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Open research questions in TiO2 Photocatalysis and Solar Cells

90 gap statements mined from TiO2 Photocatalysis and Solar Cells papers in our 4.5M-paper local library, which holds 1,330 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • There is a need to understand the effect of calcination temperature on the structural and morphological properties of TiO2 nanoparticles. The phase transformation of TiO2 nanoparticles from anatase to rutile at higher temperatures is not well understood.

    Calcination effect on the properties of sol–gel synthesized TiO2 nanomaterials · 2026 · DOI

  • The lack of understanding of facet-dependent CO adsorption on anatase TiO2 surfaces. The need for mechanistic insights into the adsorption behavior. The importance of considering surface topology in determining adsorption characteristics.

    Mechanistic insights into facet-dependent CO adsorption and vibrational responses on anatase TiO2: periodic quantum-mechanical calculations · 2026 · DOI

  • Reusability and photostability of neem-mediated Ag-ZnO bimetallic nanoparticles across multiple degradation cycles have not been evaluated. Prior work on green-synthesized metal oxide photocatalysts demonstrates good stability (e.g., Zn-TiO2 retaining >73% activity after four cycles), but long-term performance and leaching behavior of neem-capped Ag-ZnO systems remain uncharacterized.

    Heterogenous Photocatalytic Degradation of Sugarcane Distillery Spent Wash by using Mesoporous Zn-TiO2 Catalyst · 2026 · DOI

  • The size-dependent bioactivity of TiO2 NPs has been poorly documented. There is a need for a comprehensive study on the size-dependant properties and bioapplications of TiO2 NPs.

    Sol-gel Synthesis and Characterization of Titanium Dioxide Nanoparticles at 400 oC and Their Biological Applications · 2026 · DOI

  • Conventional adsorption methods are ineffective under high-humidity conditions. There is a need for a sustainable strategy for effective ammonia emission control. The effects of zeolite type and humidity on photocatalytic ammonia removal are not well understood.

    Effects of Zeolite LTA Type and Humidity on Photocatalytic Ammonia Removal over TiO2-Coated Supports · 2026 · DOI

  • The need for innovative materials capable of accurately detecting and degrading pollutants. The lack of understanding of the synergistic relationships among gas sensing, photocatalysis, piezoelectric, and piezo-photocatalytic activities.

    Environmentally Responsive Ag/BaTiO 3 /TiO 2 Nanocomposite for Selective Gas Sensing and Advanced Piezo-Photocatalysis · 2026 · DOI

  • Future research can focus on the experimental synthesis and characterization of the copper complexes. Future research can also explore the use of other metal complexes as redox mediator electrolytes for DSSC application.

    Computational Studies of Pyridyl Imidazole Copper Complexes as Redox Mediator Electrolytes for Dye Sensitized Solar-Cell (DSSC) Application · 2026 · DOI

  • The need for efficient near-infrared photosensitizers. The lack of understanding of the relaxation processes of conjugated polymers in solution versus on TiO2 films.

    A conjugated polymer photosensitizer for energy conversion applications · 2026 · DOI

  • There is a need for further research on scaling TiO2-based photocatalysis toward practical water treatment applications. The economic feasibility and environmental impact of this technology need to be evaluated.

    Recent advances in photocatalytic degradation of organic dye wastewater using titanium dioxide: a review · 2026 · DOI

  • The photocatalytic activity of titanium dioxide nanolayers needs to be improved. There is a lack of studies on the effect of doping with metallic elements on the photocatalytic efficiency and electro-optical properties of titanium dioxide nanolayers.

    Increasing the photocatalytic efficiency and electro-optical properties of titanium dioxide nanolayers doped with copper, silver and gold elements · 2026 · DOI

  • The need for environmentally benign and sustainable treatment strategies for dye pollution. The lack of efficient photocatalysts for the degradation of methylene blue.

    Magnetically recoverable AgFe2O4/TiO2 nanocomposites for enhanced photocatalytic degradation of methylene blue under UV light · 2026 · DOI

  • The decomposition of doxycycline is a significant environmental problem. Prior work has not investigated the use of a Tb/Mg-doped TiO₂ photocatalyst prepared by a liquid-phase plasma synthesis method.

    Decomposition Characteristics of Doxycycline by Visible-Light-Active Tb/Mg-Doped TiO₂ Photocatalyst Prepared using Liquid-Phase Plasma Synthesis Method · 2026 · DOI

  • Lack of sustainable treatment methods for cheese wastewater. Significant environmental hazards associated with cheese wastewater.

    Doped and Codoped TiO2: Synthesis, Characterization and Application on Cheese Effluents Treatment · 2026 · DOI

  • The study suggests that future research should focus on developing new approaches that combine green synthesis with advanced characterization techniques. The study emphasizes the need for standardized reporting on green reagents and thermal history to achieve reproducible property modulation.

    SYNTHESIS–STRUCTURE RELATIONSHIPS IN GREEN-SYNTHESIZED TIO₂ NANOPARTICLES: IMPLICATIONS FOR PHYSICOCHEMICAL PROPERTIES · 2026 · DOI

  • This review critically examines the evolution of porphyrin sensitizers in dye sensitized solar cells using a loss aware framework, revealing that efficiency plateaus in metalloporphyrin based DSSCs are predominantly structural rather than incidental.

