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Korell L, Lauterbach S, Timm J, Wang L, Mellin M, Kundmann A, Wu Q, Tian C, Marschall R, Hofmann JP, Osterloh FE, Einert M. On the structural evolution of nanoporous optically transparent CuO photocathodes upon calcination for photoelectrochemical applications. NANOSCALE ADVANCES 2024; 6:2875-2891. [PMID: 38817433 PMCID: PMC11134239 DOI: 10.1039/d4na00199k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Accepted: 04/11/2024] [Indexed: 06/01/2024]
Abstract
Copper oxides are promising photocathode materials for solar hydrogen production due to their narrow optical band gap energy allowing broad visible light absorption. However, they suffer from severe photocorrosion upon illumination, mainly due to copper reduction. Nanostructuring has been proven to enhance the photoresponse of CuO photocathodes; however, there is a lack of precise structural control on the nanoscale upon sol-gel synthesis and calcination for achieving optically transparent CuO thin film photoabsorbers. In this study, nanoporous and nanocrystalline CuO networks were prepared by a soft-templating and dip-coating method utilizing poly(ethylene oxide)-block-poly(propylene oxide)-block-poly(ethylene oxide) (Pluronic® F-127) as a structure-directing agent, resulting for the first-time in uniformly structured, crack-free, and optically transparent CuO thin films. The photoelectrochemical properties of the nanoporous CuO frameworks were investigated as a function of the calcination temperature and film thickness, revealing important information about the photocurrent, photostability, and photovoltage. Based on surface photovoltage spectroscopy (SPV), the films are p-type and generate up to 60 mV photovoltage at 2.0 eV (0.050 mW cm-2) irradiation for the film annealed at 750 °C. For these high annealing temperatures, the nanocrystalline domains in the thin film structure are more developed, resulting in improved electronic quality. In aqueous electrolytes with or without methyl viologen (as a fast electron acceptor), CuO films show cathodic photocurrents of up to -2.4 mA cm-2 at 0.32 V vs. RHE (air mass (AM) 1.5). However, the photocurrents were found to be entirely due to photocorrosion of the films and decay to near zero over the course of 20 min under AM 1.5 illumination. These fundamental results on the structural and morphological development upon calcination provide a direction and show the necessity for further (surface) treatment of sol-gel derived CuO photocathodes for photoelectrochemical applications. The study demonstrates how to control the size of nanopores starting from mesopore formation at 400 °C to the evolution of macroporous frameworks at 750 °C.
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Affiliation(s)
- Lukas Korell
- Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt Otto-Berndt-Straße 3 64287 Darmstadt Germany
| | - Stefan Lauterbach
- Institute for Applied Geosciences, Geomaterial Science, Technical University of Darmstadt Schnittspahnstraße 9 64287 Darmstadt Germany
| | - Jana Timm
- Department of Chemistry, University of Bayreuth Universitätsstraße 30 95447 Bayreuth Germany
| | - Li Wang
- Department of Chemistry, University of California One Shields Avenue Davis CA 95616 USA
| | - Maximilian Mellin
- Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt Otto-Berndt-Straße 3 64287 Darmstadt Germany
| | - Anna Kundmann
- Department of Chemistry, University of California One Shields Avenue Davis CA 95616 USA
| | - Qingyang Wu
- Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt Otto-Berndt-Straße 3 64287 Darmstadt Germany
| | - Chuanmu Tian
- Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt Otto-Berndt-Straße 3 64287 Darmstadt Germany
| | - Roland Marschall
- Department of Chemistry, University of Bayreuth Universitätsstraße 30 95447 Bayreuth Germany
| | - Jan P Hofmann
- Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt Otto-Berndt-Straße 3 64287 Darmstadt Germany
| | - Frank E Osterloh
- Department of Chemistry, University of California One Shields Avenue Davis CA 95616 USA
| | - Marcus Einert
- Surface Science Laboratory, Department of Materials and Earth Sciences, Technical University of Darmstadt Otto-Berndt-Straße 3 64287 Darmstadt Germany
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2
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Dastider A, Saha H, Anik MJF, Jamal M, Billah MM. Second phase Cu 2O boosted photocatalytic activity of fluorine doped CuO nanoparticles. RSC Adv 2024; 14:11677-11693. [PMID: 38605896 PMCID: PMC11007595 DOI: 10.1039/d3ra08790e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Accepted: 03/30/2024] [Indexed: 04/13/2024] Open
Abstract
The photocatalytic activity of fluorine (F) doped CuO nanoparticles (NPs) prepared employing modified sol-gel process was investigated here in this study. Structural and elemental characterization using XRD and XPS data confirmed successful incorporation of F as dopant. F doping led to lattice distortion and reduced crystallinity with smaller crystallite size while promoting the emergence of Cu2O as the second phase. Morphological analysis showed irregularly shaped, fused particles with a decreasing particle size trend upon doping. Addition of hydrogen peroxide generated hydroxyl radicals (OH˙) under ultra-violet (UV) light, which effectively degrades pollutants by facilitating the photocatalytic kinetics. Photocatalytic activity of all the nanoparticles was examined against Rhodamine B (Rh B) dye and most efficient degradation (97.78%) was observed for 3 mol% F dopant concentration. The emergence of Cu2O phase for doping beyond 1 mol% F doped CuO might be the prime reason to enhance its degradation performance. Conversely, 5 mol% doping caused notable phase changes and decreased degradation rate (88.05%) due to increased recombination rate in presence of metallic copper. The ability of F doped CuO nanoparticles to disintegrate organic contaminants by producing reactive oxygen species when exposed to UV light suggests their potential effectiveness in applications such as dye degradation, water purification, and environmental sustainability.
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Affiliation(s)
- Ankita Dastider
- Department of Materials and Metallurgical Engineering (MME), Bangladesh University of Engineering and Technology (BUET) Dhaka-1000 Bangladesh
| | - Hridoy Saha
- Department of Materials and Metallurgical Engineering (MME), Bangladesh University of Engineering and Technology (BUET) Dhaka-1000 Bangladesh
| | - Md Jannatul Ferdous Anik
- Department of Materials and Metallurgical Engineering (MME), Bangladesh University of Engineering and Technology (BUET) Dhaka-1000 Bangladesh
| | - Moniruzzaman Jamal
- Department of Materials and Metallurgical Engineering (MME), Bangladesh University of Engineering and Technology (BUET) Dhaka-1000 Bangladesh
- Department of Materials Science and Engineering, University of California Berkeley CA 94720 USA
| | - Md Muktadir Billah
- Department of Materials and Metallurgical Engineering (MME), Bangladesh University of Engineering and Technology (BUET) Dhaka-1000 Bangladesh
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3
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Adamu A, Isaacs M, Boodhoo K, Abegão FR. Investigation of Cu/TiO2 synthesis methods and conditions for CO2 photocatalytic reduction via conversion of bicarbonate/carbonate to formate. J CO2 UTIL 2023. [DOI: 10.1016/j.jcou.2023.102428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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4
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Photoelectrochemical Conversion of Sewage Water into H2 Fuel over the CuFeO2/CuO/Cu Composite Electrode. Catalysts 2023. [DOI: 10.3390/catal13030456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023] Open
Abstract
This study describes the synthesis of delafossite, CuFeO2, as a primary photocatalytic material for hydrogen generation. A photoelectrode, CuFeO2/CuO/Cu, was prepared by combusting a Cu foil dipped in FeCl3 in ambient air. This photoelectrode showed excellent optical behavior for the hydrogen generation reaction from sewage water, producing 90 µmol/h of H2. The chemical structure was confirmed through XRD and XPS analyses, and the crystalline rhombohedral shape of CuFeO2 was confirmed using SEM and TEM analyses. With a bandgap of 1.35 ev, the prepared material displayed excellent optical properties. Electrochemical measurements for H2 gas generation were carried out using the CuFeO2/CuO/Cu photoelectrode, comparing the effect of light and dark and monochromatic wavelength light. The electrode exhibited significant enhancement in light compared to dark, with current density (Jph) values of −0.83 and −0.1 mA·cm−2, respectively. The monochromatic light also had a noticeable effect, with the Jph value increasing from −0.45 to −0.79 mA·cm−2 as the wavelength increased from 640 to 390 nm. This system is cheap and durable, making it a promising solution for hydrogen gas fuel generation in the industry.
