Tightly Interfaced Cu2O with In2O3 to Promote Hydrogen Evolution in Presence of Biomass-Derived Alcohols

IF 2.6 4区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY ChemNanoMat Pub Date : 2024-09-27 DOI:10.1002/cnma.202400459
Salvatore Impemba, Giacomo Provinciali, Jonathan Filippi, Stefano Caporali, Beatrice Muzzi, Andrea Casini, Maria Caporali
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Abstract

By a mild and straightforward synthetic protocol in aqueous solution and without surfactants, hierarchical Cu2O nanospheres were grown on preformed In2O3 nanostructures, varying the ratio In : Cu (2.5, 0.5). Accordingly, two different binary compounds In2O3-Cu2O were prepared and afterwards they were integrated with TiO2 NPs. The ternary composites having a loading of 2.0, 5.0 and 10.0 wt.% respectively of binary In2O3-Cu2O, were tested as photocatalysts in the solar-driven production of hydrogen from water, using as sacrificial agents alcohols derived from the biomass. Satisfyingly, the rate of H2 evolution (20.5 mmol/g h) resulted two orders of magnitude higher respect to bare TiO2 (0.2 mmol/g h). Electrochemical impedance spectroscopy and photoluminescence measurements revealed the formation of a tight heterojunction between In2O3 and Cu2O, which is responsible for the improved charge carrier density and transfer and for the diminished electron-hole recombination.

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Cu2O与In2O3紧密界面促进生物质衍生醇存在下的析氢
通过在水溶液中不加表面活性剂的温和直接的合成程序,在预先成形的In2O3纳米结构上生长分层Cu2O纳米球,改变in: Cu的比例(2.5,0.5)。因此,制备了两种不同的二元化合物In2O3-Cu2O,然后将它们与TiO2 NPs集成。三元复合材料的载荷分别为2.0、5.0和10.0 wt。以生物质醇为牺牲剂,在太阳能取水制氢过程中,分别以%的二元In2O3-Cu2O作为光催化剂进行了试验。令人满意的是,H2的析出速率(20.5 mmol/g h)比裸TiO2 (0.2 mmol/g h)高了两个数量级。电化学阻抗谱和光致发光测量表明,In2O3和Cu2O之间形成了紧密的异质结,这是改善载流子密度和转移以及减少电子-空穴复合的原因。
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来源期刊
ChemNanoMat
ChemNanoMat Energy-Energy Engineering and Power Technology
CiteScore
6.10
自引率
2.60%
发文量
236
期刊介绍: ChemNanoMat is a new journal published in close cooperation with the teams of Angewandte Chemie and Advanced Materials, and is the new sister journal to Chemistry—An Asian Journal.
期刊最新文献
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