Silver-Loaded Titania-Based Metal-Organic Frameworks as a Platform for Silver Ion Release for Antibacterial Applications.

Conventional Ag-decorated TiO coatings suffer from low adsorption capacity and burst release kinetics, limiting long-term antibacterial efficacy and risking cytotoxicity. An entirely different payload release approach can be based on metal-organic frameworks (MOFs), which offer tunable porosity, high surface area, and internal diffusion channels. Here, we report a thermally stabilized Ti-based MOF [NH-MIL-125(Ti)] functionalized with Ag via reactive deposition, enabling high Ag loading (∼14.

Cation Vacancies in Ti-Deficient TiO Nanosheets Enable Highly Stable Trapping of Pt Single Atoms for Persistent Photocatalytic Hydrogen Evolution.

The stabilization of single-atom catalysts on semiconductor substrates is pivotal for advancing photocatalysis. TiO, a widely employed photocatalyst, typically stabilizes single atoms at oxygen vacancies-sites that are accessible but prone to agglomeration under illumination. Here, we demonstrate that cation vacancies in Ti-deficient TiO nanosheets provide highly stable anchoring sites for Pt single atoms, enabling persistent photocatalytic hydrogen evolution.

Pt Single Atom Deposition by Direct Current Sputtering in the Gas-Scattering Regime-A Simple Approach to Controlled Single Atom Loading.

Supported single atoms represent a new frontier in many catalytic fields, and noble metal single atoms in particular have been reported to be a highly effective cocatalyst in photocatalysis or electrocatalysis. Herein, it is described that direct current sputtering of Pt, when operated under plain gas-scattering conditions, can be leveraged for single atom deposition on various substrates (herein TiO and graphene are used as examples). The approach allows a uniform single atom deposition with a high level of control over single atom density and loading amount on both surfaces.

Polydisperse Pt Deposits Over TiO-Nanotube-Array-Supported Ru Nanoparticles: Harnessing the Interfacial Synergy for Efficient Hydrogen Evolution Electrocatalysis.

Developing cost-effective precious metal electrocatalysts for the hydrogen evolution reaction (HER) is key to realizing the economic viability of acidic water electrolysis. Herein, galvanic displacement is employed for in situ formation of bimetallic Pt/Ru deposits on H-intercalated TiO nanotube arrays. It is found that a two-step procedure yields polydisperse deposits with a dominant fraction of Ru nanoparticles coated with atomic and subnanometric Pt islands.

p-Type TiO Nanotubes: Quantum Confinement and Pt Single Atom Decoration Enable High Selectivity Photocatalytic Nitrate Reduction to Ammonia.

We synthesize p-type TiO nanotubes that allow band-gap adjustment by quantum confinement. These tubes therefore enable reductive photocatalytic reactions that are not thermodynamically possible on classic titania photocatalysts. Here, we demonstrate the direct photocatalytic nitrate reduction to ammonia without any need of hole scavengers.

Ultrathin Ti-Deficient TiO Nanosheets with Pt Single Atoms Enable Efficient Photocatalytic Nitrate Reduction to Ammonia.

Ti-deficient TiO nanosheets derived from lepidocrocite-type titanate delamination show a p-type conductivity with a band gap widened by the quantum confinement effect to 3.7 eV. This shift in the extended band positions─and thus in the electron transfer level─allows a direct photocatalytic nitrate reduction to ammonia without the use of any hole scavengers; this in contrast to classic TiO.

Lateral Spacing of TiO Nanotube Coatings Modulates In Vivo Early New Bone Formation.

Due to the bio-inert nature of titanium (Ti) and subsequent accompanying chronic inflammatory response, an implant's stability and function can be significantly affected, which is why various surface modifications have been employed, including the deposition of titanium oxide (TiO) nanotubes (TNTs) onto the native surface through the anodic oxidation method. While the influence of nanotube diameter on cell behaviour and osteogenesis is very well documented, information regarding the effects of nanotube lateral spacing on the in vivo new bone formation process is insufficient and hard to find. Considering this, the present study's aim was to evaluate the mechanical properties and the osteogenic ability of two types of TNTs-based pins with different lateral spacing, e.

Single Atom Cocatalysts in Photocatalysis.

Single-atom (SA) cocatalysts (SACs) have garnered significant attention in photocatalysis due to their unique electronic properties and high atom utilization efficiency. This review provides an overview of the concept and principles of SA cocatalyst in photocatalysis, emphasizing the intrinsic differences to SAs used in classic chemical catalysis. Key factors that influence the efficiency of SAs in photocatalytic reactions, particularly in photocatalytic hydrogen (H) production, are highlighted.

