TiO2–SrTiO3 composite photoanode: effect of strontium precursor concentration on the performance of dye-sensitized solar cells

Rahman, Mohd Yusri Abd; Samsuri, S. A. M.; Umar, Akrajas Ali

doi:10.1007/s00339-018-2344-4

Cited by 21 publications

(20 citation statements)

References 41 publications

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“…Figure displays the intermolecular vibrational modes of the as-prepared samples, including E g , B 1g , and A 2g . Among these modes, E g at ∼145.0 cm –1 (inset spectrum) is a symmetric peak that is contributed from the O–Ti–O vibration. ,,− With the STO formation and hydrogenation, the position of the E g mode was respectively blue-shifted to 146.7 and 147.1 cm –1 for the STO/TiO 2 and H:(STO/TiO 2 ) substrates, possibly related to an increased surface tension . In this work, the Au vibration mode was not detected because of the small extent of its loading.…”

Section: Resultsmentioning

confidence: 65%

“…As shown in Figure b, the photocurrent generated from materials respectively increased and decreased with and without illumination, forming several repeated pulse curves with slight photocurrent loss (<5%) and little time retard, especially Au/H:(STO/TiO 2 ). The small photocurrent loss and little time retard of Au/H:(STO/TiO 2 ) reveal that the charge recombination inside is suppressed and the entire photoactivity is enhanced. , In addition, the plasmonic effect of Au is verified with the incident photon conversion efficiency (IPCE) measurement, as displayed in Figure S4. The Au-photosensitized H:(STO/TiO 2 ) displays an enhanced photoactivity in the region from 475 to 700 nm of visible light compared to H:(STO/TiO 2 ), implying the LSPR effect is induced by Au NPs. ,, Experimentally obtained and theoretically calculated gas volumes of H 2 and O 2 produced , during solar water splitting reaction of the Au/H:(STO/TiO 2 ) were carried out, as shown in Figure S6.…”

Section: Resultsmentioning

confidence: 76%

“…The small photocurrent loss and little time retard of Au/H:(STO/TiO 2 ) reveal that the charge recombination inside is suppressed and the entire photoactivity is enhanced. 30,34 In addition, the plasmonic effect of Au is verified with the incident photon conversion efficiency (IPCE) measurement, as displayed in Figure S4. The Au-photosensitized H:(STO/TiO 2 ) displays an enhanced photoactivity in the region from 475 to 700 nm of visible light compared to H:(STO/TiO 2 ), implying the LSPR effect is induced by Au NPs.…”

Section: Methodsmentioning

confidence: 69%

“…32,33,55−57 With the STO formation and hydrogenation, the position of the E g mode was respectively blue-shifted to 146.7 and 147.1 cm −1 for the STO/TiO 2 and H:(STO/TiO 2 ) substrates, possibly related to an increased surface tension. 34 In this work, the Au vibration mode was not detected because of the small extent of its loading. Among these spectra, a significant peak broadening and red shift toward 142.5 cm −1 existed for the Au/H:(STO/TiO 2 ) substrate.…”

Section: Methodsmentioning

confidence: 75%

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Synergistic Effects of Plasmonic Gold and Perovskite-Type SrTiO₃ for Enhanced Photocatalytic Performance of TiO₂ Nanotube Arrays

et al. 2021

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Hydrogenated SrTiO 3 /TiO 2 (H:(STO/TiO 2 )) with unique heterostructured arrays was prepared, followed by the immobilization of plasmonic Au nanoparticles to form robust composite photoelectrodes. The synergistic effects of heterocoupling of perovskite-type STO on TiO 2 nanotube arrays and plasmonic Au-decoration substantially improved the photocatalytic performance with visible light. In contrast to pure TiO 2 , H:(STO/ TiO 2 ) facilitated an efficient transfer of electrons between STO and TiO 2 , and decreased the recombination ratios of photoexcited electron−hole pairs. Plasmonic Au also effectively boosted the photoresponse under irradiation with visible light. Photocurrent density of 2.3 mA cm −2 under visible light irradiation (λ > 400 nm) with IPCE peaking at 17% and a concomitant apparent quantum efficiency of 3.5% in the 580−680 nm region was achieved. Faradaic efficiency was estimated to be about 80% at the oxygen evolution rate of 18.5 μmol cm −2 h −1 under simulated sunlight irradiation (AM1.5G, 100 mW cm −2 ). With the aid of X-ray absorption spectra in situ and ultrafast transient absorption spectra, the detailed understanding of the underlying mechanism during photoinduced processes in Au/H:(STO/TiO 2 ) is well elucidated.

