APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
Yanan Liu,Chenglin Miao,Pengfei Yang,Yufei He,Junting Feng,Dianqing Li
The ultrathin TiO 2 nanosheets (TiO 2 -U) with abundant defects were successfully fabricated as substrates to support well-dispersed Pt nanoparticles with low metal loading by photochemical route (P), with impregnated Pt/TiO 2 -U, Pt/TiO 2 -bulk and photoreduced Pt/TiO 2 -bulk as control samples, to focus on studying the inductive effect of oxygen vacancy-rich ultrathin TiO 2 on highly dispersed Pt nanoparticles, and their synergetic promotional effect for CO 2 photoreduction. As expected, P-Pt/TiO 2 -U exhibited excellent photocatalytic efficiency for the selective conversion of CO 2 into CH 4 and CO. The ultrathin TiO 2 nanosheets with a large number of low coordinative sites and ultralarge surface area promoted the rate of electron-transfer. The ultrafine Pt nanoparticles induced by photochemical strategy facilitated the efficient separation of electron–hole pairs. Furthermore, the synergy of metal and support improved the adsorption ability of CO 2 . These three factors were considered to drive jointly the enhancement of catalytic performance in this system. This work offers deep insights for the design of highly efficient catalysts with coordinatively unsaturated sites for CO 2 photoconversion in the presence of H 2 O.
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高影响因子
Journal of Physical Chemistry C
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2018
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IF 4.484
Peng Zhao,Yanlu Li,Lili Li,Shulin Bu,Weiliu Fan
Here, we report oxygen vacancy (VO)-modified B/N-codoped ZnGa2O4 (VO-B/N-ZGO) nanospheres, showing excellent photocatalytic H2 production even without a Pt cocatalyst, which is better than that obtained with VO-modified B-doped ZnGa2O4 (VO-B-ZGO) or N-doped ZnGa2O4 (N-ZGO) and as high as about three times of that achieved with the undoped ZnGa2O4 (ZGO) photocatalyst. The dramatically enhanced photocatalytic activity of VO-B/N-ZGO predominately originates from the improvement of charge separation and surface activation. Experimental characterization combined with the theoretical calculation method demonstrates that VO-B/N-ZGO can show effective charge compensation more easily through the interaction of oxygen vacancies, interstitial boron, and substitutional nitrogen; especially for the formation of a B–N bond, it avoids the presence of semioccupied states as new recombination centers in a doped photocatalyst. In addition, VO-B/N-ZGO rich in reactive sites is generated by oxygen vacancy-modified B/N-codoping, which overcomes the limitation for most semiconductors without high H2 evolution activities in the absence of a cocatalyst and provides a potentially new photocatalytic H2 generation research.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2019
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IF 4.029
Xudong Qi,Yan Zhao,Enwei Sun,Juan Du,Kai Li,Ye Sun,Bin Yang,Rui Zhang,Wenwu Cao
The photoluminescence , dielectric relaxation, ferroelectric hysteresis, and field-induced strain properties of Pr 3+ -doped 0.24Pb(In 1/2 Nb 1/2 )O 3 -0.42Pb(Mg 1/3 Nb 2/3 )O 3 -0.34PbTiO 3 (PIN-PMN-PT:Pr 3+ ) multifunctional ceramics have been investigated. It was found that Pr 3+ doping enhanced the dielectric diffuseness and relaxation behavior of PIN-PMN-PT ceramics. Slim P - E loops and S - E curves appear in PIN-PMN-PT:Pr 3+ ceramics when the Pr 3+ doping concentration reaches 1.4 mol%. Local domain configurations associated with phase transitions were investigated by piezoresponse force microscopy (PFM). Large electrostrictive coefficient Q 33 (˜0.03 m 4 /C 2 ) and high energy-storage efficiency η (92%) were obtained in 2 mol% Pr 3+ -doped PIN-PMN-PT ceramic in the ergodic relaxor (ER) phase at room temperature. The giant electrostrictive effect and excellent energy-storage performance are related to the field-induced dynamic behavior of polar nanoregions (PNRs). The results show that the PIN-PMN-PT:Pr 3+ system is an excellent multifunctional material for making electromechanical and energy storage devices.
