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Sengupta S, Ambade SB, O'Keefe TL, Tawakalna F, Hedlund Orbeck JK, Hamers RJ, Feng ZV, Haynes CL, Rosenzweig Z. Colloidal stabilization of hydrophobic InSe 2D nanosheets in a model environmental aqueous solution and their impact on Shewanella oneidensis MR-1. ENVIRONMENTAL SCIENCE. NANO 2024; 11:627-636. [PMID: 38881831 PMCID: PMC11178355 DOI: 10.1039/d3en00382e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2024]
Abstract
Semiconductor InSe 2D nanomaterials have emerged as potential photoresponsive materials for broadly distributed photodetectors and wearable electronics technologies due to their high photoresponsivity and thermal stability. This paper addresses an environmental concern about the fate of InSe 2D nanosheets when disposed and released into the environment after use. Semiconducting materials are potentially reactive and often form environmentally damaging species, for example reactive oxygen and nitrogen species, when degraded. InSe nanosheets are prepared using a semi bottom-up approach which involves a reaction between indium and selenium precursors at elevated temperature in an oxygen-free environment to prevent oxidation. InSe nanosheets are formed as a stable intermediate with micrometer-sized lateral dimensions and a few monolayer thickness. The InSe 2D nanosheets are obtained when the reaction is stopped after 30 minutes by cooling. Keeping the reaction at elevated temperature for a longer period, for example 60 minutes leads to the formation of InSe 3D nanoparticles of about 5 nm in diameter, a thermodynamically more stable form of InSe. The paper focuses on the colloidal stabilization of InSe nanosheets in an aqueous solution that contains epigallocatechin gallate (EGCG), a natural organic matter (NOM) simulant. We show that EGCG coats the surface of the hydrophobic, water-insoluble InSe nanosheets via physisorption. The formed EGCG-coated InSe nanosheets are colloidally stable in aqueous solution. While unmodified semiconducting InSe nanosheets could produce reactive oxygen species (ROS) when illuminated, our study shows low levels of ROS generation by EGCG-coated InSe nanosheets under ambient light, which might be attributed to ROS quenching by EGCG. Growth-based viability (GBV) assays show that the colloidally stable EGCG-coated InSe nanosheets adversely impact the bacterial growth of Shewanella oneidensis MR-1, an environmentally relevant Gram-negative bacterium in aqueous media. The impact on bacterial growth is driven by the EGCG coating of the nanosheets. In addition, live/dead assays show insignificant membrane damage of the Shewanella oneidensis MR-1 cells by InSe nanosheets, suggesting a weak association of EGCG-coated nanosheets with the cells. It is likely that the adverse impact of EGCG-coated nanosheets on bacterial growth is the result of increasing local concentration of EGCG either when adsorbed on the nanosheets when the nanosheets interact with the cells, or when desorbed from the EGCG-coated nanosheets to interact with the bacterial cells.
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Affiliation(s)
- Shreyasi Sengupta
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County, Baltimore, MD 21250, USA
| | - Swapnil B Ambade
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County, Baltimore, MD 21250, USA
| | - Tana L O'Keefe
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, USA
| | - Falak Tawakalna
- Chemistry Department, Augsburg University, Minneapolis, Minnesota 55454, USA
| | | | - Robert J Hamers
- Department of Chemistry, University of Wisconsin Madison, Madison, Wisconsin 53706, USA
| | - Z Vivian Feng
- Chemistry Department, Augsburg University, Minneapolis, Minnesota 55454, USA
- Council on Science and Technology, Princeton University, Princeton, NJ 08544, USA
| | - Christy L Haynes
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, USA
| | - Zeev Rosenzweig
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County, Baltimore, MD 21250, USA
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Li Y, Tsang SCE. Unusual Catalytic Properties of High-Energetic-Facet Polar Metal Oxides. Acc Chem Res 2021; 54:366-378. [PMID: 33382242 DOI: 10.1021/acs.accounts.0c00641] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
