ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Yongsheng Wei,Peichao Zou,Yuanchao Yue,Maosen Wang,Wenying Fu,Si Si,Lu Wei,Xinsheng Zhao,Guangzhou Hu,Huolin L. Xin
Exploring electrocatalysts with satisfactory activity and durability has remained a long-lasting target for electrolyzing water, which is particularly significant for sustainable hydrogen fuel production. Here, we report a quaternary B/P-codoped transition metal Co-Mo hybrid as an efficient alternative catalyst for overall water splitting. The Co-Mo-B-P/CF dual nanowafers were deposited on a copper foam by double-pulse electrodeposition, which is favorable for achieving a nanocrystalline structure. The Co-Mo-B-P/CF catalyst shows a high catalytic activity along with good long-term stability in 1.0 M KOH solutions for both the hydrogen and oxygen evolution reactions, requiring 48 and 275 mV to reach 10 mA cm–2, respectively. The synergetic effect between Co-Mo and doped B and P elements is mainly attributed to the excellent bifunctional catalysis performance, while the dual-nanowafer structure endows Co-Mo-B-P with numerous catalytical active sites enhancing the utilization efficiency of atoms. Moreover, the catalytic capability of Co-Mo-B-P/CF as a bifunctional electrocatalyst for the overall water splitting is proved, with the current density of 10 mA cm–2 accomplished at 1.59 V. After the stability test for overall water splitting at 1.59 V for 24 h, the activity almost remains unchanged. The features of excellent electrocatalytic activity, simple preparation, and inexpensive raw materials for Co-Mo-B-P/CF as a bifunctional catalyst hold great potentials for overall water splitting.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Wei Guo,Yao Qin,Cheng Liu,Binbin Guo,Junhua Zou,Zenghong Xie,Ling Wu
This work reports the rapid and effective photocatalytic dechlorination of 3,3′,4,4′-trtrachlorobiphenyl (PCB77) with highly dispersed Pd nanoclusters loaded two-dimensional (2D) TiO 2 (B) nanosheets (Pd/TiO 2 (B)) under visible light irradiation, achieving a dechlorination efficiency of 100 % with H 2 O used as an H-donor source. The ultra-thin TiO 2 (B) nanosheets provide a good platform for studying the dechlorination intermediates/pathways of PCB77 at the molecular level. It is proved that the dechlorination of PCB77 is a stepwise process, in which chlorines at the para positions are much more susceptible than those at the meta positions due to the activation of the C Cl bond in the presence of Pd nanoclusters. Furthermore, in-situ FTIR results of D 2 O absorption suggest that the TiO 2 (B) nanosheets with abundant surface defects greatly promote the activation of water molecules via the formation of surficial complexes by hydrogen bonds. Finally, a synergistic mechanism is proposed for photocatalytic dechlorination of PCB77 over Pd/TiO 2 (B). The study provides an efficient method for complete dechlorination of PCB77 and an in-depth understanding photocatalyzed dechlorination reaction mechanism at the molecular level, which may extend to other photocatalytic dehalogenation reactions of halogenated pollutants.
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JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 2
·1577-1589
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IF 3.553
Li Zhaohua,Hu Rui,Ye Shuai,Song Jun,Liu Liwei,Qu Junle
Abstract We report herein a versatile new approach for improving the photodegradation performance of UiO-66 by introducing 2-methylimidazole through a straightforward in situ one-pot solvothermal method. The resultant complex UiO-66-M-0.7 has demonstrated a reaction rate constant of 0.0183 min −1 in the photodegradation of rhodamine B under visible light, which is 69.4% higher than that with unmodulated UiO-66. Further investigation has confirmed that the improved activity can be attributed to enhanced adsorption of the dye by the photocatalyst during the adsorption–desorption equilibrium. The main active species involved in the photodegradation process have been identified as h + and O 2 − ·. In addition, the complex has shown ideal stability in recycling tests and excellent activity in the degradation of methylene blue. This study provides a novel perspective for the future design of various photocatalysts with superior performance. Graphic abstract 2-Methylimidazole-modulated UiO-66 exhibits increased catalytic performance in the photodegradation of rhodamine B (RhB) under visible light because of enhanced adsorption of RhB on the catalyst during the adsorption-desorption equilibrium.
