Catalysts
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2022
·Vol. 12
·期 12
·1635
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IF 4.501
Mingjun Wang,Che Li,Bingfang Liu,Wenzhen Qin,Yu Xie
Heterojunction photocatalytic materials show excellent performance in degrading toxic pollutants. This study investigates the influence of calcination temperature on the performances of floral Bi2O3/TiO2composite photocatalyst crystal, which was prepared with glycerol, bismuth nitrate, and titanium tetrachloride as the major raw materials via the solvothermal method. XRD, SEM/TEM, BET, Uv-vis, and XPS were employed to analyze the crystal structure, morphology, specific surface area, band gap, and surface chemical structure of the calcined temperature catalysts. The calcination temperature influence on the catalytic performance of composite photocatalysis was tested with rhodamine B (RhB) as the degradation object. The results revealed the high catalytic activity and higher photocatalytic performance of the Bi2O3/TiO2catalyst. The degradation efficiency of the Bi2O3/TiO2catalyst to RhB was 97%, 100%, and 91% at 400 °C, 450 °C, and 500 °C calcination temperatures, respectively, in which the peak degradation activity appeared at 450 °C. The characterization results show that the appropriate calcination temperature promoted the crystallization of the Bi2O3/TiO2catalyst, increased its specific surface area and the active sites of catalytic reaction, and improved the separation efficiency of electrons and holes.Keywords:calcination temperature;Bi2O3/TiO2compound;visible light;photodegradation
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 9
·5638-5648
·
IF 4.186
Daixiong Zhang,Qing Xiang
Nafion is suggested as an efficient assistant in preparing supercapacitor by employing nanoparticles. In this work, using a bi-additive of 0.10-mM NaOH + 0.10 g L −1 Nafion, Nafion-assisted electrophoretic co-deposition of Bi 2 O 3 –multiwalled carbon nanotubes (MWCNTs) coating is successfully realized in ethanol solvent. The capacitance performances of the electrophoretic coatings in 6.0-M KOH electrolyte are investigated by cyclic voltammetry and galvanostatic charge–discharge techniques. Comparing with Bi 2 O 3 coating prepared with electrophoretic deposition (EPD) by employing other additive (such as polyethyleneimine), the Bi 2 O 3 coating prepared by Nafion-assisted EPD shows a better capacitance performance. Benefiting from the improvement in coating conductivity caused by MWCNTs, with a small additional amount of 4.0 wt.%, the Bi 2 O 3 –MWCNTs coating exhibits an amazing 164% increase of mass-specific capacitance (473 F g −1 at the current density of 1.0 A g −1 ) in comparison with pure Bi 2 O 3 coating (179 F g −1 at the current density of 1.0 A g −1 ). The cyclic stability test exhibits excellent capacitance retention of 88.7% over 3000 cycles at a constant current density of 10.0 A g −1 . This work combines the advantages of MWCNTs, Nafion, and EPD to provide a facile route for preparing Bi 2 O 3 -based coating as a high-performance supercapacitor electrode.
