- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
White Painting Pigment as a Low-Cost Light Scattering Material for Bilayer Photoelectrodes of Dye-Sensitized Solar Cells
摘要： White pigment (DuPont R902+) has been used as a light scattering material in the preparation of bilayer photoelectrodes of dye-sensitized solar cells (DSCs). The X-ray diffraction (XRD) pattern of the white pigment revealed that the material consists of rutile phase of titanium dioxide. The light scattering layer prepared from the white pigment was coated onto the main-layer of the photoelectrodes of DSCs. The solar cells with and without light scattering layer were tested in the simulated light of 100 mW/cm2. The DSCs with the light scattering layer generated more current density than the DSCs without scattering layer and the overall light to electric power conversion efficiency of DSCs with the light scattering layer was ~4.00 % compared with 3.25 % efficiency of the DSCs without the scattering layer.
关键词： Dye-sensitized solar cell,Photoelectrode,Light scattering layer,Transmittance,White pigment (R902+),Rutile titanium dioxide
更新于2025-09-23 15:19:57
-
Light soaking effect driven in porphyrin dye-sensitized solar cells using 1D TiO2 nanotube photoanodes
摘要： Light soaking (LS) effect on porphyrin (GD2) dye-sensitized solar cells (DSSCs) using well-ordered TiO2 nanotube (TNT) photoanodes was studied with different lengths of TNTs and LS treatment time. The TNT array possessing longer length and larger tube diameter had improved photoelectrochemical (PEC) property by generating larger photocurrent, and besides provided a larger surface area to yield more dye loading. The LS effect on GD2-applied DSSCs using TNT photoanodes was triggered off in the first 5 min of the LS treatment, and gradually increased during 60 min LS treatment. The improved PEC property and dye loading by longer TNT array (22 μm) led to the noticeable enhancement rate of power conversion efficiency from 0.7% to 1.88% (168 % increase) after 60 min LS treatment, which was more prominent compared to the enhancement of GD2-applied DSSCs using mesoporous TiO2 films. Especially, morphological property of well-ordered 1D TNT photoanodes offers more spaces to facilitate the cation exchange in electrolyte system, leading to enhancing electron injection and reducing recombination under the LS condition. Electrochemical impedance spectroscopy (EIS) results confirmed the contribution of well-aligned 1D TNT structure to significant LS effect in GD2-applied DSSCs.
关键词： anodization,TiO2 nanotube,Photoelectrode,Porphyrin,Light soaking,Dye-sensitized solar cells
更新于2025-09-19 17:13:59
-
Polarizability and Catalytic Activity Determine Good Titanium Oxide Crystals but Not Homogeneity in Solar Cells Using Photocatalysts on Both Electrodes
摘要： TiO2 is advantageous when used on the anode of a solar cell (SC) and achieves an electromotive force of 2 V when using another photocatalyst on the cathode (dual-photoelectrode fuel cell). However, both sufficient photocatalytic activity and electronic conductivity are required for the film, and these two requirements compete with each other. Herein, uniformly sized and shaped spheroidal, cubic, and “rhombic” TiO2 nanoparticles were synthesized, forming films using casting, slide, ball milling–slide (BS), and ball milling–mechanical (BD) methods. The AC/DC impedances of the films followed the order “rhombic”-ball milling–slide > “rhombic”-slide > cubic-slide > spheroidal-ball milling–mechanical > P25-casting ~ P25-slide ~ spheroidal-BS ~ spheroidal-slide ~ P25-ball milling–mechanical, demonstrating that “rhombic” and cubic TiO2 films were unsuitable for use on the SC photoanode. The reverse reaction rates of cathode reaction (water photo-oxidation), i.e., the 18O2 exchange reaction, were evaluated, which followed the order Cubic-TiO2 > Spher-TiO2 > Rhomb-TiO2 ~ P25-TiO2, demonstrating that the synthesized TiO2 was unsuitable for water oxidation. Polarizability and catalytic activity of TiO2 crystals were critical to maximize SC performance, and fluorescence peak intensity at 372–366 nm was well correlated to SC performance. P25-Slide on a photoanode at pH 1.78 and BiOCl-Cast on a photocathode at pH 2.00 enabled a maximum power of 85.2 μW cm?2 and an open-circuit voltage of 1.94 V.
