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  1. Article ; Online: Light-to-Hydrogen Improvement Based on Three-Factored Au@CeO

    Van Dao, Dung / Choi, Hyuk / Nguyen, Thuy T D / Ki, Sang-Woo / Kim, Gyu-Cheol / Son, Hoki / Yang, Jin-Kyu / Yu, Yeon-Tae / Kim, Hyun You / Lee, In-Hwan

    ACS nano

    2022  Volume 16, Issue 5, Page(s) 7848–7860

    Abstract: Recently, various attempts have been made for light-to-fuels conversion, often with limited performance. Herein we report active and lasting three-factored hierarchical photocatalysts consisting of plasmon Au, ceria semiconductor, and graphene conductor ... ...

    Abstract Recently, various attempts have been made for light-to-fuels conversion, often with limited performance. Herein we report active and lasting three-factored hierarchical photocatalysts consisting of plasmon Au, ceria semiconductor, and graphene conductor for hydrogen production. The Au@CeO
    Language English
    Publishing date 2022-05-06
    Publishing country United States
    Document type Journal Article
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.2c00509
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Effect of core and surface area toward hydrogen gas sensing performance using Pd@ZnO core-shell nanoparticles.

    Nguyen, Thuy T D / Dao, Dung Van / Kim, Dong-Seog / Lee, Hu-Jun / Oh, Sang-Yeob / Lee, In-Hwan / Yu, Yeon-Tae

    Journal of colloid and interface science

    2020  Volume 587, Page(s) 252–259

    Abstract: A versatile hydrogen gas sensor is fabricated using Pd@ZnO core-shell nanoparticles (CSNPs), which were synthesized through a hydrothermal route. Effect of oxidation behavior of Pd core to hydrogen sensing is also investigated for Pd@ZnO CSNPs. ... ...

    Abstract A versatile hydrogen gas sensor is fabricated using Pd@ZnO core-shell nanoparticles (CSNPs), which were synthesized through a hydrothermal route. Effect of oxidation behavior of Pd core to hydrogen sensing is also investigated for Pd@ZnO CSNPs. Accordingly, Pd@ZnO-2 sensor (core-shell sample was calcined in argon) demonstrates the best performance with respect to Pd@ZnO-1 (core-shell sample was calcined in air) and pure ZnO. It shows a much higher response (R = R
    Language English
    Publishing date 2020-12-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2020.12.017
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

    Z 71/707: Show issues

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  3. Article: Au@CeO2 nanoparticles supported Pt/C electrocatalyst to improve the removal of CO in methanol oxidation reaction

    Dao, Dung Van / Adilbish, Ganpurev / Le, Thanh Duc / Lee, In-Hwan / Nguyen, Thuy T.D / Yu, Yeon-Tae

    Journal of catalysis. 2019 Sept., v. 377

    2019  

    Abstract: Direct methanol fuel cells (DMFCs) are emerging as clean and renewable energy sources for global-scale sustainable energy solutions. However, several limitations of the current standard catalyst (platinum supported carbon black: Pt/C) prevent their ... ...

    Abstract Direct methanol fuel cells (DMFCs) are emerging as clean and renewable energy sources for global-scale sustainable energy solutions. However, several limitations of the current standard catalyst (platinum supported carbon black: Pt/C) prevent their commercialization. As an effective co-catalyst, Au@CeO2 core-shell structures are greatly advantageous for getting over the remaining hurdles of Pt/C in DMFCs. Herein, we report an efficient approach for the fabrication of electrocatalyst for DMFCs consisting of three components (Pt/C, Au@CeO2 and Pt catalysts) loaded on carbon cloth using spray and electrophoresis deposition methods. The obtained Pt/C-Au@CeO2-Pt electrocatalyst proved to have high electrochemical surface area (ECSA-77.8 m2/gPt) and high methanol oxidation reaction (MOR) activity (1267 mA/mgPt), which were 1.7 and 2.3 times greater than those of Pt/C only (45.6 m2/gPt and 560 mA/mgPt). In addition, the presence of Au@CeO2 nanoparticles can further enhance the stability of the Pt/C-Au@CeO2-Pt electrocatalyst toward the MOR activity. The improved MOR performance of the Pt/C-Au@CeO2-Pt electrocatalyst could be mainly attributed to the production of abundant OHads promoters, reduction of charge transfer resistance and enhancement of Pt catalytic efficient utilization. It helps to wholly oxidize COads intermediate as dominant poisoning species on Pt catalyst, which are often generated during the MOR operation in acidic condition.
    Keywords carbon ; catalysts ; ceric oxide ; commercialization ; electrochemistry ; electrophoresis ; fuel cells ; gold ; methanol ; nanoparticles ; oxidation ; platinum ; renewable energy sources ; soot ; surface area
    Language English
    Dates of publication 2019-09
    Size p. 589-599.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 1468993-5
    ISSN 0021-9517
    ISSN 0021-9517
    DOI 10.1016/j.jcat.2019.07.054
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Defect-rich N-doped CeO₂ supported by N-doped graphene as a metal-free plasmonic hydrogen evolution photocatalyst

