Layered Dion-Jacobson type niobium oxides for photocatalytic hydrogen production prepared via molten salt synthesis
Layered Dion-Jacobson type niobium oxides for photocatalytic hydrogen production prepared via molten salt synthesis
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DOI：
10.1016/j.cattod.2016.10.009
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发表时间：
2017-06
期刊：
影响因子：
5.3
通讯作者：
Natalia Kulischow;C. Ladasiu;R. Marschall
中科院分区：
文献类型：
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作者：
Natalia Kulischow;C. Ladasiu;R. Marschall
首次采用熔盐法制备了一类Dion-Jacobson型层状钙钛矿型铌氧化物（AB 2 Nb 3 O 10，A = K、Rb、Cs，B = Ca、Sr、Ba）。通过将氧化物和碳酸盐前体溶解在A-阳离子氯化物熔体中，这种类型的合成仅需要两个小时的制备时间，与常规合成（如固态反应）相比，在短得多的合成时间内产生高度结晶的层状碳酸盐。除了详细的材料表征外，我们还研究了A-阳离子和B-阳离子变化对带隙和光催化制氢活性的影响。结果发现，带隙随着B-阳离子尺寸的增加而减小。从稳态析氢速率可以推导出对层间距（受A-阳离子的大小影响）和晶格弛豫的强烈依赖性。
A class of Dion-Jacobson type layered perovskite niobium oxides (AB2Nb3O10with A = K, Rb, Cs and B = Ca, Sr, Ba) was preparedviamolten salt method for the first time. By dissolving oxide and carbonate precursors in A-cation chloride melts, this type of synthesis needs only two hours of preparation time resulting in highly crystalline layered niobates at a much shorter synthesis time compared to conventional syntheses, like the solid state reaction. Beside detailed materials characterization, we investigated the influence of A-cation and B-cation variation on the band gap and photocatalytic activity for hydrogen production. It was found that the band gap decreases with the increase in size of the B-cation. A strong dependence on interlayer spacing (influenced by the size of the A-cation) and lattice relaxation can be derived from the steady-state hydrogen evolution rates.