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5
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Cosma D, Urda A, Radu T, Rosu MC, Mihet M, Socaci C. Evaluation of the Photocatalytic Properties of Copper Oxides/Graphene/TiO2 Nanoparticles Composites. Molecules 2022; 27:molecules27185803. [PMID: 36144538 PMCID: PMC9502858 DOI: 10.3390/molecules27185803] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 08/24/2022] [Accepted: 09/02/2022] [Indexed: 11/16/2022] Open
Abstract
Easy and cost-efficient modifications of titanium dioxide nanoparticles that improve their efficiency in the visible light domain represent a continuous and challenging research topic. In addition, the effect of graphene on the overall photocatalytic process is still debated. Consequently, herein, we prepared a series of TiO2 nanoparticle-based composites with different copper oxide mass content (1–3%) and co-doped with graphene of different oxidation degrees. Different characterization techniques were used to analyze the structural and physico-chemical properties of the obtained composites: Scanning Electron Microscopy (SEM)/Transmission Electron Microscopy (TEM)/Energy-dispersive X-ray spectroscopy (EDX) analysis, X-ray powder diffraction (XRD), Fourier-transformed infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The photocatalytic performance was evaluated by the degradation of methylene blue under both UVA and visible light irradiation. The nanocomposites show very good photocatalytic activity independent of the presence of reduced graphene oxide, due to the Cu2O/CuO-TiO2 heterojunctions. This finding has been confirmed by the very efficient visible-light-driven degradation of amoxicillin and ciprofloxacin.
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Affiliation(s)
- Dragos Cosma
- National Institute for Research and Development of Isotopic and Molecular Technologies—INCDTIM, 67-103 Donat Street, 400293 Cluj-Napoca, Romania
| | - Alexandra Urda
- National Institute for Research and Development of Isotopic and Molecular Technologies—INCDTIM, 67-103 Donat Street, 400293 Cluj-Napoca, Romania
- Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, 11 Arany Janos Street, 400028 Cluj-Napoca, Romania
| | - Teodora Radu
- National Institute for Research and Development of Isotopic and Molecular Technologies—INCDTIM, 67-103 Donat Street, 400293 Cluj-Napoca, Romania
| | - Marcela C. Rosu
- National Institute for Research and Development of Isotopic and Molecular Technologies—INCDTIM, 67-103 Donat Street, 400293 Cluj-Napoca, Romania
| | - Maria Mihet
- National Institute for Research and Development of Isotopic and Molecular Technologies—INCDTIM, 67-103 Donat Street, 400293 Cluj-Napoca, Romania
| | - Crina Socaci
- National Institute for Research and Development of Isotopic and Molecular Technologies—INCDTIM, 67-103 Donat Street, 400293 Cluj-Napoca, Romania
- Correspondence:
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6
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Shao J, Lan X, Zhang C, Cao C, Yu Y. Recent advances in soot combustion catalysts with designed micro-structures. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.08.057] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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7
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Converting Sewage Water into H 2 Fuel Gas Using Cu/CuO Nanoporous Photocatalytic Electrodes. MATERIALS 2022; 15:ma15041489. [PMID: 35208029 PMCID: PMC8879772 DOI: 10.3390/ma15041489] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 02/05/2022] [Accepted: 02/10/2022] [Indexed: 11/17/2022]
Abstract
This work reports on H2 fuel generation from sewage water using Cu/CuO nanoporous (NP) electrodes. This is a novel concept for converting contaminated water into H2 fuel. The preparation of Cu/CuO NP was achieved using a simple thermal combustion process of Cu metallic foil at 550 °C for 1 h. The Cu/CuO surface consists of island-like structures, with an inter-distance of 100 nm. Each island has a highly porous surface with a pore diameter of about 250 nm. X-ray diffraction (XRD) confirmed the formation of monoclinic Cu/CuO NP material with a crystallite size of 89 nm. The prepared Cu/CuO photoelectrode was applied for H2 generation from sewage water achieving an incident to photon conversion efficiency (IPCE) of 14.6%. Further, the effects of light intensity and wavelength on the photoelectrode performance were assessed. The current density (Jph) value increased from 2.17 to 4.7 mA·cm-2 upon raising the light power density from 50 to 100 mW·cm-2. Moreover, the enthalpy (ΔH*) and entropy (ΔS*) values of Cu/CuO electrode were determined as 9.519 KJ mol-1 and 180.4 JK-1·mol-1, respectively. The results obtained in the present study are very promising for solving the problem of energy in far regions by converting sewage water to H2 fuel.
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8
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Hayashida K, Tsuda Y, Yamada T, Yoshigoe A, Okada M. Revisit of XPS Studies of Supersonic O 2 Molecular Adsorption on Cu(111): Copper Oxides. ACS OMEGA 2021; 6:26814-26820. [PMID: 34661036 PMCID: PMC8515815 DOI: 10.1021/acsomega.1c04663] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 09/20/2021] [Indexed: 06/08/2023]
Abstract
We report the X-ray photoemission spectroscopy (XPS) characterization of the bulk Cu2O(111) surface and "8" and "29" oxide structures on Cu(111) prepared using a 0.5 eV O2 supersonic molecular beam. We propose a new structural model for the "8" oxide structure and also confirm the previously proposed model for the "29" oxide structure on Cu(111), based on the O 1s XPS spectra. The detection angle dependence of the O 1s spectra supports that the nanopyramidal model is more preferable for the (√3 × √3)R30° Cu2O(111). We also report electronic excitations that O 1s electrons suffer.
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Affiliation(s)
- Koki Hayashida
- Department
of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Yasutaka Tsuda
- Materials
Sciences Research Center, Japan Atomic Energy
Agency, Sayo-gun, Hyogo 679-5148, Japan
| | - Takashi Yamada
- Department
of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
| | - Akitaka Yoshigoe
- Materials
Sciences Research Center, Japan Atomic Energy
Agency, Sayo-gun, Hyogo 679-5148, Japan
| | - Michio Okada
- Department
of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
- Institute
for Radiation Sciences, Osaka University, Toyonaka, Osaka 560-0043, Japan
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9
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Siavash Moakhar R, Hosseini-Hosseinabad SM, Masudy-Panah S, Seza A, Jalali M, Fallah-Arani H, Dabir F, Gholipour S, Abdi Y, Bagheri-Hariri M, Riahi-Noori N, Lim YF, Hagfeldt A, Saliba M. Photoelectrochemical Water-Splitting Using CuO-Based Electrodes for Hydrogen Production: A Review. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2007285. [PMID: 34117806 DOI: 10.1002/adma.202007285] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Revised: 12/25/2020] [Indexed: 06/12/2023]
Abstract
The cost-effective, robust, and efficient electrocatalysts for photoelectrochemical (PEC) water-splitting has been extensively studied over the past decade to address a solution for the energy crisis. The interesting physicochemical properties of CuO have introduced this promising photocathodic material among the few photocatalysts with a narrow bandgap. This photocatalyst has a high activity for the PEC hydrogen evolution reaction (HER) under simulated sunlight irradiation. Here, the recent advancements of CuO-based photoelectrodes, including undoped CuO, doped CuO, and CuO composites, in the PEC water-splitting field, are comprehensively studied. Moreover, the synthesis methods, characterization, and fundamental factors of each classification are discussed in detail. Apart from the exclusive characteristics of CuO-based photoelectrodes, the PEC properties of CuO/2D materials, as groups of the growing nanocomposites in photocurrent-generating devices, are discussed in separate sections. Regarding the particular attention paid to the CuO heterostructure photocathodes, the PEC water splitting application is reviewed and the properties of each group such as electronic structures, defects, bandgap, and hierarchical structures are critically assessed.