    Critical review of metalloporphyrin drawbacks and additive adverse effects in porphyrin DSSCs toward high efficiency metal free porphyrin sensitizers · 2026 · DOI

  • The development of novel sensitizers is crucial for improving the efficiency of DSSCs. Ru-based sensitizers have drawbacks, including toxicity and high cost, necessitating their modification.

    Molecular engineering of diphenylamine-based co-sensitizers for enhanced photovoltaic performance in DSSCs: Achieving a 33 percent improvement over N719 · 2026 · DOI

  • Limited visible-light absorption of TiO2 nanoparticles. Electrostatic repulsion and reduced Cr(VI) adsorption at neutral to mildly acidic conditions.

    Visible-light-driven photocatalytic reduction of Cr(VI) over EDTA–TiO2 through surface complexation and ligand-to-metal charge transfer · 2026 · DOI

  • The limited visible-light absorption of TiO2 nanoparticles constrains the overall efficiency and practical scalability of heterojunction systems. The interfacial recombination losses of photogenerated electron-hole pairs limit the efficiency of heterojunction systems.

    Visible-light-driven photocatalytic reduction of Cr(VI) over EDTA–TiO2 through surface complexation and ligand-to-metal charge transfer · 2026 · DOI

  • The study aims to investigate the impact of pH on the properties of TiO2 nanoparticles.

    Influence of pH on the Sol-Gel Synthesis of TiO2 Nanoparticles: Structural, Morphological, and Surface Properties · 2026 · DOI

  • Experimental verification of the study's findings. Investigation of CO adsorption on other TiO2 surfaces. Application of the study's methods to other surface chemistry phenomena.

    Mechanistic insights into facet-dependent CO adsorption and vibrational responses on anatase TiO2: periodic quantum-mechanical calculations · 2026 · DOI

  • Further investigation of the effect of electron-withdrawing units on charge separation and interfacial recombination. Development of more efficient co-sensitization strategies for DSSCs. Exploration of the potential of diphenylamine-based co-sensitizers for other photovoltaic applications.

    Molecular engineering of diphenylamine-based co-sensitizers for enhanced photovoltaic performance in DSSCs: Achieving a 33 percent improvement over N719 · 2026 · DOI

  • The paper identifies a gap in the study of pyridyl imidazole copper complexes as redox mediator electrolytes for DSSC application. The paper aims to fill this gap by providing a computational study of the redox potentials and VOC values of the complexes.

    Computational Studies of Pyridyl Imidazole Copper Complexes as Redox Mediator Electrolytes for Dye Sensitized Solar-Cell (DSSC) Application · 2026 · DOI

  • Further studies on the scalability and industrial applicability of the SnO2–TiO2/PP nanocomposite, - Investigation of the photocatalytic activity of the SnO2–TiO2/PP nanocomposite under different light sources…

    Green synthesis of SnO2–TiO2 nanocomposite using pomegranate peel extract for efficient photocatalytic degradation of Alizarin Red dye · 2026 · DOI

  • Investigating the long-term storage stability of CITNPs. Evaluating the reusability of CITNPs over a larger number of consecutive cycles. Exploring the application of CITNPs in various industrial fields.

    Development and Characterisation of TiO2 Nanoparticles Immobilised With Catalase via Functionalised Intermediates · 2026 · DOI

  • Further optimization of the operating conditions for effluent treatment using Ag-doped TiO2. Investigation of the scalability and practicality of the proposed approach. Exploration of other potential applications of doped and codoped titanium dioxide nanoparticles in wastewater treatment.

    Doped and Codoped TiO2: Synthesis, Characterization and Application on Cheese Effluents Treatment · 2026 · DOI

Most-cited papers in TiO2 Photocatalysis and Solar Cells

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Open questions raised by papers listed on this page include: (1) There is a need to understand the effect of calcination temperature on the structural and morphological properties of TiO2 nanoparticles (“Calcination effect on the properties of sol–gel synthesized TiO2 nanomaterials”, 2026); (2) The lack of understanding of facet-dependent CO adsorption on anatase TiO2 surfaces (“Mechanistic insights into facet-dependent CO adsorption and vibrational…”, 2026); (3) Reusability and photostability of neem-mediated Ag-ZnO bimetallic nanoparticles across multiple degradation cycles have not been evaluated (“Heterogenous Photocatalytic Degradation of Sugarcane Distillery Spent Wash by…”, 2026); (4) There is a need for a comprehensive study on the size-dependant properties and bioapplications of TiO2 NPs (“Sol-gel Synthesis and Characterization of Titanium Dioxide Nanoparticles at 400…”, 2026); (5) There is a need for a sustainable strategy for effective ammonia emission control (“Effects of Zeolite LTA Type and Humidity on Photocatalytic Ammonia Removal over…”, 2026). 90 gap statements have been mined from TiO2 Photocatalysis and Solar Cells papers in our 4.5M-paper local library, which holds 1,330 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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