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Open research questions in Advanced Photocatalysis Techniques

196 unresolved questions extracted from the limitations and future-work sections of 1,608 Advanced Photocatalysis Techniques papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Developing more eco-friendly and efficient substitute technologies - Enhancing selectivity and reducing H 2 O 2 breakdown in surface redox reactions - Improving the efficiency of light absorption - Constructing three-phase interfaces - Regulating asymmetric wettability

    Catalyst Engineering for Photocatalytic Hydrogen Peroxide Production: State-of-the-Art Progress and Future Perspectives · 2026 · DOI

  • Restricted activity under UV irradiation, - Rapid charge recombination, - Wide band gaps, - Efficiency and stability challenges persist

    Advances in Photoassisted and Photocatalytic Processes for Water Remediation · 2026 · DOI

  • Developing more efficient and scalable treatment systems, - Improving photocatalytic performance under visible light, - Integrating photocatalysis with other treatment technologies

    Advances in Photoassisted and Photocatalytic Processes for Water Remediation · 2026 · DOI

  • Exploring how semiconductor structure controls charge carrier dynamics and thereby catalytic performance - Investigating the potential of C3N4-Ru hybrid photoelectrodes for solar-driven ammonia oxidation

    Light-driven ammonia electrooxidation via carbon nitride–ruthenium molecular interfaces · 2026 · DOI

  • The paper identifies the challenges faced by CdS in photoelectrochemical water splitting, including bulk carrier recombination and diminished conductivity. It also mentions the need to stabilize the inconsistent output of electricity derived from solar energy. The challenges of charge transfer resistance and electron lifetime are also discussed.

    Fabrication of ZnO Scaffolded CdS Nanostructured Photoanodes with Enhanced Photoelectrochemical Water Splitting Activity under Visible Light · 2024 · DOI

  • Further research could investigate the use of different materials and structures to enhance photoelectrochemical properties. Research could also focus on scaling up the production of ZnO/CdS nanostructures. The study of the long-term stability and durability of the ZnO/CdS photoelectrodes could be a direction for future research.

    Fabrication of ZnO Scaffolded CdS Nanostructured Photoanodes with Enhanced Photoelectrochemical Water Splitting Activity under Visible Light · 2024 · DOI

  • No study to date has reported photoelectrocatalytic ammonia oxidation at a C3N4-Ru hybrid photoelectrode

    Light-driven ammonia electrooxidation via carbon nitride–ruthenium molecular interfaces · 2026 · DOI

  • Regrettably, the specific impact of the LSPR effect of precious metals on the ultrafast interfacial charge transfer and its kinetic characteristics remains inadequately explored in photocatalystic systems.

    Plasmon-Induced Ultrafast Interfacial Charge Transfer for Enhanced Photocatalytic Hydrogen Evolution · 2025 · DOI

  • Despite its advantage in visible-light response and stability, the pristine bismuth vanadate (BiVO 4 ) alone is not capable of achieving overall water splitting due to its conduction band energy level being insufficient for the proton reduction reaction, further limited by the severe charge recombination.

    Bismuth Vanadate Capable of Driving One-Step-Excitation Photocatalytic Overall Water Splitting · 2025 · DOI

  • However, few reports have summarized the research on D-A type PCN at the molecular level.

    Donor–Acceptor Type Carbon Nitride Photocatalysts in Photocatalysis: Current Understanding, Applications and Challenges · 2025 · DOI

  • Crucially, Pt atoms anchored at Ti4+ vacancies display remarkable resistance to light‐induced agglomeration, a key limitation of conventional single‐atom photocatalysts.

    Cation Vacancies in Ti‐Deficient TiO2 Nanosheets Enable Highly Stable Trapping of Pt Single Atoms for Persistent Photocatalytic Hydrogen Evolution · 2025 · DOI

  • Abstract Strong Metal‐Support Interaction (SMSI) is a key concept in heterogeneous catalysis, but it remains underexplored in the context of photon‐to‐hydrogen conversion, as coupling of metallic nanoparticles with photocatalysts is overlooked and only discussed in terms of Schottky barrier formation.

    Oxygen Vacancy Formation at Metal‒TiO₂ Interface Yielding Enhanced Photocatalytic Hydrogen Generation · 2025 · DOI

  • However, its practical application is limited by the metastability of the 1T phase and inconsistent doping, which result in nonuniform Schottky barrier heights and inefficient charge transfer, ultimately restricting catalytic performance and long-term stability.