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Affiliation(s)
- Roozbeh Siavash Moakhar
- Department of Bioengineering, McGill University, Montreal, QC, H3A 0E9, Canada
- Non-Metallic Materials Research Group, Niroo Research Institute (NRI), Tehran, 14686-13113, Iran
| | | | - Saeid Masudy-Panah
- Electrical and Computer Engineering, National University of Singapore, Singapore, 119260, Singapore
- Low Energy Electronic Systems (LEES), Singapore-MIT Alliance for Research and Technology (SMART) Centre, Singapore, 38602, Singapore
| | - Ashkan Seza
- Non-Metallic Materials Research Group, Niroo Research Institute (NRI), Tehran, 14686-13113, Iran
- Department of Materials Science and Engineering, Sharif University of Technology, Azadi Ave, Tehran, 11155-9466, Iran
| | - Mahsa Jalali
- Department of Bioengineering, McGill University, Montreal, QC, H3A 0E9, Canada
| | - Hesam Fallah-Arani
- Non-Metallic Materials Research Group, Niroo Research Institute (NRI), Tehran, 14686-13113, Iran
| | - Fatemeh Dabir
- Non-Metallic Materials Research Group, Niroo Research Institute (NRI), Tehran, 14686-13113, Iran
| | - Somayeh Gholipour
- Nanophysics Research Laboratory, Department of Physics, University of Tehran, Tehran, 14395-547, Iran
| | - Yaser Abdi
- Nanophysics Research Laboratory, Department of Physics, University of Tehran, Tehran, 14395-547, Iran
| | - Mohiedin Bagheri-Hariri
- Institute for Corrosion and Multiphase flow Technology, Department of Chemical and Biomedical Engineering, Ohio University, Athens, OH, 45701, USA
| | - Nastaran Riahi-Noori
- Non-Metallic Materials Research Group, Niroo Research Institute (NRI), Tehran, 14686-13113, Iran
| | - Yee-Fun Lim
- Institute of Materials Research and Engineering, Agency for Science Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
| | - Anders Hagfeldt
- Laboratory of Photomolecular Science, Ecole Polytechnique Fédérale de Lausanne, EPFL SB-ISIC-LSPM, Station 6, Lausanne, 1015, Switzerland
| | - Michael Saliba
- Institute for Photovoltaics, University of Stuttgart, Pfaffenwaldring 47, D-70569, Stuttgart, Germany
- Helmholtz Young Investigator Group FRONTRUNNER IEK5-Photovoltaik, Forschungszentrum, D-52425, Jülich, Germany
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10
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Li CX, Huang RT, Shi XY. Microbial synthesis of Cu 7S 4/rGO nanocomposites with efficient photocatalytic activity for the degradation of methyl green. CrystEngComm 2021. [DOI: 10.1039/d0ce01641a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cu7S4/reduced graphene oxide (rGO) photocatalysts are attracting increasing interest because of their low cost and environmental friendliness.
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Affiliation(s)
- Chun-Xiao Li
- Anhui Province Key Laboratory of Wetland Ecosystem Protection and Restoration
- School of Resource and Environmental Engineering
- Anhui University
- Hefei 230601
- China
| | - Ru-Ting Huang
- Anhui Province Key Laboratory of Wetland Ecosystem Protection and Restoration
- School of Resource and Environmental Engineering
- Anhui University
- Hefei 230601
- China
| | - Xian-Yang Shi
- Anhui Province Key Laboratory of Wetland Ecosystem Protection and Restoration
- School of Resource and Environmental Engineering
- Anhui University
- Hefei 230601
- China
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11
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Yang Z, Kang T, Ji Y, Li J, Zhu Y, Liu H, Jiang X, Zhong Z, Su F. Architectural Cu 2O@CuO mesocrystals as superior catalyst for trichlorosilane synthesis. J Colloid Interface Sci 2020; 589:198-207. [PMID: 33472146 DOI: 10.1016/j.jcis.2020.12.069] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 12/14/2020] [Accepted: 12/21/2020] [Indexed: 11/27/2022]
Abstract
As compared with conventional nanocrystal systems, Cu-based mesocrystals have demonstrated distinct advantages in catalytic applications. Here, we report the preparation of a novel architectural Cu2O@CuO catalyst system integrated with the core/shell and mesocrystal structures (Cu2O@CuO MC) via a facile solvothermal process followed by calcination. The formation mechanism of the Cu2O@CuO MC with hexapod morphology was deciphered based on a series of time-dependent experiments and characterizations. When applied as a Cu-based catalyst to produce trichlorosilane (TCS) via Si hydrochlorination reaction, the Cu2O@CuO MC exhibited a much higher Si conversion, TCS selectivity, and stability than the catalyst-free industrial process and the Cu2O@CuO catalyst with a core-shell nanostructure. The enhanced catalytic efficiency of the former is attributed to the collective effects from its quite rough surface for providing abundant adsorption sites, the ordered nanoparticle arrangement in the core and shell for generating strong synergistic effects, and the micrometer size for the improved structural stability. This work demonstrates a practical route for designing sophisticated architectural structures that combine several structural functions within one catalyst system and their catalysis applications.
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Affiliation(s)
- Zhibin Yang
- School of Metallurgy and Materials Engineering, Jiangsu University of Science and Technology, Zhangjiagang, Changxinzhong Road 8, Zhangjiagang 215600, China
| | - Ting Kang
- School of Metallurgy and Materials Engineering, Jiangsu University of Science and Technology, Zhangjiagang, Changxinzhong Road 8, Zhangjiagang 215600, China; State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Yongjun Ji
- School of Light Industry, Beijing Technology and Business University, Beijing 100048, China.
| | - Jing Li
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Yongxia Zhu
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Hezhi Liu
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Xingyu Jiang
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
| | - Ziyi Zhong
- College of Engineering, Guangdong Technion-Israel Institute of Technology (GTIIT), 241 Daxue Road, Shantou 515063, China; Technion-Israel Institute of Technology (IIT), Haifa 32000, Israel
| | - Fabing Su
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; Institute of Industrial Chemistry and Energy Technology, Shenyang University of Chemical Technology, Shenyang 110142, China.
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12
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Kampmann J, Betzler S, Hajiyani H, Häringer S, Beetz M, Harzer T, Kraus J, Lotsch BV, Scheu C, Pentcheva R, Fattakhova-Rohlfing D, Bein T. How photocorrosion can trick you: a detailed study on low-bandgap Li doped CuO photocathodes for solar hydrogen production. NANOSCALE 2020; 12:7766-7775. [PMID: 32215409 DOI: 10.1039/c9nr10250g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The efficiency of photoelectrochemical tandem cells is still limited by the availability of stable low band gap electrodes. In this work, we report a photocathode based on lithium doped copper(ii) oxide, a black p-type semiconductor. Density functional theory calculations with a Hubbard U term show that low concentrations of Li (Li0.03Cu0.97O) lead to an upward shift of the valence band maximum that crosses the Fermi level and results in a p-type semiconductor. Therefore, Li doping emerged as a suitable approach to manipulate the electronic structure of copper oxide based photocathodes. As this material class suffers from instability in water under operating conditions, the recorded photocurrents are repeatedly misinterpreted as hydrogen evolution evidence. We investigated the photocorrosion behavior of LixCu1-xO cathodes in detail and give the first mechanistic study of the fundamental physical process. The reduced copper oxide species were localized by electron energy loss spectroscopy mapping. Cu2O grows as distinct crystallites on the surface of LixCu1-xO instead of forming a dense layer. Additionally, there is no obvious Cu2O gradient inside the films, as Cu2O seems to form on all LixCu1-xO nanocrystals exposed to water. The application of a thin Ti0.8Nb0.2Ox coating by atomic layer deposition and the deposition of a platinum co-catalyst increased the stability of LixCu1-xO against decomposition. These devices showed a stable hydrogen evolution for 15 minutes.