关键词： Water oxidation,Impedance,Solar cell,Dual-photoelectrode fuel cell,TiO2,Photocatalyst,Polarizability,Isotope tracing
更新于2025-09-12 10:27:22
-
Enhanced photoelectrochemical performance of NaNbO3 nanofibers photoanode coupled with visible-light active g-C3N4 nanosheets for water splitting
摘要： Sodium niobate nanofibers (NaNbO3-NF) have been synthesized by hydrothermal technique and further coupled with visible light responsive graphitic carbon nitride (g-C3N4) nanosheets in the different concentration ratio of 2:1 (2-CN), 4:1 (4-CN) and 8:1 (8-CN). A significant improvement in the photoelectrochemical (PEC) performance of g-C3N4/NaNbO3-NF (4-CN) nanostructured photoanode as compared to bare NaNbO3 photoanode is observed. A current density of 12.55 mA cm?2 at 1 V with respect to Ag/AgCl reference electrode is achieved for g-C3N4/NaNbO3-NF (4-CN) photoanode which is ~3 times higher than the NaNbO3-NF photoanode. Also, as compared to NaNbO3-NF, g-C3N4/NaNbO3-NF (4-CN) nanocomposite photoanode showed ~3 times improvement in the incident photon-to-current conversion efficiency. The improvement in the PEC performance of visible light active g-C3N4/NaNbO3-NF (4-CN) nanocomposite is attributed to the improved photoresponse of NaNbO3-NF due to the coupling of g-C3N4 and formation of type-II heterojunction between them leading to the enhanced separation of the photogenerated charge carriers. A possible reaction mechanism for the improved photoelectrochemical water splitting performance has been proposed for g-C3N4/NaNbO3-NF (4-CN) photoanode.
关键词： Photoelectrode,Nanocomposite,Heterojunction,g-C3N4/NaNbO3-NF,PEC Water Splitting
更新于2025-09-12 10:27:22
-
Optimization Algorithms of Neural Networks for Traditional Time-Domain Equalizer in Optical Communications
摘要： Herein we report an e?ective Ru(NH3)6 3+/Ru(NH3)6 2+-mediated photoelectrochemical-chemical-chemical (PECCC) redox cycling ampli?cation (RCA) strategy toward enhanced triple signal ampli?cation for advanced split-type PEC immunoassay application. Speci?cally, alkaline phosphatase (ALP) label was con?ned via a sandwich immunorecognition to convert 4-aminophenyl phosphate to the signal reporter 4-aminophenol (AP), which was then directed to interact with Ru(NH3)6 2+ as a redox mediator and tris (2-carboxyethyl) phosphine (TCEP) as reducing agent in the detection bu?er. Upon illumination, the system was then operated upon the oxidation of Ru(NH3)6 2+ by the photogenerated holes on the Bi2S3/BiVO4 photoelectrode, starting the chain reaction in which the Ru(NH3)6 2+ was regenerated by Ru(NH3)6 3+-enabled oxidization of AP to p-quinoneimine, which was simultaneously recovered by TCEP. Exempli?ed by interleukin-6 (IL-6) as the analyte, the Ru(NH3)6 3+/Ru(NH3)6 2+-mediated, AP-involved PECCC RCA coupled with ALP enzymatic ampli?cation could achieve triple signal ampli?cation toward the ultrasensitive PEC IL-6 immunoassay. This protocol can be extended as a general basis for other numerous targets of interest. Besides, we believe this work could o?er a new perspective for the further exploration of advanced RCA-based PEC bioanalysis.