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Nano Research
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2014
·Vol. 8
·期 1
·271-280
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IF 6.963
Deogratias Ntirikwendera,Ji Muwei,Zhang Yong,Liu Jiajia,Zhang Jiatao,Zhu Hesun
Reducing Pt loading, while improving electrocatalytic activity and the stability of Pt-based nanostructured materials, is currently a key challenge in green energy technology. Herein, we report the controllable synthesis of tri-metallic (Au@Ag@Pt) and bimetallic (Ag@Pt) particles consisting of a controllable thin Pt shell, via interface-mediated galvanic displacement. Through oil-ethanol-H 2 O interface mediation, the controllable “out to in” displacement of Ag atoms to Pt enables the formation of a thin Pt shell on monodisperse sub-ten-nanometer Au@Ag and Ag nanocrystals. The synthesized nanoparticles with a thin Pt shell exhibited potential catalytic activity towards the oxygen reduction reaction (ORR) due to the high exposure of Pt atoms.
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高影响因子
Journal of Materials Chemistry A
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2015
·Vol. 3
·期 47
·23732-23742
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IF 7.443
Li Zhang,Xianliang Fu,Sugang Meng,Xiaoliang Jiang,Jinghui Wang,Shifu Chen
Noble metal-modified CdS is one of the most promising photocatalysts for solar H2 production due to its intrinsic band structure merits. It is highly desirable to develop an effective preparation route to pursue a high photocatalytic performance and to minimize the use of costly noble metals. For the first time, a simple and convenient one-pot solvothermal (OPS) method was developed to prepare platinized CdS nanorods (Pt/CdS-N) in this work. The formation of a hexagonal 1D structure CdS and the deposition of Pt(0) can be achieved simultaneously by the method, which is more efficient than the conventional post-deposition routes, such as photochemical reduction and impregnation–reduction methods, to enhance the photocatalytic activity of CdS-N for the H2 evolution reaction (HER). The H2 evolution rate (rH2) of CdS-N could be remarkably improved from 2.10 to 10.29 mmol h−1 g−1 by loading with only 0.06% Pt (wt%) under visible light irradiation (λ > 400 nm, 300 W Xe lamp). No deactivation of the sample was observed in cyclic experiments for 20 h reaction. This loading amount of Pt is substantially lower than the reported optimal values (commonly in the range of 0.5–2%) by more than one order of magnitude. A criterion of enhancement coefficient was proposed to identify the ideal loading amount of Pt. The result indicates that, considering the improvement efficiency of rH2 and the loading amount of Pt, this ultra-low amount of Pt is more practical than the optimal amount (determined to be 0.5%). The high and stable activity of Pt/CdS-N can be attributed to the hexagonal 1D structure of CdS and the high dispersion of Pt in the Pt(0) state. Besides Pt, the OPS method is also valid for the deposition of Pd or Ru on CdS and rH2 decreases in the order Ru/CdS-N (12.89) > Pt/CdS-N (10.29) > Pd/CdS-N (6.72 mmol h−1 g−1) with a loading amount of 0.06%. It reveals that the use of noble metal co-catalysts can be significantly reduced without unduly sacrificing the HRE efficiency. The developed OPS route provides a new insight into the preparation of highly efficient and stable chalcogenide photocatalysts for the HER.
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高影响因子
Journal of Materials Chemistry A
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2015
·Vol. 3
·期 10
·5352-5359
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IF 7.443
Li-Li He,Pei Song,Ai-Jun Wang,Jie-Ning Zheng,Li-Ping Mei,Jiu-Ju Feng
In this work, a general strategy was developed for the facile synthesis of bimetallic AuM (M = Pt or Pd) alloyed flowerlike-assembly nanochains (FANs) with the assistance of diprophylline as a structure-directing and stabilizing agent. The morphologies, crystal structures, and compositions of AuPt and AuPd FANs were investigated primarily by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The formation mechanism was discussed in some detail by varying the concentration of diprophylline. The as-prepared AuM FANs displayed improved catalytic activities and better stabilities for oxygen reduction reaction (ORR) compared to commercial E-TEK Pt/C, Pt black and Pd black.