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Affiliation(s)
- Jonathan Kampmann
- Department of Chemistry and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Butenandtstr. 5-13 (E), 81377 Munich, Germany.
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13
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Farjood M, Zanjanchi MA. A new synthesis methodology for SiO 2 gel-based nanostructures and their application for elimination of dye pollutants. NEW J CHEM 2020. [DOI: 10.1039/d0nj00093k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A new procedure for preparation of a high specific surface area silica-based nanostructure and its copper-containing active photocatalyst is described.
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Affiliation(s)
- Mehrdad Farjood
- Department of Chemistry
- Faculty of Science
- University of Guilan
- Rasht 41335-1914
- Iran
| | - M. A. Zanjanchi
- Department of Chemistry
- Faculty of Science
- University of Guilan
- Rasht 41335-1914
- Iran
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14
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An S, Joshi B, Yarin AL, Swihart MT, Yoon SS. Supersonic Cold Spraying for Energy and Environmental Applications: One-Step Scalable Coating Technology for Advanced Micro- and Nanotextured Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1905028. [PMID: 31747097 PMCID: PMC6980375 DOI: 10.1002/adma.201905028] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2019] [Revised: 09/09/2019] [Indexed: 05/17/2023]
Abstract
Supersonic cold spraying is an emerging technique for rapid deposition of films of materials including micrometer-size and sub-micrometer metal particles, nanoscale ceramic particles, clays, polymers, hybrid materials composed of polymers and particulates, reduced graphene oxide (rGO), and metal-organic frameworks. In this method, particles are accelerated to a high velocity and then impact a substrate at near ambient temperature, where dissipation of their kinetic energy produces strong adhesion. Here, recent progress in fundamentals and applications of cold spraying is reviewed. High-velocity impact with the substrate results in significant deformation, which not only produces adhesion, but can change the particles' internal structure. Cold-sprayed coatings can also exhibit micro- and nanotextured morphologies not achievable by other means. Suspending micro- or nanoparticles in a liquid and cold-spraying the suspension produces fine atomization and even deposition of materials that could not otherwise be processed. The scalability and low cost of this method and its compatibility with roll-to-roll processing make it promising for many applications, including ultrathin flexible materials, solar cells, touch-screen panels, nanotextured surfaces for enhanced heat transfer, thermal and electrical insulation films, transparent conductive films, materials for energy storage (e.g., Li-ion battery electrodes), heaters, sensors, photoelectrodes for water splitting, water purification membranes, and self-cleaning films.
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Affiliation(s)
- Seongpil An
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL, 60607-7022, USA
| | - Bhavana Joshi
- Department of Physics, NES Science College, Snehnagar, Nanded, 431605, Maharashtra, India
| | - Alexander L Yarin
- Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL, 60607-7022, USA
| | - Mark T Swihart
- Department of Chemical and Biological Engineering and RENEW Institute, University at Buffalo, The State University of New York, Buffalo, NY, 14260-4200, USA
| | - Sam S Yoon
- School of Mechanical Engineering, Korea University, Seoul, 02841, Republic of Korea
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15
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Jiang Q, Jiang J, Deng R, Xie X, Meng J. Controllable preparation of CuO/Cu 2O composite particles with enhanced photocatalytic performance. NEW J CHEM 2020. [DOI: 10.1039/d0nj00090f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spherical CuO/Cu2O nanocomposites synthesized in PEG-400 have excellent catalytic activity because of transferring photogenerated electrons from Cu2O to CuO.
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Affiliation(s)
- Qing Jiang
- Department of Chemistry
- Jinan University
- Guangzhou 510632
- China
| | - Jiajie Jiang
- Department of Chemistry
- Jinan University
- Guangzhou 510632
- China
| | - Runkang Deng
- Department of Chemistry
- Jinan University
- Guangzhou 510632
- China
| | - Xinyuan Xie
- Department of Chemistry
- Jinan University
- Guangzhou 510632
- China
| | - Jianxin Meng
- Department of Chemistry
- Jinan University
- Guangzhou 510632
- China
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16
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Study of Transition Metal Ion Doped CdS Nanoparticles for Removal of Dye from Textile Wastewater. J Inorg Organomet Polym Mater 2019. [DOI: 10.1007/s10904-019-01343-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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The study of Fe-doped CdS nanoparticle-assisted photocatalytic degradation of organic dye in wastewater. APPLIED NANOSCIENCE 2019. [DOI: 10.1007/s13204-018-0933-3] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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18
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Xia W, Luo M, Zeng X, Yang J, Dong J, Xu Q, Zhang Z. Different Annealing Atmosphere Gases on the Growth and Photocurrent Performance of CuO Films Grown on FTO Substrate. ACS OMEGA 2018; 3:11354-11361. [PMID: 31459243 PMCID: PMC6645067 DOI: 10.1021/acsomega.8b01529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Accepted: 09/10/2018] [Indexed: 06/10/2023]
Abstract
Improvement in photocurrent performance remains the key subject to prepare a stable and efficient photocathode in photoelectrochemical cell (PEC) water splitting. Different to the ordinary methods, various annealing atmosphere gases were used to study the growth of CuO films on fluorine-doped tin oxide substrate; then, the photocurrent performance was studied when those CuO films were used as photocathodes in PEC. The scanning electron microscopy images indicate that all of the CuO films are composed of vertically arrayed CuO nanosheets, each individual nanosheet with a thickness of 100-500 nm. Those hierarchical CuO photoelectrodes in the PEC exhibit quite different photoelectrochemical activities in visible light, where the air-annealed CuO film has nearly 6 times enhancement in photocurrent (108 μA) at 0 V compared to that of film under oxygen atmosphere, and 34 times of argon. It has an acceptor concentration of 2.9 × 1021 cm-3 from Mott-Schottky analysis, which is more than 2 times larger than that of the oxygen-annealed CuO film, and 37 times larger than that of the argon-annealed film. Ultraviolet photoelectron spectroscopy measurements were carried out to explain the improved photocurrent performance of the air-annealed CuO films, where the obtained valence band of 0.44 eV and work function of 4.92 eV well match the reduction reaction of electrolyte (H2O).
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Affiliation(s)
- Weiwei Xia
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology and College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
| | - Min Luo
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology and College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
| | - Xianghua Zeng
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology and College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
| | - Jinpeng Yang
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology and College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
| | - Jing Dong
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology and College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
| | - Qin Xu
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology and College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
| | - Zhenxin Zhang
- College
of Physics Science and Technology & Institute of Optoelectronic
Technology and College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
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19
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O'Neel-Judy É, Nicholls D, Castañeda J, Gibbs JG. Light-Activated, Multi-Semiconductor Hybrid Microswimmers. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1801860. [PMID: 29995334 DOI: 10.1002/smll.201801860] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 05/28/2018] [Indexed: 05/28/2023]
Abstract
Using a dynamic fabrication process, hybrid, photoactivated microswimmers made from two different semiconductors, titanium dioxide (TiO2 ) and cuprous oxide (Cu2 O) are developed, where each material occupies a distinct portion of the multiconstituent particles. Structured light-activated microswimmers made from only TiO2 or Cu2 O are observed to be driven in hydrogen peroxide and water most vigorously under UV or blue light, respectively, whereas hybrid structures made from both of these materials exhibit wavelength-dependent modes of motion due to the disparate responses of each photocatalyst. It is also found that the hybrid particles are activated in water alone, a behavior which is not observed in those made from a single semiconductor, and thus, the system may open up a new class of fuel-free photoactive colloids that take advantage of semiconductor heterojunctions. The TiO2 /Cu2 O hybrid microswimmer presented here is but an example of a broader method for inducing different modes of motion in a single light-activated particle, which is not limited to the specific geometries and materials presented in this study.
