APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Ao Chen Wang,Shi Kun Wang,Bo Jian Zhou,Jun Di Cheng,Qian Yu Liu,Jiang Long Pan,Yi Qiao,Yan Chun Wang,Geng Zhi Sun,Zhen Xing Zhang,Xiu Ping Gao,Xiao Jun Pan,Jin Yuan Zhou
Heterojunctions are often introduced into gas sensor electrodes due to they can lower the working temperature and increase response rate during gas-sensing detection. However, many reported core–shell structured heterojunctions show a bad synergistic enhancement effect from both components. Here, a type of side-by-side bi-component heterojunction nanofibers of NiO/In 2 O 3 (INO SBHNFs) was designed by the self-made V-channel electrospinning technique. Results showed that these SBHNFs are comprised of two component NFs that attach together side-by-side with a well-defined interface. And the sensors based on INO-10 SBHNFs show the highest response of 210 to 100 ppm ethanol at 260 °C, which is an order of magnitude higher than all those of the ones based on the In 2 O 3 and INO-10-C NFs. Moreover, the INO-10 SBHNF sensors also show a high response recovery rate (4 s/36 s) and a low limit of detection (<200 ppb). Further analysis indicates that this side-by-side design can totally utilize the heterojunctions’ motivation and the solid solution’s enhancement on the formation of depletion layer (including the transfer of electrons), and the synergistic enhancement effect from both components and their surface. Besides, the sensors based on INO SBHNFs also show a good selectivity, as well as a high long-term stability.
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Small
·
2021
·Vol. 17
·期 45
·2102078
·
IF 13.281
Pengsong Li,Xinxuan Duan,Yun Kuang,Xiaoming Sun
Electrocatalytic water splitting in acidic media is a promising strategy for grid scale production of hydrogen using renewable energy, but challenges still exist in the development of advanced catalysts with both high activity and stability. Herein, it is reported that iridium doped tungsten trioxide (Ir-doped WO 3 ) with arrayed structure and confined Ir sites is an efficient and durable bi-functional catalyst for overall acidic water splitting. A low overpotential (258 mV) is required to achieve an oxygen evolution reaction current density of 10 mA cm −2 in 0.5 m H 2 SO 4 solution. Meanwhile, Ir-doped WO 3 processes a similar intrinsic activity to Pt/C toward hydrogen evolution reaction. Overall water splitting using the bi-functional Ir-doped WO 3 catalyst shows low cell voltages of 1.56 and 1.68 V to drive the current densities of 10 and 100 mA cm −2 , respectively, with only 16 mV decay observed after 60 h continuous electrolysis under the current density of 100 mA cm −2 . Structural analysis and density functional theory calculation indicate that the adjusted coordination environment of Ir within the crystalline matrix of WO 3 contributes to the high activity and durability.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Lingsong Wang,Huanshun Yin,Suo Wang,Jun Wang,Shiyun Ai
Bi/BiOCl/Bi 2 O 2 CO 3 heterojunction was prepared via one-step hydrothermal process under the synergistic catalysis of Ni 2+ , where Bi(NO 3 ) 3 was employed as Bi source, DMF was used as carbon source and reductant, NiCl 2 was adopted as Cl source and co-catalyst. The content of Bi, BiOCl and Bi 2 O 2 CO 3 can be adjusted by changing the reaction time, temperature, content of DMF and NiCl 2 . The doping of Bi enhanced the photocatalytic activity of BiOCl/Bi 2 O 2 CO 3 under visible-light. Bi/BiOCl/Bi 2 O 2 CO 3 presented photo-degradation activity for environmental pollutants of rhodamine B, sunset yellow and tetracycline, which were 13.01, 9.40, 1.50 times and 168.38, 10.90, 4.75 times higher than BiOCl and Bi 2 O 2 CO 3 , respectively. The improved photocatalytic activity was ascribed to the sensitized effect of Bi and BiOCl, the surface plasmon resonance effect and the heterojunction structure, which inhibited the recombination of photogenerated electron-hole pairs. The degradation mechanism for rhodamine B was discussed, and the decreased toxicity of the degradation products was demonstrated.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Jialu Huang,Chengwei Deng,Yue Liu,Tingting Han,Feng Ji,Yuehua Zhang,Hongbin Lu,Ping Hua,Bowei Zhang,Tao Qian,Xiaolei Yuan,Yaoyue Yang,Yong Yao
Palladium (Pd) is supposed to be one of the most promising catalytic metals towards ethanol (C 2 H 5 OH) oxidation reaction (EOR). However, Pd electrocatalysts easily suffer from the poisoning of the intermediates (especially CO), resulting in the quick decay of EOR catalysis. Herein, inspired by the Brønsted-Lowry acid-base theory, a “attraction–repulsion” concept is proposed to guide the surface structure engineering toward EOR catalysts. Specifically, we induce Bi(OH) 3 species as Brønsted base onto PdBi nanoplates to effectively repel the adsorption of CO intermediates. The PdBi-Bi(OH) 3 nanoplates show an impressive mass activity of 4.46 A mg Pd -1 during the EOR catalysis and keep excellent stability. Both the stability and enhanced performance are attributed by the interfacial Brønsted base Bi(OH) 3 which can selectively attract and repel reactants and intermediates, as evidenced from in situ measurements and theoretical views.