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Inorganic Chemistry Frontiers
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2020
·Vol. 7
·期 6
·1345-1361
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IF 5.958
Yu Zhang,Qian Shao,Heyun Jiang,Lirong Liu,Mingyang Wu,Jing Lin,Jiaoxia Zhang,Shide Wu,Mengyao Dong,Zhanhu Guo
Bismuth oxychloride (BiOCl) and cerium dioxide (CeO2) composites were successfully synthesized via a facile one-step co-precipitation method. The BiOCl/CeO2 composites were observed to be sheet-like structures with some CeO2 nanoparticles distributed on the surface. The BiOCl/CeO2 composites exhibited higher photodegradation performance (98.8%) of rhodamine B (RhB) than pure BiOCl (80.2%) and CeO2 (9.6%) under solar simulated irradiation. The BiOCl/CeO2 composites with a Bi/Ce molar ratio of 4 : 1 exhibited the highest photocatalytic performance for RhB, and an optimal RhB degradation efficiency of 98.8% was achieved under solar simulated irradiation for 60 min. The photocatalytic performance results were compared with other BiOCl composites. The photocatalytic mechanisms of BiOCl/CeO2 composites were discussed by radical trapping experiments and electron spin resonance (ESR), which indicated that h+ and ˙O2− were the dominant radicals for RhB degradation.
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Gang Liu,Jia Dong,Leiyang Zhang,Linjiang Yu,Fangbin Wei,Yang Li,Jinghui Gao,Jinzhu Hu,Yan Yan,Quan Li,Kun Yu,Li Jin
A B-site acceptor doping strategy has been employed to fabricate Na 0.25 Sr 0.5 Bi 0.25 TiO 3 (NSBT- x M) relaxor dielectric ceramics for the purpose of obtaining predominant energy storage properties for pulsed power capacitor applications. MgO was selected as the acceptor additive, and the corresponding ceramics were designed and prepared by traditional preparation method of electronic bulk ceramic. The influence of MgO on the micro structure, surface micromorphology, the variation of dielectric properties and storage of electrical energy, and also the mechanism of the NSBT- x M samples were deeply and systematically studied. The substitution of Ti 4+ by Mg 2+ at B-site induces point defects companied with defect diploe P D , which influences the electrical properties dramatically. Appropriate amount of MgO can significantly increase the electrical breakdown strength and reduce P r , which is conducive to the improvement of energy storage performance. Particularly, the NSBT-0.25 M sample exhibits both high W rec (2.06 J/cm 3 ) and excellent efficiency (84%) spontaneously. It also exhibits fantastic frequency stability, fatigue endurance, and excellent charge and discharge performance.
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高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Lin Xiaona,Shi Yongli,Yu ShaSha,Li Siyi,Li Wenhui,Li Meishuang,Chen Shengxi,Wang Yuanbo,Cong Mei
A novel polymer of poloxamer188-b-PCL was synthesized via a ring-opening polymerization. Fourier transform infrared spectroscopy (FTIR), Raman, and 1H nuclear magnetic resonance (1H NMR) spectra were used to study the structures of obtained poloxamer188-b-PCL. The thermo-stability of poloxamer188 -b-PCL was carried out with a thermal gravimetric analyzer (TGA), and cytotoxicity was obtained using the CCK8 method. Cargo-free and curcumin (CUR)-loaded poloxamer188-b-PCL NPs were fabricated via the solvent evaporation method. The morphology, particle size distribution, and stability of cargo-free NPs were studied with a scanning electron microscope (SEM) and laser particle analyzer. The in vitro radioprotection activity of CUR-loaded NPs was performed. FTIR, Raman, and 1H NMR spectra confirmed that poloxamer188-b-PCL was obtained. TGA curves suggested poloxamer188-b-PCL had better thermo-stability than original poloxamer188. Cell tests suggested that the cargo-free NPs had no cytotoxicity. SEM image showed that the cargo-free NPs were spherical with a diameter of 100 nm. Free radical scavenging experiments proved that CUR-loaded NPs had better antioxidant activity than CUR solutions. CUR-loaded NPs could be detected in all tissues, including liver, kidneys and lung. In summary, this work demonstrated a feasibility of developing an injective formulation of CUR and provided a protection agent in caner radiotherapy.