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Affiliation(s)
- Étude O'Neel-Judy
- Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ, 86011, USA
| | - Dylan Nicholls
- Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ, 86011, USA
| | - John Castañeda
- Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ, 86011, USA
| | - John G Gibbs
- Department of Physics and Astronomy, Northern Arizona University, Flagstaff, AZ, 86011, USA
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20
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Karthikeyan S, Kumar S, Durndell LJ, Isaacs MA, Parlett CMA, Coulson B, Douthwaite RE, Jiang Z, Wilson K, Lee AF. Size-Dependent Visible Light Photocatalytic Performance of Cu2
O Nanocubes. ChemCatChem 2018. [DOI: 10.1002/cctc.201800439] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Sekar Karthikeyan
- European Bioenergy Research Institute; Aston University; Aston Triangle Birmingham B4 7ET UK
| | - Santosh Kumar
- Department of Chemical Engineering; University of Bath; Bath BA2 7AY UK
| | - Lee J. Durndell
- European Bioenergy Research Institute; Aston University; Aston Triangle Birmingham B4 7ET UK
| | - Mark A. Isaacs
- European Bioenergy Research Institute; Aston University; Aston Triangle Birmingham B4 7ET UK
| | | | - Ben Coulson
- Department of Chemistry; University of York; York YO10 5DD UK
| | | | - Zhi Jiang
- Research Center for Combustion and Environment Technology; Shanghai Jiao Tong University; Shanghai P.R. China
| | - Karen Wilson
- School of Science; RMIT University; Melbourne VIC 3001 Australia
| | - Adam F. Lee
- School of Science; RMIT University; Melbourne VIC 3001 Australia
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21
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Kwon J, Cho H, Jung J, Lee H, Hong S, Yeo J, Han S, Ko SH. ZnO/CuO/M (M = Ag, Au) Hierarchical Nanostructure by Successive Photoreduction Process for Solar Hydrogen Generation. NANOMATERIALS 2018; 8:nano8050323. [PMID: 29757225 PMCID: PMC5977337 DOI: 10.3390/nano8050323] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Revised: 05/10/2018] [Accepted: 05/10/2018] [Indexed: 11/24/2022]
Abstract
To date, solar energy generation devices have been widely studied to meet a clean and sustainable energy source. Among them, water splitting photoelectrochemical cell is regarded as a promising energy generation way for splitting water molecules and generating hydrogen by sunlight. While many nanostructured metal oxides are considered as a candidate, most of them have an improper bandgap structure lowering energy transition efficiency. Herein, we introduce a novel wet-based, successive photoreduction process that can improve charge transfer efficiency by surface plasmon effect for a solar-driven water splitting device. The proposed process enables to fabricate ZnO/CuO/Ag or ZnO/CuO/Au hierarchical nanostructure, having an enhanced electrical, optical, photoelectrochemical property. The fabricated hierarchical nanostructures are demonstrated as a photocathode in the photoelectrochemical cell and characterized by using various analytic tools.
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Affiliation(s)
- Jinhyeong Kwon
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea.
| | - Hyunmin Cho
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea.
| | - Jinwook Jung
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea.
| | - Habeom Lee
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea.
| | - Sukjoon Hong
- Department of Mechanical Engineering, Hanyang University, 55 Hanyangdaehak-ro, Sangnok-gu, Ansan Gyeonggi-do 15588, Korea.
| | - Junyeob Yeo
- Novel Applied Nano Optics (NANO) Lab, Department of Physics, Kyungpook National University, 80 Daehak-ro, Bukgu, Daegu 41566, Korea.
| | - Seungyong Han
- Department of Mechanical Engineering, Ajou University, 206 Worldcupro, Yeongtong-gu, Suwon 16499, Korea.
| | - Seung Hwan Ko
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea.
- Department of Mechanical Engineering/Institute of Advanced Machinery and Design (SNU-IAMD), Seoul National University, Gwanak-ro, Gwanak-gu, Seoul 08826, Korea.
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22
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Singh M, Jampaiah D, Kandjani AE, Sabri YM, Della Gaspera E, Reineck P, Judd M, Langley J, Cox N, van Embden J, Mayes ELH, Gibson BC, Bhargava SK, Ramanathan R, Bansal V. Oxygen-deficient photostable Cu 2O for enhanced visible light photocatalytic activity. NANOSCALE 2018. [PMID: 29543296 DOI: 10.1039/c7nr08388b] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Oxygen vacancies in inorganic semiconductors play an important role in reducing electron-hole recombination, which may have important implications in photocatalysis. Cuprous oxide (Cu2O), a visible light active p-type semiconductor, is a promising photocatalyst. However, the synthesis of photostable Cu2O enriched with oxygen defects remains a challenge. We report a simple method for the gram-scale synthesis of highly photostable Cu2O nanoparticles by the hydrolysis of a Cu(i)-triethylamine [Cu(i)-TEA] complex at low temperature. The oxygen vacancies in these Cu2O nanoparticles led to a significant increase in the lifetimes of photogenerated charge carriers upon excitation with visible light. This, in combination with a suitable energy band structure, allowed Cu2O nanoparticles to exhibit outstanding photoactivity in visible light through the generation of electron-mediated hydroxyl (OH˙) radicals. This study highlights the significance of oxygen defects in enhancing the photocatalytic performance of promising semiconductor photocatalysts.
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Affiliation(s)
- Mandeep Singh
- Ian Potter NanoBioSensing Facility, NanoBiotechnology Research Laboratory, School of Science, RMIT University, Melbourne, VIC 3000, Australia.
| | - Deshetti Jampaiah
- Ian Potter NanoBioSensing Facility, NanoBiotechnology Research Laboratory, School of Science, RMIT University, Melbourne, VIC 3000, Australia.
| | - Ahmad E Kandjani
- Centre for Advanced Materials and Industrial Chemistry, School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | - Ylias M Sabri
- Centre for Advanced Materials and Industrial Chemistry, School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | | | - Philipp Reineck
- ARC Centre of Excellence for Nanoscale BioPhotonics, School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | - Martyna Judd
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Julien Langley
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Nicholas Cox
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
| | - Joel van Embden
- School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | - Edwin L H Mayes
- RMIT Microscopy and Microanalysis Facility (RMMF), RMIT University, Melbourne, VIC 3000, Australia
| | - Brant C Gibson
- ARC Centre of Excellence for Nanoscale BioPhotonics, School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | - Suresh K Bhargava
- Centre for Advanced Materials and Industrial Chemistry, School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | - Rajesh Ramanathan
- Ian Potter NanoBioSensing Facility, NanoBiotechnology Research Laboratory, School of Science, RMIT University, Melbourne, VIC 3000, Australia.
| | - Vipul Bansal
- Ian Potter NanoBioSensing Facility, NanoBiotechnology Research Laboratory, School of Science, RMIT University, Melbourne, VIC 3000, Australia.
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23
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Lu L, Xu X, Yan J, Shi FN, Huo Y. Oxygen vacancy rich Cu 2O based composite material with nitrogen doped carbon as matrix for photocatalytic H 2 production and organic pollutant removal. Dalton Trans 2018; 47:2031-2038. [PMID: 29349461 DOI: 10.1039/c7dt03835f] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A nitrogen doped carbon matrix supported Cu2O composite material (Cu/Cu2O@NC) was fabricated successfully with a coordination polymer as precursor through calcination. In this composite material, Cu2O particles with a size of about 6-10 nm were dispersed evenly in the nitrogen doped carbon matrix. After calcination, some coordinated nitrogen atoms were doped in the lattice of Cu2O and replace oxygen atoms, thus generating a large number of oxygen vacancies. In Cu/Cu2O@NC, the existence of oxygen vacancies has been confirmed by electron spin resonance (ESR) and X-ray photoelectron spectroscopy (XPS). Under visible light irradiation, Cu/Cu2O@NC exhibits excellent H2 production with the rate of 379.6 μmol h-1 g-1. Its photocatalytic activity affects organic dyes, such as Rhodamine B (RhB) and methyl orange (MO). In addition to photocatalysis, Cu/Cu2O@NC also exhibits striking catalytic activity in reductive conversion of 4-nitrophenol to 4-aminophenol with in presence of sodium borohydride (NaBH4). The conversion efficiency reaches almost 100% in 250 s with the quantity of Cu/Cu2O@NC as low as 5 mg. The outstanding H2 production and organic pollutants removal are attributed to the oxygen vacancy. We expect that Cu/Cu2O@NC will find its way as a new resource for hydrogen energy as well as a promising material in water purification.