ConspectusHeterogeneous catalysis is an area of great importance not only in chemical industries but also in energy conversion and environmental technologies. It is well-established that the specific surface morphology and structure of solid catalysts exert remarkable effects on catalytic performances, since most physical and chemical processes take place on the surface during catalytic reactions. Different from the widely studied faceted metallic nanoparticles, metal oxides give more complicated structures and surface features. Great progress has been achieved in controlling the shape and exposed facets of transition metal oxides during nanocrystal growth, usually by using surface-directing agents (SDAs). However, the effects of exposed facets remain controversial among researchers. It should be noted that high-energetic facets, especially polar facets, tend to lower their surface energy via different relaxation processes, such as surface reconstruction, redox change, adsorption of countercharged species, etc. These processes can subsequently lead to surface defect formation and break the surface stoichiometry, and the resulting changes in electronic configurations and charge migration properties all play important roles in heterogeneous catalysis. Because different materials prefer different relaxation methods, various surface features are created, and different techniques are required to investigate the different features from facet to facet. Conventional characterization techniques such as X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, etc. appear to be insufficient to elucidate the underlying principles of the facet effects. Consequently, an increasing number of novel techniques have been developed to differentiate the surface features, enabling greater understanding of the effects of facets on heterogeneous catalysis.In this Account, on the basis of previous studies by our own group, we will focus on the effects of tailored facets on heterogeneous catalysis introduced by engineered simple binary metal oxide nanomaterials primarily with exposed polar facets, in combination with detailed surface studies using a range of new characterization techniques. As a result, fundamental principles of the effects of facets are elucidated, and the structure-activity correlations are demonstrated. The surface features introduced by different relaxation processes are also investigated using a range of characterization techniques. For example, electron paramagnetic resonance spectroscopy is used to detect the oxygen vacancies, while probe-assisted solid-state NMR spectroscopy is shown to be facet-sensitive and able to evaluate the surface acidity. It is also shown that such different features influence the heterogeneous catalytic performances in different ways. With the help of first-principles density functional theory calculations, unique properties of the faceted metal oxides are discussed and unraveled. Besides, other materials such as transition metal chalcogenides and layered double hydroxides are also briefly discussed with regard to their application in facet-dependent catalysis studies.
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Affiliation(s)
- Yiyang Li
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
| | - Shik Chi Edman Tsang
- Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K
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Airo MA, Otieno F, Mxakaza L, Ipadeola A, Kadzutu-Sithole RS, Machogo-Phao LFE, Billing C, Moloto M, Moloto N. Probing the stoichiometry dependent catalytic activity of nickel selenide counter electrodes in the redox reaction of iodide/triiodide electrolyte in dye sensitized solar cells. RSC Adv 2020; 10:39509-39520. [PMID: 35515413 PMCID: PMC9057497 DOI: 10.1039/d0ra06150f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 10/04/2020] [Indexed: 12/28/2022] Open
Abstract
Nickel selenide (Ni x Se y ) systems have received much attention in recent years as potential low cost counter electrodes (CEs) in dye sensitized solar cells (DSSCs). Their electrocatalytic activities are comparable to that of the conventional platinum CE. Despite their achievements, the effect of stoichiometry on their catalytic performance as CEs in DSSCs still remains unclear, hence the motivation for this work. Different stoichiometries of Ni x Se y were synthesized via a colloidal method in oleylamine or oleylamine/oleic acid mixture at the appropriate synthetic temperature and Ni to Se precursor ratio. X-ray diffraction revealed that different stoichiometries of nickel selenide were formed namely, NiSe2, Ni3Se4, Ni0.85Se, NiSe and Ni3Se2. Scanning electron microscopy showed that all the stoichiometries had predominantly spherical-like morphologies. Cyclic voltammetry, electrochemical impedance spectroscopy analysis and the photovoltaic performances of the DSSCs fabricated using the different Ni x Se y CEs revealed that selenium rich stoichiometries performed better than the nickel rich ones. Consequently, the catalytic activity towards the redox reaction of the triiodide/iodide electrolyte and hence the power conversion efficiency (PCE) followed the order of NiSe2 > Ni3Se4 > Ni0.85Se > NiSe > Ni3Se2 with PCE values of 3.31%, 3.25%, 3.17%, 2.35% and 1.52% respectively under ambient conditions.
