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Mixed-metal organic framework-coated ZnO nanowires array for efficient photoelectrochemical water oxidation
摘要： Designing of high-performance photoanodes is essential for efficient solar energy conversion in photoelectrochemical (PEC) water splitting. Herein, we report an effective approach to synthesize three dimensional (3D) mixed-metal organic framework-coated ZnO nanowires array (ZnNi MOF@ZnO) for the effective PEC performance. The ZnO nanowires act as photon absorber as well as rapid charge transporter; whilst the ZnNi MOF provides the active sites for PEC process by lowering the energy barrier of water oxidation and suppressing electron-hole recombination. The 3D nanostructure of ZnNi MOF@ZnO nanowires array provides intimate interfacial contact through covalent interactions between the ZnNi MOF and ZnO nanowires which facilitates the rapid charge transfer during photocatalytic oxygen evolution reactions. As a result, the ZnNi MOF@ZnO nanowires array exhibited excellent photoelectrochemical water oxidation with very low onset potential (0.31 V vs. RHE) and high photocurrent density (1.40 mA/cm2) as compared to the Zn MOF @ZnO and ZnO nanowires array. This facile strategy provides a promising direction towards high performance photoanode design for adequate solar energy conversion.
关键词： Metal organic frameworks (MOFs),Photoelectrocatalyst,Nanowires array,Photoelectrochemical water oxidation,Photoanodes
更新于2025-09-23 15:22:29
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The cost-effective deposition of ultra-thin titanium(IV) oxide passivating layers for improving photoelectrochemical activity of SnS electrodes
摘要： The structures of tin monosulfide (SnS) with the surface modified by ultrathin titanium(IV) oxide layers for potential photoinduced water splitting were successfully fabricated. SnS thin films were deposited onto glass/Mo substrates using high vacuum evaporation (HVE) method, and then a simple and cost-effective deposition-annealing cycling process was used to prepare titanium(IV) oxide passivated SnS structures. The resulting compositional properties were studied using X-ray diffractometry (XRD), Raman spectroscopy, high resolution scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDX). The effects of titanium(IV) oxide layers on the photo-electrochemical (PEC) activity of fabricated p-type SnS thin-film electrodes were examined in this study. The SnS layers passivated with titanium(IV) oxide exhibited reducing the SnS-electrolyte interface resistance, increasing the photocurrent and improving the efficiency of PEC cells as deleterious reactions are inhibited. The various electrochemical methods such as current-voltage measurements, cyclic voltammetry, and electrochemical impedance spectroscopy were used to characterise and analyse SnS structures modified by titanium(IV) oxide.
关键词： Photocathode,Solar energy,Tin sulfide,Titanium dioxide,Water splitting
更新于2025-09-23 15:22:29
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Reaction Packaging CoSe <sub/>2</sub> Nanoparticles in N-Doped Carbon Polyhedra with Bifunctionality for Overall Water Splitting
摘要： Water electrolysis is a promising approach for green and large-scale hydrogen production; however, there are still challenges for developing efficient and stable bi-functional electrocatalysts towards the hydrogen and oxygen evolution reactions. Herein, zeolitic imidazolate framework-67 (ZIF67) was used as the precursor for the construction of CoSe2 nanoparticles trapped in N-doped carbon polyhedra (NC). Among as-obtained CoSe2-NC hybrid, highly active CoSe2 nanoparticles in sizes of 10-20 nm are encapsulated in N-doped few-layer carbon shell, avoiding their easy aggregations of CoSe2 nanoparticles as well as enhancing the long-term stability. The unique nanostructured CoSe2-NC hybrid with a hierarchical porosity and 3D conductive framework thus fully exerts outstanding bi-functional catalytic activity of CoSe2 centers. As a result, the CoSe2-NC hybrid as bi-functional catalysts for overall water splitting delivers a high current density of 50 mA cm-2 with applied voltage of ~1.73 V in alkaline electrolyte, with a promising stability over 50000 s.