Platinum Single Atoms Strongly Promote Superoxide Formation in Titania-Based Photocatalysis - Platinum Nanoparticles Don't.

The selective reduction of molecular oxygen to superoxide is one of the key reactions in electrochemistry and photocatalysis. Here the effect of Pt co-catalysts, dispersed on titania, either as single atoms or as nanoparticles, on the photocatalytic superoxide (O ) formation in O containing solutions is investigated. The O formation is traced by nitroblue tetrazolium (NBT) assays and in detail by EPR measurements using TEMPO as O radical scavenger.

Pd single atoms on g-CN photocatalysts: minimum loading for maximum activity.

Noble metal single atoms (SAs) on semiconductors are increasingly explored as co-catalysts to enhance the efficiency of photocatalytic hydrogen production. In this study, we introduce a "spontaneous deposition" approach to anchor Pd SAs onto graphitic carbon nitride (g-CN) using a highly dilute tetraaminepalladium(ii) chloride precursor. Maximized photocatalytic activity and significantly reduced charge transfer resistance can be achieved with a remarkably low Pd loading of 0.

Platinum single atoms on titania aid dye photodegradation whereas platinum nanoparticles do not.

The photocatalytic degradation of unwanted organic species has been investigated for decades using modified and non-modified titania nanostructures. In the present study, we investigate the co-catalytic effect of single atoms (SAs) of Pt and Pt nanoparticles on titania substrates on the degradation of the two typical photodegradation model pollutants: Acid Orange 7 (AO7) and Rhodamine B (RhB). For this, we use highly defined sputter deposited anatase layers and load them with Pt SAs at different loading densities or alternatively with Pt nanoparticles.

Single-Atom Catalysts on CN: Minimizing Single Atom Pt Loading for Maximized Photocatalytic Hydrogen Production Efficiency.

The use of metal single atoms (SAs) as co-catalysts on semiconductors has emerged as a promising technology to enhance their photocatalytic hydrogen production performance. In this study, we describe the deposition of very low amounts of Pt SAs (<0.1 at %) on exfoliated graphitic carbon nitride (CN) by a direct Pt-deposition approach from highly dilute chloroplatinic acid precursors.

Enzyme-free detection of creatinine as a kidney dysfunction biomarker using TiO flow-through membranes.

TiO nanotube flow-through membranes (TNTsM) were fabricated anodization of Ti foil and explored as a biosensing platform for creatinine detection. The electrodes were prepared in different configurations including TNT membrane with top surface up (TNTsMTU/TNPs/FTO), TNT membrane with bottom surface up (TNTsMBU/TNPs/FTO), TNT membrane with top surface up containing nanograss (TNTsMNG/TNPs/FTO), and TNTs/NPs/FTO and TiO nanoparticles (TNPs) film on fluorine doped tin oxide (TNPs/FTO). Electrochemical studies depict the higher electrochemical activity (sensitivity ∼19.

Enhanced Photocatalytic Paracetamol Degradation by NiCu-Modified TiO Nanotubes: Mechanistic Insights and Performance Evaluation.

Anodic TiO nanotube arrays decorated with Ni, Cu, and NiCu alloy thin films were investigated for the first time for the photocatalytic degradation of paracetamol in water solution under UV irradiation. Metallic co-catalysts were deposited on TiO nanotubes using magnetron sputtering. The influence of the metal layer composition and thickness on the photocatalytic activity was systematically studied.

Pt Single Atoms Loaded on Thin-Layer TiO Electrodes: Electrochemical and Photocatalytic Features.

Recently, the use of Pt in the form of single atoms (SA) has attracted considerable attention to promote the cathodic hydrogen production reaction from water in electrochemical or photocatalytic settings. First, produce suitable electrodes by Pt SA deposition on Direct current (DC)-sputter deposited titania (TiO) layers on graphene-these electrodes allow to characterization of the electrochemical properties of Pt single atoms and their investigation in high-resolution HAADF-STEM. For Pt SAs loaded on TiO, electrochemical H evolution shows only a very small overpotential.

Multifunctional tunable CuO and CuInS quantum dots on TiO nanotubes for efficient chemical oxidation of cholesterol and ibuprofen.

In this study, a CuInS/CuO/TiO nanotube (TNT) heterojunction-based hybrid material is reported for the selective detection of cholesterol and ibuprofen. Anodic TNTs were co-decorated with CuO and CuInS quantum dots (QDs) using a modified chemical bath deposition (CBD) method. QDs help trigger the chemical oxidation of cholesterol by cathodically generating hydroxyl radicals (˙OH).

