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Rodríguez-Torres LM, Huerta-Miranda GA, Martínez-García AL, Mazón-Montijo DA, Hernández-Eligio A, Miranda-Hernández M, Juárez K. Influence of support materials on the electroactive behavior, structure and gene expression of wild type and GSU1771-deficient mutant of Geobacter sulfurreducens biofilms. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024:10.1007/s11356-024-33612-3. [PMID: 38758442 DOI: 10.1007/s11356-024-33612-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 05/05/2024] [Indexed: 05/18/2024]
Abstract
Geobacter sulfurreducens DL1 is a metal-reducing dissimilatory bacterium frequently used to produce electricity in bioelectrochemical systems (BES). The biofilm formed on electrodes is one of the most important factors for efficient electron transfer; this is possible due to the production of type IV pili and c-type cytochromes that allow it to carry out extracellular electron transfer (EET) to final acceptors. In this study, we analyzed the biofilm formed on different support materials (glass, hematite (Fe2O3) on glass, fluorine-doped tin oxide (FTO) semiconductor glass, Fe2O3 on FTO, graphite, and stainless steel) by G. sulfurreducens DL1 (WT) and GSU1771-deficient strain mutant (Δgsu1771). GSU1771 is a transcriptional regulator that controls the expression of several genes involved in electron transfer. Different approaches and experimental tests were carried out with the biofilms grown on the different support materials including structure analysis by confocal laser scanning microscopy (CLSM), characterization of electrochemical activity, and quantification of relative gene expression by RT-qPCR. The gene expression of selected genes involved in EET was analyzed, observing an overexpression of pgcA, omcS, omcM, and omcF from Δgsu1771 biofilms compared to those from WT, also the overexpression of the epsH gene, which is involved in exopolysaccharide synthesis. Although we observed that for the Δgsu1771 mutant strain, the associated redox processes are similar to the WT strain, and more current is produced, we think that this could be associated with a higher relative expression of certain genes involved in EET and in the production of exopolysaccharides despite the chemical environment where the biofilm develops. This study supports that G. sulfurreducens is capable of adapting to the electrochemical environment where it grows.
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Affiliation(s)
- Luis Miguel Rodríguez-Torres
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001. Col. Chamilpa, 62210, Cuernavaca, Morelos, México
| | - Guillermo Antonio Huerta-Miranda
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001. Col. Chamilpa, 62210, Cuernavaca, Morelos, México
| | - Ana Luisa Martínez-García
- Centro de Investigación en Materiales Avanzados S. C., Subsede Monterrey, Grupo de Investigación DORA-Lab, 66628, Apodaca, N. L, México
- Centro de Investigación e Innovación Tecnológica (CIIT), Grupo de Investigación DORA-Lab, Tecnológico Nacional de México Campus Nuevo León (TECNL), 66629, Apodaca, N. L, México
| | - Dalia Alejandra Mazón-Montijo
- Centro de Investigación en Materiales Avanzados S. C., Subsede Monterrey, Grupo de Investigación DORA-Lab, 66628, Apodaca, N. L, México
- Centro de Investigación e Innovación Tecnológica (CIIT), Grupo de Investigación DORA-Lab, Tecnológico Nacional de México Campus Nuevo León (TECNL), 66629, Apodaca, N. L, México
- Investigadores Por México, CONAHCYT, Ciudad de México, México
| | - Alberto Hernández-Eligio
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001. Col. Chamilpa, 62210, Cuernavaca, Morelos, México
- Investigadores Por México, CONAHCYT, Ciudad de México, México
| | - Margarita Miranda-Hernández
- Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Priv. Xochicalco, 62580, Temixco, Morelos, México
| | - Katy Juárez
- Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001. Col. Chamilpa, 62210, Cuernavaca, Morelos, México.
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2
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Park J, Huang S, Koel BE, Jaffé PR. Enhanced Feammox activity and perfluorooctanoic acid (PFOA) degradation by Acidimicrobium sp. Strain A6 using PAA-coated ferrihydrite as an electron acceptor. JOURNAL OF HAZARDOUS MATERIALS 2023; 459:132039. [PMID: 37480613 PMCID: PMC10529297 DOI: 10.1016/j.jhazmat.2023.132039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 06/08/2023] [Accepted: 07/09/2023] [Indexed: 07/24/2023]
Abstract
Acidimicrobium sp. Strain A6 (A6) can degrade perfluoroalkyl acids (PFAAs) by oxidizing NH4+ while reducing Fe(Ⅲ). However, supplying and distributing Fe(III) phases in sediments is challenging since surface charges of Fe(III)-phases are typically positive while those of sediments are negative. Therefore, ferrihydrite particles were coated with polyacrylic acid (PAA) with four different molecular weights, resulting in a negative zeta potential on their surface. Zeta potential was determined as a function of pH and PAA loading, with the lowest value observed when the PAA/ferrihydrite ratio was > 1/5 (w/w) at a pH of 5.5. Several 50-day incubations with an A6-enrichment culture were conducted to determine the effect of PAA-coated ferrihydrite as the electron acceptor of A6 on the Feammox activity and PFOA degradation. NH4+ oxidation, PFOA degradation, production of shorter-chain PFAS, and F- were observed in all PAA-coated samples. The 6 K and 450 K treatments exhibited significant reductions in PFOA concentration and substantial F- production compared to incubations with bare ferrihydrite. Electrochemical impedance spectroscopy showed lowered charge transfer resistance in the presence of PAA-coated ferrihydrite, indicating that PAAs facilitated electron transfer to ferrihydrite. This study highlights the potential of PAA-coated ferrihydrite in accelerating PFAS defluorination, providing novel insights for A6-based bioremediation strategies.
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Affiliation(s)
- Jinhee Park
- Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544, USA
| | - Shan Huang
- Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544, USA
| | - Bruce E Koel
- Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ 08544, USA
| | - Peter R Jaffé
- Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544, USA.