关键词： selenide reaction,ZIF67,bifunctional electrocatalyst,overall water splitting,carbon polyhedra
更新于2025-09-23 15:22:29
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[ACM Press the 2016 ACM International Joint Conference - Heidelberg, Germany (2016.09.12-2016.09.16)] Proceedings of the 2016 ACM International Joint Conference on Pervasive and Ubiquitous Computing Adjunct - UbiComp '16 - Experiential tangible UI for controlling lighting
摘要： In this demo we present a tangible UI concept for controlling the color of lighting. The interaction is performed by placing different color glass objects to a bowl of water. The system demonstrates an aesthetic design for a tangible UI, and aims to provide the user an experience-rich haptic UI. The demo aims towards decorative and calm UIs for home control systems. It seeks to hide conventional technology and switches, and is part of the ubiquitous computing design vision for calm computing.
关键词： Tangible user interface,water,calm computing,glass,light control systems,user experience
更新于2025-09-23 15:22:29
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Photocatalytic Overall Water Splitting on RuO <sub/>2</sub> -loaded Sm <sup>3+</sup> -doped CeO <sub/>2</sub> with Heterogenous Doping Structure
摘要： Photocatalytic overall water splitting into hydrogen and oxygen on RuO2-loaded Sm3+-doped CeO2 was examined. Pure CeO2 showed a negligible small activity, however Sm3+ doped CeO2 with heterogeneous doping structure synthesized by solid state reaction exhibited an efficient activity. Whereas, Sm3+-doped CeO2 with homogeneous doping structure showed little activity when prepared by co-precipitation method. In this study, relation between photocatalytic activity and surface doping structure was investigated.
关键词： Heterogeneous doping structure,Semiconductor photocatalyst,Overall water splitting
更新于2025-09-23 15:22:29
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An Effective Approach to Improve the Photocatalytic Activity of Graphitic Carbon Nitride via Hydroxyl Surface Modification
摘要： In this work, we have developed a hydrothermal method to modify g-C3N4 with hydroxyl surface modification. Modified g-C3N4 has exhibited higher photocatalytic activity in the removal of phenolic compounds under visible light. The improvement may be due to the following merits: (1) Tuning of the hydrophobic surface of g-C3N4 to be hydrophilic; (2) improved adsorption energy, and (3) narrowed band gap for g-C3N4 after hydroxyl surface modification. This method is easy-to-operate, very effective in adding hydroxyl groups on the surface of C3N4, and may be extended to other systems to promote their photocatalytic activities in water treatment.
关键词： water treatment,photocatalysis,hydroxyl,surface modification,g-C3N4
更新于2025-09-23 15:22:29
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A Photoresponsive Rutile TiO <sub/>2</sub> Heterojunction with Enhanced Electron-Hole Separation for High-Performance Hydrogen Evolution
摘要： Rutile titanium dioxide (TiO2) is a promising photocatalyst due to its high thermodynamic stability and few intragrain defects. However, it has not yet achieved photocatalytic activity comparable to that of anatase TiO2 owing to its higher recombination rate of electron–hole pairs. To effectively separate the electron–hole pairs in rutile TiO2, a facet heterojunction (FH) structure to prolong the lifetime of the photogenerated electrons is proposed. Ultrathin TiO2 nanosheets with different facets are coated in situ onto TiO2 nanorod (NR) substrates, where FHs are built among the nanosheets as well as between the nanosheets and NR substrates. The as-prepared rutile TiO2, with an FH structure (FH-TiO2), serves as an effective photocatalyst for water splitting. More than 45 and 18 times higher photogenerated current density and H2 production rate, respectively, are obtained compared to those of pure rutile TiO2 NRs. Moreover, FH-TiO2 delivers a 0.566 mmol g?1 h?1 H2 production rate even in pure water. This study offers important insights into the rational design of rutile TiO2 structures for highly efficient photocatalytic reactions.
