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Size controlled Pt over mesoporous NiO nanocomposite catalysts: thermal catalysis vs. photocatalysis. JOURNAL OF POROUS MATERIALS 2021. [DOI: 10.1007/s10934-020-00978-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Gao W, Lei M, Li L, Wen D. Promoting the electrocatalytic properties of nickel aerogel by gold decoration for efficient electrocatalytic oxygen evolution in alkali. Chem Commun (Camb) 2020; 56:15446-15449. [PMID: 33236736 DOI: 10.1039/d0cc06337a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Decorating Au onto Ni aerogel via a one-step spontaneous gelation preserved the highly porous structure of Ni aerogel, and contributed to more active sites and enhanced intrinsic activity for water oxidation with low overpotential of 377 mV for the current density of 100 mA cm-2.
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Affiliation(s)
- Wei Gao
- State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, 710072, P. R. China.
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Gu F, Di M, Han D, Hong S, Wang Z. Atomically Dispersed Au on In 2O 3 Nanosheets for Highly Sensitive and Selective Detection of Formaldehyde. ACS Sens 2020; 5:2611-2619. [PMID: 32786391 DOI: 10.1021/acssensors.0c01074] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
As an important industrial chemical, formaldehyde is used in various fields but is harmful to health. Developing a convenient detection device for formaldehyde is significant. Based on atomically dispersed Au on In2O3 nanosheets, a formaldehyde sensor was fabricated in this work. The highly dispersed Au obtained by the ultraviolet (UV) light-assisted reduction method helps improve the sensing performance. A meager loading amount (0.01 wt %) of Au on In2O3 nanosheets exhibits high sensitivity toward ppb-level formaldehyde. Au acts as an electron sink and promotes the oxidation of formaldehyde. Atomically dispersed Au on In2O3 nanosheets decreases the activation energy and increases the number of active sites, which result in a highly efficient conversion of formaldehyde and a marked resistance change of the fabricated sensors. The selective adsorption and oxidation of formaldehyde on single atom Au's uniform sites establish excellent selectivity. Besides, the sensor exhibits short response/recovery time and excellent stability, with promising applications in formaldehyde detection.
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Affiliation(s)
- Fubo Gu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Mengyu Di
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Dongmei Han
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Song Hong
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Zhihua Wang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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Ochirkhuyag A, Sápi A, Szamosvölgyi Á, Kozma G, Kukovecz Á, Kónya Z. One-pot mechanochemical ball milling synthesis of the MnO x nanostructures as efficient catalysts for CO 2 hydrogenation reactions. Phys Chem Chem Phys 2020; 22:13999-14012. [PMID: 32555892 DOI: 10.1039/d0cp01855d] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here, we report on a one-pot mechanochemical ball milling synthesis of manganese oxide nanostructures synthesized at different milling speeds. The as-synthesized pure oxides and metal (Pt and Cu) doped oxides were tested in the hydrogenation of CO2 in the gas phase. Our study demonstrates the successful synthesis of the manganese oxide nanoparticles via mechano-chemical synthesis. We discovered that the milling speed could tune the crystal structure and the oxidation state of the manganese, which plays an essential role in the CO2 hydrogenation evidenced by ex situ XRD and XPS studies. The pure MnOx milled at 600 rpm showed high catalytic activity (∼20 000 nmol g-1 s-1) at 823 K, which can be attributed to the presence of Mn(ii) besides Mn(iii) and Mn(iv) on the surface under the reaction conditions. This study illustrates that the milling method is a cost-effective, simple way for the production of both pure, Pt-doped and Cu-loaded manganese nanocatalysts for heterogeneous catalytic reactions. Thus, we studied the Pt incorporation effect for the catalytic activity of MnOx using different Pt loading methods such as one-pot milling, wet impregnation and size-controlled 5 nm Pt loading via an ultrasonication-assisted method.