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Khalil AM, Abdelaal S, Abdelhady AM, Abou-Salem LI, Shash NM, Elmaghraby EK. Radiation-induced lattice relaxation in [Formula: see text]-Fe[Formula: see text]O[Formula: see text] nanorods. Sci Rep 2023; 13:16194. [PMID: 37758762 PMCID: PMC10533876 DOI: 10.1038/s41598-023-43332-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Accepted: 09/22/2023] [Indexed: 09/29/2023] Open
Abstract
We report radiation-induced lattice relaxation of the [Formula: see text]-Fe[Formula: see text]O[Formula: see text] and its associated alteration of particle morphology. The [Formula: see text]-Fe[Formula: see text]O[Formula: see text] was grown in solution by microwave hydrothermal synthesis technique in which more than half of the synthesized material was nanorods with axis along the (001) direction. Five sets of the synthesized [Formula: see text]-Fe[Formula: see text]O[Formula: see text] samples were irradiated using gamma-ray from [Formula: see text]Co cell with doses of 600 kGy, 700 kGy, 800 kGy, 900 kGy, and 1 MGy. The investigation of the pristine and gamma-irradiated samples was carried out using X-ray powder diffraction, transmission electron microscope, and electron paramagnetic resonance methods. Results showed that continuous alternation of radiation-induced lattice compression and expansion causes lattice relaxation. The morphology of the [Formula: see text]-Fe[Formula: see text]O[Formula: see text] nanorods was found to change with absorbed dose into buckyball-shaped particles in response to the alternation of the compression and expansion strain. The EPR results showed a correlation between distortion in the [Formula: see text]-[Formula: see text] octahedron structure and the relaxation of the lattice. The synthesis, growth, and relaxation are discussed in detail.
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Affiliation(s)
- Ahmad M. Khalil
- Physics Department, Faculty of Science, Benha University, Banha, Egypt
- Basic Science Department, Faculty of Engineering, Sinai University, Arish, Egypt
| | - Saad Abdelaal
- Accelerator and Ion Sources Department, Nuclear Research Center, Egyptian Atomic Energy Authority, Cairo, 13759 Egypt
- Central Lab for Elemental and Isotopic Analysis, Nuclear Research Center, Egyptian Atomic Energy Authority, Cairo, 13759 Egypt
| | - A. M. Abdelhady
- Accelerator and Ion Sources Department, Nuclear Research Center, Egyptian Atomic Energy Authority, Cairo, 13759 Egypt
- Central Lab for Elemental and Isotopic Analysis, Nuclear Research Center, Egyptian Atomic Energy Authority, Cairo, 13759 Egypt
| | - L. I. Abou-Salem
- Physics Department, Faculty of Science, Benha University, Banha, Egypt
| | - N. M. Shash
- Physics Department, Faculty of Science, Benha University, Banha, Egypt
| | - Elsayed K. Elmaghraby
- Experimental Nuclear Physics Department, Nuclear Research Center, Egyptian Atomic Energy Authority, Cairo, 13759 Egypt
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4
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Obradović MD, Gojković SL. Challenges in determining the electrochemically active surface area of Ni-oxides in the oxygen evolution reaction. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116479] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Banbela HM, Alharbi LM, Al-Dahiri RH, Jaremko M, Abdel Salam M. Preparation, Characterization, and Electrochemical Performance of the Hematite/Oxidized Multi-Walled Carbon Nanotubes Nanocomposite. Molecules 2022; 27:molecules27092708. [PMID: 35566063 PMCID: PMC9102378 DOI: 10.3390/molecules27092708] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 04/10/2022] [Accepted: 04/19/2022] [Indexed: 11/16/2022] Open
Abstract
In this research work, a hematite (α-Fe2O3) nanoparticle was prepared and then mixed with oxidized multi-walled carbon nanotubes (O-MWCNT) to form a stable suspension of an α-Fe2O3/O-MWCNTs nanocomposite. Different characterization techniques were used to explore the chemical and physical properties of the α-Fe2O3/O-MWCNTs nanocomposite, including XRD, FT-IR, UV-Vis, and SEM. The results revealed the successful formation of the α-Fe2O3 nanoparticles, and the oxidation of the MWCNT, as well as the formation of stable α-Fe2O3/O-MWCNTs nanocomposite. The electrochemical behaviour of the α-Fe2O3/O-MWCNTs nanocomposite was investigated using cyclic voltammetry (CV) and linear sweep voltammetry (LSV), and the results revealed that modification of α-Fe2O3 nanoparticles with O-MWCNTs greatly enhanced electrochemical performance and capacitive behaviour, as well as cycling stability.
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Affiliation(s)
- Hadeel M. Banbela
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80200, Jeddah 21589, Saudi Arabia; (H.M.B.); (L.M.A.)
- Department of Chemistry, College of Science and Arts at Khulis, University of Jeddah, P.O. Box 355, Jeddah 21959, Saudi Arabia
| | - Laila M. Alharbi
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80200, Jeddah 21589, Saudi Arabia; (H.M.B.); (L.M.A.)
| | - Reema H. Al-Dahiri
- Department of Chemistry, College of Science, University of Jeddah, P.O. Box 34, Jeddah 21959, Saudi Arabia;
| | - Mariusz Jaremko
- Smart-Health Initiative (SHI), Red Sea Research Center (RSRC), Biological and Environmental Science and Engineering (BESE) Division, King Abdullah University of Science and Technology (KAUST), P.O. Box 4700, Thuwal 23955-6900, Saudi Arabia;
| | - Mohamed Abdel Salam
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80200, Jeddah 21589, Saudi Arabia; (H.M.B.); (L.M.A.)
- Correspondence: ; Tel.: +966-541886660; Fax: +966-2-6952292
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6
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Delcompare-Rodriguez PA, Seriani N. Ultrathin space charge layer in hematite photoelectrodes: A theoretical investigation. J Chem Phys 2021; 155:114701. [PMID: 34551523 DOI: 10.1063/5.0060417] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The space charge layer in hematite photoelectrodes has been analyzed by means of Poisson-Boltzmann equations, the Stern model, and density functional theory, in view of its application for photoelectrochemical water oxidation. The width of the space charge layer can be smaller than ∼10 Å under experimental conditions. In this regime, a substantial part of the potential drop takes place in the Helmholtz layer, leading to important corrections to the Mott-Schottky behavior of the space charge layer capacitance. These results shed light on an unexpected regime of high photoelectrocatalytic efficiency, different from the classical picture of the electrochemical interface of a semiconducting photocatalyst, which is also amenable to direct study by quantum-mechanical atomistic simulations. Density functional theory has been used to calculate the band bending (BB) in the space charge layer in atomistic models of pristine stoichiometric and hydroxylated surfaces. These surface terminations display BBs of 0.14 and 0.49 eV, respectively, with an increasing width of the space charge layer, however still in the sub-nanometer regime. This work shows that, at high doping, the width of the space charge layer of a hematite photoelectrode can become comparable with interatomic distances.