    Van Dao, Dung / Jung, Hyun Dong / Nguyen, Thuy T. D / Ki, Sang-Woo / Son, Hoki / Bae, Kang-Bin / Le, Thanh Duc / Cho, Yeong-Hoon / Yang, Jin-Kyu / Yu, Yeon-Tae / Back, Seoin / Lee, In-Hwan

    Journal of materials chemistry A. 2021 Apr. 28, v. 9, no. 16

    2021  

    Abstract: Heteroatom doping into metal oxides advantageously modulates optoelectronic properties and provides promising possibilities for efficient light-to-energy conversion. Herein, nitrogen-doped ceria (N-CeO₂) nanoparticles are prepared and then coupled with ... ...

    Abstract Heteroatom doping into metal oxides advantageously modulates optoelectronic properties and provides promising possibilities for efficient light-to-energy conversion. Herein, nitrogen-doped ceria (N-CeO₂) nanoparticles are prepared and then coupled with nitrogen-doped graphene (N-Gr) to create an active and long-lasting N-CeO₂/N-Gr heterocatalyst. Optoelectronic features of N-doping materials (e.g., plasmon) are significantly improved toward the visible-light region, particularly for 3.9% N-CeO₂/N-Gr nanocomposites. Namely, the 3.9% N-CeO₂ possesses numerous catalytic active defects (N states, oxygen vacancy, and Ce³⁺ species), leading to a narrow bandgap energy and to the improved plasmonic properties of the ceria host, while the N-Gr preferably serves as an electron scavenger to collect plasmon-generated hot electrons migrating from 3.9% N-CeO₂ to drive photocatalytic reactions under the irradiation of visible-light. Resultantly, the 3.9% N-CeO₂/N-Gr photocatalyst delivers an impressive hydrogen evolution reaction (HER) rate of 3.7 μmol mgcₐₜ⁻¹ h⁻¹ under visible-light, which is 2.0- and 8.2-fold greater than those obtained from 3.9% N-CeO₂ and CeO₂ ones, respectively. Additionally, the combination of 3.9% N-CeO₂ and N-Gr synergistically produces a long-lasting plasmonic HER photocatalyst system. Metal-free plasmonic N-doped oxides supported by N-doped graphene pave a promising pathway for efficient light-to-hydrogen fuel production accordingly.
    Keywords energy ; fuel production ; graphene ; hydrogen production ; irradiation ; light ; nanocomposites ; oxygen ; photocatalysis ; photocatalysts
    Language English
    Dates of publication 2021-0428
    Size p. 10217-10230.
    Publishing place The Royal Society of Chemistry
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/d1ta01379c
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Plasmonic Au nanoclusters dispersed in nitrogen-doped graphene as a robust photocatalyst for light-to-hydrogen conversion [Erratum: October 2021, v.9(41), p.23732]

    Van Dao, Dung / Cipriano, Luis A. / Di Liberto, Giovanni / Nguyen, Thuy T. D. / Ki, Sang-Woo / Son, Hoki / Kim, Gyu-Cheol / Lee, Kang Hyun / Yang, Jin-Kyu / Yu, Yeon-Tae / Pacchioni, Gianfranco / Lee, In-Hwan

    Journal of materials chemistry A. 2021 Oct. 19, v. 9, no. 40

    2021  

    Abstract: Supported plasmonic Au nanoclusters (NCs) consisting of a few tens of atoms can potentially offer great advantages for the light-driven hydrogen evolution reaction (HER). Here, we report on the synthesis of well-dispersed and stable plasmonic Au NCs of 0. ...