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高影响因子
ELECTROCHIMICA ACTA
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2014
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IF 4.086
Lijuan Zhao,Baizhao Zeng,Faqiong Zhao
A novel tartrazine imprinted polymer – multiwalled carbon nanotubes - ionic liquid supported Pt nanoparticles composite film coated glassy carbon electrode (MIP–MWNTs-IL@PtNPs/GCE) was presented. It was fabricated by coating a GCE with MWNTs-IL@PtNPs mixture, followed by MIP suspension. The IL functionalized MWNTs was prepared by Click chemistry, and Pt nanoparticles were then loaded on it using ethylene glycol as reducing agent. The MIP was prepared by typical free radical polymerization using 4-vinylpyridine as functional monomer. The resulting MIP–MWNTs-IL@PtNPs/GCE showed good analytical performance when it was used for the electrochemical determination of tartrazine. Under the optimized conditions, the peak current was linear to tartrazine concentration in the ranges of 0.03 – 5.0 μM and 5.0 – 20 μM with sensitivities of 0.72 μA/μM mm 2 and 0.24 μA/μM mm 2 , respectively; the detection limit was 8 nM (S/N = 3). The sensor was successfully applied to the determination of tartrazine in practical samples and the recovery for the standards added was 88 – 108%.
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高影响因子
BIOMATERIALS
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2015
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IF 8.557
Xiaoran Deng,Yunlu Dai,Jianhua Liu,Ying Zhou,Ping'an Ma,Ziyong Cheng,Yinyin Chen,Kerong Deng,Xuejiao Li,Zhiyao Hou,Chunxia Li,Jun Lin
Combining the multi-modal medical imaging with cancer therapy in one single system has attracted the great interests for theranostic purpose. In this paper, CaF 2 :Yb 3+ /Er 3+ /Mn 2+ -poly(2-Aminoethyl methacrylate) (UCHNs-PAMA) hybrid microspheres were successfully fabricated. The synthetic route to the nanocomposite based on a facile hydrothermal method for fabrication of hollow upconversion (UC) nanospheres at first and then post-filling the PAMA interiorly through photo-initiated polymerization. The UCHNs showed orange fluorescence under 980 nm near infrared (NIR) laser excitation , which provided the upconverting luminescence (UCL) imaging modality . Meanwhile, the presence of functional Mn 2+ and Yb 3+ offered the enhanced T 1 -weighted magnetic resonance (MR) and computed tomography (CT) imaging, respectively. Thanks to introducing amine groups-containing PAMA inside the hollow nanospheres, the Pt(IV) pro-drug, c,c,t-Pt(NH 3 ) 2 Cl 2 (OOCCH 2 CH 2 COOH) 2 (DSP), can be conveniently bonded on the polymer network to construct a nanoscale anti-cancer drug carrier. The UCHNs-PAMA-Pt(IV) nanocomposite shows effective inhibition for Hela cell line via MTT assay . In contrast, Pt(IV) pro-drug and UCHNs-PAMA microspheres behave little cytotoxicity to Hela cells. This should be attributed the fact that the anti-cancer ability can be recovered only when Pt(IV) pro-drug was reduced to Pt(II)-drug in cellular environment. Furthermore, the in vivo experiments on small mice also confirm that the hybrid microspheres have relatively low toxic side effects and high tumor inhibition rate. These findings show that the multifunctional hybrid microspheres have potential to be used as UCL/MR/CT tri-modal imaging contrast agent and anti-cancer drug carriers.
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PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
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2015
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IF 6.409
Yuanyuan Liu,Hongmin Ma,Jian Gao,Dan Wu,Xiang Ren,Tao Yan,Xuehui Pang,Qin Wei
In this study, a novel and ultrasensitive sandwich-type electrochemical immunosensor was designed for the quantitative detection of squamous cell carcinoma antigen (SCCA) based on the β-cyclodextrin functionalized graphene nanosheet (CD-GN) and the ternary hollow Pt/PdCu nanocube anchored on three-dimensional graphene framework (Pt/PdCu-3DGF). CD-GN exhibited high specific surface area and good dispersibility and stability in water, which were beneficial to fix captured antibodies (Ab 1 ) through the supramolecular host-guest interaction between CD and Ab 1 . The abundant oxygen-containing functional groups on 3DGF provided binding sites for anchoring noble metal nanoparticles . Pt/PdCu-3DGF could capture detected antibodies via the interaction of Pd-NH 2 and Pt-NH 2 . Furthermore, the ternary metal nanoparticles exhibited high electrocatalytic activity toward the reduction of hydrogen peroxide. Under optimal conditions, the fabricated immunosensor showed a sensitive response to SCCA with two linear ranges. The linear ranges are 0.0001–1 ng/mL and 1–30 ng/mL with a detection limit of 25 fg/mL. Additionally, the proposed immunosensor showed good reproducibility and stability.