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Affiliation(s)
- Altantuya Ochirkhuyag
- University of Szeged, Interdisciplinary Excellence Centre, Department of Applied and Environmental Chemistry, H-6720, Rerrich Béla tér 1, Szeged, Hungary.
| | - András Sápi
- University of Szeged, Interdisciplinary Excellence Centre, Department of Applied and Environmental Chemistry, H-6720, Rerrich Béla tér 1, Szeged, Hungary. and Institute of Environmental and Technological Sciences, University of Szeged, H-6720, Szeged, Hungary
| | - Ákos Szamosvölgyi
- University of Szeged, Interdisciplinary Excellence Centre, Department of Applied and Environmental Chemistry, H-6720, Rerrich Béla tér 1, Szeged, Hungary.
| | - Gábor Kozma
- University of Szeged, Interdisciplinary Excellence Centre, Department of Applied and Environmental Chemistry, H-6720, Rerrich Béla tér 1, Szeged, Hungary.
| | - Ákos Kukovecz
- University of Szeged, Interdisciplinary Excellence Centre, Department of Applied and Environmental Chemistry, H-6720, Rerrich Béla tér 1, Szeged, Hungary. and MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, University of Szeged, H-6720 Szeged, Rerrich Béla tér 1, Szeged, Hungary
| | - Zoltán Kónya
- University of Szeged, Interdisciplinary Excellence Centre, Department of Applied and Environmental Chemistry, H-6720, Rerrich Béla tér 1, Szeged, Hungary. and MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, University of Szeged, H-6720 Szeged, Rerrich Béla tér 1, Szeged, Hungary
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Montoro Bustos AR, Pettibone JM, Murphy KE. Characterization of Nanoparticles: Advances. NANOPARTICLE DESIGN AND CHARACTERIZATION FOR CATALYTIC APPLICATIONS IN SUSTAINABLE CHEMISTRY 2019. [DOI: 10.1039/9781788016292-00037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Over the past two decades, the unique properties of engineered nanoparticles (NPs) have placed them at the centre of revolutionary advancements in many sectors of science, technology and commerce. Multi-technique and multi-disciplinary analytical approaches are required to identify, quantify, and characterize the chemical composition, size and size distribution, surface properties and the number and concentration of NPs. In this chapter, an overview of the recent advances in the characterization of NPs will be presented.
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Affiliation(s)
- A. R. Montoro Bustos
- National Institute of Standards and Technology 100 Bureau Drive Gaithersburg MD 20899-1070 USA
| | - J. M. Pettibone
- National Institute of Standards and Technology 100 Bureau Drive Gaithersburg MD 20899-1070 USA
| | - K. E. Murphy
- National Institute of Standards and Technology 100 Bureau Drive Gaithersburg MD 20899-1070 USA
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Sápi A, Halasi G, Kiss J, Dobó DG, Juhász KL, Kolcsár VJ, Ferencz Z, Vári G, Matolin V, Erdőhelyi A, Kukovecz Á, Kónya Z. In Situ DRIFTS and NAP-XPS Exploration of the Complexity of CO2 Hydrogenation over Size-Controlled Pt Nanoparticles Supported on Mesoporous NiO. THE JOURNAL OF PHYSICAL CHEMISTRY C 2018. [DOI: 10.1021/acs.jpcc.8b00061] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | - Vladimír Matolin
- Surface Physics Group, Charles University in Prague, Praha
8, CZ-180 00 Libeň, Czech Republic
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Sápi A, Kéri A, Kálomista I, Dobó DG, Ákos Szamosvölgyi ÁS, Juhász KL, Ákos Kukovecz ÁK, Kónya Z, Galbács G. Determination of the platinum concentration of a Pt/silica nanocomposite decorated with ultra small Pt nanoparticles using single particle inductively coupled plasma mass spectrometry. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY 2017. [DOI: 10.1039/c7ja00039a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The accurate load concentration of ultra small nanoparticles in a Pt/SiO2 nanocomposite is determined by the novel spICP-MS analytical method.
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Affiliation(s)
- András Sápi
- Department of Applied and Environmental Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
| | - Albert Kéri
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
| | - Ildikó Kálomista
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
| | - Dorina G. Dobó
- Department of Applied and Environmental Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
| | | | - Koppány L. Juhász
- Department of Applied and Environmental Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
| | - Ákos Kukovecz Ákos Kukovecz
- Department of Applied and Environmental Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
- MTA-SZTE “Lendület” Porous Nanocomposites Research Group
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group
| | - Gábor Galbács
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
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