UV‐Light‐Driven Oxygen Pumping in a High‐Temperature Solid Oxide Photoelectrochemical Cell

Brunauer, Georg; Rotter, Bernhard; Walch, Gregor; Esmaeili, Esmaeil; Opitz, Alexander Karl; Ponweiser, Karl; Summhammer, Johann; Fleig, Jürgen

doi:10.1002/adfm.201503597

Cited by 24 publications

(28 citation statements)

References 33 publications

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“…Additional details on these experiments are given in Ref. (11), including further information on the resistive contributions of SrTiO 3 bulk and space charges. These measurement show that even at temperatures being sufficiently high to operate solid state electrochemical cells substantial photovoltages can be induced by UV light and those might act as the driving force for subsequent electrochemical energy storage.…”

Section: Resultsmentioning

confidence: 99%

Mixed Conductors under Light: On the Way to Solid Oxide Photo-Electrochemical Cells

Fleig¹,

Walch²,

Brunauer³

et al. 2016

ECS Trans.

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Photo-electrochemical cells based on aqueous electrolytes have been heavily investigated for their potential to convert light into chemical energy. In contrast, very little is known on the possibility of transferring photon energy into chemical energy in high temperature solid state electrochemical cells. This is true despite the fact that solid electrolyte based systems can be operated very successfully as fuel and electrolysis cells (SOFCs/SOECs). Here, we report results on the interaction of mixed conducting oxides with light in cells using oxide ion conductors and operating at 350-500°C. One type of system contains a high temperature solar cell based on SrTiO 3 and LaCrO 3 . It allows oxygen pumping and thus chemical energy storage under UV light. In another type of system UV light produces a time dependent voltage that includes two processes potentially also enabling energy storage: First, again a photovoltaic effect is present; second, the illuminated mixed conducting oxide changes its stoichiometry and thus leads to a battery type (Nernstian) voltage.

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Section: Resultsmentioning

confidence: 99%

Mixed Conductors under Light: On the Way to Solid Oxide Photo-Electrochemical Cells

Fleig¹,

Walch²,

Brunauer³

et al. 2016

ECS Trans.

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“…SrTiO 3 has a bandgap of about 3.3 eV at room temperature [ 16 ]. Therefore, ultraviolet light can excite valence band electrons to the conduction band and induces photoconductivity [ 17 , 18 ] or substantial photovoltages at interfaces, even above 400 °C [ 19 ]. Moreover, an enhancing effect of UV-light on the oxygen exchange kinetics was found [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Resistive states in strontium titanate thin films: Bias effects and mechanisms at high and low temperature

et al. 2017

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A study on charge transport properties of thin film Fe-doped SrTiO3 epitaxially grown on Nb-doped SrTiO3 is reported. Electric measurements between 350 °C and 750 °C show a transition from predominant ionic to electronic conduction and lower conductivity of the thin films compared to the bulk of polycrystalline samples. Defect chemical changes at elevated temperature were investigated by applying a bias voltage. A model is described which successfully predicts additional features such as inductive loops or extra semicircles measureable by impedance spectroscopy as well as the complicated time dependence of electric DC-measurements. With this model it is also possible to calculate the negligibly small ionic conductivity next to the dominating electronic conductivity in the high temperature regime. The ionic conductivity is referenced by oxygen isotope depth profiling. Changes of resistive states in Fe-doped SrTiO3 thin films at high temperature and moderate fields are compared to room temperature resistive switching phenomena at high electric fields. A conductive filament based switching process is observed at room temperature, and the capability for forming such filaments and their electric properties is further analysed using microelectrodes.

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“…12. Recently, Brunauer et al 13 demonstrated a high-temperature photoelectrochemical cell, which potentially can be used for water splitting from steam.…”

Section: Introductionmentioning

confidence: 99%

Solid-state photoelectrochemical cell with TiO2 nanotubes for water splitting

Chatzitakis

Norby

2017

Photochem Photobiol Sci

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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 TiO-based photoanode and a Pt/C-based cathode. The performance was tested with two types of photoanode electrodes, a thermally prepared TiO film on Ti foil (T-TiO) and a nanostructured TiO 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 illumination with UV-A rich light. Secondly, the deionized water was replaced by 0.5 M NaSO 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.

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UV‐Light‐Driven Oxygen Pumping in a High‐Temperature Solid Oxide Photoelectrochemical Cell

Cited by 24 publications

References 33 publications

Mixed Conductors under Light: On the Way to Solid Oxide Photo-Electrochemical Cells

Mixed Conductors under Light: On the Way to Solid Oxide Photo-Electrochemical Cells

Resistive states in strontium titanate thin films: Bias effects and mechanisms at high and low temperature

Solid-state photoelectrochemical cell with TiO2 nanotubes for water splitting

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