Article

Cu2O as a Photocatalyst for Overall Water Splitting under Visible Light Irradiation

Tokyo Institute of Technology, Edo, Tokyo, Japan
Chemical Communications (Impact Factor: 6.83). 02/1998; 3(3):357-358. 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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    • "eV, which could be used as photocatalysts under visible light [17, 27]. Cu 2 O has been first investigated as a visible lightdriven photocatalyst for water splitting since 1998 [28] . After that, many efforts have been made to improve the photocatalytic efficiency from the two aspects: (1) modulating the growth process to control the chemical stability, size, morphology, and architecture of Cu 2 O293031323334 ; (2) hindering the recombination of photogenerated electron-hole pairs [35] and photocorrosion [36, 37] . "
    [Show abstract] [Hide abstract] ABSTRACT: Ag/Cu2O microstructures with diverse morphologies have been successfully synthesized with different initial reagents of silver nitrate (AgNO3) by a facile one-step solvothermal method. Their structural and morphological characteristics were carefully investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), and the experimental results showed that the morphologies transformed from microcubes for pure Cu2O to microspheres with rough surfaces for Ag/Cu2O. The photocatalytic activities were evaluated by measuring the degradation of methyl orange (MO) aqueous solution under visible light irradiation. The photocatalytic efficiencies of MO firstly increased to a maximum and then decreased with the increased amount of AgNO3. The experimental results revealed that the photocatalytic activities were significantly influenced by the amount of AgNO3 during the preparation process. The possible reasons for the enhanced photocatalytic activities of the as-prepared Ag/Cu2O composites were discussed.
    Full-text · Article · Dec 2016 · Nanoscale Research Letters
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    • "To effectively exploit the solar spectrum, visible-light-driven semiconductors are highly sought after. Cuprous oxide (Cu 2 O) is a popular p-type semiconductor with a band gap of 2.0–2.4 eV, which can absorb most visible light, thus making good use of sunlight [9, 10]. Additionally, in contrast to other narrow-band-gap semiconductors such as metal sulfides, Cu 2 O is of low toxicity, abundant quantity, relatively cheap price, and is easily fabricated, which make it a key candidate for the decomposition of water and degradation of organic pollutants under visible light [11, 12]. "
    [Show abstract] [Hide abstract] ABSTRACT: There has been a growing interest in gathering together photocatalysis of semiconductors, like cuprous oxide (Cu2O), and the excellent electron transmittability of graphene to produce a graphene-based semiconductor for photocatalytic degradation. In this paper, a mild one-pot in situ synthesis of cubic cuprous oxide-reduced graphene oxide (Cu2O-RGO) nanocomposites has been proposed for the removal of methyl orange. In contrast to pure cubic Cu2O particles under similar preparation conditions, the cubic Cu2O-RGO nanocomposites demonstrate enhanced visible-light-driven photocatalytic activity for methyl orange dye with a 100% degradation rate in 100 min. The enhanced photocatalytic performance is mainly attributed to the increased charge transportation, effective separation of photoelectrons from vacancies, and the improved contact area.
    Full-text · Article · Jul 2016 · Nanotechnology
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    • "Cu 2 O, a wellknown p-type semiconductor (Cu vacancies originate the p-type conductivity), decorated with the current green synthesized RuO 2 nanoparticles was considered to be used as a photocatalyst under visible light range for water splitting. This RuO 2 decorated Cu 2 O configuration is considered for the following reasons: Copper (I) oxide, a p-type semiconductor with metal cation configuration of d 10 , has a band gap of the order of ~2.1 eV [49,50] and would be an ideal choice for water decomposition reaction under visible light range [51,52]. After generation of a charged pair, the formed e-hole pair will split and move to the surface of photocatalyst molecule. "
    [Show abstract] [Hide abstract] ABSTRACT: This contribution reports on the biosynthesis of quasi-monodisperse rutile Ruthenium (IV) oxide nanoparticles with an average diameter of 2.15 nm using Aspalathus linearis natural extract as a chelating agent as well as a capping compound. Their morphological, structural and optical properties were investigated using various complementary surface/interface characterization techniques. This includes transmission electron microscopy, selective area electron diffraction. Their optical band gap was found to be about 2.1 eV. Loaded onto a p-type Cu2O thin film, the nano-scaled RuO2-Cu2O tandem exhibits an effective water photo-splitting response in the solar spectrum.
    Full-text · Article · Mar 2016 · Journal of Alloys and Compounds
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