    Single-Atom Engineering and Phase-Transition Optimization in MoS2 for Enhanced Schottky Junction Piezocatalysis · 2025 · DOI

  • Future research will focus on their scalability and visible-light photocatalytic performance to enhance their applications in environmental remediation and biomedical applications.

    Studies on Photocatalytic and Antioxidant Efficacy of Ag-Embedded ZnO Nanocomposites · 2025 · DOI

  • Nevertheless, a simple and mild method for introducing a N dopant into BiVO 4 remains lacking.

    Plasma Treatment Induced Oxygen Vacancies and N Doping in the BiVO 4 Photoanode toward Improved Charge Transfer and Facilitated Water Oxidation · 2025 · DOI

  • However, the origin of this improvement and the distinct roles of TMCs remain controversial topics.

    In Operando Visualization of Charge Transfer Dynamics in Transition Metal Compounds on Water Splitting Photoanodes · 2025 · DOI

  • However, CP-based catalysts for CO 2 photoreduction are limited by their poor recyclability and weak light absorption.

    A Zn(II) Coordination Polymer as an Ultrastable Heterogeneous Photocatalyst for CO2 Photoreduction with H2O · 2025 · DOI

  • However, its efficacy is limited by a fast electron hole recombination, a restricted quantity of active sites, and a modest absorption in the visible range.

    g-C3N4 Modified with Metal Sulfides for Visible-Light-Driven Photocatalytic Degradation of Organic Pollutants · 2025 · DOI

  • The condensed allotrope, namely, poly(triazine imide) (PTI) with extended conjugation and a crystallized structure, indeed holds more favorable compositional and structural advantages for photocatalytic CO 2 reduction but remains to be fully exploited.

    Poly(triazine imide) Crystals for Efficient CO 2 Photoreduction: Surface Pyridine Nitrogen Dominates the Performance · 2025 · DOI

  • Local polarization electric field (LPEF) induced by defects has been known to enhance charge separation, yet the synergistic effects and mechanisms related to different types of defects in pure phases remain poorly understood.

    Oxygen and Bromine Vacancies Synergistically Induce Local Polarization Electric Field for Enhanced Photocatalytic Nitrogen Fixation on BiOBr · 2025 · DOI

  • Natural benzaldehyde, an important spice-type flavor component and raw pharmaceutical material, is scarcely due to the escalating demand and consumer preference for natural foods.

    B/g-C 3 N 4 for Selectively Regulating Oxygen-Guided Photocatalytic Oxidation of Cinnamaldehyde to Benzaldehyde: Effects of Boron Sources · 2025 · DOI

  • Hydrogen spillover has been widely recognized as a pivotal phenomenon in heterogeneous catalysis, yet the global impact of active hydrogen species on support materials remains underexplored, hindering the establishment of robust structure–performance correlations.

    In Situ Dynamic Structural Changes of Ruthenium-Loaded MoO 3 for Photothermal Catalytic CO 2 Reduction · 2025 · DOI

  • Further investigation of the effect of coadsorbed water molecules shows that hydrogen bonding with water stabilizes FA in a monodentate configuration.

    Pathways of Photocatalytic Oxidation of Formic Acid on Dry and Hydrated Anatase TiO 2 Surfaces · 2025 · DOI

  • High Resolution Image Download MS PowerPoint Slide The requirement that photogenerated holes accumulate to drive the rate-limiting step is thought to cause slow water oxidation by TiO 2 to form O 2; however, detailed kinetic studies that directly establish the connection between photoabsorption and surface reactions have not been reported.

    Influence of Hole Transport and Thermal Reactions in Photo-Driven Water Oxidation Kinetics on Crystalline TiO 2 · 2025 · DOI

  • Special attention is given to emerging and underexplored metals and metal compounds/complexes, highlighting their potential to significantly enhance the performance of CdS-based photocatalysts and guide the development of next-generation systems.

    Metal-based co-catalysts in semiconductor CdS hybrid nanostructures for enhanced photocatalysis: material design, mechanisms, and emerging trends · 2025 · DOI

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196 open questions have been extracted from the limitations and future-work passages of 1,608 Advanced Photocatalysis Techniques papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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