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Affiliation(s)
- Mildred A Airo
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand Private Bag 3, Wits 2050 Republic of South Africa +27 73 761 0875 +27 11 717 6774.,Department of Chemistry, Vaal University of Technology Private Bag X021 Vanderbijlpark 1900 Republic of South Africa
| | - Francis Otieno
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand Private Bag 3, Wits 2050 Republic of South Africa +27 73 761 0875 +27 11 717 6774.,Department of Physics, University of the Witwatersrand Private Bag 3, Wits 2050 Republic of South Africa
| | - Lineo Mxakaza
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand Private Bag 3, Wits 2050 Republic of South Africa +27 73 761 0875 +27 11 717 6774
| | - Adewale Ipadeola
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand Private Bag 3, Wits 2050 Republic of South Africa +27 73 761 0875 +27 11 717 6774
| | - Rudo S Kadzutu-Sithole
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand Private Bag 3, Wits 2050 Republic of South Africa +27 73 761 0875 +27 11 717 6774
| | - Lerato F E Machogo-Phao
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand Private Bag 3, Wits 2050 Republic of South Africa +27 73 761 0875 +27 11 717 6774.,Analytical Services Division, Mintek 200 Malibongwe Drive, Randburg South Africa
| | - Caren Billing
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand Private Bag 3, Wits 2050 Republic of South Africa +27 73 761 0875 +27 11 717 6774
| | - Makwena Moloto
- Department of Chemistry, Vaal University of Technology Private Bag X021 Vanderbijlpark 1900 Republic of South Africa
| | - Nosipho Moloto
- Molecular Science Institute, School of Chemistry, University of the Witwatersrand Private Bag 3, Wits 2050 Republic of South Africa +27 73 761 0875 +27 11 717 6774
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Mamedov RM. A New Way of Obtaining Ultrathin Films of Indium Selenide. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2020. [DOI: 10.1134/s0036024420060163] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Karmakar G, Tyagi A, Wadawale A, Kedarnath G, Srivastava A, Betty C, Singh V. Synthesis, Characterization and Photo Response Behaviour of InSe and CuInSe2
Nanostructures Using Tris(5-methyl-2-pyridylselenolato)indium(III) as Molecular Precursor. ChemistrySelect 2018. [DOI: 10.1002/slct.201801653] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Gourab Karmakar
- Chemistry Division; Bhabha Atomic Research Centre; Mumbai- 400 085 India
| | - Adish Tyagi
- Chemistry Division; Bhabha Atomic Research Centre; Mumbai- 400 085 India
- Homi Bhabha National Institute, Anushaktinagar; Mumbai- 400 094 India
| | - Amey Wadawale
- Chemistry Division; Bhabha Atomic Research Centre; Mumbai- 400 085 India
| | - Gotluru Kedarnath
- Chemistry Division; Bhabha Atomic Research Centre; Mumbai- 400 085 India
- Homi Bhabha National Institute, Anushaktinagar; Mumbai- 400 094 India
| | - Amit P. Srivastava
- Mechanical Metallurgy Division; Bhabha Atomic Research Centre; Mumbai- 400 085 India)
| | | | - Vishal Singh
- Materials Science Division; Bhabha Atomic Research Centre; Mumbai- 400 085 India)
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Huang W, Gan L, Li H, Ma Y, Zhai T. Phase‐Engineered Growth of Ultrathin InSe Flakes by Chemical Vapor Deposition for High‐Efficiency Second Harmonic Generation. Chemistry 2018; 24:15678-15684. [DOI: 10.1002/chem.201803634] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 07/16/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Wenjuan Huang
- State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering Huazhong University of, Science and Technology (HUST) Wuhan 430074 P. R. China
| | - Lin Gan
- State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering Huazhong University of, Science and Technology (HUST) Wuhan 430074 P. R. China
| | - Huiqiao Li
- State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering Huazhong University of, Science and Technology (HUST) Wuhan 430074 P. R. China
| | - Ying Ma
- State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering Huazhong University of, Science and Technology (HUST) Wuhan 430074 P. R. China
| | - Tianyou Zhai
- State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering Huazhong University of, Science and Technology (HUST) Wuhan 430074 P. R. China
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