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Coatings
·
2022
·Vol. 12
·期 4
·526
·
IF 3.236
Jiaqi Li,Junjun Wang,Fengmin Wu,Hui Ma,Tianyi Ma,Yu Tian,Danqing Liu,Bin Yang
In this paper, Bi2O3-doped (K0.5Na0.5)NbO3(x = 0.1, 0.2, 0.3, 0.4) lead-free ceramics are prepared by a conventional solid-state reaction and analyzed by studying the structure, ferroelectric, and piezoelectric properties. It is found that the doping of Bi2O3increases the proportion of the trigonal phase in KNN ceramics, thus enabling the construction of KNN ceramics with an orthogonal–trigonal phase boundary at room temperature. At the same time, doping with Bi2O3can reduce the grain size and improve grain size uniformity of the ceramics. The KNN-0.1%Bi2O3ceramic has the best piezoelectric properties in all composition; the results are as follows:d33= 121pC/N,kp= 0.474,kt= 0.306.Keywords:KNN lead-free ceramics;Bi2O3doping;grain effects;piezoelectric property
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yinghua Li,Wenyue Yin,Mengxi Li,Jingwen Zhang,Lijun Chen
Ag/AgCl/Bi 2 O 3 /BiFeO 3 composite photocatalysts were synthesized by a simple co-precipitation and sono-chemical method, and their photocatalytic properties were investigated. The crystal structure, morphology, and elemental composition of the Ag/AgCl/Bi 2 O 3 /BiFeO 3 composite photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy-energy spectroscopy (SEM-EDS), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS). Carrier migration and separation studied by Uv–vis DRS and PL spectroscopy. XPS showed that Ag monomers were successfully reduced out. The photocatalytic activity of the composites was investigated by simulating sunlight (full-spectrum xenon lamp irradiation) irradiation of levofloxacin hydrochloride. The results showed that the composite photocatalyst had the highest photocatalytic activity at pH 8 of the prepared system, pH 7 of the reaction solution and Ag + concentration of 0.1 mol/L (44.3 wt% loading), and still had good photocatalytic activity after five cycles. Compared with Bi 2 O 3 /BiFeO 3 and Ag/AgCl, Ag/AgCl/Bi 2 O 3 /BiFeO 3 exhibited better photocatalytic activity. In addition, based on the radical scavenging experiments and electron spin resonance analysis, ·O 2 - , h + and ∙OH were the reactive groups that played a role in the reaction system, and a possible catalytic mechanism of Ag/AgCl/Bi 2 O 3 /BiFeO 3 was proposed.
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Catalysts
·
2023
·Vol. 13
·期 5
·821
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IF 3.9
Xiaowang Lu,Wenxuan Chen,Haijun Hou,Junchao Qian,Qinfang Zhang
A two-dimensional layered CeO2/Bi2O3composite was synthesized by microwave solvothermal method. X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), UV-Vis diffuse reflection spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS) were used to studied crystal structure, morphology, optical performance, elemental composition and the surface electronic state of the samples. The photocatalytic properties of the prepared samples were evaluated by photocatalytic desulfurization under visible light. When the molar ratio of Ce and Bi was 1:2, CeO2/Bi2O3composite presented the highest photocatalytic desulfurization rate. Transient Photocurrent measurement, electrochemical impedance spectroscopy (EIS) and photoluminescence spectroscopy (PL) showed that CeO2and Bi2O3formed a heterojunction, which could promote the separation of photogenerated electrons and holes, improving the photocatalytic activity. Furthermore, it was found that the active species of hydroxyl radical (·OH) played an important role in the photocatalytic degradation of dibenzothiophene (DBT) based on the active species capture experiment. Finally, a plausible mechanism for the photocatalytic oxidative desulfurization of this nanocomposite was proposed.Keywords:CeO2;Bi2O3;composite;heterojunction;photocatalytic desulfurization
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2026
·
IF 5.7
Muhammad Javed Liaqat,Shahid Hussain,Adil Shafi Ganie,Mohammed Mujahid Alam,Rajesh Kumar Manavalan,Abdullah G. Al-Sehemi,Guanjun Qiao,Guiwu Liu
Environmental monitoring has become essential for recognizing and mitigating the effects of the increased release of hazardous gases on ecosystems and human health. NO 2 is harmful air pollutant, mainly emitted by combustion sources and is associated with respiratory problems and photochemical smog. The present investigation utilized a simple hydrothermal approach to synthesis Bi 2 O 3 /SnO 2 heterostructures designed for the detection of NO 2 gas at low concentrations. The Bi/Sn-2 heterostructure exhibited a remarkable response (R g /R a ) of 105.4 upon exposure to 50 ppm of NO 2 gas. Furthermore, the Bi/Sn-2 heterostructure exhibited significant repeatability in its performance for 8 continuous cycles while ensuring long stability for 30 days. The exceptional responsiveness and selectivity towards NO 2 gas have been attributed to the formation of a p-n junction, augmented by the combined effect of increased surface area and unique morphological characteristics. This study demonstrates a viable approach to develop metal oxides heterojunctions that can detect low concentrations of NO 2 gas.