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高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 25
·4250-4259
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IF 3.117
Xiaoxue Qi,Feng Shang,Tao Wang,Yuqin Ma,Yongsheng Yan
In recent years, photocatalytic degradation on inorganic semiconductors has been attracting widespread attention. However, for a single semiconductor, the speed of the recombination of electrons and holes is fast, which leads to a decrease in the absorption of sunlight, thereby affecting its photocatalytic efficiency. Therefore, the coupling of semiconductor and metal–organic framework is of great significance due to its porosity and large specific surface area. Herein, a composite photocatalyst was obtained by coupling ZIF-8 and TiO2(B) via a simple method. XRD, FT-IR spectroscopy, SEM, TEM, UV-visible diffuse reflectance spectroscopy, XPS, EPR and EDS were used to study the as-prepared samples. Photocatalytic degradation experiments confirmed that the composites have significantly improved photodegradation performance due to the increased light utilization and fast charge carrier transfer. Moreover, the possible mechanism of photodegradation was also proposed. This study provides an initial view on the coupling of semiconductor and metal–organic framework to enhance the photocatalytic performance.
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高影响因子
JOURNAL OF CHEMICAL RESEARCH
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2020
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IF 0.593
Yan Qiao,Hongchao Geng,Ning Jiang,Xingqi Zhu,Chenyi Li,Qingyun Cai
Upconversion nanoparticles, Yb,Tm,Fe-doped NaYF4 nanoparticles, are synthesized and modified with polymyxin B for the selective detection of Gram-negative bacteria. Polymyxin B, a cyclic cationic antimicrobial peptide which can specifically bind to the lipopolysaccharides of cell wall of Gram-negative bacteria, such as Escherichia coli, is used to target and bind Gram-negative bacteria. The bacteria are then quantified by measuring the fluorescence intensity of the upconversion nanoparticle–bacteria complexes at 801 nm under 980 nm excitation. A limit of detection of 36 CFU/mL is achieved in the detection of Escherichia coli, and Escherichia coli in soybean milk is successfully detected. The limited autofluorescence and photobleaching properties of the upconversion nanoparticles make the proposed method useful for in vivo fluorescence imaging of Gram-negative bacteria.
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CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Cai-Xia Li,Yue-Nan Hong,Bin Yang,Shan-Tao Zhang,Dan-Qing Liu,Xi-Ming Wang,Qian Liu,Lei Zhao,Wen-Wu Cao
Ba 0.70 Ca 0.30 Ti 1- x (Nb 0.5 Fe 0.5 ) x O 3 lead-free ceramics (abbreviated as BCTNF x , x = 0–0.12) were prepared by solid-state reaction method. The influence of B-site (Fe 0.5 Nb 0.5 ) 4+ substitution on phase structure, microstructure, dielectric , ferroelectric and piezoelectric properties of Ba 0.70 Ca 0.30 TiO 3 ceramics were systematically studied. The BCTNF x ceramics consist of diphasic tetragonal (T) and orthorhombic (O) phases at x = 0–0.04, pseudocubic (PC) and O phases at x = 0.05–0.08, cubic (C) and O phases at 0.08 < x ≤ 0.12. Increase of (Fe 0.5 Nb 0.5 ) 4+ doping improves sinterability, depresses the ferroelectric - paraelectric phase transition temperature ( T m ) monotonically from 128 °C at x = 0 to -86 °C at x = 0.12, induces enhanced relaxor behavior and weakens piezoelectric properties. The room temperature relative dielectric constant ( ε r ) and dielectric loss tangent (tan δ ) increase with increasing x and reach the maximum values of 4869 and 0.06 respectively at x = 0.06. Whereas the average grain size (abbreviated as AGS), ferroelectric properties and electric field induced strain increase significantly by introducing 2.0 mol% B-site complex cations (Fe 0.5 Nb 0.5 ) 4+ into Ba 0.70 Ca 0.30 TiO 3 ceramics. The BCTNF0.02 ceramics achieve optimal electrical properties with ε r = 1268, tan δ = 0.03, T m = 102 °C, P max = 12.8 μC/cm 2 , P r = 6.1 μC/cm 2 , E C = 6.0 kV/cm, d 33 = 117 pC/N, k p % = 0.18%, Q m = 236, bipolar S max % = 0.20%, unipolar S max % = 0.16% and d 33 ∗ = 314 pm/V. The variation of electrical properties of BCTNF x ceramics is attributed to the combined action of grain size effect, phase transition, weakness of octahedral distortion, clamping effects of the internal bias electric field E i on domain wall motion induced by B-site cations (Fe 0.5 Nb 0.5 ) 4+ displacement.