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PubMed
高影响因子
Polymer Chemistry
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2015
·Vol. 6
·期 15
·2892-2899
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IF 5.52
Shuai Xu,Zhihuan Weng,Jing Tan,Jia Guo,Changchun Wang
We present the preparation of nanoscale porous organic polymer (POP) composite microspheres consisting of an Fe3O4 supraparticle as the core and micro-/mesoporous POP as the shell. The core/shell-structured Fe3O4@PS microspheres were synthesized, and then subjected to a seeded swelling polymerization in the PS shell using a mixture of divinyl benzene (DVB) and vinylbenzene chloride (VBC). The formed poly(VBC-co-DVB) networks were blended with PS in the shell, resulting in a distinct phase segregation. Upon a Friedel–Craft-type hyper-crosslinking treatment, the POP structure was obtained showing the specific porosity. During this process, the non-crosslinking PS chains were extracted out of the shell and large-sized mesopores were achieved with the micropores obtained by the hyper-crosslinking networks. By varying the feed amount of VBC and DVB, the phase segregation was changed and the prevailing mesopores could be tuned from 4 nm to 30 nm. The contribution of micropores to the entire porosity was accordingly altered. In light of the characteristics of dual-level pores and magnetic recyclability, the Pt nanoparticles were locally reduced within the mesopores, and the reactive substrates were then accessible to microporous zones in the POP shell. The enantioselective hydrogenation of ethyl pyruvate was applied to evaluate the catalytic activity of the Fe3O4@POP/Pt composites. Under optimized conditions (20 bar H2 pressure, 20 h, R.T. and molar ratio of Pt/CD: 6/1), the Fe3O4@POP/Pt composite catalysts containing 10 wt% Pt nanoparticles were validated to have excellent catalytic activity, outstanding reusability, and a high product yield and ee value (80.7%) for the enantioselective conversion of ethyl pyruvate to ethyl lactate.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2014
·Vol. 131
·期 16
·
IF 1.64
Shoulian Wei,Yong Liu,Tao Hua,Ling Liu,Hongwu Wang
A novel molecularly imprinted electrochemical sensor was developed for the sensitive and selective determination of ampicillin (AMP). The sensor was prepared on a platinum electrode modified with multiwalled carbon nanotubes (MWCNTs), gold nanoparticles (AuNPs), and a thin film of molecularly imprinted polymers (MIPs). MWCNTs and AuNPs were introduced to enhance the sensor's electronic transmission and sensitivity. The molecularly imprinted polymer (MIP) was synthesized using AMP as the template molecule, methacrylic acid as functional monomer, and ethylene glycol maleic rosinate acrylate (EGMRA) as cross-linker. The performance of the proposed imprinted sensor was investigated using cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). The results showed that the imprinted film displayed a fast and sensitive response to AMP. Under optimal conditions, response peak current had a linear relationship with the concentration of AMP in the range of 1.0 × 10 −8 mol/L to 5.0 × 10 −6 mol/L and a detection limit of 1.0 × 10 −9 mol/L ( S/N = 3). This imprinted sensor was used to detect AMP in food samples with recoveries of 91.4–105%. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40613.
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高影响因子
CARBON
·
2017
·
IF 6.337
Hong Yuan,Jia Liu,Qingze Jiao,Yongjian Li,Xiufeng Liu,Daxin Shi,Qin Wu,Yun Zhao,Hansheng Li
A novel sandwich-like hierarchical structure composed of reduced graphene oxide (RGO) and uniform cobalt disulfide (CoS 2 ) octahedrons is successfully prepared by a simple one-step solvothermal process, in which Co 2+ cations attracted into graphene framework by the electrostatic adsorption induce the growth of octahedral CoS 2 nanoparticles between the layers of graphene. The fascinating sandwich-like structured CoS 2 /RGO hybrid inherits excellent electrical conductivity of graphene skeletons. Meanwhile, CoS 2 octahedrons intercalated between the layers of graphene provide both rich inner active sites for the reduction of triiodide and abundant mesoporous structure for effective electrolyte diffusion. Benefit from the synergistic effects of CoS 2 octahedrons and RGO, the dye-sensitized solar cell (DSSC) assembled with this CoS 2 /RGO counter electrode (CE) manifests excellent photoelectric conversion efficiency (7.69%), even higher than that of DSSC with conventional noble metal Pt CE (7.38%). Furthermore, CoS 2 /RGO composite displays outstanding electrochemical stability in I 3 − /I − redox electrolyte . Overall, this design provides a new strategy for the development of alternative Pt-free counter electrode materials in a DSSC system.
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高影响因子
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