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Affiliation(s)
- Lele Lu
- Department of Chemistry, College of Science, Northeast University, Shenyang, 110819, P.R. China.
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24
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Li Y, Cao X, Zhan L, Xue J, Wang J, Xiong C, Nie Z. Hot electron transfer promotes ion production in plasmonic metal nanostructure assisted laser desorption ionization mass spectrometry. Chem Commun (Camb) 2018; 54:10905-10908. [DOI: 10.1039/c8cc05793a] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Experimental evidences are shown that hot electron transfer in LSPR plays a key role in ionizing molecules during laser desorption ionization process.
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Affiliation(s)
- Yafeng Li
- College of Chemical Engineering
- Jiujiang University
- Jiujiang
- China
- Beijing National Laboratory for Molecular Sciences
| | - Xiaohua Cao
- College of Chemical Engineering
- Jiujiang University
- Jiujiang
- China
| | - Lingpeng Zhan
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory for Analytical Chemistry for Living Biosystems
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing
| | - Jingjuan Xue
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory for Analytical Chemistry for Living Biosystems
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing
| | - Jiyun Wang
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory for Analytical Chemistry for Living Biosystems
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing
| | - Caiqiao Xiong
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory for Analytical Chemistry for Living Biosystems
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing
| | - Zongxiu Nie
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory for Analytical Chemistry for Living Biosystems
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing
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25
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Fu W, Li G, Wang Y, Zeng S, Yan Z, Wang J, Xin S, Zhang L, Wu S, Zhang Z. Facile formation of mesoporous structured mixed-phase (anatase/rutile) TiO2 with enhanced visible light photocatalytic activity. Chem Commun (Camb) 2018; 54:58-61. [DOI: 10.1039/c7cc05750d] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new mesoporous anatase/rutile TiO2 nanocomposite was synthesized at a lower calcination temperature, and exhibited a higher visible light photocatalytic activity.
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Affiliation(s)
- Weiwei Fu
- Experimental Center
- Shenyang Normal University
- Shenyang 110034
- China
- State Key Laboratory of Inorganic Synthesis & Preparative Chemistry
| | - Guode Li
- Experimental Center
- Shenyang Normal University
- Shenyang 110034
- China
| | - Yu Wang
- State Key Laboratory of Inorganic Synthesis & Preparative Chemistry
- Jilin University
- Changchun 130012
- China
| | - Shangjing Zeng
- Key Laboratory of Synthetic Rubber
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130012
- China
| | - Zhuojun Yan
- College of Chemistry
- Liaoning University
- Shenyang 110036
- P. R. China
| | - Junwei Wang
- Experimental Center
- Shenyang Normal University
- Shenyang 110034
- China
| | - Shigang Xin
- Experimental Center
- Shenyang Normal University
- Shenyang 110034
- China
| | - Lei Zhang
- Experimental Center
- Shenyang Normal University
- Shenyang 110034
- China
| | - Shiwei Wu
- Experimental Center
- Shenyang Normal University
- Shenyang 110034
- China
| | - Zongtao Zhang
- State Key Laboratory of Inorganic Synthesis & Preparative Chemistry
- Jilin University
- Changchun 130012
- China
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26
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Jampaiah D, Velisoju VK, Venkataswamy P, Coyle VE, Nafady A, Reddy BM, Bhargava SK. Nanowire Morphology of Mono- and Bidoped α-MnO 2 Catalysts for Remarkable Enhancement in Soot Oxidation. ACS APPLIED MATERIALS & INTERFACES 2017; 9:32652-32666. [PMID: 28862428 DOI: 10.1021/acsami.7b07656] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In the present work, nanowire morphologies of α-MnO2, cobalt monodoped α-MnO2, Cu and Co bidoped α-MnO2, and Ni and Co bidoped α-MnO2 samples were prepared by a facile hydrothermal synthesis. The structural, morphological, surface, and redox properties of all the as-prepared samples were investigated by various characterization techniques, namely, scanning electron microscopy (SEM), transmission and high resolution electron microscopy (TEM and HR-TEM), powder X-ray diffraction (XRD), N2 sorption surface area measurements, X-ray photoelectron spectroscopy (XPS), hydrogen-temperature-programmed reduction (H2-TPR), and oxygen-temperature-programmed desorption (O2-TPD). The soot oxidation performance was found to be significantly improved via metal mono- and bidoping. In particular, Cu and Co bidoped α-MnO2 nanowires showed a remarkable improvement in soot oxidation performance, with its T50 (50% soot conversion) values of 279 and 431 °C under tight and loose contact conditions, respectively. The soot combustion activation energy for the Cu and Co bidoped MnO2 nanowires is 121 kJ/mol. The increased oxygen vacancies, greater number of active sites, facile redox behavior, and strong synergistic interaction were the key factors for the excellent catalytic activity. The longevity of Cu and Co bidoped α-MnO2 nanowires was analyzed, and it was found that the Cu/Co bidoped α-MnO2 nanowires were highly stable after five successive cycles and showed an insignificant decrease in soot oxidation activity. Furthermore, the HR-TEM analysis of a spent catalyst after five cycles indicated that the (310) crystal plane of α-MnO2 interacts with the soot particles; therefore, we can assume that more-reactive exposed surfaces positively affect the reaction of soot oxidation. Thus, the Cu and Co bidoped α-MnO2 nanowires provide promise as a highly effective alternative to precious metal based automotive catalysts.
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Affiliation(s)
- Deshetti Jampaiah
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University , GPO BOX 2476, Melbourne, Victoria 3001, Australia
| | - Vijay Kumar Velisoju
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University , GPO BOX 2476, Melbourne, Victoria 3001, Australia
- Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology , Uppal Road, Hyderabad 500 007, India
| | | | - Victoria E Coyle
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University , GPO BOX 2476, Melbourne, Victoria 3001, Australia
| | - Ayman Nafady
- Department of Chemistry, College of Science, King Saud University , Riyadh 11451, Saudi Arabia
| | - Benjaram M Reddy
- Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology , Uppal Road, Hyderabad 500 007, India
| | - Suresh K Bhargava
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University , GPO BOX 2476, Melbourne, Victoria 3001, Australia
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27
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Deng X, Wang C, Yang H, Shao M, Zhang S, Wang X, Ding M, Huang J, Xu X. One-pot hydrothermal synthesis of CdS decorated CuS microflower-like structures for enhanced photocatalytic properties. Sci Rep 2017; 7:3877. [PMID: 28634397 PMCID: PMC5478623 DOI: 10.1038/s41598-017-04270-y] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 05/10/2017] [Indexed: 11/09/2022] Open
Abstract
CdS decorated CuS structures have been controllably synthesized through a one-pot hydrothermal method. The morphologies and compositions of the as-prepared samples could be concurrently well controlled by simply tuning the amount of CdCl2 and thiourea. Using this strategy, the morphology of the products experienced from messy to flower-like morphologies with multiple porous densities, together with the phase evolution from pure CuS to the CdS/CuS composites. Serving as a photocatalyst, the samples synthesized with the addition of 1 mmol cadmium chloride and 3 mmol thiourea during synthetic process, showed the best photocatalytic activity, which could reach a maximum photocatalytic efficiency of 93% for methyl orange (MO) photodegradation after 150 min. The possible mechanism for the high photocatalytic efficiency of the sample was proposed by investigating the composition, surface area, structure, and morphology before and after photocatalytic reaction.