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Biomaterials Science
·
2021
·Vol. 9
·期 18
·6169-6182
·
IF 6.843
Shuwei Xiao,Pengchao Wang,Jian Zhao,Zhengyun Ling,Ziyan An,Zhouyang Fu,Weijun Fu,Xu Zhang
A scaffold, constructed from a bi-layer silk fibroin skeleton (BSFS) and a bladder acellular matrix hydrogel (BAMH) encapsulated with adipose-derived stem cells (ASCs), was developed for bladder augmentation in a rat model. The BSFS, prepared from silk fibroin (SF), had good mechanical properties that allowed it to maintain the scaffold shape and be used for stitching. The prepared BAM was digested by pepsin and the pH was adjusted to harvest the BAMH that provided an extracellular environment for the ASCs. The constructed BSFS–BAMH–ASCs and BSFS–BAMH scaffolds were wrapped in the omentum to promote neovascularization and then used for bladder augmentation; at the same time, a cystotomy was used as the condition for the control group. Histological staining and immunohistochemical analysis confirmed that the omentum incubation could promote scaffold vascularization. Hematoxylin and eosin and Masson's trichrome staining indicated that the BSFS–BAMH–ASCs scaffold regenerated the bladder wall structure. In addition, immunofluorescence analyses confirmed that the ASCs could promote the regeneration of smooth muscle, neurons and blood vessels and the restoration of physiological function. These results demonstrated that the BSFS–BAMH–ASCs may be a promising scaffold for promoting bladder wall regeneration and the restoration of physiological function of the bladder in a rat bladder augmentation model.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Mingliang Ma,Yuying Yang,Yan Chen,Yong Ma,Ping Lyu,Aiqi Cui,Weibo Huang,Zhe Zhang,Yanzheng Li,Feiyan Si
The flower-like Fe 3 O 4 /SiO 2 /MnO 2 /BiOBr-Bi magnetic composite photocatalyst was prepared in this work. The combination of BiOBr and Bi metal with flower-like MnO 2 constituted a heterojunction structure, which increased the specific surface area of the photocatalyst and promoted the separation of photo-generated carriers, resulting in the enhanced catalytic performance. The morphologies and the compositions of the photocatalyst were characterized in detail. Under simulated light, the degradation of organic dye methylene blue (MB) was used to research the photocatalytic activity. In the case of 15 mg photocatalyst, it was found that the photocatalytic degradation efficiency to the MB solution was 95.23% within 150 min. Moreover, the degradation rate of MB could still reach 81.11% after four cycles. The design of flower-like composites with magnetic core-shell structure provided a new method for fabricating photocatalysts having excellent catalytic performance and cyclic stability.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xingchi Li,Huaming You,Cheng Wang,Dongmei Liu,Rui Yu,Siyu Guo,Yuan Wang,Yukou Du
Modifying the electronic structure and optimizing the geometric structure can expeditiously tune the electrocatalytic properties of catalysts, resulting in considerably enhanced electrocatalytic performance towards electrocatalytic oxidation of liquid fuels . We herein report a simple synthetic strategy to prepare Bi-doped 3D taraxacum-like Pd nanocages (NCs) composed of porous nanosheets , which possess high surface areas and strong synergistic effects. Notably, a trace of Bi diffuses into the lattice of Pd and increases the electronic effects of the surface of Pd, endowing PdBi-0.5 NCs/C with superior electrocatalytic performance towards ethanol oxidation reaction (EOR). The mass activity and specific activity of PdBi-0.5 NCs/C were 3494.8 mA mg Pd −1 and 10.37 mA cm −2 , being 4.08- and 4.82- fold enhancements as compared with commercial Pd/C, respectively. Moreover, the highly open porous 3D nanocages structure with rich active sites and defects can also facilitate the mass/electron transfer to favor the EOR kinetics.