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Electronically Integrated Mesoporous Ag–TiO2 Nanocomposite Thin films for Efficient Solar Hydrogen Production in Direct Sunlight
Energy Technology ( IF 3.6 ) Pub Date : 2021-08-12 , DOI: 10.1002/ente.202100356
Sunesh S Mani 1 , Sivaraj Rajendran 1 , Naresh Nalajala 2 , Thomas Mathew 1 , Chinnakonda S Gopinath 2
Affiliation  

The synthesis of mesoporous TiO2 by a solution-based assembly process and Ag/TiO2 nanocomposites is provided. The efficacy of Ag/TiO2 nanocomposite as photocatalyst in thin-film form is demonstrated for solar hydrogen generation in sunlight. Integration of Ag with TiO2 dramatically enhanced the H2 production: with 1 wt% Ag on TiO2 (TiAg-1), the H2 yield was observed to be 4.59 mmol h−1 g−1, which is 2.3 (30) times larger than 0.5 wt% Ag on TiO2. TiAg-1 shows 4.3 times higher activity in film form compared with its powder counterpart. High photocatalytic efficiency is attributed to the surface plasmon resonance effect of Ag, electronic integration of Ag with TiO2, and subsequent valence band broadening, large distribution of Ag nanoparticles and abundant Ag-TiO2 Schottky junctions, and the later minimizes electron–hole recombination. Interparticle mesoporous network increases necking and the high surface area offers easy accessibility of the reactants to a large number of active sites.

中文翻译:

用于在阳光直射下高效太阳能制氢的电子集成介孔 Ag-TiO2 纳米复合薄膜

提供了通过基于溶液的组装工艺合成介孔 TiO 2和 Ag/TiO 2纳米复合材料。Ag/TiO 2纳米复合材料作为薄膜形式的光催化剂的功效已被证明用于在阳光下产生太阳能。Ag 与 TiO 2 的整合显着提高了 H 2 的产生:在 TiO 2 (TiAg-1)上含有 1 wt% Ag 的情况下,观察到的 H 2产率为 4.59 mmol h -1  g -1,即 2.3 (30)比 TiO 2上的 0.5 wt% Ag 大几倍. 与粉末对应物相比,TiAg-1 薄膜形式的活性高 4.3 倍。高光催化效率归因于 Ag 的表面等离子体共振效应、Ag 与 TiO 2 的电子整合以及随后的价带加宽、Ag 纳米颗粒的大分布和丰富的 Ag-TiO 2肖特基结,后者最大限度地减少了电子 - 空穴复合. 颗粒间介孔网络增加了颈缩,高表面积使反应物易于接近大量活性位点。
更新日期:2021-08-12
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