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Affiliation(s)
| | - N Seriani
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
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7
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Brewster DA, Koch MD, Knowles KE. Evaluation of electrochemical properties of nanostructured metal oxide electrodes immersed in redox-inactive organic media. Phys Chem Chem Phys 2021; 23:17904-17916. [PMID: 34378559 DOI: 10.1039/d1cp02370e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This paper describes analysis of dropcast nanocrystalline and electrochemically deposited films of NiO and α-Fe2O3 as model metal oxide semiconductors immersed in redox-inactive organic electrolyte solutions using electrochemical impedance spectroscopy (EIS). Although the data reported here fit a circuit commonly used to model EIS data of metal oxide electrodes, which comprises an RC circuit nested inside a second RC circuit that is in series with a resistor, our interpretation of the physical meaning of these circuit elements differs from that applied to EIS measurements of metal oxide electrodes immersed in redox-active media. The data presented here are most consistent with an interpretation in which the nested RC circuit represents charge transfer between the metal oxide film and the underlying metal electrode, and the non-nested RC circuit represents the resistance and capacitance associated with formation of a charge-compensating double-layer at the exposed interface between the metal electrode and electrolyte solution. Applying this interpretation to analysis of EIS data collected for metal oxide films in organic media enables the impact of film morphology on electrochemical behavior to be distinguished from the effects of the intrinsic electronic structure of the metal oxide. This distinction is crucial to the evaluation of nanostructured metal oxide electrodes for electrochemical energy storage and electrocatalysis applications.
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Affiliation(s)
- David A Brewster
- Department of Chemistry, University of Rochester, Rochester, NY 14627, USA.
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Huang J, Jones A, Waite TD, Chen Y, Huang X, Rosso KM, Kappler A, Mansor M, Tratnyek PG, Zhang H. Fe(II) Redox Chemistry in the Environment. Chem Rev 2021; 121:8161-8233. [PMID: 34143612 DOI: 10.1021/acs.chemrev.0c01286] [Citation(s) in RCA: 166] [Impact Index Per Article: 55.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Iron (Fe) is the fourth most abundant element in the earth's crust and plays important roles in both biological and chemical processes. The redox reactivity of various Fe(II) forms has gained increasing attention over recent decades in the areas of (bio) geochemistry, environmental chemistry and engineering, and material sciences. The goal of this paper is to review these recent advances and the current state of knowledge of Fe(II) redox chemistry in the environment. Specifically, this comprehensive review focuses on the redox reactivity of four types of Fe(II) species including aqueous Fe(II), Fe(II) complexed with ligands, minerals bearing structural Fe(II), and sorbed Fe(II) on mineral oxide surfaces. The formation pathways, factors governing the reactivity, insights into potential mechanisms, reactivity comparison, and characterization techniques are discussed with reference to the most recent breakthroughs in this field where possible. We also cover the roles of these Fe(II) species in environmental applications of zerovalent iron, microbial processes, biogeochemical cycling of carbon and nutrients, and their abiotic oxidation related processes in natural and engineered systems.
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Affiliation(s)
- Jianzhi Huang
- Department of Civil and Environmental Engineering, Case Western Reserve University, 2104 Adelbert Road, Cleveland, Ohio 44106, United States
| | - Adele Jones
- UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - T David Waite
- UNSW Water Research Centre, School of Civil and Environmental Engineering, University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Yiling Chen
- Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China
| | - Xiaopeng Huang
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Kevin M Rosso
- Physical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Andreas Kappler
- Geomicrobiology, Center for Applied Geosciences, University of Tuebingen, 72076 Tuebingen, Germany
| | - Muammar Mansor
- Geomicrobiology, Center for Applied Geosciences, University of Tuebingen, 72076 Tuebingen, Germany
| | - Paul G Tratnyek
- School of Public Health, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, Oregon 97239, United States
| | - Huichun Zhang
- Department of Civil and Environmental Engineering, Case Western Reserve University, 2104 Adelbert Road, Cleveland, Ohio 44106, United States
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Haziri V, Nha TPT, Berisha A, Boily JF. A gateway for ion transport on gas bubbles pinned onto solids. Commun Chem 2021; 4:43. [PMID: 36697541 PMCID: PMC9814891 DOI: 10.1038/s42004-021-00481-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 02/26/2021] [Indexed: 01/28/2023] Open
Abstract
Gas bubbles grown on solids are more than simple vehicles for gas transport. They are charged particles with surfaces populated with exchangeable ions. We here unveil a gateway for alkali metal ion transport between oxygen bubbles and semi-conducting (iron oxide) and conducting (gold) surfaces. This gateway was identified by electrochemical impedance spectroscopy using an ultramicroelectrode in direct contact with bubbles pinned onto these solid surfaces. We show that this gateway is naturally present at open circuit potentials, and that negative electric potentials applied through the solid enhance ion transport. In contrast, positive potentials or contact with an insulator (polytetrafluoroethylene) attenuates transport. We propose that this gateway is generated by overlapping electric double layers of bubbles and surfaces of contrasting (electro)chemical potentials. Knowledge of this ion transfer phenomenon is essential for understanding electric shielding and reaction overpotential caused by bubbles on catalysts. This has especially important ramifications for predicting processes including mineral flotation, microfluidics, pore water geochemistry, and fuel cell technology.
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Affiliation(s)
- Veton Haziri
- Department of Chemistry, University of Prishtina, Prishtina, Kosovo
| | | | - Avni Berisha
- Department of Chemistry, University of Prishtina, Prishtina, Kosovo.
