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Highly Efficient Photoelectrochemical Water Splitting: Surface Modification of Cobalt-Phosphate-Loaded Co <sub/>3</sub> O <sub/>4</sub> /Fe <sub/>2</sub> O <sub/>3</sub> p-n Heterojunction Nanorod Arrays
摘要： Hematite (α-Fe2O3) as a photoanode material for photoelectrochemical (PEC) water splitting suffers from the two problems of poor charge separation and slow water oxidation kinetics. The construction of p–n junction nanostructures by coupling of highly stable Co3O4 in aqueous alkaline environment to Fe2O3 nanorod arrays with delicate energy band positions may be a challenging strategy for efficient PEC water oxidation. It is demonstrated that the designed p-Co3O4/n-Fe2O3 junction exhibits superior photocurrent density, fast water oxidation kinetics, and remarkable charge injection and bulk separation efficiency (ηinj and ηsep), attributing to the high catalytic behavior of Co3O4 for the oxygen evolution reaction as well as the induced interfacial electric field that facilitates separation and transportation of charge carriers. In addition, a cocatalyst of cobalt phosphate (Co-Pi) is introduced, which brings the PEC performance to a high level. The resultant Co-Pi/Co3O4/Ti:Fe2O3 photoanode shows a photocurrent density of 2.7 mA cm?2 at 1.23 VRHE (V vs reversible hydrogen electrode), 125% higher than that of the Ti:Fe2O3 photoanode. The optimized ηinj and ηsep of 91.6 and 23.0% at 1.23 VRHE are achieved on Co-Pi/Co3O4/Ti:Fe2O3, respectively, corresponding to the 70 and 43% improvements compared with those of Ti:Fe2O3. Furthermore, Co-Pi/Co3O4/Ti:Fe2O3 shows a low onset potential of 0.64 VRHE and long-time PEC stability.
关键词： photoanode,Co3O4,Fe2O3,p–n heterojunctions,Co-Pi
更新于2025-09-19 17:15:36
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Enhanced PEC performance of hematite photoanode coupled with bimetallic oxyhydroxide NiFeOOH through a simple electroless method
摘要： The oxygen evolution reaction (OER) is one important bottleneck in the development of economical photoelectrodes. Herein, we firstly prepared bimetallic oxyhydroxide NiFeOOH layer on Fe2O3 photoanode through a simple electroless ligand-regulated oxidation method in order to build highly-matched semiconductor/cocatalyst interface. Benefited from the accelerated OER kinetics and low overpotential of bimetallic oxyhydroxide NiFeOOH, the resultant Fe2O3/NiFeOOH core-shell with strongly-bound heterojunction interface possesses better visible light absorption, enhanced photocurrent density (1.83 mA/cm2 at 1.23 VRHE) and good stability than bare Fe2O3 and semi-FeOOH and NiOOH decorated Fe2O3 photoanodes. We believe this work provides a new pathway for designing high-quality contact interface of various photoelectrode/catalyst.
关键词： electroless ligand-regulated oxidation,photoelectrochemical water splitting,Fe2O3,core-shell nanorod arrays,NiFeOOH
更新于2025-09-12 10:27:22
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Selective Laser Melting Titanium with nanonet topography inhibits osteoclast differentiation through MAPK signaling pathway
摘要： Penetrating into the inner surface of porous metal-oxide nanostructures to encapsulate the conductive layer is an efficient but challenging route to exploit high-performance lithium-ion battery electrodes. Furthermore, if the bonding force on the interface between the core and shell was enhanced, the structure and cyclic performance of the electrodes will be greatly improved. Here, vertically aligned interpenetrating encapsulation composite nanoframeworks were assembled from Cl?/SO3 2?-codoped poly(3,4-ethylenedioxythiophene) (PEDOT) that interpenetrated and coated on porous Fe2O3 nanoframeworks (PEDOT-IE-Fe2O3) via a one-step Fe3+-induced in situ growth strategy. Compared with conventional wrapped structures and methods, the special PEDOT-IE-Fe2O3 encapsulation structure has many advantages. First, the codoped PEDOT shell ensures a high conductive network in the composites (100.6 S cm?1) and provides interpenetrating fast ion/electron transport pathways on the inner and outer surface of a single composite unit. Additionally, the pores inside offer void space to buffer the volume expansion of the nanoscale frameworks in cycling processes. In particular, the formation of Fe?S bonds on the organic?inorganic interface (between PEDOT shell and Fe2O3 core) enhances the structural stability and further extends the cell cycle life. The PEDOT-IE-Fe2O3 was applied as lithium-ion battery anodes, which exhibit excellent lithium storage capability and cycling stability. The capacity was as high as 1096 mA h g?1 at 0.05 A g?1, excellent rate capability, and a long and stable cycle process with a capacity retention of 89% (791 mA h g?1) after 1000 cycles (2 A g?1). We demonstrate a novel interpenetrating encapsulation structure to highly enhance the electrochemical performance of metal-oxide nanostructures, especially the cycling stability, and provide new insights for designing electrochemical energy storage materials.
