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Highly efficient visible-light driven photocatalytic hydrogen production from a novel Z-scheme Er3+:YAlO3/Ta2O5-V5+||Fe3+-TiO2/Au coated composite
Journal of Power Sources ( IF 8.1 ) Pub Date : 2017-11-09 , DOI: 10.1016/j.jpowsour.2017.11.005
Guowei Wang , Xue Ma , Shengnan Wei , Siyi Li , Jing Qiao , Jun Wang , Youtao Song

In this work, the preparation of a novel Z-scheme photocatalyst, Er3+:YAlO3/Ta2O5-V5+||Fe3+-TiO2/Au coated composite, for visible-light photocatalytic hydrogen production is reported for the first time. In this photocatalyst, Au nanoparticles as conduction band co-catalyst provide more active sites to enrich electrons. Ta2O5-V5+||Fe3+-TiO2 as composite redox cycle system thoroughly separates the photo-generated electrons and holes. In addition, Er3+:YAlO3 as up-conversion luminescence agent (from visible-light to ultraviolet-light) provides enough ultraviolet-light for satisfying the energy demand of wide band-gap semiconductors (TiO2 and Ta2O5). The photocatalytic hydrogen production can be achieved from methanol as sacrificial agent (electron donor) under visible-light irradiation. The main influence factors such as initial solution pH and molar ratio of TiO2 and Ta2O5 on visible-light photocatalytic hydrogen production activity of Er3+:YAlO3/Ta2O5-V5+||Fe3+-TiO2/Au coated composite are discussed in detail. The results show that the Er3+:YAlO3/Ta2O5-V5+||Fe3+-TiO2/Au coated composite with 1.0:0.5 M ratio of TiO2 and Ta2O5 in methanol aqueous solution at pH = 6.50 displays the highest photocatalytic hydrogen production activity. Furthermore, a high level of photocatalytic activity can be still maintained within three cycles under the same conditions. It implies that the prepared Z-scheme Er3+:YAlO3/Ta2O5-V5+||Fe3+-TiO2/Au coated composite may be a promising photocatalyst utilizing solar energy for hydrogen production.



中文翻译:

新型Z方案Er 3+:YAlO 3 / Ta 2 O 5 -V 5+ || Fe 3+ -TiO 2 / Au涂覆的复合物可高效地产生可见光,从而可催化光催化制氢

在这项工作中,一种新型的Z型光催化剂Er 3+:YAlO 3 / Ta 2 O 5 -V 5+ || Fe 3+ -TiO 2 / Au涂覆的复合材料的制备是用于可见光光催化制氢的。第一次报告。在这种光催化剂中,作为导带助催化剂的金纳米粒子提供了更多的活性位点来富集电子。作为复合氧化还原循环系统的Ta 2 O 5 -V 5+ || Fe 3+ -TiO 2可以彻底分离光生电子和空穴。另外,Er 3+:YAlO 3作为上转换发光剂(从可见光到紫外光),它提供了足够的紫外光以满足宽带隙半导体(TiO 2和Ta 2 O 5)的能量需求。在可见光照射下,可以由甲醇作为牺牲剂(电子供体)实现光催化制氢。初始溶液的pH值,TiO 2和Ta 2 O 5的摩尔比等主要因素对Er 3+:YAlO 3 / Ta 2 O 5 -V 5+ || Fe 3+ -的可见光催化产氢活性的影响二氧化钛2详细讨论了/ Au涂层复合材料。结果表明,在甲醇水溶液中TiO 2和Ta 2 O 5的比为1.0:0.5 M的Er 3+:YAlO 3 / Ta 2 O 5 -V 5+ || Fe 3+ -TiO 2 / Au复合涂层在pH = 6.50时显示出最高的光催化制氢活性。此外,在相同条件下的三个循环内仍可以保持高水平的光催化活性。这意味着制备的Z方案Er 3+:YAlO 3 / Ta 2 O 5 -V 5+ || Fe3+ -TiO 2 / Au涂层复合材料可能是一种有前途的利用太阳能生产氢的光催化剂。

更新日期:2017-11-09
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