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Issue 1, 2017
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Solid-state photoelectrochemical cell with TiO2 nanotubes for water splitting

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Abstract

We have fabricated and tested a photoelectrochemical (PEC) cell where the aqueous electrolyte has been replaced by a proton conducting hydrated Nafion® polymer membrane. The membrane was sandwiched between a TiO2-based photoanode and a Pt/C-based cathode. The performance was tested with two types of photoanode electrodes, a thermally prepared TiO2 film on Ti foil (T-TiO2) and a nanostructured TiO2 films in the form of highly ordered nanotubes (TNT) of different lengths. Firstly, photovoltammetry experiments were conducted under asymmetric conditions, where the anode was immersed in deionized water, while the cathode was kept in ambient air. The results showed a high incident photon-to-current efficiency (IPCE) of 19% under unassisted conditions (short-circuit, 0 V vs. cathode) with short TNT (ca. 1 μm) under 4 mW cm−2 illumination with UV-A rich light. Secondly, the deionized water was replaced by 0.5 M Na2SO4 and now the performance was higher with longer nanotubes, assigned to increased ionic conductivity inside the tubes. An unassisted (0 V) IPCE of 33% was achieved with nanotubes of ca. 8 μm. The presented solid-state PEC cell minimizes the electrode distance and volume of the device, and provides a way towards compact practical applications in solar water splitting.

Graphical abstract: Solid-state photoelectrochemical cell with TiO2 nanotubes for water splitting

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Publication details

The article was received on 20 Jun 2016, accepted on 26 Aug 2016 and first published on 06 Sep 2016


Article type: Paper
DOI: 10.1039/C6PP00217J
Citation: Photochem. Photobiol. Sci., 2017,16, 10-16
  • Open access: Creative Commons BY license
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    Solid-state photoelectrochemical cell with TiO2 nanotubes for water splitting

    K. Xu, A. Chatzitakis and T. Norby, Photochem. Photobiol. Sci., 2017, 16, 10
    DOI: 10.1039/C6PP00217J

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