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ACS Applied Nano Materials
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2025
·
IF 5.5
Yue Guo,Chengyan Liu,Geng Cheng,Huimin Zhou,Ke Zhang,Guodong Yang,Yan Li,Jianhua Zhou,Lei Miao,Dong Hu
Lithium−oxygen batteries (LOBs) are considered promising candidates for next-generation energy storage systems due to their ultrahigh theoretical energy density. However, their practical application is challenged by sluggish reaction kinetics and unstable discharge product formation. Herein, we report the rational nanoscale engineering of a Bi2Se3/Bi2O3 heterostructured cathode via a controlled hydrothermal synthesis, addressing these limitations. The type-I band alignment in nanocomposite Bi2Se3/Bi2O3 generates a built-in electric field at the heterointerface, facilitating electron and ion transport and lowering the energy barriers for oxygen reduction (ORR) and evolution (OER) processes. Consequently, the Bi2Se3/Bi2O3 heterointerface catalyst exhibits exceptional specific capacity (19433.6 mAh g−1) and cycle stability (201 cycles at 200 mA g−1; 98 cycles at 1000 mA g−1), surpassing pristine Bi2Se3 by 320% in cycle life. This study establishes heterointerface engineering as a universal strategy for developing high-performance LOB catalysts.
研究领域:
材料科学
·
能源存储技术
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 46
·期 9
·118214
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IF 6.3
Linhao Li,Yupeng Hao,Zhilun Lu,Ge Wang,Zhiling Hou
Bi 2 O 3 -based ceramics are promising functional materials for electrochemical devices. However, conventional high-temperature sintering (HTS) is energy intensive and can cause interfacial reactions or mechanical failure. In this work, pure Bi 2 O 3 and Er-, Nb-, and Ba-doped compositions were fabricated via the cold sintering process (CSP) at 250 °C. All samples achieved relative densities above 90 %, with pure and Ba-doped ceramics approaching unity. Most compositions remained single-phase after CSP, whereas the Ba-doped ceramic showed slight phase segregation. Analysis of the FTIR and TG–DSC results revealed the CSP mechanism, in which bismuth acetate and oxyacetate form and assist the densification process. CSP ceramics exhibited high oxide ion or electronic conduction that was comparable to their HTS counterparts. The results confirm the feasibility of applying CSP to Bi 2 O 3 -based ceramics, paving the way for the fabrication of advanced composite materials and complex devices.
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Materials
·
2026
·Vol. 19
·期 17
·3771
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IF 3.7
Guodong Liu,Shenghui Lu,Bo Qin,Zhangshun Ruan,Yuhui Wang,Lu Li,Xiaogang Fu,Naiqin Zhao
The Bi/Bi2O3-type oxygen sensor is extensively employed for oxygen monitoring in liquid lead-bismuth eutectic (LBE)-cooled reactors, yet its low-temperature measurement accuracy remains a critical bottleneck limiting engineering deployment. This study aims to extend the lower operating temperature limit of the sensor through synergistic optimization of the reference electrode and solid electrolyte. The effects of the Bi/Bi2O3mass ratio, filling amount, and yttria-partially stabilized zirconia (YPSZ) electrolyte wall thickness on sensor performance were systematically investigated over 300–600 °C. Electrochemical impedance spectroscopy and finite element simulations (COMSOL Multiphysics®6.3, COMSOL Inc., Stockholm, Sweden) were used to elucidate the underlying mechanisms. The results show that the optimized sensor with a Bi/Bi2O3mass ratio of 95:5, a filling amount of 10 g, and a YPSZ wall thickness of 1.5 mm extended the stable operating limit from 350 °C to 300 °C, achieving a relative electromotive force error of 3.13% at 300 °C and maintaining over 4000 h of drift-free service. The improved low-temperature accuracy is attributed to the reduced oxygen ion migration activation energy (0.48 eV) and lower bulk impedance of the thick-walled YPSZ after high-temperature activation. These findings provide a material optimization strategy and theoretical basis for wide-temperature-range, long-lifetime oxygen sensing in lead-based reactors.
