ACS Applied Energy Materials
·
2024
·
IF 5.4
Jiaxin Sun,Shengjie Li,Yitan Li,Xiaohua Zhang,Zhaohui Yang
Supercapacitors have been highly demanded as advanced energy storage devices. A major obstacle is that, compared to commercial battery systems, their energy density is relatively low. Here, we report a flexible asymmetric supercapacitor with high energy and power densities composed of nanostructured MnO2 nanospheres and Bi2O3 nanoshells decorated on a 3D interconnected carbon nanotube sponge (CNTS) in a neutral hydrogel-electrolyte. Our CNTS@MnO2 electrode and CNTS@Bi2O3 electrode demonstrate an excellent areal capacitance of 5.54 F·cm–3 and 4.76 F·cm–3, respectively. In 10,000 charge–discharge cycles, they maintain 93% and 80% of their initial capacitance, respectively. A flexible asymmetric supercapacitor composed of the CNTS@MnO2 anode and the CNTS@Bi2O3 cathode (embedded in a Na2SO4 hydrogel-electrolyte) delivers a high energy density up to 37 Wh·kg–1 at a cell voltage of 1.8 V, 7 times higher than that of traditional electrochemical double-layer capacitors (EDLCs). The long-term cyclic stability and robust mechanical stability profit from the flexible conductive skeleton of CNTS and meet the demands of wearable flexible electronics.
研究领域:
材料科学
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电化学
·
纳米技术
·
能源存储
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高影响因子
JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Jin Tang,Zhili Chen,Xiaolong Yu,Walter Z. Tang
Novel black oxygen deficient bismuth oxide (Bi 2 O 3 -Bi 2 O 3 – x ) photocatalytic material was successfully prepared by a two zone temperature controlled muffle furnace method. The lanthanum , cerium and erbium ions are successfully doped into Bi 2 O 3 -Bi 2 O 3 – x with the average contents of 10.77 wt%, 7.62 wt% and 8.14 wt%, respectively. The results show that a large number of oxygen vacancies exist in Bi 2 O 3 -Bi 2 O 3 – x . La 3+ , Ce 3+ and Er 3+ act as electron acceptors to temporarily trap the photo-generated electrons. The XPS spectrum show Bi-O band in Bi 2 O 3 -Bi 2 O 3 – x and the O 1s peak of Ce/Bi 2 O 3 -Bi 2 O 3 – x move toward the direction of low binding energy. These phenomena fully prove that the separation of photogenerated electron-hole pairs will be more effectual, so as to reduce the possibility of charge carrier recombination. The radical scavenging experiments and electron spin resonance detections confirm that the conduction band of the original Bi 2 O 3 can easily receive photogenerated electrons, while the valence band of the modified Bi 2 O 3 -Bi 2 O 3 – x tends to accept photogenerated holes and then forms the circulation system. Therefore, Ce/Bi 2 O 3 -Bi 2 O 3 – x can degrade tetracycline hydrochloride up to 90.15%. This research provides some new insights into developing green and recyclable photocatalysts for the remediation of antibiotic contamination.
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BIOMATERIALS
·
2018
·
IF 8.806
Hao Huang,Lizhen He,Wenhua Zhou,Guangbo Qu,Jiahong Wang,Na Yang,Jie Gao,Tianfeng Chen,Paul K. Chu,Xue-Feng Yu
X-ray induced photodynamic therapy (X-ray-PDT) is a promising approach for synergistic cancer radiotherapy and development of suitable radiosensitizers is highly desired. In this paper, we propose black phosphorus/Bi 2 O 3 (BP/Bi 2 O 3 ) heterostructures as efficient and biocompatible radiosensitizers for synergistic cancer radiotherapy. The heterostructures are synthesized by growth of ultrasmall Bi 2 O 3 nanoparticles onto BP nanosheets . The Bi 2 O 3 decoration inhibits the rapid degradation of BP nanosheets by occupation of the defect sites , and the synergistic effects of BP and Bi 2 O 3 enable 1 O 2 overproduction under X-ray irradiation. This X-ray-PDT effect of the BP/Bi 2 O 3 nanosheets enhances the radiotherapy activity towards cancer cells by inducing cell apoptosis and cycle arrest. In vivo treatment of melanoma conducted on a clinical radiotherapeutic instrument demonstrates that the BP/Bi 2 O 3 sensitized radiotherapy inhibits tumor growth efficiently. Furthermore, the BP/Bi 2 O 3 nanosheets composed of biological friendly P, O, and Bi elements shows good biocompatibility in vitro and in vivo . This radiosensitizer thus has immense clinical potential for cancer therapy, and our findings reveal a general strategy to fabricate stable BP-based heterostructures for different applications.
