Nb2O5 based photocatalysts for efficient generation of H2 by Photoreforming of aqueous solutions of ethanol

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED Catalysis Today Pub Date : 2024-11-29 DOI:10.1016/j.cattod.2024.115147

Alberta Genco , Elisa I. García-López , Bartolomeo Megna , Conchi Ania , Giuseppe Marcì

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Abstract

A series of Nb₂O₅ semiconductors and their composites with TiO₂ have been prepared following a hydrothermal treatment at varied synthetic conditions, and tested for the photoreforming of aqueous solutions of ethanol. The photo-reforming activity has been tested under UV and natural solar light irradiation, both in the absence and in the presence of Pt as co-catalyst. Our data has shown that the Nb₂O₅-TiO₂ composite prepared by a hydrothermal treatment of three days displayed the highest photocatalytic activity, with a hydrogen production of 138 mmol_H2h⁻¹g⁻¹ under UV light (apparent quantum yield of ca. 44 %) and 40 mmol_H2kJ⁻¹g⁻¹ under natural solar light (apparent quantum yield of ca. 85 % considering only the UV fraction of sunlight). The exalted photocatalytic activity of this material was attributed to the concomitance of two favorable events, namely the possible formation of a heterojunction between the two semiconductors and the optimal ratio of them in this composite.

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在不同的合成条件下，通过水热处理制备了一系列 Nb2O5 半导体及其与 TiO2 的复合材料，并对其进行了乙醇水溶液光转化测试。在没有铂作为辅助催化剂和有铂作为辅助催化剂的情况下，测试了在紫外线和自然太阳光照射下的光转化活性。我们的数据显示，经过三天水热处理制备的 Nb2O5-TiO2 复合材料显示出最高的光催化活性，在紫外光下的产氢量为 138 mmolH2h-1g-1（表观量子产率约为 44%），在天然太阳光下的产氢量为 40 mmolH2kJ-1g-1（仅考虑太阳光中的紫外线部分，表观量子产率约为 85%）。这种材料的光催化活性之所以如此高，是因为同时发生了两个有利的事件，即两种半导体之间可能形成异质结，以及这种复合材料中两种半导体的最佳比例。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.