall water splitting on a particulate photocatalyst is a simple means of performing scalable solar-to-hydrogen energy conversion, there is a lack of photocatalysts with significant activity under visible light. Despite its superior visible-light absorption, the Ta3N5 photocatalyst has not accomplished overall water splitting due to strong charge recombination at defects. Here, we show rapid growth of Ta3N5 nanorods on lattice-matched cubic KTaO3 particles through the volatilization of potassium species during a brief nitridation process. The Ta3N5 nanorods generated selectively on the edge of KTaO3 are spatially separated and well-defined single crystals free from grain boundaries. When combined with the Rh/Cr2O3 co-catalyst, the single-crystal Ta3N5 nanorods split water into hydrogen and oxygen very efficiently under visible light and simulated sunlight. Our findings demonstrate the importance of nanostructured single-crystal photocatalysts free from structural defects in solar water splitting.