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高影响因子
ACS Applied Bio Materials
·
2019
·
IF 0
Xiaomin Zhi,Yuqian Jiang,Linlin Xie,Yanbo Li,Chen-Jie Fang
Multidrug resistance (MDR) and adverse effects of chemotherapeutic agents are severe issues in clinical cancer treatment. Due to the dysregulation of enzymes in the cancer cells, enzyme-responsive drug delivery systems (DDSs) have been considered as a viable technology for cancer chemotherapy. In the present work, doxorubicin (DOX) is visible after leaving from AuNR–LAX. After treatment with AuNR–LAX, the drug resistance index of DOX-resistant MCF-7/ADR cells was reduced from extremely high 955.0 to 1.7, implying high potential of AuNR–LAX in the MDR phenotype cancer treatment. In addition, the cellular viability of both MCF-7 and MCF-7/ADR cells decreased from 50% to 80% after treatment with AuNR–LAX along (equivalent DOX concentration = 2.3 μg/mL, Au concentration = 30 μg/mL) to below 10% after AuNR–LAX treatment plus radiation of 808 nm, due to the NIR photothermal effect of AuNRs. Human bronchial epithelial cell line 16HBE was chosen to evaluate the adverse effect of AuNR–LAX on the normal cells. At the low concentration, the cytotoxicity of LAX and AuNR–LAX is comparable for breast cancer cell MCF-7 and normal cell 16HBE. It is noted that, at high concentration (with equivalent DOX concentration = 13.1 μg/mL, Au concentration = 167.7 μg/mL), the cellular viability of 16HBE cells is over 50%, whereas that of MCF-7 cancer cells is close to 0, implying the potential of AuNR–LAX in reducing the adverse effects of DOX against normal cells/tissues. Overall, AuNR–LAX showed high potential in overcoming MDR and alleviating adverse effect on normal cells.
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PubMed
Engineering
·
2019
·
IF 4.568
Lin Chen,Jing Feng
Ferroelastic AB O 4 type RETaO 4 and RENbO 4 ceramics (where RE stands for rare earth) are being investigated as promising thermal barrier coatings (TBCs), and the mechanical properties of RETaO 4 have been found to be better than those of RENbO 4 . In this work, B -site substitution of tantalum (Ta) is used to optimize the thermal and mechanical properties of EuNbO 4 fabricated through a solid-state reaction (SSR). The crystal structure is clarified by means of X-ray diffraction (XRD) and Raman spectroscopy; and the surface microstructure is surveyed via scanning electronic microscope (SEM). The Young’s modulus and the thermal expansion coefficient (TEC) of EuNbO 4 are effectively increased; with respective maximum values of 169 GPa and 11.2 × 10 −6 K −1 (at 1200 °C). The thermal conductivity is reduced to 1.52 W·K −1 ·m −1 (at 700 °C), and the thermal radiation resistance is improved. The relationship between the phonon thermal diffusivity and temperature was established in order to determine the intrinsic phonon thermal conductivity by eliminating the thermal radiation effects. The results indicate that the thermal and mechanical properties of EuNbO 4 can be effectually optimized via the B -site substitution of Ta, and that this proposed material can be applied as a high-temperature structural ceramic in future.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Limeng Liu,Jozef Vleugels,Shuigen Huang,Jie Wei,Yujin Wang
TaC ceramics with 0-0.237 wt% B addition were prepared by hot pressing. The effect of B addition on the phase constitution, interfacial chemistry/bonding and mechanical properties of the TaC ceramics were investigated. Upon B addition, the elimination of O impurity and segregation of B at grain boundaries were evidenced, accompanied by an increase in bonding strength of the TaC grains, to result in a fracture mode change from intergranular to transgranular and a reduced fracture toughness. Addition of excessive B resulted in the formation of TaB 2 and C within TaC ceramics. Further, TaC-TaB 2 -SiC composites were prepared by Si addition. Coherent bonding between TaB 2 and TaC was preserved in the TaC-TaB 2 -SiC composites, and residual stresses due to thermal expansion mismatch of the different phases increased flexural strength and fracture toughness of the composites.
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