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Section: Resultsmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 76%

Section: Methodsmentioning

confidence: 69%

Section: Methodsmentioning

confidence: 75%

See 2 more Smart Citations

Synergistic Effects of Plasmonic Gold and Perovskite-Type SrTiO₃ for Enhanced Photocatalytic Performance of TiO₂ Nanotube Arrays

et al. 2021

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“…This leads to increase in electron life time value of 0.30 ms for the champion cell. [121] Eguchi et al fabricated photoanodes based on Nb 2 O 5 mixed with oxides having flat-band potential of ZrO 2 , Ta 2 O 5 , and SrTiO 3 in the ratio of (8:2). The obtained V OC of ZrO 2 , Ta 2 O 5, and SrTiO 3 mixtures of Nb 2 O 5 was found to be 0.76, 0.73, and 0.71 V, respectively, which was consistent with their corresponding flat-band potential values.…”

Section: Cadmium Stannate-based Dsscsmentioning

confidence: 99%

Account of Structural, Theoretical, and Photovoltaic Properties of ABO₃ Oxide Perovskites Photoanode‐Based Dye‐Sensitized Solar Cells

et al. 2021

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The quality of human life in the modern era seems to be highly reliable on the technology advancements and energy consumption. [1] Globally, around 85% of the energy depends on nonrenewable sources which may extinct within next few years. [2] In this context, solar cells in specifically dye-sensitized solar cells (DSSCs), which come under thin-filmbased third-generation solar cells, are considered to play a vital role of fulfilling the future energy needs by means of its proficient energy conversion potential, in addition to its lightweight, low-cost, reliable efficiency, multicolor options, and feasible for both indoor and outdoor applications. It is one of the most promising energy conversion devices from its technological discovery of early 1990s by Brain O'Regan and Michael Gratzel [3,4] In general, the working of DSSC depends on five major components, namely, 1) substrate, 2) semiconductor nanolayer, 3) the sensitizer, 3) redox electrolyte, and 5) counter electrode. The schematic representation of a typical DSSC with components is shown in Figure 1.Initially, the photosensitizer (dye) of the DSSC usually in its ground state and the illumination of light over the DSSC excite the ground state dye molecules from highest occupied molecular orbital (HOMO) level to the lowest unoccupied molecular orbital (LUMO) level (1), and then the electron from the LUMO level jumps over the conduction band of the semiconductor in 150 ps (2) and reaches the TCO. The holes produced during the excitation of dye molecules are scavenged by the electrons from the redox electrolyte (4) in 0.5 μs. The electrons reached the TCO then move to the cathode through the external circuit and power up the electrical load. Finally, the oxidized electrolyte gets reduced at the cathode (5) in 10 μs. [5,6] Besides these carrier-transport processes, some adverse reactions like nonradiative carrier-recombination paths will occur that desperately reduces the overall device performance. [7] Such unfavorable reactions are follows: nonradiative decay of immediate excitation of dye molecule to its ground state occurs in ns (6), plausible recombination of the electrons from the conduction band of the semiconductor material to the ground state of dye molecule occurs in ms (7), and to the electrolyte occurs in 100 ns to 1 ms (8), respectively. [8] The substrate for the photoanode and cathode is the most important component. Apart from this metal foil or polymeric film, transparent conductive oxide (TCO)-coated transparent glass substrate, such as fluorine-doped tin dioxide (FTO) or