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Obradović MD, Balanč BD, Lačnjevac UČ, Gojković SL. Electrochemically deposited iridium-oxide: Estimation of intrinsic activity and stability in oxygen evolution in acid solution. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2020.114944] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Alsultan M, Choi J, Jalili R, Wagner P, Swiegers GF. Synergistic amplification of (photo)catalytic oxygen and hydrogen generation from water by thin-film polypyrrole composites. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.110955] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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Lahbib H, Ben Hassen S, Gerengi H, Ben Amor Y. Inhibition effect of Cynara cardunculus leaf extract on corrosion of St37 steel immersed in seawater with and without bleach solution. CHEM ENG COMMUN 2020. [DOI: 10.1080/00986445.2020.1771320] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Hana Lahbib
- Research Laboratory of Environmental Sciences & Technologies, Higher Institute of Environmental Sciences and Technology, Carthage University, Ben Arous, Tunisia
| | - Samia Ben Hassen
- Research Laboratory of Environmental Sciences & Technologies, Higher Institute of Environmental Sciences and Technology, Carthage University, Ben Arous, Tunisia
| | - Hüsnü Gerengi
- Corrosion Research Laboratory, Faculty of Engineering, Department of Mechanical Engineering, Duzce University, Duzce, Turkey
| | - Yasser Ben Amor
- Research Laboratory of Environmental Sciences & Technologies, Higher Institute of Environmental Sciences and Technology, Carthage University, Ben Arous, Tunisia
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13
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Enhancement of corrosion resistance of the cooling systems in desalination plants by green inhibitor. Sci Rep 2020; 10:4812. [PMID: 32179877 PMCID: PMC7075887 DOI: 10.1038/s41598-020-61810-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 03/02/2020] [Indexed: 12/12/2022] Open
Abstract
Taraxacum officinale extract (TOE) has been tested for preventing the corrosion of cooling systems in desalination plants. The inhibition of corrosion effects has been characterized by chemical and electrochemical methods (Mass loss, potentiodynamic polarization and electrochemical impedance spectroscopy) and surface observations. Tests on cooling systems were carried out in seawater environment. The presence of TOE in the re-circulation loop decreases the corrosion of carbon steel by adsorption of TOE compounds on the surface of metal pipes. The optimum TOE concentration was reached at 400 mg L-1 and the inhibition efficiency was higher than 94%. TOE allowed increasing the energy barrier of the corrosion process. SEM, FT-IR and UV spectra observations confirmed that TOE prevents corrosion attacks at the surface of the pipes. HPLC analyses identified the presence of saccharides, organic acids, phenol antioxidant and caffeic acid derivatives in TOE, which may be the active promoters of corrosion inhibition.
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Monllor-Satoca D, Díez-García MI, Lana-Villarreal T, Gómez R. Photoelectrocatalytic production of solar fuels with semiconductor oxides: materials, activity and modeling. Chem Commun (Camb) 2020; 56:12272-12289. [DOI: 10.1039/d0cc04387g] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Transition metal oxides keep on being excellent candidates as electrode materials for the photoelectrochemical conversion of solar energy into chemical energy.
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Affiliation(s)
- Damián Monllor-Satoca
- Departament de Química Física i Institut Universitari d'Electroquímica
- Universitat d'Alacant
- Alicante
- Spain
| | - María Isabel Díez-García
- Departament de Química Física i Institut Universitari d'Electroquímica
- Universitat d'Alacant
- Alicante
- Spain
| | - Teresa Lana-Villarreal
- Departament de Química Física i Institut Universitari d'Electroquímica
- Universitat d'Alacant
- Alicante
- Spain
| | - Roberto Gómez
- Departament de Química Física i Institut Universitari d'Electroquímica
- Universitat d'Alacant
- Alicante
- Spain
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15
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Singh C, Liberman I, Shimoni R, Ifraemov R, Hod I. Pristine versus Pyrolyzed Metal-Organic Framework-based Oxygen Evolution Electrocatalysts: Evaluation of Intrinsic Activity Using Electrochemical Impedance Spectroscopy. J Phys Chem Lett 2019; 10:3630-3636. [PMID: 31194556 DOI: 10.1021/acs.jpclett.9b01232] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Metal-organic frameworks (MOFs) have emerged as outstanding electrocatalysts for water oxidation. Commonly, MOFs are utilized for electrocatalytic water oxidation either in pristine or pyrolyzed form. Yet, despite significant advancements in their catalytic performance, further improvement requires new insights on the parameters influencing MOF-based catalysts activity. Here, we have conducted a detailed comparison between the intrinsic electrocatalytic properties of pristine and pyrolyzed Ni-Fe-based MOFs. Interestingly, although pristine MOF exhibits the maximum overall electrocatalytic performance, apparent turnover frequency (TOF) values (intrinsic activity) of all pyrolyzed MOFs exceeded the one of pristine MOF. Moreover, an upper-limit estimation of TOF was extracted using electrochemical impedance spectroscopy (EIS), by excluding IR-drops linked with the electrochemical cell. By doing so, EIS-extracted TOF values were 10-times higher compared to the apparent TOFs. Accordingly, a great leap in performance should still be expected for these catalysts, by designing conductive MOF-platforms having larger pore-diameters to reduce mass-transport limitations.