研究领域:
癌症治疗
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纳米技术
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放射生物学
·
材料科学
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DOI
PubMed
高影响因子
Nuclear Engineering and Technology
·
2026
·
IF 2.9
Zhengkui Zeng,Di Yan,Rongjia Wang,Isaac Kwasi Baidoo,Yugang Chen,Houhua Xiong,Jifu Du
To address lead-based material toxicity and limited low-energy (70–90 keV) X-ray shielding performance, this study developed a flexible silicone composite using methyl vinyl silicone rubber (VMQ) matrix. A Bi 2 O 3 -SiO 2 filler blend (50:10 wt%) was used to optimize its mechanical properties, which achieved 1.22 MPa tensile strength (about 307% improvement) and 373.5% at elongation break representing about 249% enhancement. The composite demonstrates a high linear attenuation coefficient of 1.7 9 cm -1 for 81 keV γ-rays and 0.375 cm -1 for 356 keV of a 133 Ba source. Thermal gravimetric analysis reveals exceptional stability for the Bi 2 O 3 /SiO 2 /VMQ (50:10:40 wt%) sample, showing 5% weight loss at 519°C and 63.2% residual mass at 800°C. The material combines effective radiation shielding (>99% attenuation at 2.75 cm for 81 keV), flexibility (>350% elongation), non-toxicity, and low density (1.08-1.84 g/cm 3 ) compared to lead (11.3 g/cm 3 ), offering a practical solution for nuclear safety. This research establishes foundational technology for producible, flexible radiation shielding, meeting demands in nuclear and medical applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Nan Wang,Xing Li,Yanling Yang,Yi Shang,Xiaoxuan Zhuang,Hang Li,Zhiwei Zhou
Photocatalysis or coagulation process has been separately studied for the removal of natural organic matter (NOM) from surface water, and the reaction mechanism of organic fractionations of treated effluent has been clarified. Although coagulation-based process has been extensively studied for NOM removal, few attempts have been made based on a combined process that can not only efficiently degrade NOM, but also enhance the coagulation performance. The hypothesis is that a combination of photocatalysis and coagulation process in a single unit might potentially enhance NOM removal efficiency. This is because the nano-photocatalyst can serve as both pre-oxidant and flocculation core. Herein, a combined process of visible light photocatalysis prior to coagulation is conducted, with the transformation efficiency of the organics fractionations revealed. The as-prepared nano-sized photocatalyst consisting of Bi 2 O 3 -TiO 2 (molar Bi/Ti ratio 0.04:1) had a stronger visible light absorption ability. Compared to coagulation alone, the combined photocatalysis-coagulation process greatly improved NOM removal, with synergistic effect, while the pre-photocatalysis reduced the required dosage of polyaluminium chloride (PACl) coagulant and increased the optimal pH of solution. A mathematical model optimized by response surface methodology of the combined process was developed that produced a good correlation between predicted and experimental values. The optimal conditions were calculated as follow: 2.0 g/L photocatalyst, a photocatalytic reaction time of 10 min 18 sec, 0.04 mM PACl coagulant, and a pH of 4.2. These conditions particularly enhanced removal of acidic hydrophobic substance, humic-/protein-like substances and fractions with molecular weight between 3 and 44 kDa. The XRD spectra and SEM images of the produced flocs identified that these flocs consisted of a core of photocatalyst, which could contribute to an effective flocculation and enhanced NOM removal.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Lan Zhou,Maoliang Xie,Hang Su,RunLin Chen,Yuxia Pang,Hongming Lou,Dongjie Yang,Xueqing Qiu
Papermaking wastewater has large output and high chemical oxygen demand (COD), which seriously affects the water environment. As a by-product of papermaking industry, lignin is the main contaminant that causes excessive COD value. Bismuth oxide is a potential catalyst for photocatalytic degradation of lignin-contained wastewater because of its high charge conduction performance and light corrosion resistance . However, the high electron-hole recombination rate and poor surface chemical state of pure Bi 2 O 3 seriously hinder the degradation efficiency. Herein, we designed an O V -Bi 2 O 3 /BiOCOOH heterojunction with oxygen vacancies and heterojunction coexisting for photocatalytic degradation of lignin. Temperature induced the oxidation of ethylene glycol into formic acid , resulting in the epitaxial growth of Bi 2 O 3 and forming a Bi 2 O 3 /BiOCOOH heterojunction. The heterojunction presents a tight interface by sharing the Bi-O tetrahedron, and provides a highway for the charge transfer. Meanwhile, the oxidation of ethylene glycol induces oxygen vacancies (O V s) on Bi 2 O 3 /BiOCOOH surface, forming charge trapping centers to promote electron transport and surface reactions. The degradation efficiency of O V -Bi 2 O 3 /BiOCOOH is approximately 3 and 16 times that of Bi 2 O 3 and BiOCOOH, respectively. The improvement of photocatalytic performance can be attributed to the synergy of heterojunction and oxygen vacancy, and the stability is attributed to covalent bonds tightly connected.