关键词： photoelectrochemical-chemical-chemical (PECCC) redox cycling ampli?cation (RCA),triple signal ampli?cation,Bi2S3/BiVO4 photoelectrode,Ru(NH3)6 3+/Ru(NH3)6 2+-mediated,PEC immunoassay
更新于2025-09-11 14:15:04
-
Construction of heterojunction photoelectrode via atomic layer deposition of Fe2O3 on Bi2WO6 for highly efficient photoelectrochemical sensing and degradation of tetracycline
摘要： The present paper describes the fabrication of a heterojunction photoelectrode by combining the wet chemical synthesis of Bi2WO6 with the formation of Fe2O3 layer by atomic layer deposition (ALD) technique. Fe2O3 with different atomic thicknesses was layered onto spin-coated Bi2WO6 nanoflakes by controlling the number of deposition cycles. The influence of the thickness of the Fe2O3 layers on photoelectrocatalytic detection and remediation was also studied. The deposition of a 15-nm layer of Fe2O3 on Bi2WO6 led to the best photoelectrochemical response under visible light activation. The performance of 15-nm Fe2O3–Bi2WO6 (4.3 μA/cm2) was 3.6 times higher than that of pristine Bi2WO6 (1.2 μA/cm2) at an external bias of 0.6 V. The enhanced performance was due to the increased spectral breadth of light absorption and efficient transfer of photogenerated charge carriers by the suppression of electron–hole pairs. The optimized photoelectrode detected tetracycline antibiotic in aqueous solution with a 0.3 μM limit of detection and photoelectrocatalytically degraded around 95% tetracycline. The heterojunction photoelectrode structure prepared using ALD enables inexpensive, non-enzymatic, amperometric determination and degradation of tetracycline in a stable and reproducible manner via a deduced mechanism. Our strategy can be used to fabricate photoelectrodes for a wide range of applications.
关键词： Atomic layer deposition,Sensing,Heterojunction photoelectrode,Photoelectrochemical,Fe2O3-Bi2WO6
更新于2025-09-10 09:29:36
-
Photoelectrochemical Gas–Electrolyte–Solid Phase Boundary for Hydrogen Production From Water Vapor
摘要： Hydrogen production from humidity in the ambient air reduces the maintenance costs for sustainable solar-driven water splitting. We report a gas-diffusion porous photoelectrode consisting of tungsten trioxide (WO3) nanoparticles coated with a proton-conducting polymer electrolyte thin film for visible-light-driven photoelectrochemical water vapor splitting. The gas–electrolyte–solid triple phase boundary enhanced not only the incident photon-to-current conversion efficiency (IPCE) of the WO3 photoanode but also the Faraday efficiency (FE) of oxygen evolution in the gas-phase water oxidation process. The IPCE was 7.5% at an applied voltage of 1.2 V under 453 nm blue light irradiation. The FE of hydrogen evolution in the proton exchange membrane photoelectrochemical cell was close to 100%, and the produced hydrogen was separated from the photoanode reaction by the membrane. A comparison of the gas-phase photoelectrochemical reaction with that in liquid-phase aqueous media confirmed the importance of the triple phase boundary for realizing water vapor splitting.
关键词： proton exchange membrane,solar H2 production,tungsten oxide photoanode,visible-light-driven photoelectrode,gas-phase water splitting
更新于2025-09-09 09:28:46
-
CuO photoelectrodes synthesized by the sol–gel method for water splitting
摘要： CuO is an attractive photocatalytic material for water splitting due to its high earth abundance and low cost. In this paper, we report the deposition of CuO thin films by sol–gel dip-coating process. Sol deposition has attractive advantages including low-cost solution processing and uniform film formation over large areas with a fairly good control of the film stoichiometry and thickness. Pure CuO phase was obtained for calcination temperatures higher than 360 °C in air. The CuO photocurrents for hydrogen evolution depend on the crystallinity and the microstructure of the film. Values of ?0.94 mA cm?2 at pH = 8 and 0 V vs. RHE were achieved for CuO photoelectrodes annealed at 400 °C under air. More interestingly, the stability of the photoelectrode was enhanced upon the sol–gel deposition of a TiO2 protective layer. In this all sol–gel CuO/TiO2 photocathode, a photocurrent of ?0.5 mA cm?2 is achieved at pH = 7 and 0 V vs. RHE with a stability of ~100% over 600 s.
关键词： TiO2 protecting layer for CuO photoelectrode,Sol–gel,CuO photoelectrode,Water splitting
更新于2025-09-04 15:30:14