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Affiliation(s)
- Xiaolong Deng
- School of Physics and Technology, University of Jinan, 336 Nanxin Zhuang West Road, Jinan, 250022, Shandong Province, People's Republic of China
| | - Chenggang Wang
- School of Physics and Technology, University of Jinan, 336 Nanxin Zhuang West Road, Jinan, 250022, Shandong Province, People's Republic of China
| | - Hongcen Yang
- School of Physics and Technology, University of Jinan, 336 Nanxin Zhuang West Road, Jinan, 250022, Shandong Province, People's Republic of China
| | - Minghui Shao
- School of Physics and Technology, University of Jinan, 336 Nanxin Zhuang West Road, Jinan, 250022, Shandong Province, People's Republic of China
| | - Shouwei Zhang
- School of Physics and Technology, University of Jinan, 336 Nanxin Zhuang West Road, Jinan, 250022, Shandong Province, People's Republic of China
| | - Xiao Wang
- School of Physics and Technology, University of Jinan, 336 Nanxin Zhuang West Road, Jinan, 250022, Shandong Province, People's Republic of China
| | - Meng Ding
- School of Physics and Technology, University of Jinan, 336 Nanxin Zhuang West Road, Jinan, 250022, Shandong Province, People's Republic of China
| | - Jinzhao Huang
- School of Physics and Technology, University of Jinan, 336 Nanxin Zhuang West Road, Jinan, 250022, Shandong Province, People's Republic of China.
| | - Xijin Xu
- School of Physics and Technology, University of Jinan, 336 Nanxin Zhuang West Road, Jinan, 250022, Shandong Province, People's Republic of China.
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28
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Einert M, Weller T, Leichtweiß T, Smarsly BM, Marschall R. Electrospun CuO Nanofibers: Stable Nanostructures for Solar Water Splitting. CHEMPHOTOCHEM 2017. [DOI: 10.1002/cptc.201700050] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Marcus Einert
- Institute of Physical Chemistry; Justus Liebig University Giessen; 35392 Giessen Germany
| | - Tobias Weller
- Institute of Physical Chemistry; Justus Liebig University Giessen; 35392 Giessen Germany
| | - Thomas Leichtweiß
- Center for Materials Research (LaMa); Justus Liebig University Giessen; 35392 Giessen Germany
| | - Bernd M. Smarsly
- Institute of Physical Chemistry; Justus Liebig University Giessen; 35392 Giessen Germany
| | - Roland Marschall
- Institute of Physical Chemistry; Justus Liebig University Giessen; 35392 Giessen Germany
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29
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Lakhotiya G, Bajaj S, Nayak AK, Pradhan D, Tekade P, Rana A. Enhanced catalytic activity without the use of an external light source using microwave-synthesized CuO nanopetals. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2017; 8:1167-1173. [PMID: 28685117 PMCID: PMC5480358 DOI: 10.3762/bjnano.8.118] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 04/25/2017] [Indexed: 06/07/2023]
Abstract
We report enhanced catalytic activity of CuO nanopetals synthesized by microwave-assisted wet chemical synthesis. The catalytic reaction of CuO nanopetals and H2O2 was studied with the application of external light source and also under dark conditions for the degradation of the hazardous dye methylene blue. The CuO nanopetals showed significant catalytic activity for the fast degradation of methylene blue and rhodamine B (RhB) under dark conditions, without the application of an external light source. This increased catalytic activity was attributed to the co-operative role of H2O2 and the large specific surface area (≈40 m2·g-1) of the nanopetals. We propose a detail mechanism for this fast degradation. A separate study of the effect of different H2O2 concentrations for the degradation of methylene blue under dark conditions is also illustrated.
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Affiliation(s)
- Govinda Lakhotiya
- Material Science Center, Indian Institute of Technology Kharagpur, Kharagpur-721302, W.B., India
- Jankidevi Bajaj College of Science, Wardha-442001, M.S., India
| | - Sonal Bajaj
- Jankidevi Bajaj College of Science, Wardha-442001, M.S., India
| | - Arpan Kumar Nayak
- Material Science Center, Indian Institute of Technology Kharagpur, Kharagpur-721302, W.B., India
| | - Debabrata Pradhan
- Material Science Center, Indian Institute of Technology Kharagpur, Kharagpur-721302, W.B., India
| | - Pradip Tekade
- Jankidevi Bajaj College of Science, Wardha-442001, M.S., India
| | - Abhimanyu Rana
- MESA+ Institute for Nanotechnology, University of Twente, 7500 AE, Enschede, Netherlands
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30
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Ingram W, Larson S, Carlson D, Zhao Y. Ag-Cu mixed phase plasmonic nanostructures fabricated by shadow nanosphere lithography and glancing angle co-deposition. NANOTECHNOLOGY 2017; 28:015301. [PMID: 27897147 DOI: 10.1088/0957-4484/28/1/015301] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
By combining shadow nanosphere lithography with a glancing angle co-deposition technique, mixed-phase Ag-Cu triangular nanopatterns and films were fabricated. They were prepared at different compositions with respect to Ag from 100% to 0% by changing the relative deposition ratio of each metal. Characterizations by ellipsometry, energy dispersive x-ray spectroscopy, and x-ray diffraction revealed that the thin films and nanopatterns were composed of small, well-mixed Ag and Cu nano-grains with a diameter less than 20 nm, and their optical properties could be described by an effective medium theory. All compositions of the nanopattern had the same shape, but showed tunable localized surface plasmon resonance (LSPR) properties. In general, the LSPR of the nanopatterns redshifted with decreasing composition. Such a relation could be fitted by an empirical model based on the bulk theory of alloy plasmonics. By changing the colloidal template and the material deposited, this fabrication technique can be used to produce other alloy plasmonic nanostructures with predicted LSPR wavelengths.
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Affiliation(s)
- Whitney Ingram
- Department of Physics and Astronomy, University of Georgia, Athens, GA 30602, USA
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31
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Deng X, Wang C, Shao M, Xu X, Huang J. Low-temperature solution synthesis of CuO/Cu2O nanostructures for enhanced photocatalytic activity with added H2O2: synergistic effect and mechanism insight. RSC Adv 2017. [DOI: 10.1039/c6ra27634b] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The morphological transformation was observed after photodegradation and the as-grown samples exhibited relatively good durability as photocatalysts.
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Affiliation(s)
- Xiaolong Deng
- School of Physics and Technology
- University of Jinan
- Jinan
- People's Republic of China
| | - Chenggang Wang
- School of Physics and Technology
- University of Jinan
- Jinan
- People's Republic of China
| | - Minghui Shao
- School of Physics and Technology
- University of Jinan
- Jinan
- People's Republic of China
| | - Xijin Xu
- School of Physics and Technology
- University of Jinan
- Jinan
- People's Republic of China
| | - Jinzhao Huang
- School of Physics and Technology
- University of Jinan
- Jinan
- People's Republic of China
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32
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Ingram W, He Y, Stone K, Dennis WM, Ye D, Zhao Y. Tuning the plasmonic properties of silver nanopatterns fabricated by shadow nanosphere lithography. NANOTECHNOLOGY 2016; 27:385301. [PMID: 27518233 DOI: 10.1088/0957-4484/27/38/385301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Regular silver (Ag) nanopatterns, from disconnected nanotriangles to well coupled triangular clusters of nanoparticles, were prepared by shadow nanosphere lithography at different incident angles θ from 0° to 20° with continuous azimuthal rotation. The resulting nanopatterns were consistent with predictions by numerical calculations and Monte Carlo simulations of adatoms with high diffusivity. The visible localized surface plasmon resonance of these nanopatterns was tuned by θ systematically due to the change in size, shape, and arrangement of Ag nanopatterns. These resonances were consistent with finite-difference time-domain simulations using realistic nanopatterns based upon scanning electron micrographs. Such a simple fabrication strategy can be used to optimize surface enhanced Raman scattering substrate fabrication, as well as other plasmonics based applications.
