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Cu2O as a photocatalyst for overall water splitting under visible light irradiation

Chemical Communications (Impact Factor: 6.72). 01/1998; DOI: 10.1039/a707440i

ABSTRACT Photocatalytic decomposition of water into H2 and O2 on Cu2O under visible light irradiation is investigated; the photocatalytic water splitting on Cu2O powder proceeds without any noticeable decrease in the activity for more than 1900 h.

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    • "Copper is a material of choice in many applications because of its high thermal and electrical conductivities, in addition to its nontoxicity , natural abundance and relatively inexpensive cost. Its oxides are amongst the first known p-type direct band gap semiconductor materials, although n-type conductivity was also reported [1], and have found numerous applications in the fabrication of photovoltaic devices [2], electrochromics [3], catalytic and photocatalytic reactions [4] [5] [6] [7], magnetic storage and gas sensing materials [8]. The yellowish cuprous oxide (Cu 2 O) is highly transparent and usually absorbs at wavelengths shorter than 600 nm, whilst the brownish black cupric oxide (CuO) absorbs strongly throughout the whole visible spectral range. "
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    ABSTRACT: In this paper, we report on the time-dependent development of cupric oxide films by chemical modifica-tion of copper substrates submerged horizontally in a room temperature 75 mmol/L ammonia solution at pH 11, over a period of nine days. Morphological and structural characterization of the oxide-substrate tandems were carried out by SEM–EDX and XRD, while the relative directional spectral absorptivity and reflectivity were determined by Vis–NIR spectrometry. The ageing process, controlling both the color and morphological structure of the predominately amorphous-CuO/Cu, has positively contributed to the enhancement of spectral absorptivity, while band gap values evolve from 1.29 to 1.39 eV for exposure times from 36 to 168 h. Ó 2014 Elsevier B.V. All rights reserved.
    Journal of Alloys and Compounds 12/2014; 617(C):542-546. DOI:10.1016/j.jallcom.2014.07.221 · 2.73 Impact Factor
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    • "Copper oxides are important p-type semiconductor materials; they have two common forms such as cuprous oxide or cuprite (Cu 2 O) and cupric oxide or tenorite (CuO) [1], with band gaps of about 2.17 eV [2] [3], and 1.85 eV [4], respectively. Cuprous oxide (Cu 2 O) is a typical p-type semiconductor with various applications such as solar energy conversion [5], catalysis of organic reactions [6], copper oxide oxidation [7], lithium ion batteries [8], gas sensors [9], biosensors, magnetic storage devices [10] [11] [12], and as a photocatalyst for the degradation of organic pollutants and splitting water into O 2 and H 2 under visible light [13] [14]. The cited applications require the synthesis of high purity single phase Cu 2 O nanocrystals. "
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    ABSTRACT: An easy synthesis route for cuprous oxide (Cu2O) nanoparticles is reported via thermal annealing improved and controlled by in-situ conductivity measurements. The crystalline structure, phase transition, surface morphology and particle size/shape, were investigated through X-ray diffraction, a conductivity setup and scanning electron microscopy, respectively. X-ray diffraction patterns revealed that initial metallic Cu nanoparticles were transformed to Cu2O nanoparticles with high purity, under specific conditions critically dependent on the temperature and annealing duration. This transformation was also dependent on the film thickness and atmospheric composition in the test chamber during the annealing process.
    Ceramics International 07/2014; 40(6). DOI:10.1016/j.ceramint.2013.12.130 · 2.09 Impact Factor
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    • "not mimicking Z-Scheme). We are here modifying Copper (I) Oxide, a well-known p-type semiconductor [7][8], with Ruthenium (IV) oxide nanoparticles to use as a photocatalyst under visible light range, for overall water splitting. "
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    ABSTRACT: Overall decomposition of water into hydrogen and oxygen in presence of a heterogeneous photocatalyst has received prodigious attention due to its potential for the production of clean and recyclable hydrogen energy. However, most of the efficient photocatalysts developed till date, works primarily on ultra-violate range of light. To develop photocatalysts that can decompose water under more abundant visible range of light, efforts have already been made by researchers who basically tried to synthesize materials which have such a narrow band gap that they can utilize less energetic photons in visible range. To do so, the catalysts that they have prepared to exhibit high stability and to give decent reaction rate and quantum efficiency are of extremely complex structure. Moreover, cumbersome synthesis route involving doping of different materials, complicated core-shell nanostructure preparation, etc is necessary in most of the cases. Here, we report a facile and efficient approach to facilitate photocatalytic water-splitting under visible light, in single step. We have modified Cu2O, a well-known p-type semiconductor having a band-gap ∼2.1 eV, with RuO2 nanoparticles and used it as photocatalyst. We have observed that it has a possibility of near-stoichiometric overall water decomposition under visible light with appreciable quantum efficiency.
    Energy Procedia 01/2014; 54:221–227. DOI:10.1016/j.egypro.2014.07.265
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