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高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 13
·期 12
·12256-12265
·
IF 1.5
Shanshan Liu,Yansu Wang,Zhiling Ma
The bismuth oxide/reduced graphene oxide (Bi 2 O 3 /rGO) composite was synthesized by solvothermal method at different calcination temperatures. The morphology and phase structure of the Bi 2 O 3 /rGO composite was characterized using thermogravimetric analysis (TGA), X-ray diffraction (XRD), electron microscopy (SEM), and Brunauer-Emmett-Teller (BET). Meanwhile, the electrochemical performance of the Bi 2 O 3 /rGO was obtained on the electrochemical workstation. The calcination temperature directly influenced the transformation of the precursor and the morphology and structure of the material obtained after calcination, which further affected the electrochemical properties of the material. At a calcination temperature of 350°C, Bi 2 O 3 /rGO composite has a good crystallinity, uniform dispersion and excellent electrochemical performance. The composite specific capacitance is 617.1 F·g -1 in 6 M KOH by chronopotentiometry at a specific current of 1 A·g -1 , and the composite also displays a low resistance. These results indicate that Bi 2 O 3 /rGO composite has great prospects for supercapacitor electrode materials.
研究领域:
材料科学
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电化学
·
储能
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高影响因子
Reaction Chemistry & Engineering
·
2026
·
IF 3.1
Tianyuan Xiao,Xinyue Dong,Yong Li,Xiaoya Ding,Guangming Yin
Non-stoichiometric bismuth oxyhalides represent a category of semiconductor photocatalysts with extensive application potential. Herein, Bi2O3, Bi12O17Cl2, and Bi12O17Cl2/β-Bi2O3 microsphere materials were prepared through the calcination. The photocatalytic degradation performance of Bi12O17Cl2/β-Bi2O3 composite microspheres on methylene blue (MB) simulated wastewater under visible light was investigated. The results indicate that the photocatalytic degradation efficiency of MB can reach up to 91.50% in a 10 mg/L solution by Bi12O17Cl2/β-Bi2O3 composite microspheres. The photocatalytic mechanism of Bi12O17Cl2/β-Bi2O3 was explored using free radical trapping experiments, UV-vis DRS, and Nyquist curve analysis, revealing that the material forms a type II heterostructure. This work presents a novel perspective on the design of advanced coupledsemiconductor materials for the degradation of organic pollutants.
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高影响因子
Applied Sciences-Basel
·
2019
·Vol. 9
·期 13
·2653
·
IF 2.217
Xiao-gang Guo
Herein, a novel superhydrophobic functionalized nano-Bi2O3coating is designed and fabricated using electrophoretic assembly deposition (EAD) in the optimal suspension of polyethylene glycol, ethanol, acetylacetone, and surface functionalization. The small size (70 nm, nano-scale) of Bi2O3particles and uniform distribution make the target film possessing a promising structure for realizing hydrophobic functionalization. Moreover, the hydrophobicity and stability results indicate that the product has a high-water contact angle (CA) of ca. 167° and is kept almost stable after 180 days exposure in the natural environment. These findings will provide new insight into a better design of superhydrophobic functional coatings via this facile method, holding great promise for future various applications.
