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Issue 10, 2015
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Carbon nitride–TiO2 hybrid modified with hydrogenase for visible light driven hydrogen production

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Abstract

A system consisting of a [NiFeSe]–hydrogenase (H2ase) grafted on the surface of a TiO2 nanoparticle modified with polyheptazine carbon nitride polymer, melon (CNx) is reported. This semi-biological assembly shows a turnover number (TON) of more than 5.8 × 105 mol H2 (mol H2ase)−1 after 72 h in a sacrificial electron donor solution at pH 6 during solar AM 1.5 G irradiation. An external quantum efficiency up to 4.8% for photon-to-hydrogen conversion was achieved under irradiation with monochromatic light. The CNx–TiO2–H2ase construct was also active under UV-free solar light irradiation (λ > 420 nm), where it showed a substantially higher activity than TiO2–H2ase and CNx–H2ase due, in part, to the formation of a CNx–TiO2 charge transfer complex and highly productive electron transfer to the H2ase. The CNx–TiO2–H2ase system sets a new benchmark for photocatalytic H2 production with a H2ase immobilised on a noble- and toxic-metal free light absorber in terms of visible light utilisation and stability.

Graphical abstract: Carbon nitride–TiO2 hybrid modified with hydrogenase for visible light driven hydrogen production

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Publication details

The article was received on 05 Jun 2015, accepted on 29 Jun 2015 and first published on 29 Jun 2015


Article type: Edge Article
DOI: 10.1039/C5SC02017D
Citation: Chem. Sci., 2015,6, 5690-5694
  • Open access: Creative Commons BY license
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    Carbon nitride–TiO2 hybrid modified with hydrogenase for visible light driven hydrogen production

    C. A. Caputo, L. Wang, R. Beranek and E. Reisner, Chem. Sci., 2015, 6, 5690
    DOI: 10.1039/C5SC02017D

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