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Significant Enhancement of Hydrogen-Sensing Properties of ZnO Nanofibers through NiO Loading
摘要： Metal oxide p-n heterojunction nano?bers (NFs) are among the most promising approaches to enhancing the ef?ciency of gas sensors. In this paper, we report the preparation of a series of p-NiO-loaded n-ZnO NFs, namely (1?x)ZnO-xNiO (x = 0.03, 0.05, 0.7, 0.1, and 0.15 wt%), for hydrogen gas sensing experiments. Samples were prepared through the electrospinning technique followed by a calcination process. The sensing experiments showed that the sample with 0.05 wt% NiO loading resulted in the highest sensing performance at an optimal sensing temperature of 200 ?C. The sensing mechanism is discussed in detail and contributions of the p-n heterojunctions, metallization of ZnO and catalytic effect of NiO on the sensing enhancements of an optimized gas sensor are analyzed. This study demonstrates the possibility of fabricating high-performance H2 sensors through the optimization of p-type metal oxide loading on the surfaces of n-type metal oxides.
关键词： ZnO,NiO loading,sensing mechanism,gas sensor,nano?ber,p-n heterojunction
更新于2025-09-09 09:28:46
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Construction of Ternary rGO/Ag <sub/>2</sub> CO <sub/>3</sub> /AgBr Heterostructured Photocatalyst for Improved Photocatalytic Activity and Stability
摘要： Novel ternary rGO/Ag2CO3/AgBr heterostructured photocatalyst have been successfully fabricated through in-situ anion exchange synthesis route. The morphology, crystal structure, component and optical property of the as-obtained products were fully characterized by various technologies. The photocatalytic performances of the as-obtained products were measured by degrading rhodamine B (RhB) under visible light irradiation. The rGO/Ag2CO3/AgBr heterostructured photocatalyst exhibits higher photocatalytic activity than that of the pure Ag2CO3 and rGO/Ag2CO3, indicating the presence of a synergic effect between three components. The superior photocatalytical activity for the rGO/Ag2CO3/AgBr heterostructured photocatalyst is due to the formation of multi-heterojunction with rGO acting as electron mediation, which facilitate the separation of photogenerated electron and hole pairs. The possible transfer path of photogenerated carriers and mechanism for the improved photocatalytic activity are also supposed.
关键词： AgBr,Ternary Heterojunction,Ag2CO3,Photocatalysis,Visible Light Driven
更新于2025-09-09 09:28:46
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Systematic Optimation of Promoters in Trace SnS2 Coating SnO2 Nano-Heterostructure for High Performance Cr(VI) Photoreduction
摘要： Constructing heterojunction semiconductor materials with a strong interfacial interaction are emerging as a forefront material with excellent photocatalytic performance. Herein, we report a novel SnS2/SnO2 heterojunction material via in-situ trace vulcanization strategy to coating SnS2 on the SnO2. The thickness of the coating layer can be regulated by controlling the content of SnS2. Moreover, The molar ratio of S to Sn, particle size of SnO2 precursor and vulcanization time associated with the SnS2 content of heterojunction catalyst were controlled to optimize photocatalytic performance. SnS2/SnO2 heterojunction catalyst with 19.5% SnS2 content delivered a ultrahigh visible-light activity in Cr(VI) degradation, remarkably superior to the inert SnO2 precursors and full-vulcanized SnS2 under identical testing conditions. Amazingly, the enhanced interfacial interaction can remarkably enhance the separation and transfer of photogenerated charges. The systematic methodology of interface regulation in SnS2/SnO2 system is first reported in this work, which would promote the understanding of nano-heterojunction material for high-performance water treatment application.