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Affiliation(s)
- Chanderpratap Singh
- Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology , Ben-Gurion University of Negev , Beer-Sheva 8410501 , Israel
| | - Itamar Liberman
- Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology , Ben-Gurion University of Negev , Beer-Sheva 8410501 , Israel
| | - Ran Shimoni
- Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology , Ben-Gurion University of Negev , Beer-Sheva 8410501 , Israel
| | - Raya Ifraemov
- Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology , Ben-Gurion University of Negev , Beer-Sheva 8410501 , Israel
| | - Idan Hod
- Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology , Ben-Gurion University of Negev , Beer-Sheva 8410501 , Israel
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16
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Wang H, Johs A, Browning JF, Tennant DA, Liang L. Electrochemical properties of the interaction between cytochrome c and a hematite nanowire array electrode. Bioelectrochemistry 2019; 129:162-169. [PMID: 31176253 DOI: 10.1016/j.bioelechem.2019.05.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 05/22/2019] [Accepted: 05/22/2019] [Indexed: 11/30/2022]
Abstract
We investigate the interaction of horse heart cytochrome c (cyt c) with hematite nanowire array electrodes by cyclic voltammetry to study the electron transfer between redox active proteins and mineral surfaces. Using this model system, we quantify electron transfer rates between cyt c and hematite under varying electric potential and pH conditions. The results are consistent with two cyt c conformations adsorbed at the hematite surface: the native and a partially unfolded form. The partially unfolded protein maintained redox activity, but at a lower redox potential than the native protein. Adsorption of cyt c allowed direct electron transfer between cyt c and hematite, with an interfacial electron transfer rate, k°ET, of 0.4 s-1 for the native form and 0.55 s-1 for the partially unfolded protein at pH 7.07. At pH 4.66, protein adsorption decreased compared to neutral pH and the fraction of partially unfolded protein increased. Additionally, the diffusion controlled electron transfer rate between hematite and the electron shuttling compound anthraquinone-2,6-disulfonate (AQDS) was determined to be k°ET = 8.0·10-3 cm·s-1 at pH 7.07. Modulation of electron transfer rates as a result of conformational changes by redox active proteins has broad implications for describing chemical transformations at biological-mineral interfaces.
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Affiliation(s)
- Hanyu Wang
- Neutron Scattering Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA
| | - Alexander Johs
- Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA
| | - James F Browning
- Neutron Scattering Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA
| | - David Alan Tennant
- Materials Science and Technology Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA
| | - Liyuan Liang
- Environmental Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA.
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17
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Surface potential study of ceria/poly(sodium 4-styrenesulfonate) aqueous solution interface. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.03.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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18
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Ulman K, Poli E, Seriani N, Piccinin S, Gebauer R. Understanding the electrochemical double layer at the hematite/water interface: A first principles molecular dynamics study. J Chem Phys 2019; 150:041707. [PMID: 30709242 DOI: 10.1063/1.5047930] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Affiliation(s)
- Kanchan Ulman
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
| | - Emiliano Poli
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
| | - Nicola Seriani
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
| | - Simone Piccinin
- CNR-IOM Democritos, c/o SISSA, Via Bonomea 265, 34136 Trieste, Italy
| | - Ralph Gebauer
- The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, 34151 Trieste, Italy
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19
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Lucas M, Yeşilbaş M, Shchukarev A, Boily JF. X-ray Photoelectron Spectroscopy of Fast-Frozen Hematite Colloids in Aqueous Solutions. 6. Sodium Halide (F -, Cl -, Br -, I -) Ion Binding on Microparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:13497-13504. [PMID: 30336048 DOI: 10.1021/acs.langmuir.8b01507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Electrolyte ion binding at mineral surfaces is central to the generation of surface charge and key to electric double-layer formation. X-ray photoelectron spectroscopy of fast-frozen (-170 °C) mineral wet pastes provides a means to study weakly bound electrolyte ions at the mineral/water interface. In this study, we build upon a series of articles devoted to ion binding at hematite (α-Fe2O3) particle surfaces to resolve the nature of sodium halide ion binding. Measurements on micron-sized hematite particles terminated by the charged and amphoteric (012) and the relatively uncharged (001) faces point to the formation of salt loadings of similar composition to those of cryosalts of NaCl, NaBr, NaI, and NaF. These coatings could be likened to those of the better-known hydrohalite (NaCl·2H2O) phase, one that typically forms under concentrated (≫0.1 M) aqueous solutions of NaCl under freezing conditions. As we have previously shown that these reaction products do not occur in nanosized hematite particles, our work points to the involvement of the basal (001) face and/or the juxtaposition of these faces in packed tabular microparticles of hematite (1-3 μm in width) in stabilizing these cryosalts. One possible formation pathway involves first-layer Na+ and Cl- ions serving as an anchoring layer for a topotactic-like growth of amorphous to low-crystalline salt hydrates at the (001) face. Thus, by contrasting reaction products of four sodium halides at surfaces of tabular microparticles of hematite, this work revealed the formation of cryosalt-like solids. The formation of such solids may have especially important ramifications to ice nucleation mechanisms in the atmosphere, as well as in saline permafrosts on Earth and on planet Mars where salt-laden mineral particles prevail.
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Affiliation(s)
- Marie Lucas
- Department of Chemistry , Umeå University , SE-901 87 Umeå , Sweden
| | - Merve Yeşilbaş
- Department of Chemistry , Umeå University , SE-901 87 Umeå , Sweden
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20
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Klotz D, Grave DA, Dotan H, Rothschild A. Empirical Analysis of the Photoelectrochemical Impedance Response of Hematite Photoanodes for Water Photo-oxidation. J Phys Chem Lett 2018; 9:1466-1472. [PMID: 29512388 DOI: 10.1021/acs.jpclett.8b00096] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Photoelectrochemical impedance spectroscopy (PEIS) is a useful tool for the characterization of photoelectrodes for solar water splitting. However, the analysis of PEIS spectra often involves a priori assumptions that might bias the results. This work puts forward an empirical method that analyzes the distribution of relaxation times (DRT), obtained directly from the measured PEIS spectra of a model hematite photoanode. By following how the DRT evolves as a function of control parameters such as the applied potential and composition of the electrolyte solution, we obtain unbiased insights into the underlying mechanisms that shape the photocurrent. In a subsequent step, we fit the data to a process-oriented equivalent circuit model (ECM) whose makeup is derived from the DRT analysis in the first step. This yields consistent quantitative trends of the dominant polarization processes observed. Our observations reveal a common step for the photo-oxidation reactions of water and H2O2 in alkaline solution.
