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      Fabrication of 3D hierarchical CoSnO 3@CoO pine needle-like array photoelectrode for enhanced photoelectrochemical properties

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          Abstract

          3D hierarchical CoSnO 3@CoO pine needle-like array photoelectrode for enhanced photoelectrochemical properties.

          Abstract

          A novel photoelectrode was successfully designed and constructed by depositing porous hollow CoSnO 3 nanoboxes on CoO pine needle-like arrays grown on a carbon cloth (CC) for developing Z-scheme type photocatalysts and improving photoelectrocatalytic (PEC) efficiencies. CoSnO 3 that incorporated CoO enhanced the separation efficiency of a photogenerated charger and the transport of electrons because of the p–n junction fabricated between n-CoSnO 3 and p-CoO, and heightened the light absorption in the visible region. The designed hierarchical CoSnO 3@CoO film displayed a higher photoelectrocatalytic (PEC) activity for the degradation of tetracycline (TC) and chlortetracycline (CTC). The catalytic kinetics and the possible PEC degradation mechanism of the hierarchical CoSnO 3@CoO heterojunction are discussed in detail. The work demonstrated that the hierarchical CoSnO 3@CoO pine needle-like arrays exhibited excellent properties in the PCE process due to the effectiveness of structural manipulation.

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          Efficient solar water-splitting using a nanocrystalline CoO photocatalyst.

          Longb Liao, Qiuhui Zhang, Zhihua Su … (2014)
          The generation of hydrogen from water using sunlight could potentially form the basis of a clean and renewable source of energy. Various water-splitting methods have been investigated previously, but the use of photocatalysts to split water into stoichiometric amounts of H2 and O2 (overall water splitting) without the use of external bias or sacrificial reagents is of particular interest because of its simplicity and potential low cost of operation. However, despite progress in the past decade, semiconductor water-splitting photocatalysts (such as (Ga1-xZnx)(N1-xOx)) do not exhibit good activity beyond 440 nm (refs 1,2,9) and water-splitting devices that can harvest visible light typically have a low solar-to-hydrogen efficiency of around 0.1%. Here we show that cobalt(II) oxide (CoO) nanoparticles can carry out overall water splitting with a solar-to-hydrogen efficiency of around 5%. The photocatalysts were synthesized from non-active CoO micropowders using two distinct methods (femtosecond laser ablation and mechanical ball milling), and the CoO nanoparticles that result can decompose pure water under visible-light irradiation without any co-catalysts or sacrificial reagents. Using electrochemical impedance spectroscopy, we show that the high photocatalytic activity of the nanoparticles arises from a significant shift in the position of the band edge of the material.
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            Reducing Graphene Oxide on a Visible-Light BiVO4Photocatalyst for an Enhanced Photoelectrochemical Water Splitting

            Akihide Iwase, Yun Ng, Akihiko Kudo … (2010)
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              Solar hydrogen generation by nanoscale p-n junction of p-type molybdenum disulfide/n-type nitrogen-doped reduced graphene oxide.

              Fanke Meng, Jiangtian Li, Scott K Cushing … (2013)
              Molybdenum disulfide (MoS2) is a promising candidate for solar hydrogen generation but it alone has negligible photocatalytic activity. In this work, 5-20 nm sized p-type MoS2 nanoplatelets are deposited on the n-type nitrogen-doped reduced graphene oxide (n-rGO) nanosheets to form multiple nanoscale p-n junctions in each rGO nanosheet. The p-MoS2/n-rGO heterostructure shows significant photocatalytic activity toward the hydrogen evolution reaction (HER) in the wavelength range from the ultraviolet light through the near-infrared light. The photoelectrochemical measurement shows that the p-MoS2/n-rGO junction greatly enhances the charge generation and suppresses the charge recombination, which is responsible for enhancement of solar hydrogen generation. The p-MoS2/n-rGO is an earth-abundant and environmentally benign photocatalyst for solar hydrogen generation.
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                Author and article information

                Contributors
                Journal
                Journal ID (publisher-id): JMCAET
                Title: Journal of Materials Chemistry A
                Abbreviated Title: J. Mater. Chem. A
                Publisher: Royal Society of Chemistry (RSC)
                ISSN (Print): 2050-7488
                ISSN (Electronic): 2050-7496
                Publication date Created: 2017
                Publication date (Electronic): 2017
                Volume: 5
                Issue: 35
                Pages: 18664-18673
                Affiliations
                [1 ]College of Chemistry
                [2 ]Liaoning University
                [3 ]Shenyang 110036
                [4 ]China
                Article
                DOI: 10.1039/C7TA05047J
                SO-VID: 1333eee1-908b-4bca-a74b-d572e7527cc2
                Copyright © © 2017
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