关键词： Interfacial Interaction,Photovoltage,Photocatalyst,Nano-heterojunction,In-situ Vulcanization
更新于2025-09-09 09:28:46
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Molecularly imprinted photoelectrochemical sensor for fumonisin B1 based on GO-CdS heterojunction
摘要： A rapid and ultrasensitive molecularly imprinted photoelectrochemical (MIP-PEC) sensing platform based on ITO electrode modified with GO-CdS heterojunction was prepared for ultrasensitive measure of fumonisin B1 (FB1). CdS quantum dots (QDs) were combined with a suitable amount of graphene oxide (GO) to form a heterojunction to enhance signal response with accurately calculating energy levels (VB/CB or HOMO/LUMO). The MIP-PEC sensor was successful fabricated after MIP was immobilized on the electrode with the basis of these results. In the phosphate buffer solution (PBS), it was clearly observed that the non-elution MIP-PEC sensor had almost no photocurrent response, which was due to the slower electron transfer speed. When the MIP-PEC sensor is eluted in ethanol, its photocurrent response was significantly restored, that was because the fact that the template molecules were washed away, and electron donors entered the holes and accelerated the electron transfer. Its photocurrent response was reduced because of holes blocked when the MIP-PEC sensor was hatched in the template molecules culture fluid. This phenomenon fully showed that the MIP-PEC sensor can specifically detect the target. Thus, The work has a linear range from 0.01 to 1000 ng mL?1 with a detection limit of 4.7 pg mL?1 for FB1. Furthermore, the fabricated MIP-PEC sensor will confirm the actual application.
关键词： Photoelectrochemical sensor,Molecularly imprinted polymer,fumonisin B1,GO-CdS heterojunction
更新于2025-09-09 09:28:46
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A synergistic heterostructured ZnO/BaTiO3 loaded carbon photoanode in photocatalytic fuel cell for degradation of Reactive Red 120 and electricity generation
摘要： Photocatalytic fuel cell (PFC) is considered as a sustainable green technology which could degrade organic pollutant and generate electricity simultaneously. A synergistic double-sided ZnO/BaTiO3 loaded carbon plate heterojunction photoanode was fabricated in different ratios by using simple ultrasonication and mixed-annealed method. The double-sided design of photoanode allowed the lights irradiated at both sides of the photoanode. The ferroelectricity fabricated photoanode was applied in a membraneless PFC with platinum-loaded carbon as the cathode. Results revealed that the photoanode with 1:1 ratio of BaTiO3 and ZnO exhibited a superior photocatalytic activity among all the photoanodes prepared in this study. The heterojunction of this photoanode was able to achieve up to a removal efficiency of 93.67 % with a maximum power density of 0.5284 μW cm-2 in 10 mg L-1 of Reactive Red 120 (RR120) without any supporting electrolyte. This photoanode was able to maintain at high performance after recycling 3 times. Over loading of ZnO above 50% on BaTiO3 could lead to deterioration of the performance of PFC due to the charge defects and light trapping ability. The interactions, interesting polarizations of the photocatalysts and proposed mechanism of the n-n type heterojunction in the photoanode of ZnO/BaTiO3 was also discussed.
关键词： Photocatalytic fuel cell,Degradation,Reusability,ZnO/BaTiO3 heterojunction,Electricity Generation
更新于2025-09-09 09:28:46
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Degradation study of malachite green on chitosan films containing heterojunctions of melon/TiO2 absorbing visible-light in solid-gas interfaces
摘要： Urea modified TiO2 nanoparticles were synthesized at different TiO2: urea ratios (10, 30 and 60 (%wt) named UTiO2-10, 30 and 60) by sol-gel method and annealing at 400 °C during 1h. Characterization revealed the presence of TiO2 nanoparticles with visible light absorption (between 400 and 500 nm) probably due by the formation of thermolysis urea byproducts such as melon, which may induce a TiO2/melon heterojunction. Then, modified nanoparticles were immobilized on chitosan films by adding 30% (70QS/30UTiO2) and 50% 50QS/50UTiO2) of UTiO2 nanoparticles. Functionalized films were characterized by SEM-EDS, DRS and AFM. Photo-induced degradation of malachite green stains was evaluated on these films under different wavelengths. Upon UV-A+visible light irradiation, films showed good activity even slightly better than those containing Evonik P-25 (70QS/30P-25). Upon visible light between 450 and 800 nm, films evidenced a satisfactory performance but slower than under UV-A+visible light irradiation whereas the photobleaching activity of 70QS/30P-25 was very poor. When visible light irradiation with wavelengths higher than 590 nm was used, a slight photobleaching was also observed. DRS spectra taken at different irradiation times showed that dye underwent N-demethylated oxidative reactions either upon UV-Visible or visible light irradiation. ATR-FTIR measurements revealed the generation of benzophenones after 6 h of irradiation probably suggesting the formation of singlet oxygen under visible light. 70QS/30UTiO2-10 films showed a good photo-bleaching activity after 18 h of continuous UV-A+visible light irradiation.