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Affiliation(s)
- Dino Klotz
- Department of Materials Science and Engineering , Technion - Israel Institute of Technology , Haifa 32000 , Israel
- International Institute for Carbon-Neutral Energy Research , Kyushu University , 744 Motooka , Nishi-ku Fukuoka 819-0395 , Japan
| | - Daniel A Grave
- Department of Materials Science and Engineering , Technion - Israel Institute of Technology , Haifa 32000 , Israel
| | - Hen Dotan
- Department of Materials Science and Engineering , Technion - Israel Institute of Technology , Haifa 32000 , Israel
| | - Avner Rothschild
- Department of Materials Science and Engineering , Technion - Israel Institute of Technology , Haifa 32000 , Israel
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21
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Shabani-Nooshabadi M, Kazemi-Darafshani M. Root and shoot extracts of Ajuga chamaecistus subsp. scoparia as natural inhibitors for 304 stainless steel corrosion in strong acidic medium. SURFACE ENGINEERING AND APPLIED ELECTROCHEMISTRY 2017. [DOI: 10.3103/s1068375517060114] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Klotz D, Ellis DS, Dotan H, Rothschild A. Empirical in operando analysis of the charge carrier dynamics in hematite photoanodes by PEIS, IMPS and IMVS. Phys Chem Chem Phys 2016; 18:23438-57. [PMID: 27524381 PMCID: PMC5310524 DOI: 10.1039/c6cp04683e] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 08/01/2016] [Indexed: 12/23/2022]
Abstract
In this Perspective, we introduce intensity modulated photocurrent/voltage spectroscopy (IMPS and IMVS) as powerful tools for the analysis of charge carrier dynamics in photoelectrochemical (PEC) cells for solar water splitting, taking hematite (α-Fe2O3) photoanodes as a case study. We complete the picture by including photoelectrochemical impedance spectroscopy (PEIS) and linking the trio of PEIS, IMPS and IMVS, introduced here as photoelectrochemical immittance triplets (PIT), both mathematically and phenomenologically, demonstrating what conclusions can be extracted from these measurements. A novel way of analyzing the results by an empirical approach with minimal presumptions is introduced, using the distribution of relaxation times (DRT) function. The DRT approach is compared to conventional analysis approaches that are based on physical models and therefore come with model presumptions. This work uses a thin film hematite photoanode as a model system, but the approach can be applied to other PEC systems as well.
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Affiliation(s)
- Dino Klotz
- Department of Materials Science and Engineering , Technion – Israel Institute of Technology , 3200003 Haifa , Israel . ;
- Institute for Applied Materials – Materials for Electrical and Electronic Engineering (IAM-WET) , Karlsruhe Institute of Technology (KIT) , 76131 Karlsruhe , Germany
| | - David Shai Ellis
- Department of Materials Science and Engineering , Technion – Israel Institute of Technology , 3200003 Haifa , Israel . ;
| | - Hen Dotan
- Department of Materials Science and Engineering , Technion – Israel Institute of Technology , 3200003 Haifa , Israel . ;
| | - Avner Rothschild
- Department of Materials Science and Engineering , Technion – Israel Institute of Technology , 3200003 Haifa , Israel . ;
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23
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Díez-García MI, Gómez R. Investigating Water Splitting with CaFe2O4 Photocathodes by Electrochemical Impedance Spectroscopy. ACS APPLIED MATERIALS & INTERFACES 2016; 8:21387-21397. [PMID: 27466695 DOI: 10.1021/acsami.6b07465] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Artificial photosynthesis constitutes one of the most promising alternatives for harvesting solar energy in the form of fuels, such as hydrogen. Among the different devices that could be developed to achieve efficient water photosplitting, tandem photoelectrochemical cells show more flexibility and offer high theoretical conversion efficiency. The development of these cells depends on finding efficient and stable photoanodes and, particularly, photocathodes, which requires having reliable information on the mechanism of charge transfer at the semiconductor/solution interface. In this context, this work deals with the preparation of thin film calcium ferrite electrodes and their photoelectrochemical characterization for hydrogen generation by means of electrochemical impedance spectroscopy (EIS). A fully theoretical model that includes elementary steps for electron transfer to the electrolyte and surface recombination with photogenerated holes is presented. The model also takes into account the complexity of the semiconductor/solution interface by including the capacitances of the space charge region, the surface states and the Helmholtz layer (as a constant phase element). After illustrating the predicted Nyquist plots in a general manner, the experimental results for calcium ferrite electrodes at different applied potentials and under different illumination intensities are fitted to the model. The excellent agreement between the model and the experimental results is illustrated by the simultaneous fit of both Nyquist and Bode plots. The concordance between both theory and experiments allows us to conclude that a direct transfer of electrons from the conduction band to water prevails for hydrogen photogeneration on calcium ferrite electrodes and that most of the carrier recombination occurs in the material bulk. In more general vein, this study illustrates how the use of EIS may provide important clues about the behavior of photoelectrodes and the main strategies for their improvement.
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Affiliation(s)
- María Isabel Díez-García
- Departament de Química Física i Institut Universitari d'Electroquímica, Universitat d'Alacant , Apartat 99, E-03080 Alacant, Spain
| | - Roberto Gómez
- Departament de Química Física i Institut Universitari d'Electroquímica, Universitat d'Alacant , Apartat 99, E-03080 Alacant, Spain
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24
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Mechanism of the cathodic process coupled to the oxidation of iron monosulfide by dissolved oxygen. J Colloid Interface Sci 2016; 467:51-59. [DOI: 10.1016/j.jcis.2016.01.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 01/05/2016] [Accepted: 01/05/2016] [Indexed: 11/18/2022]
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25
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Lucas M, Boily JF. Mapping Electrochemical Heterogeneity at Iron Oxide Surfaces: A Local Electrochemical Impedance Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:13618-13624. [PMID: 26625255 DOI: 10.1021/acs.langmuir.5b03849] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Alternating current scanning electrochemical microscopy (AC-SECM) was used for the first time to map key electrochemical attributes of oriented hematite (α-Fe2O3) single crystal surfaces at the micron-scale. Localized electrochemical impedance spectra (LEIS) of the (001) and (012) faces provided insight into the spatial variations of local double layer capacitance (C(dl)) and charge transfer resistance (R(ad)). These parameters were extracted by LEIS measurements in the 0.4-8000 Hz range to probe the impedance response generated by the redistribution of water molecules and charge carriers (ions) under an applied AC. These were attributed to local variations in the local conductivity of the sample surfaces. Comparison with global EIS measurements on the same samples uncovered highly comparable frequency-resolved processes, that were broken down into contributions from the bulk hematite, the interface as well as the microelectrode/tip assembly. This work paves the way for new studies aimed at mapping electrochemical processes at the mesoscale on this environmentally and technologically important material.