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Affiliation(s)
- Whitney Ingram
- Department of Physics and Astronomy, and Nanoscale Science and Engineering Center, University of Georgia, Athens, GA 30602, USA
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33
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Ma Y, Li X, Yang Z, Xu S, Zhang W, Su Y, Hu N, Lu W, Feng J, Zhang Y. Morphology Control and Photocatalysis Enhancement by in Situ Hybridization of Cuprous Oxide with Nitrogen-Doped Carbon Quantum Dots. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:9418-27. [PMID: 27571475 DOI: 10.1021/acs.langmuir.6b02011] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Cuprous oxide (Cu2O) is an attractive photocatalyst because of its visible-light-driven photocatalytic behavior, abundance, low toxicity, and environmental compatibility. However, its short electron diffusion length and low hole mobility result in low photocatalytic efficiency, which hinders its wider applications. Herein, we report an in situ method to introduce nitrogen-doped carbon dots (N-CDs) into Cu2O frameworks. It is interestingly found that the introduction of N-CDs drives the morphology of N-CDs/Cu2O to evolve from rough cube to sphere, and the most encouraging result is that all of the obtained N-CDs/Cu2O composites exhibit better photocatalytic activities than pure Cu2O cubes. The optimal N-CDs/Cu2O photocatalyst is synthesized with 10 mL of N-CDs solution, which shows the best degradation ability (100%, 70 min), far superior to pure Cu2O cubes (∼5%, 70 min) and P25 (∼10%, 70 min). Beside the photodegradation of methyl orange, N-CDs/Cu2O(10) composites also exhibit excellent photocatalytic activities in the photodegradation of methyl blue and rhodamine B. It is demonstrated that the excellent photocatalytic performance of N-CDs/Cu2O composites can be attributed to the highly roughened structure and the suppression of electron-hole recombination as a result of the introduction of N-CDs. These findings demonstrate that the conjugation of CDs is a promising method to improve the photocatalytic activities for traditional semiconductors.
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Affiliation(s)
- Yujie Ma
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering and ‡Transportation Research Center, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China
| | - Xiaolin Li
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering and ‡Transportation Research Center, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China
| | - Zhi Yang
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering and ‡Transportation Research Center, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China
| | - Shusheng Xu
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering and ‡Transportation Research Center, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China
| | - Wei Zhang
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering and ‡Transportation Research Center, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China
| | - Yanjie Su
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering and ‡Transportation Research Center, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China
| | - Nantao Hu
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering and ‡Transportation Research Center, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China
| | - Weijie Lu
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering and ‡Transportation Research Center, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China
| | - Jie Feng
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering and ‡Transportation Research Center, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China
| | - Yafei Zhang
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Department of Micro/Nano Electronics, School of Electronic Information and Electrical Engineering and ‡Transportation Research Center, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University , Shanghai 200240, P. R. China
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34
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Larson S, Huang W, Zhao Y. Combinatorial fabrication of composite nanorods using oblique angle co-deposition. NANOTECHNOLOGY 2016; 27:365304. [PMID: 27485759 DOI: 10.1088/0957-4484/27/36/365304] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We demonstrate that oblique angle co-deposition can be used as a versatile combinatory nanofabrication technique to generate a library of nanomaterials. Using the Cu-Fe2O3 system as an example, by carefully characterizing the vapor plumes of the source materials, a composition map can be generated, which is used to design the locations of all the substrate holders. The resulting nanostructures at different locations show different thickness, morphology, crystallinity, composition, as well as inhomogeneity in microstructures, and material maps of all these structural parameters are established. By further oxidizing or reducing the composite nanostructures, their properties-such as band gap, photocatalytic performance, and magnetic properties-can be easily linked to their composition and other structural parameters. Optimal materials for photocatalytic and magnetic applications are efficiently identified. It is expected that oblique angle co-deposition and its variations could become the most powerful combinatory nanofabrication technique for nanomaterial survey.
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Affiliation(s)
- Steven Larson
- Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602
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35
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Larson S, Zhao Y. Tuning the composition of Bi x W y O nanorods towards zero bias PEC water splitting. NANOTECHNOLOGY 2016; 27:255401. [PMID: 27181626 DOI: 10.1088/0957-4484/27/25/255401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A unique co-oblique angle deposition method was used to create nanorod arrays of mixed phase Bi2O3/WO3/Bi2WO6 with varying atomic ratios of Bi to W. The effect of the tuning on the resulting nanostructures was characterized by EDX, SEM, XRD, optical transmission, specular reflection, and diffuse reflection spectroscopy. Samples with different Bi:W atomic ratio had a wide range of morphology and composition due to the surface mobility of deposited bismuth and its volume expansion during oxidation. Their photocatalytic and photoelectrochemical properties were investigated by methylene blue degradation and photo-generated current respectively. The sample with 38 at.% Bi showed the highest photodecay rates as well as the maximum photocurrent density, 4.3 μA cm(-2), at a bias potential of 600 mV versus Ag/AgCl (3M KCl); while the sample with 50 at.% Bi exhibited a high photocurrent density of 0.35 μA cm(-2) at zero bias potential, which indicates that varying the composition and mixed crystal phases of different oxides with appropriate band gaps and locations could hold the key to a visible light driven, zero bias potential, photoelectrochemical cell.
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Affiliation(s)
- Steven Larson
- Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602, USA
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36
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Lee JG, Kim DY, Lee JH, Kim MW, An S, Jo HS, Nervi C, Al-Deyab SS, Swihart MT, Yoon SS. Scalable Binder-Free Supersonic Cold Spraying of Nanotextured Cupric Oxide (CuO) Films as Efficient Photocathodes. ACS APPLIED MATERIALS & INTERFACES 2016; 8:15406-15414. [PMID: 27232695 DOI: 10.1021/acsami.6b03968] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We demonstrate production of nanotextured p-type cupric oxide (CuO) films via a low-cost scalable supersonic cold spray method in open air conditions. Simply sweeping the spray nozzle across a substrate produced a large-scale CuO film. When used as hydrogen evolution photocathodes, these films produced photocurrent densities (PCD) of up to 3.1 mA/cm(2) under AM1.5 illumination, without the use of a cocatalyst or any additional heterojunction layers. Cu2O particles were supersonically sprayed onto an indium tin oxide (ITO) coated soda lime glass (SLG) substrate, without any solvent or binder. Annealing in air converted the Cu2O films to CuO, with a corresponding decrease in the bandgap and increase in the fraction of the solar spectrum absorbed. Annealing at 600 °C maximized the PCD. Increasing the supersonic gas velocity from ∼450 to ∼700 m/s produced denser films with greater surface roughness, in turn producing higher PCD. The nanoscale texture of the films, which resembles the skin of a dinosaur, enhanced their performance, leading to one of the highest PCD values in the literature. We characterized the films by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy, and transmission electron microscopy to elucidate the origins of their outstanding performance. This supersonic cold spraying deposition has the potential to be used on a commercial scale for low cost mass production.
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Affiliation(s)
- Jong Gun Lee
- School of Mechanical Engineering, Korea University , Seoul 136-713, Republic of Korea
| | - Do-Yeon Kim
- School of Mechanical Engineering, Korea University , Seoul 136-713, Republic of Korea
| | - Jong-Hyuk Lee
- School of Mechanical Engineering, Korea University , Seoul 136-713, Republic of Korea
| | - Min-Woo Kim
- School of Mechanical Engineering, Korea University , Seoul 136-713, Republic of Korea
| | - Seongpil An
- School of Mechanical Engineering, Korea University , Seoul 136-713, Republic of Korea
| | - Hong Seok Jo
- School of Mechanical Engineering, Korea University , Seoul 136-713, Republic of Korea
| | - Carlo Nervi
- Department of Chemistry, University of Torino , Via P. Giuria 7, 10125, Torino, Italy , and Consorzio Interuniversitario Reattivitá Chimica e Catalisi, Bari
| | - Salem S Al-Deyab
- Petrochemical Research Chair, Department of Chemistry, King Saud University , Riyadh 11451, Saudi Arabia
| | - Mark T Swihart
- Department of Chemical & Biological Engineering, University at Buffalo, The State University of New York , Buffalo, New York 14260-4200, United States
| | - Sam S Yoon
- School of Mechanical Engineering, Korea University , Seoul 136-713, Republic of Korea
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