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Reconstructing Ferroelectric Polarization Screening of PbTiO₃ by Epitaxial SrTiO₃ for Efficient Photocatalytic Overall Water Splitting

Du,

Huang,

et al. 2024

Adv Funct Materials

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A large depolarization field in single‐domain PbTiO3 is anticipated to drive the spatial separation of photogenerated charge carriers and enable potential active sites for photocatalytic overall water splitting reaction. However, the negatively polarized surface usually cannot provide sufficient active sites for water oxidation to oxygen because of lacking oxygen vacancies, inevitably hindering photocatalytic water splitting reaction. Here, the ferroelectric polarization screening is reconstructed by a heteroepitaxial SrTiO3 film on the positively polarized surface of PbTiO3 nanoplates to generate abundant oxygen vacancies on the negatively polarized surface as active sites for water oxidation. Moreover, it is experimentally and theoretically revealed that the epitaxial SrTiO3 layer on the positively polarized surface is also beneficial for good dispersion of cocatalyst and the formation of low Schottky barrier height at the interface between the heterostructure and the cocatalyst for efficient electron transfer. Compared with pristine PbTiO3, the obtained PbTiO3/SrTiO3 heteroepitaxial structure with the simultaneous regulation of positively and negatively polarized surfaces delivered a greatly enhanced photocatalytic overall water splitting with stoichiometric ratio (2:1) of hydrogen and oxygen evolution by a factor of 15 times. These findings might open up a new avenue for the design of ferroelectric photocatalysts with excellent activity.

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TiO2–SrTiO3 composite photoanode: effect of strontium precursor concentration on the performance of dye-sensitized solar cells

Cited by 21 publications

References 41 publications

Synergistic Effects of Plasmonic Gold and Perovskite-Type SrTiO₃ for Enhanced Photocatalytic Performance of TiO₂ Nanotube Arrays

Synergistic Effects of Plasmonic Gold and Perovskite-Type SrTiO₃ for Enhanced Photocatalytic Performance of TiO₂ Nanotube Arrays

Account of Structural, Theoretical, and Photovoltaic Properties of ABO₃ Oxide Perovskites Photoanode‐Based Dye‐Sensitized Solar Cells

Reconstructing Ferroelectric Polarization Screening of PbTiO₃ by Epitaxial SrTiO₃ for Efficient Photocatalytic Overall Water Splitting

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TiO2–SrTiO3 composite photoanode: effect of strontium precursor concentration on the performance of dye-sensitized solar cells

Cited by 21 publications

References 41 publications

Synergistic Effects of Plasmonic Gold and Perovskite-Type SrTiO3 for Enhanced Photocatalytic Performance of TiO2 Nanotube Arrays

Synergistic Effects of Plasmonic Gold and Perovskite-Type SrTiO3 for Enhanced Photocatalytic Performance of TiO2 Nanotube Arrays

Account of Structural, Theoretical, and Photovoltaic Properties of ABO3 Oxide Perovskites Photoanode‐Based Dye‐Sensitized Solar Cells

Reconstructing Ferroelectric Polarization Screening of PbTiO3 by Epitaxial SrTiO3 for Efficient Photocatalytic Overall Water Splitting

Contact Info

Product

Resources

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Synergistic Effects of Plasmonic Gold and Perovskite-Type SrTiO₃ for Enhanced Photocatalytic Performance of TiO₂ Nanotube Arrays

Synergistic Effects of Plasmonic Gold and Perovskite-Type SrTiO₃ for Enhanced Photocatalytic Performance of TiO₂ Nanotube Arrays

Account of Structural, Theoretical, and Photovoltaic Properties of ABO₃ Oxide Perovskites Photoanode‐Based Dye‐Sensitized Solar Cells

Reconstructing Ferroelectric Polarization Screening of PbTiO₃ by Epitaxial SrTiO₃ for Efficient Photocatalytic Overall Water Splitting