Novel (Na, K)TaO3 single crystal nanocubes: Molten salt synthesis, invariable energy level doping and excellent photocatalytic performance
Novel (Na, K)TaO3 single crystal nanocubes: Molten salt synthesis, invariable energy level doping and excellent photocatalytic performance
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新型(Na,K)TaO3单晶纳米立方体：熔盐合成、恒定能级掺杂和优异的光催化性能
DOI：
10.1039/c1ee01259b
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发表时间：
2011-09
期刊：
影响因子：
--
通讯作者：
Jian Pei
中科院分区：
文献类型：
--
作者：
Jingxue Sun, Gang Chen,* Yingxuan Li, Rencheng J;Jian Pei
在不使用任何表面活性剂和特殊设备的情况下，采用简单易行的熔盐法成功合成了一系列新型高效光催化剂（Na，K）TaO 3（NKT）。合成的NKT被确定为高度结晶的单晶纳米立方体，直径为100 nm。详细的时间分辨TEM动力学研究的结构的形成进行调查的纳米立方体的生长机制。发现NKT的光催化活性在没有任何助催化剂的情况下特别高。但是，由于过氧化相的形成，NKT的稳定性不令人满意。掺杂四价Zr ~（4+）和Hf ~（4+）（NKZT和NKHT）在不改变催化剂能级的情况下，有效地提高了催化剂的活性和稳定性。在NKZT和NKHT上观察到尺寸约为50 nm的均匀且接近单分散的纳米立方体。在没有助催化剂的情况下，光催化活性分别达到4.65和2.31 mmol h-1，用于产生H2和O2。这一系列特别高的活性的原因被认为是光激发电荷寿命的延长。
Without any surfactants or special equipments, a novel series of efficient photocatalysts (Na, K)TaO3 (NKT) is successfully synthesized via a simple and convenient molten-salt process. The synthesized NKT is determined to be highly crystallized single crystal nanocubes with a diameter of 100 nm. A detailed time-resolved TEM kinetic study of the formation of the structure is carried out to investigate the growth mechanism of nanocubes. Photocatalytic activity of NKT is found to be especially high without any co-catalysts. However, stability of NKT is unsatisfied due to the forming of peroxidation phases. Doping tetravalent Zr4+ and Hf4+ (NKZT and NKHT) efficiently improves both activity and stability of catalyst without changing energy level. Uniform and nearly-monodispersed nanocubes with a size of about 50 nm are observed on NKZT and NKHT. Without co-catalyst, photocatalytic activity achieves 4.65 and 2.31 mmol h−1 for H2 and O2 generation, respectively. The reason of especially high activity of this series is believed to be the prolongation of lifetime for photo-excited charges.
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