    Abstract Supported plasmonic Au nanoclusters (NCs) consisting of a few tens of atoms can potentially offer great advantages for the light-driven hydrogen evolution reaction (HER). Here, we report on the synthesis of well-dispersed and stable plasmonic Au NCs of 0.5–1.0 nm size on nitrogen-doped high surface area graphene (N-Gr) via freeze-drying and pyrolyzing in argon. The Au NCs/N-Gr photocatalyst exhibits under visible-light an impressive HER achievement (3.16 μmol mgcₐₜ⁻¹ h⁻¹) compared to Au single atoms/N-Gr (2.06 μmol mgcₐₜ⁻¹ h⁻¹) and Au nanoparticles (20 nm size)/N-Gr (0.92 μmol mgcₐₜ⁻¹ h⁻¹), with a maximum apparent quantum yield of 14.30%. These performances are synergistically attributed to two effects: (a) the strong surface plasmon resonance stimulated by light absorption and transferred near the surface of Au NCs, where the N-Gr conductive support can prolong the plasmon-produced hot electrons and direct the light-to-hydrogen conversion; (b) a high catalytic efficiency of Au NCs/N-Gr nanocomposites.
    Keywords absorption ; catalytic activity ; freeze drying ; graphene ; hydrogen production ; nanocomposites ; nanogold ; photocatalysts ; surface area ; surface plasmon resonance
    Language English
    Dates of publication 2021-1019
    Size p. 22810-22819.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 2702232-8
    ISSN 2050-7496 ; 2050-7488
    ISSN (online) 2050-7496
    ISSN 2050-7488
    DOI 10.1039/d1ta05445g
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Persistent airway obstruction after virus infection is not associated with airway inflammation.

    Wood, Lisa G / Powell, Heather / Grissell, Terry / Nguyen, Thuy T D / Shafren, Darren / Hensley, Michael / Gibson, Peter G

    Chest

    2007  Volume 131, Issue 2, Page(s) 415–423

    Abstract: Background: This study examined the contribution of airway inflammation to the delayed lung function recovery that occurs in some people following virus-induced asthma exacerbations.: Methods: Subjects (n = 40) were recruited at hospital admission ... ...

    Abstract Background: This study examined the contribution of airway inflammation to the delayed lung function recovery that occurs in some people following virus-induced asthma exacerbations.
    Methods: Subjects (n = 40) were recruited at hospital admission for acute asthma exacerbation. Respiratory virus infection was diagnosed by viral nucleic acid detection and/or cell culture, using induced sputum, nasal, or throat swabs. Data collected included lung function, answers to common cold and asthma control questionnaires, and induced sputum cellular profiles. Subjects were reexamined 4 to 6 weeks postexacerbation and were compared with stable asthmatic subjects (n = 26) who had been recruited from ambulatory care clinics.
    Results: Persistent airway obstruction, defined as lung function improvement at follow-up (ie, change in FEV1 percent predicted [Delta%FEV1]) of <15%, was observed in 10 subjects (25%). Airway recovery (Delta%FEV1, > or = 15%) was observed in the remaining subjects (30 subjects; 75%). During the acute episode, the airway-recovery group had increased total cell count (p = 0.019), increased number of neutrophils (p = 0.005), and increased percentage of neutrophils (p = 0.0043) compared to the group of stable subjects with asthma. Postexacerbation, the airway-recovery group had reduced numbers of neutrophils and an increased percentage of eosinophils. In contrast, during exacerbation, subjects with persistent airway obstruction showed no differences in inflammatory cell counts compared to stable subjects with asthma, nor did cell counts change postexacerbation. Symptoms improved in both groups postexacerbation. However, in the persistent-airway-obstruction group, asthma remained uncontrolled.
    Conclusion: Persistent airway obstruction and uncontrolled asthma are observed in some people after viral asthma exacerbations. These abnormalities are not associated with inflammatory cell influx into the airway lining fluid during the exacerbation and may reflect the involvement of noncellular elements. Further work should explore other mechanisms leading to incomplete airway recovery.
    MeSH term(s) Adolescent ; Adult ; Airway Obstruction/pathology ; Airway Obstruction/physiopathology ; Airway Obstruction/virology ; Asthma/pathology ; Asthma/physiopathology ; Asthma/virology ; Case-Control Studies ; Cell Count ; Child ; Female ; Follow-Up Studies ; Forced Expiratory Volume/physiology ; Humans ; Lung/pathology ; Lung/physiopathology ; Male ; Middle Aged ; Recovery of Function/physiology ; Respiratory Tract Infections/pathology ; Respiratory Tract Infections/physiopathology ; Respiratory Tract Infections/virology
    Keywords covid19
    Language English
    Publishing date 2007-01-23
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1032552-9
    ISSN 1931-3543 ; 0012-3692
    ISSN (online) 1931-3543
    ISSN 0012-3692
    DOI 10.1378/chest.06-1062
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Ui III Zs.45: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
    ab Jg. 2022: Lesesaal (EG)
    Zs.MO 349: Show issues

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