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Affiliation(s)
- Marie Lucas
- Department of Chemistry, Umeå University , Umeå SE-901 87, Sweden
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26
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Santolina chamaecyparissus extract as a natural source inhibitor for 304 stainless steel corrosion in 3.5% NaCl. J IND ENG CHEM 2015. [DOI: 10.1016/j.jiec.2015.06.028] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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27
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Malara F, Minguzzi A, Marelli M, Morandi S, Psaro R, Dal Santo V, Naldoni A. α-Fe2O3/NiOOH: An Effective Heterostructure for Photoelectrochemical Water Oxidation. ACS Catal 2015. [DOI: 10.1021/acscatal.5b01045] [Citation(s) in RCA: 198] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Francesco Malara
- CNR-Istituto di Scienze e Tecnologie Molecolari, Via Golgi 19, 20133 Milan, Italy
| | - Alessandro Minguzzi
- Dipartimento
di Chimica, Universitá degli Studi di Milano, Via Golgi
19, 20133 Milan, Italy
| | - Marcello Marelli
- CNR-Istituto di Scienze e Tecnologie Molecolari, Via Golgi 19, 20133 Milan, Italy
| | - Sara Morandi
- Dipartimento
di Chimica, Universitá degli Studi di Milano, Via Golgi
19, 20133 Milan, Italy
| | - Rinaldo Psaro
- CNR-Istituto di Scienze e Tecnologie Molecolari, Via Golgi 19, 20133 Milan, Italy
| | - Vladimiro Dal Santo
- CNR-Istituto di Scienze e Tecnologie Molecolari, Via Golgi 19, 20133 Milan, Italy
| | - Alberto Naldoni
- CNR-Istituto di Scienze e Tecnologie Molecolari, Via Golgi 19, 20133 Milan, Italy
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28
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Shimizu K, Nyström J, Geladi P, Lindholm-Sethson B, Boily JF. Electrolyte ion adsorption and charge blocking effect at the hematite/aqueous solution interface: an electrochemical impedance study using multivariate data analysis. Phys Chem Chem Phys 2015; 17:11560-8. [PMID: 25857599 DOI: 10.1039/c4cp05927a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A model-free multivariate analysis using singular value decomposition is employed to refine an equivalent electrical circuit model in order to probe the electrochemical properties of the hematite/water interface in dilute NaCl and NH4Cl solutions using electrochemical impedance spectroscopy. The result shows that the surface protonation is directly related to the mobility and trapping of charge carriers at the mineral surface. Moreover, the point of zero charge can be found at pH where the charge transfer resistance is the highest, in addition to the minimum double layer capacitance. The inner-sphere interaction of the NH4(+) ion with the surface is indicated by an increase of capacitance for charge carrier trapping from the protonated surface as well as lower double layer capacitance and open circuit potential. It is clear that the intrinsic electrochemical activity of hematite depends on the degree of surface (de)protonation and other inner-sphere adsorption, as these processes affect the charge carrier density in the surface state. This work also highlights an important synergistic effect of the two spectral analyses that enables EIS to be utilized in an in-depth investigation of mineral/water interfaces.
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Affiliation(s)
- K Shimizu
- Department of Chemistry, Umeå University, 90187, Umeå, Sweden.
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29
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Chee PM, Boix PP, Ge H, Yanan F, Barber J, Wong LH. Core-shell hematite nanorods: a simple method to improve the charge transfer in the photoanode for photoelectrochemical water splitting. ACS APPLIED MATERIALS & INTERFACES 2015; 7:6852-9. [PMID: 25790720 DOI: 10.1021/acsami.5b00417] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
We report a simple method to produce a stable and repeatable photoanode for water splitting with a core-shell hematite (α-Fe2O3) nanorods system by combining spray pyrolysis and hydrothermal synthesis. Impedance spectroscopy revealed passivation of the surface states by the shell layer, which results in an increase of the charge injection through the hematite conduction band. In pristine hematite more holes are accumulated on the surface and the charge transfer to the electrolyte occurs through surface states, whereas in the core-shell hematite photoanode the majority of hole transfer process occurs through the valence band. As a result the photoactivity of the core-shell nanorods, 1.2 mA cm(-2), at 1.23 V vs RHE, is twice that of pristine hematite nanorods. The alteration of the interface energetics is supported by TEM, showing that the crystallinity of the surface has been improved by the deposition of the shell.
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Affiliation(s)
- Png Mei Chee
- †Solar Fuels Lab, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
| | - Pablo P Boix
- ‡Energy Research Institute@NTU (ERI@N), Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, Singapore 637553
| | - Hu Ge
- †Solar Fuels Lab, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
| | - Fang Yanan
- †Solar Fuels Lab, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
| | - James Barber
- †Solar Fuels Lab, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
- §Applied Science and Technology Department-BioSolar Lab, Politecnico di Torino, Viale T. Michel 5, 15121 Alessandria, Italy
- ∥Department of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
| | - Lydia Helena Wong
- †Solar Fuels Lab, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798
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30
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Xu B, Ji Y, Zhang X, Jin X, Yang W, Chen Y. Experimental and theoretical studies on the corrosion inhibition performance of 4-amino-N,N-di-(2-pyridylmethyl)-aniline on mild steel in hydrochloric acid. RSC Adv 2015. [DOI: 10.1039/c5ra09173j] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Evaluate the inhibition properties of a pyridine derivative with more than one pyridine ring, 4-amino-N,N-di-(2-pyridylmethyl)-aniline, on mild steel in HCl.