关键词： urea,Visible-light responsive TiO2,chitosan films,melon/TiO2 heterojunction
更新于2025-09-09 09:28:46
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Ambipolar charge transport in an organic/inorganic van der Waals p–n heterojunction
摘要： Hybrid two-dimensional (2D) van der Waals (vdW) p–n junctions are attractive due to the controlled synthesis of the physical performances of organic semiconductors and quantum confinement effects of 2D materials, enabling highly tunable optoelectronic performances as well as low-cost processability. Here, hybrid 2D heterostructures are fabricated using a p-type semiconducting polymer (PDVT-10) and n-type MoS2. An ultra-thin film (B9 nm) of the PDVT-10 polymer is formed using the Langmuir–Schaefer (LS) technique. Large-scale MoS2 monolayers are prepared using a chemical vapor deposition (CVD) method. The PDVT-10/MoS2 vertical heterojunction devices show ambipolar charge transport properties with a p-type maximum field-effect mobility of 0.3 cm2 V(cid:2)1 s(cid:2)1 and an n-type maximum field-effect mobility of 2.45 cm2 V(cid:2)1 s(cid:2)1. In addition, the heterojunctions exhibit a great photoresponse under white light as well as a clear rectifying behavior.
关键词： PDVT-10,p–n heterojunction,organic/inorganic,van der Waals,ambipolar charge transport,MoS2
更新于2025-09-09 09:28:46
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Electronic structure of ZnO(0001)/AgBr(111) heterojunction interface based on the TB-mBJ approximation
摘要： In this paper, we investigate the electronic structure of the ZnO and the AgBr semiconductors, in bulk and thin slab structures and in ZnO(0001)/AgBr(111) heterojunction interface, based on full-potential density functional theory and using the Tran and Blaha modified Beck Johnson potential. We obtain energy band gaps in excellent agreement with experiments. By analyzing the surface and interface states, it is found out that there is a wide two-dimensional n-type s-band at the surface of the nano-structures which grabs electrons from the bulk valence p–d band. The build-up potential at the interface is also determined which is 2.3 eV, higher at the AgBr side.
关键词： heterojunction,AgBr,electronic structure,ZnO,TB-mBJ approximation
更新于2025-09-09 09:28:46
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Sb <sub/>2</sub> O <sub/>3</sub> /Sb <sub/>2</sub> S <sub/>3</sub> Heterojunction Composite Thin Film Photoanode Prepared via Chemical Bath Deposition and Post-Sulfidation
摘要： Novel visible-light-driven Sb2O3/Sb2S3 photoelectrodes were synthesized via chemical bath deposition and post-sul?dation. An enhanced photocurrent density of 0.35 mA/cm2 at 1.23 V vs. RHE under simulated sunlight was achieved, compared to 0.008 mA/cm2 at 1.23 V vs. RHE for pure Sb2O3. The great improvement in the photoelectrochemical (PEC) performance bene?ts from the enhanced light absorbance and charge transfer ef?ciency attributable to the combination of Sb2S3. The Sb2O3/Sb2S3 heterojunction strategy shows potential for visible-light-driven photoelectrochemical water splitting.
关键词： heterojunction,photoelectrochemical,Sb2O3/Sb2S3,visible-light-driven,water splitting
更新于2025-09-09 09:28:46
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Fabrication of SnS <sub/>2</sub> /SnS Heterojunction with Enhanced Light-Assisted Electrochemical Water Splitting Performance
摘要： Semiconducting metal sul?des have raised strong research interest among researchers as a promising candidate for light-assisted electrochemical water splitting, because they have wide band gap. In order to harvest more light wavelengths for improvement of light-assisted electrochemical water splitting capacity, we fabricated SnS2/SnS heterojunction nanosheets via facile and environmental route. The SnS2/SnS heterojunction nanosheets were used as photo-electrocatalytic material which exhibited low over potential of ?0.64 V at the current density of 10 mA · cm?2 in 0.5 M NaSO4 solution. Moreover, the SnS and SnS2 nanosheets displayed high over potential values of ?0.80 and ?0.88 V at the current density of 10 mA · cm?2, respectively. This research ?nding may therefore show the potential for use of SnS2/SnS heterojunction nanosheets as low cost and environmentally friendly photo-electrocatalysis.
关键词： SnS2/SnS Heterojunction,SnS2 Nanosheet,SnS Nanosheet,Light-Assisted Electrochemical Water Splitting
更新于2025-09-04 15:30:14