关键词： charge separation,rutile TiO2,facet heterojunction,water splitting
更新于2025-09-23 15:22:29
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The role of synthesis conditions for structural defects and lattice strain in β-TaON and their effect on photo- and photoelectrocatalysis
摘要： The importance of the synthesis conditions on the structural and photocatalytic properties of tantalum oxide nitride was investigated by comparing two variants of phase-pure β-TaON obtained from application of two different synthesis routes, leading to one unstrained and one heavily anisotropically microstrained β-TaON as shown by XRD-based Rietveld refinement. HRTEM images reveal the origin of the strain to be lattice defects such as stacking faults. The strained β-TaON was found to be the clearly less active semiconductor in photochemical and photoelectrochemical water oxidation. The lattice defects are assumed to act as charge carrier traps hindering the photo-generated holes to be displaced to the reaction sites at the surface.
关键词： tantalum oxide nitride,photocatalysis,photoelectrochemistry,water splitting,structural defects
更新于2025-09-23 15:22:29
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Study on supercritical water oxidation of o-dichlorobenzene in a quartz micro-reactor with in situ microscope and Raman spectroscopy
摘要： The supercritical water oxidation (SCWO) of o-dichlorobenzene (o-DCB) in a fused quartz capillary reactor was studied by in situ microscope combined with Raman spectroscopy. The influence of oxidant dosage, reaction temperature and time on the o-DCB degradation efficiency was investigated and the reaction kinetics for CO2 yield was explored as well. The obvious phase change of o-DCB-H2O/H2O2 system was observed during the heating and cooling process. The increase in H2O2 dosage, temperature and time enhanced the o-DCB degradation efficiency. The degradation of o-DCB could be attributed to the simultaneous oxidation induced by HO· and O2. The effect of temperature on the o-DCB degradation efficiency and the CO2 yield was not significant at the lower temperature stage but turned to be important at the higher temperature stage. When the oxidant dosage was twice that of chemometry and the temperature and time were 440.0 °C and 4 min, respectively, the o-DCB degradation efficiency reached approximately 100%. Under the same conditions, the CO2 yield was lower than the o-DCB degradation efficiency, indicating that the degradation of o-DCB was a multi-step reaction. The reaction kinetics showed that the kinetics of CO2 production in SCWO followed the pseudo-first order and the apparent activation energy was 172.4 kJ mol?1.
关键词： Microscope,Supercritical water oxidation,O-dichlorobenzene,Fused quartz micro-reactor,Raman spectroscopic
更新于2025-09-23 15:22:29
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Synthesis of oxygen deficient bismuth oxide photocatalyst for improved photoelectrochemical applications
摘要： The present paper reports the effect of nitrogen modification on photoelectrochemical (PEC) water oxidation behavior of Bi2O3 semiconductor thin film. The semiconductor particles were synthesized via hydrothermal route using Bi(NO3)3 as a Bi3+ ion precursor and urea as the nitrogen source followed by drop-cast the particles and annealing the film at 600oC. The synthesized Bi2O3 exhibited band gap energy of 3.01 eV, calculated from the UV-vis absorption spectrum which decreases to 2.75eV through N-modification. Water oxidation behavior of the material has been tested through linear sweep voltammetry under periodic illumination. Highest photo-current of 180 μAcm-2 has been measured for water oxidation reaction at 0.95V vs. Ag/AgCl, under illumination of 35mWcm-2. N-incorporation can enhance the photocurrent up to 50% whereas the visible responsiveness of the material improves significantly as confirmed from electrochemical action spectra and UV-visible absorption spectra. The photocatalytic activity of the semiconductor particles was confirmed through decoloration of Rhodamine-B dye, by spectrophotometric measurements.
关键词： Hydrothermal synthesis,Oxygen vacancies,Bismuth oxide photocatalyst,PEC water oxidation.,N-modification
更新于2025-09-23 15:22:29