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Junli Wang,Lei Jin,Tingting Wang,Lijun Zhao,Fan Guan,Shaopeng Li,Dan Wang,Junhao Zhang
We report the ethylene glycol-mediated solvothermal synthesis of the continuous solid solution (Sb 1-x Bi x ) 2 S 3 (0 < x < 1) with 1D nanostructures (nanowires and nanorods). The ternary products show a broad variation in Bi:Sb composition ratios (53:47–7:93), length-to-diameter aspect ratios (2.7–66.2), and optical bandgap energies (1.36–1.55 eV) as well as an enhanced photocurrent (e.g., (Sb 1-x Bi x ) 2 S 3 with x = 0.22 is three times higher than pure Sb 2 S 3 ). The gradual shift of peak positions in the XRD patterns and the uniform distributions of Bi, Sb and S elements in EDS mapping prove the formation of single-phase (Sb 1-x Bi x ) 2 S 3 solid solution. Its formation is due to an isostructure-favored alloying mechanism, since Sb 2 S 3 and Bi 2 S 3 possess the same orthorhombic structure (space group: Pnma) and the similar lattice constants . The substitution of Bi for Sb isovalent cations can shorten the lengths of ternary alloyed Sb–Bi–S nanowires and transfer them to low aspect-ratio nanorods at high Bi/Sb precursor ratios. The dependence of the lengths on Bi/Sb ratios is reasonably interpreted considering the differences in the number of nuclei at different amounts of Bi ions and the covalency of Bi–S and Sb–S bonds during the alloying process.
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CELLULOSE
·
2020
·Vol. 27
·期 6
·3037-3054
·
IF 4.21
Zhang Yunlei,Li Bing,Guan Wen,Wei Yanan,Yan Changhao,Meng Minjia,Pan Jianming,Yan Yongsheng
Nitrogen-doped carbon materials have attracted enormous interest in catalysis owing to their outstanding catalytic performance. In this work, nitrogen-doped carbonaceous catalysts (NCC) supported on inexpensive and naturally abundant halloysite nanotubes were successfully synthesized via precipitation polymerization, calcination, and sulfonation processes. The physical and chemical properties of the obtained catalysts were systematically characterized by different methods. The results indicated that NCC catalysts had mesoporous structures, excellent thermostability and acid-base bi-functional active sites. One-pot synthesis of 5-hydroxymethylfurfural (HMF) from glucose was performed to investigate the synthesized NCC catalysts. Benefiting from the synergistic effects of the acid-base bi-functional active sites, the highest HMF yield (62.8%) was achieved in an isopropanol-mediated DMSO system under optimal conditions. Moderate to excellent yields of HMF were also obtained from one-pot conversions of other carbohydrates, including inulin, sucrose, cellobiose, maltose and starch, with our developed catalytic system. The one-pot production of HMF from cellulose was also smoothly processed by the NCC bi-functional catalyst in an IL-based system. This work has developed a versatile strategy for designing nitrogen-doped carbonaceous catalysts that can be employed for the direct transformation of renewable carbohydrates to platform chemicals.