关键词： porous Fe2O3,lithium-ion battery,PEDOT,organic?inorganic interface,interpenetrating encapsulation
更新于2025-09-11 14:15:04
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Carbon‐Intercalated 0D/2D Hybrid of Hematite Quantum Dots/Graphitic Carbon Nitride Nanosheets as Superior Catalyst for Advanced Oxidation
摘要： Efficient charge separation and sufficiently exposed active sites are important for light-driving Fenton catalysts. 0D/2D hybrids, especially quantum dots (QDs)/nanosheets (NSs), offer a better opportunity for improving photo-Fenton activity due to their high charge mobility and more catalytic sites, which is highly desirable but remains a great challenge. Herein, a 0D hematite quantum dots/2D ultrathin g-C3N4 nanosheets hybrid (Fe2O3 QDs/g-C3N4 NS) is developed via a facile chemical reaction and subsequent low-temperature calcination. As expected, the specially designed 0D/2D structure shows remarkable catalytic performance toward the removal of p-nitrophenol. By virtue of large surface area, adequate active sites, and strong interfacial coupling, the 0D Fe2O3 QDs/2D g-C3N4 nanosheets establish efficient charge transport paths by local in-plane carbon species, expediting the separation and transfer of electron/hole pairs. Simultaneously, highly efficient charge mobility can lead to continuous and fast Fe(III)/Fe(II) conversion, promoting a cooperative effect between the photocatalysis and chemical activation of H2O2. The developed carbon-intercalated 0D/2D hybrid provides a new insight in developing heterogeneous catalysis for a large variety of photoelectronic applications, not limited in photo-Fenton catalysis.
关键词： Fe2O3 QDs,g-C3N4 NS,charge separation,carbon-intercalated 0D/2D hybrid,Fe(III)/Fe(II) conversion
更新于2025-09-11 14:15:04
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Solid-state synthesis and characterization of α-Fe2O3@ZnO nanocomposites with enhanced visible light driven photocatalytic activity
摘要： The α-Fe2O3@ZnOx (x = 25, 50 and 75 mol%) nanocomposites were synthesized by solid-state method. The formation of nanocomposites was confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy and UV–Visible absorption spectroscopy. High purity of α-Fe2O3 and ZnO was observed in XRD patterns including lesser amount of ZnFe2O4. The growth of ZnO nanostructures on Fe2O3 rods was affirmed by scanning and transmission electron microscopy. Visible light driven photocatalytic degradation of roxarsone (ROX) was performed by using as-synthesized nanocomposites. The photocatalytic experiments were monitored by high pressure liquid chromatography. The α-Fe2O3@ZnO50% shows 89.7% of ROX degradation efficiency within 330 min and thus it exhibits best photocatalytic activity than the other composites. Moreover, the stability and possible photocatalytic pathway were also evaluated.
关键词： Solid-state synthesis,Nanocomposites,α-Fe2O3@ZnO,Photocatalytic activity,Roxarsone
更新于2025-09-10 09:29:36
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Effects of platinum photodeposition time on the photoelectrochemical properties of Fe2O3 nanotube electrodes
摘要： A photo-assisted deposition method for the deposition of platinum nanoparticles on Fe2O3 nanotubes (Pt/Fe2O3), prepared by anodizing, has been developed. The chemicophysical properties and elemental composition of the synthetic Pt/Fe2O3 samples have also been determined. The investigation of the photoelectrochemical properties of the prepared Pt/Fe2O3 samples showed their greatly increased photocurrent density for photoelectrochemical (PEC) water splitting compared to bare Fe2O3. Therefore, the deposition of Pt is effective on the enhancement of the PEC response. In addition, the effect of the Pt photodeposition time on water splitting capability was studied. The current density produced by sample HPt3 was 220 lA/cm2 at +0.4 V vs. Ag/AgCl, which is 2 times higher than that of the bare Fe2O3 nanotube samples (105 lA/cm2, at +0.4 V vs. Ag/AgCl).