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CRYSTAL RESEARCH AND TECHNOLOGY
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2020
·Vol. 55
·期 11
·2000093
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IF 1.169
Hongjun Chen,Zi Wang,Zeyang Xue,Chunhu Yu,Lizhai Pei,Chuangang Fan
A Bi 2 O 3 /In 2 O 3 heterojunction is successfully fabricated via a facile hydrothermal method using sodium bismuthate and indium nitrate as the source materials. The crystal structure, composition, micromorphology, and optical property of the Bi 2 O 3 /In 2 O 3 heterojunction are analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectrum, scanning electron microscopy, transmission electron microscopy, and solid ultraviolet-visible (UV-vis) diffuse reflectance spectra. The Bi 2 O 3 /In 2 O 3 heterojunction exhibits a remarkable photocatalytic degradation capacity for Rhodamine B, which is better than that of pure Bi 2 O 3 and In 2 O 3 . The photogenerated charges separation and transfer process of the Bi 2 O 3 /In 2 O 3 heterojunction follows a direct Z-scheme mechanism under UV–vis light irradiation. The trapping experiment indicates that oxidative radicals including •OH, h + , and •O 2 − play crucial roles in the photodegradation process. The outstanding photodegradation capacity is ascribed to spatially separated charge carriers, fast-charge transportation characteristic, and special bandgap structure of the Bi 2 O 3 /In 2 O 3 heterojunction. The introduction of H + and OH − ions into the reaction system promotes the formation of •OH and •O 2 − radicals, significantly enhancing the photodegradation rate of RhB. This study presents a new insight into the construction of the Z-scheme Bi 2 O 3 /In 2 O 3 heterojunction photocatalyst with potential application in wastewater treatment.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 3
·2100-2110
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IF 2.22
Fan Lele,Liu Zhonghu,Zhu Yiyu,Wang Zhiqiang,Zhao Sihan,Zhu Lei,Zhang Qinfang
In this work, Li x BiO y compounds were synthesized via a facile calcination method. It was surprising that the as-prepared Li 7 BiO 6 compounds transformed into Li-doping tetragonal Bi 2 O 3 phase after undergoing water washing disposal, which was well verified by combining XRD and HR-TEM. In addition, the energy bandgap of prepared compound was derived based on UV–Vis diffuse reflectance spectrum and results indicate the formation of a lower band gap when increasing Li dopant concentration. Moreover, the Li-doping tetragonal Bi 2 O 3 exhibited high visible light-driven photocatalytic activity and the methylene blue can be well degraded in 10 min. The enhanced photocatalytic activity was ascribed to the improvement of light response and charge transfer. Our current work will boost the development of photocatalysis and bring insight into other Li x MO 6 (e.g., Li 6 WO 6 , Li 7 TabO 6 , Li 7 NbO 6 , Li 8 ZrO 6 ) compounds to extend their photocatalytic application.
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RADIATION PHYSICS AND CHEMISTRY
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2023
·
IF 2.9
Wenwen Shan,Baohe Yuan,Yong Zhang
A series of polydopamine (PDA) modified MgO@Bi 2 O 3 composites (MB/PDA) with different mass ratios were fabricated to remove soluble U(VI). Batch experiments showed that MB/PDA-2 was provided with better adsorption performance than MB/PDA-1 and MB/PDA-3 and the maximum adsorption amount (C 0 = 10 mg/L, m/v = 0.1 g/L, pH = 4.0 and T = 298 K) reached 465.8 mg/g within 80 min. Moreover, over 95% U(VI) was removed by MB/PDA-2 in the process of dynamic adsorption and MB/PDA-2 still displayed high adsorption percentage (75%) after five cycles. The electrostatic attraction, complexation, redox reaction and cation-π interaction apparently influenced the U(VI) capture performance on MB/PDA-2. In short, MB/PDA-2 with high adsorption capacity was a preeminent material to extract soluble U(VI).
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