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Acta Biomaterialia
·
2020
·
IF 7.242
Jie Liu,Jing Zhang,Fei Huang,Yong Deng,Bing Li,Ruizhuo Ouyang,Yuqing Miao,Yun Sun,Yuhao Li
ABSTRACT Developing a multi-functional radiosensitizer with high efficiency and low toxicity remains challenging. Herein, we report a mesoporous heterostructure radiosensitizer ( [email protected] ) containing Lu-based upconversion nanophosphor (UCNP) and Bi-based nanomaterial loaded with iron phthalocyanine for X-ray and NIR light dual-triggered tri-modal tumor therapy. NaLuF 4 :Yb,Tm, a Lu-based UCNP, offers radiosensitization and upconversion luminescence for optical bio-imaging. However, Bi has a higher X-ray mass attenuation coefficient than Lu . Thus, after stepwise fabrication, Na 0.2 Bi 0.8 O 0.35 F 1.91 :Yb (NBOF) was assembled with the UCNP to form a mesoporous heterostructure composite. This enhanced the radiosensitization effect and drug load to realize multi-modal tumor therapy. After coating it with folate-conjugated amphiphilic PEG (PFA), [email protected] realized tumor photothermal/photodynamic/radio-therapy. The structure of [email protected] was well characterized. Different properties triggered by X-ray and NIR light were evaluated. Finally, a highly efficient tumor ablation effect was demonstrated in vitro and in vivo . Consequently, this kind of nanocomposite provides a unique strategy for designing a theranostic platform for oncotherapy. Statement of Significance The synergy of enhanced radiotherapy and photothermal/photodynamic therapy is found to improve tumor therapeutic efficacy. On that basis, a heterostructure nanohybrid containing Lu-based UCNP and Bi-based mesoporous material is synthesized. The heterostructure nanohybrid can be loaded with FePc and decorated with folate-modified amphiphilic PEG to form a multi-functional theranostic nano-platform. The platform exhibits upconversion luminescence capacity, X-ray attenuation property, photothermal effect, and X-ray and NIR dual-light triggered ROS generation capability. These features can not only enable upconversion luminescence/CT bioimaging of living beings but also be applied to the photothermal/photodynamic/radio- synergistic tumor ablation. To sum up, the nanomaterial offers a novel method for the construction of a new theranostic platform.
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Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 7
·3334-3339
·
IF 5.503
You Xu,Tianlun Ren,Shanshan Yu,Hongjie Yu,Shuli Yin,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
The electrocatalytic nitrogen reduction reaction (NRR) for ammonia (NH3) synthesis is highly desirable yet still challenging. Catalysts, as the core component of electrocatalytic NRR systems, are a specific focus of research. In this work, we demonstrate that NRR active semimetal bismuth (Bi) ultrathin nanosheets (Bi NSs) could be prepared by means of the in situ electrochemical reduction-assisted exfoliation of BiOCl nanoplates (BiOCl NPs). Such a conversion, from semiconductive BiOCl NPs to semimetal Bi NSs, could create enlarged surface areas and bring about abundant under-coordinated Bi sites and accelerated electron transport capability. With these advantageous properties, the as-converted Bi NSs exhibit efficient NRR electrocatalytic activity in 0.1 M Na2SO4, achieving a high faradaic efficiency (14.14%) and NH3 yield (11.11 μg h−1 mgcat.−1) at −0.5 V (vs. reversible hydrogen electrode), as well as high NH3 selectivity.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2026
·
IF 3.3
Ma Yong-hu,Ma Fu,Zhao Tiao-bin,Gao Zi-yi,La Ying-hong,Zhao Hong-jian
Limited interfacial charge separation efficiency and insufficient redox capacity severely hinder the practical application of conventional Bi 2 WO 6 -based photocatalysts. To address these issues, a novel Bi(C 2 O 4 )OH/Bi 2 WO 6 heterojunction was constructed via a facile room-temperature one-pot liquid-phase deposition method. Multiple characterizations confirm the intimate interfacial contact between Bi(C 2 O 4 )OH nanorods and uniformly anchored Bi 2 WO 6 nanoparticles, accompanied by the introduction of abundant oxygen vacancies. On the basis of radical trapping experiments, EPR measurements, and electrochemical tests, an S-scheme charge-transfer model is proposed. This model retains the strong redox potentials of both semiconductors, while oxygen vacancies are speculated to act as efficient interfacial charge-trapping and transfer sites to synergistically promote the migration and separation of photogenerated carriers. The optimized 7%Bi(C 2 O 4 )OH/Bi 2 WO 6 composite achieves an RhB removal efficiency of 97.6% within 60 min for 50 mL of RhB solution (30 mg·L -1 ) under 5-W LED lamp irradiation. Radical trapping and EPR tests confirm that ·O 2 - , h⁺, and ·OH are the dominant active species. This work presents a facile and efficient room-temperature fabrication strategy for Bi-based heterojunctions and systematically elucidates the synergistic promotion mechanism between oxygen vacancies and the proposed S-scheme charge-transfer pathway, offering new insights for designing high-performance photocatalysts for organic wastewater remediation.
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