关键词： Platinum,Fe2O3 nanotube,Deposition,Thin films,Photoelectrochemical
更新于2025-09-10 09:29:36
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High performance acetone sensor based on γ-Fe<sub>2</sub>O<sub>3</sub>/Al-ZnO nanocomposites
摘要： Ternary nanocomposites made of γ-iron oxide and aluminium-doped zinc oxide (γ-Fe2O3/Al-ZnO NCs), with different metal oxides ratio (0-100%) were prepared through a solvothermal sol-gel process. The synthesized γ-Fe2O3/Al-ZnO NCs were employed to prepare conductometric gas sensors, then their sensing performances toward acetone were also investigated. Results revealed enhanced sensing performance of nanocomposites than both pure γ-Fe2O3 and Al-ZnO phases. In particular, the γ-Fe2O3(33%)/Al-ZnO based gas sensor showed the best sensing properties, like a high response of Rair/Rgas = 29, a short response time of 3 s, in addition to an improved selectivity toward acetone vs. ethanol at an operating temperature of 200 °C. Overall, ternary γ-Fe2O3/Al-ZnO NCs appear to be promising for the development of conductometric acetone sensors.
关键词： Nanocomposite,Iron oxide,Aluminium doped zinc oxide,γ-Fe2O3,Al-ZnO,Acetone,Gas sensor
更新于2025-09-10 09:29:36
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Nanotechnology in Water and Wastewater Treatment || Application of Semiconductor Nanoparticles for Removal of Organic Pollutants or Dyes From Wastewater
摘要： Increasing demand and shortage of pure water sources due to the rapid development of industrialization, population growth and long-term droughts have become an issue world-wide. Industrial growth produces a great variety of organic products and frequently these substances are complex to degrade. Industrial wastewater contains various chemicals especially synthetic dyes. Example, Textile industry generate large amount of wastewater derived to different processes of color impregnation in textile fibers, which has a great amount of detergents, dyes, microfiber (cellulose, wool, and synthetic fibers), and inorganic salts. This residual water, with great load pollutants, generates the contaminations of natural waters bodies. Now a day, more than 50% of dyes used in the textile industry are monoazo, diazo, and triazo dyes, considering their chemical stability (recalcitrant) and negative influence on the ecological systems, the regulations of the removal color in the factory effluent is a current issue of discussion all over the world. The presence of even very low concentrations of dyes in effluent is highly visible and degradation products of these textile dyes are often carcinogenic. These effluent wastewaters have been recognized to have high color, high BOD and COD load, as well as high dissolve organic matter (DOM) concentration. Dyes are aromatic compounds which can absorb light in the visible wavelengths range (400–700 nm). The dye molecule is a combination of a chromophore which is a part of the molecule that can absorb light, that is, the color-absorbing coordination group and a conjugated system, and a structure with alternating double and single bonds. Chromophores are containing C=C and C=O (carbonyl), and azo group -N=N- or nitro group (-NO2). A complex mixture containing various organic materials, including carbohydrates or polysaccharides, amino acids or peptides or proteins, lipids, humic substances, and anthropogenic organic pollutants is known as Dissolved organic matter (DOM). It plays critical roles both in drinking water (DWTPs) and wastewater treatment plants (WWTPs) in determining the treatment performance and the distributed water quality and it is found in everywhere. The presence of DOM not only affects the current discharge standards, but also presents significant challenges in wastewater restoration.
关键词： Wastewater,ZnO,Dyes,Fe2O3,Photocatalysis,Semiconductor Nanoparticles,Organic Pollutants,TiO2
更新于2025-09-10 09:29:36
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Enhanced photocathodic protection performance of Fe2O3/TiO2 heterojunction for carbon steel under simulated solar light
摘要： Titanium dioxide nano array (TNAs) was successfully modi?ed with Fe2O3 (FTNAs) to enhance the photocathodic protection performance for carbon steel. Fe2O3 as a sensitizer captures large quantities of light photons, resulting in a strong light harvest capability of FTNAs. Meanwhile, the bandgap of FTNAs decreased to 2.26 eV, and the photo-generated current densities were 90 and 400 mA cm?2 for TNAs and FTNAs under simulated solar light illumination, respectively. The narrowed bandgap and the sensitive photoelectric response together contribute to a good photocathodic protection performance of FTNAs, which was con?rmed by the electrochemical impedance spectroscopy and electrochemical noise.
关键词： Photocathodic protection,Titanium,Electrochemistry,Carbon steel,Fe2O3
更新于2025-09-10 09:29:36
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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