Pt Single Atoms on TiO Can Catalyze Water Oxidation in Photoelectrochemical Experiments.

Photoelectrochemical water splitting on n-type semiconductors is highly dependent on catalysis of the rate-determining reaction of O evolution. Conventionally, in electrochemistry and photoelectrochemistry O evolution is catalyzed by metal oxide catalysts like IrO and RuO, whereas noble metals such as Pt are considered unsuitable for this purpose. However, our study finds that Pt, in its single-atom form, exhibits exceptional cocatalytic properties for photoelectrochemical water oxidation on a TiO photoanode, in contrast to Pt in a nanoparticle form.

Correction: α-FeO/TiO 3D hierarchical nanostructures for enhanced photoelectrochemical water splitting.

Correction for 'α-FeO/TiO 3D hierarchical nanostructures for enhanced photoelectrochemical water splitting' by Hyungkyu Han , , 2017, , 134-142, https://doi.org/10.1039/C6NR06908H.

Stable and Highly Active Single Atom Configurations for Photocatalytic H Generation.

The employment of single atoms (SAs), especially Pt SAs, as co-catalysts in photocatalytic H generation has gained significant attention due to their exceptional efficiency. However, a major challenge in their application is the light-induced agglomeration of these SAs into less active nanosized particles under photocatalytic conditions. This study addresses the stability and reactivity of Pt SAs on TiO surfaces by investigating various post-deposition annealing treatments in air, Ar, and Ar-H environments at different temperatures.

Correction to "Band Gap and Morphology Engineering of Hematite Nanoflakes from an Sn Doping for Enhanced Photoelectrochemical Water Splitting".

[This corrects the article DOI: 10.1021/acsomega.2c04028.

Photocatalytic H Generation: Controlled and Optimized Dispersion of Single Atom Co-Catalysts Based on Pt-TCPP Planar Adsorption on TiO.

When using single atoms (SAs) as a co-catalyst in photocatalytic H generation, achieving a well-dispersed, evenly distributed and adjustable SA surface density on a semiconductor surface is a challenging task. In the present work we use the planar adsorption of tetrakis-(4-carboxyphenyl)-porphyrin (TCPP) and its platinum coordinated analogue, Pt-TCPP, onto anatase TiO surfaces to establish a spatially controlled decoration of SAs. We show that the surface Pt SA density can be very well controlled by co-adsorption of Pt-TCPP and TCPP in the planar monolayer regime, and by adjusting the Pt-TCPP to TCPP ratio a desired well dispersed surface density of SAs up to 2.

Nanoscale Topography of Anodic TiO Nanostructures Is Crucial for Cell-Surface Interactions.

Anodic titanium dioxide (TiO) nanostructures, i.e., obtained by electrochemical anodization, have excellent control over the nanoscale morphology and have been extensively investigated in biomedical applications owing to their sub-100 nm nanoscale topography range and beneficial effects on biocompatibility and cell interactions.

2D Metal-Organic Framework Nanosheets based on Pd-TCPP as Photocatalysts for Highly Improved Hydrogen Evolution.

In this report, a 2D MOF nanosheet derived Pd single-atom catalyst, denoted as Pd-MOF, was fabricated and examined for visible light photocatalytic hydrogen evolution reaction (HER). This Pd-MOF can provide a remarkable photocatalytic activity (a H production rate of 21.3 mmol/gh in the visible range), which outperforms recently reported Pt-MOFs (with a H production rate of 6.

Enhanced Photocatalytic H Generation by Light-Induced Carbon Modification of TiO Nanotubes.

Titanium dioxide (TiO) is the material of choice for photocatalytic and electrochemical applications owing to its outstanding physicochemical properties. However, its wide bandgap and relatively low conductivity limit its practical application. Modifying TiO with carbon species is a promising route to overcome these intrinsic complexities.

Metastable Ni(I)-TiO Photocatalysts: Self-Amplifying H Evolution from Plain Water without Noble Metal Co-Catalyst and Sacrificial Agent.

Decoration of semiconductor photocatalysts with cocatalysts is generally done by a step-by-step assembly process. Here, we describe the self-assembling and self-activating nature of a photocatalytic system that forms under illumination of reduced anatase TiO nanoparticles in an aqueous Ni solution. UV illumination creates a Ni/TiO/Ti photocatalyst that self-activates and, over time, produces H at a higher rate.