研究领域:
材料科学
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表面化学
·
纳米技术
·
涂层与薄膜
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DOI
高影响因子
RADIATION PHYSICS AND CHEMISTRY
·
2023
·
IF 2.9
Wenjing Liu,Xinrui Zhang,Hongbo Wang,Guorong Yang,Xiaoman Zhao,Jianhan Hong
The flexible X-ray protective materials are commonly made of lead rubber. They have heavy weight, high biological toxicity, poor flexibility and aging resistance. The "weak absorption zone" in the energy range of 40–88 keV threaten environmental safety and human health. Bi 2 O 3 -rubber based flexible X-ray protective materials were prepared by rubber production process. The micromorphology, shore hardness, specific gravity, mechanical properties and radiation protective properties were characterized and analyzed. The results showed that Bi 2 O 3 particles dispersed in natural rubber (R) matrix uniformly. The shore hardness of samples fluctuated between 41° and 46° with the increasing Bi 2 O 3 content, lower than the Level 1 index requirement of the hardness (≤80°) of lead-free composite protective materials. The specific gravity increased from 1.35 g/cm 3 to 2.38 g/cm 3 , which reduced approximately 34% comparing with the commercial protective materials containing Pb. The breaking strength and breaking elongation meet the index requirements in National standard GB 16757-2016. When Bi 2 O 3 content reached 300 parts, the highest lead equivalent and maximum shielding ratio were 0.3012 mmPb and 52.95% respectively. It meets the index requirement of lead equivalent of 0.25 mmPb≤Pb≤0.35 mmPb for the front sheet of protective clothing. The effective shielding range of the protective material R/Bi 2 O 3 (100/300) was mainly in the range of incident energy of 65∼100 keV and 164–250 keV, which covered the “weak absorption zone” of lead.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-14
·
IF 2.8
Guo Yan,Zhang Xinxu,Zhang Rui,Li Aiyuan,Zhang Jiawen,He Hui
In this work, Bi 2 O 3 and Bi 2 S 3 nanomaterials are modified with polyvinylpyrrolidone (PVP). The products are defined as Bi 2 O 3 @PVP and Bi 2 S 3 @PVP, respectively. SEM demonstrates that the addition of PVP helps to reduce the size of Bi 2 O 3 and Bi 2 S 3 nanomaterials. XRD exhibits that the structure of Bi 2 O 3 changed from α-Bi 2 O 3 to β-Bi 2 O 3 @PVP due to the addition of PVP, while the Bi 2 S 3 configuration remained unchanged. XPS demonstrates that excess PVP leads to a partial reduction of trivalent Bi 3+ to metallic Bi 0 . Their supercapacitive performances are tested and it is found that appropriate PVP can improve the capacitive performance and cyclic stability of both Bi 2 O 3 and Bi 2 S 3 . The specific capacitance of Bi 2 O 3 @1 g PVP is 1.4 times that of the pristine Bi 2 O 3 , and the specific capacitance of Bi 2 S 3 @1 g PVP is 1.8 times that of the pristine Bi 2 S 3 . Compared with 82.0% Bi 2 O 3 and 79.6% Bi 2 S 3 , the cyclic retention is 94.7% and 95.2% for Bi 2 O 3 @1 g PVP and Bi 2 S 3 @1 g PVP after 10,000 cycles. The reason for enhancement is that PVP can support Bi 2 O 3 and Bi 2 S 3 materials, not only to support their structural stability but also to reduce their size and facilitate electron transfer and ion diffusion.
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高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Zhifang Feng,Bona Zhang,Peijun Ji,Ruiyuan Hu,Bin Gao,Xiaofeng Wang,Yu-Lan Meng,Xue-Zhi Song,Zhenquan Tan
Bi2O3 is increasingly used in supercapacitors because of its high theoretical specific capacitance, but poor inherent conductivity and poor ion diffusion limit its actual capacitance. Therefore, the rational design of the surface and structure of Bi2O3 is the key to improve the specific capacitance of Bi2O3. Here, we report the fabrication of high-performance negative electrodes from Bi2O2CO3 nanosheets wrapped around Bi2O3 arrays (Cu foam@Bi2O3@Bi2O2CO3) by a combination of electrical substitution, oxidative calcination, and hydrothermal methods. The realized Cu foam@Bi2O3@Bi2O2CO3 presents a surface cross-linked laminar structure, which shortens the electrolyte penetration path. The direct replacement growth of Bi on copper substrates to obtain subsequent composites allows for enhanced adhesion between the electrode material and the collector, facilitates charge transfer to the electrode material, and achieves ultrahigh loadings (13.2 mg cm–2). In addition, the constructed asymmetric supercapacitor has a maximum energy density of 1.6 mW h cm–2 (45.5 W h kg–1) at a power density of 6.2 mW cm–2 (175.9 W kg–1). This work provides a simple design strategy to enhance the electrochemical performance of Bi2O3.
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高影响因子
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