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Affiliation(s)
- Bin Xu
- Department of Applied Chemistry
- School of Science
- Nanjing Tech University
- Nanjing 210009
- China
| | - Yan Ji
- Department of Applied Chemistry
- School of Science
- Nanjing Tech University
- Nanjing 210009
- China
| | - Xueqiong Zhang
- Department of Applied Chemistry
- School of Science
- Nanjing Tech University
- Nanjing 210009
- China
| | - Xiaodong Jin
- Department of Applied Chemistry
- School of Science
- Nanjing Tech University
- Nanjing 210009
- China
| | - Wenzhong Yang
- Department of Applied Chemistry
- School of Science
- Nanjing Tech University
- Nanjing 210009
- China
| | - Yizhong Chen
- School of Environmental and Safety Engineering
- Jiangsu Polytechnic University
- Changzhou 213164
- China
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31
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Shimizu K, Boily JF. Electrochemical properties and relaxation times of the hematite/water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:9591-9598. [PMID: 25072470 DOI: 10.1021/la501669a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Electric double layer properties and protonation rates at the surface of a mechanically and chemically polished (001) surface of hematite (α-Fe2O3) contacted with aqueous solutions of NaCl were extracted by electrochemical impedance spectroscopy (EIS). Effects of pH (4-12) and ionic strength (10-1000 mM) on the EIS response of the electrode were predicted using an electrical equivalent circuit model accounting for hematite bulk and interfacial processes. These efforts generated diffuse layer as well as compact layer capacitances and resistance values pertaining to interfacial processes. Diffuse layer capacitance values lie in the 0.5-0.6 μF cm(-2) region and are about 1.5 times smaller than those obtained on a roughened hematite surface. Compact layer capacitances are strongly pH dependent as they pertain to the transfer of ions (charge carriers) from the diffuse layer onto surface (hydr)oxo groups. These values, alongside those of resistance adsorption, pointed a 50% decrease in proton adsorption/desorption resistance under acidic and alkaline conditions relative to that of the point of zero charge (pH 8-9). Increasing ionic strength generally induces larger diffuse layer capacitances, larger adsorption capacitances, and lower resistance values. Such a response is in line with the concept for thinner electric double layers and facilitated proton adsorption reactions by solutions of high ionic strengths. Relaxation times pertaining to the transfer of charge carriers across the compact plane induced by the EIS experiments lie in the 0.7-4.2 s range and become larger under acidic conditions. Decreases in site availability and increases in electrostatic repulsion are two possible contributing factors impeding reaction rates below the point of zero charge. Collectively, these finding are underpinning important relationships between classical views on mineral surface complexation reactions and electrochemical views of semiconductor/water interfaces.
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Affiliation(s)
- Kenichi Shimizu
- Department of Chemistry, Umeå University , Umeå SE-901 87, Sweden
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32
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Cheng K, He D, Peng T, Lv H, Pan M, Mu S. Porous graphene supported Pt catalysts for proton exchange membrane fuel cells. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.03.181] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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33
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Chiam SY, Kumar MH, Bassi PS, Seng HL, Barber J, Wong LH. Improving the efficiency of hematite nanorods for photoelectrochemical water splitting by doping with manganese. ACS APPLIED MATERIALS & INTERFACES 2014; 6:5852-9. [PMID: 24702963 DOI: 10.1021/am500643y] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Here, we report a significant improvement of the photoelectrochemical (PEC) properties of hematite (α-Fe2O3) to oxidize water by doping with manganese. Hematite nanorods were grown on a fluorine-treated tin oxide (FTO) substrate by a hydrothermal method in the presence on Mn. Systematic physical analyses were performed to investigate the presence of Mn in the samples. Fe2O3 nanorods with 5 mol % Mn treatment showed a photocurrent density of 1.6 mA cm(-2) (75% higher than that of pristine Fe2O3) at 1.23 V versus RHE and a plateau photocurrent density of 3.2 mA cm(-2) at 1.8 V versus RHE in a 1 M NaOH electrolyte solution (pH 13.6). We attribute the increase in the photocurrent density, and thus in the oxygen evolving capacity, to the increased donor density resulting from Mn doping of the Fe2O3 nanorods, as confirmed by Mott-Schottky measurement, as well as the suppression of electron-hole recombination and enhancement in hole transport, as detected by chronoamperometry measurements.
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34
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Sudheer, Quraishi MA. 2-Amino-3,5-dicarbonitrile-6-thio-pyridines: New and Effective Corrosion Inhibitors for Mild Steel in 1 M HCl. Ind Eng Chem Res 2014. [DOI: 10.1021/ie401633y] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sudheer
- Department of Chemistry, Indian Institute of Technology (Banaras Hindu University), Varanasi -221 005, India
| | - Mumtaz Ahmad Quraishi
- Department of Chemistry, Indian Institute of Technology (Banaras Hindu University), Varanasi -221 005, India
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35
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Wang T, Huang MC, Liu FW, Hsieh YK, Chang WS, Lin JC, Wang CF. Interfacial phenomena in hematite photoanodes fabricated by directly associating iron oxide suspensions with FTO substrates using a dipping-annealing method. RSC Adv 2014. [DOI: 10.1039/c3ra45692g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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36
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Wang T, Huang MC, Hsieh YK, Chang WS, Lin JC, Lee CH, Wang CF. Influence of sodium halides (NaF, NaCl, NaBr, NaI) on the photocatalytic performance of hydrothermally synthesized hematite photoanodes. ACS APPLIED MATERIALS & INTERFACES 2013; 5:7937-7949. [PMID: 23865744 DOI: 10.1021/am402024q] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
It has been suggested that a high concentration of Fe(3+) in solution, a low pH, and noncomplexing ions of high ionic strength are all essential for developing a high-quality hematite array. Our curiosity was piqued regarding the role of the electrolyte ions in the hydrothermal synthesis of hematite photoanodes. In this study, we prepared hematite photoanodes hydrothermally from precursor solutions of 0.1 M FeCl3 at pH 1.55 with a background electrolyte of 1.0 M sodium halide (NaF, NaCl, NaBr, or NaI). We compared the structures and properties of the as-obtained hematite photoanodes with those of the material prepared in 1.0 M NaNO3, the most widely adopted electrolyte in previous studies. Among our studied systems, we found that the hematite photoanode prepared in NaCl solution was the only one possessing properties similar to those of the sample obtained from the NaNO3 solution-most importantly in terms of photoelectrochemical performance (ca. 0.2 mA/cm(2) with +0.4 V vs SCE). The hematites obtained from the NaF, NaBr, and NaI solutions exhibited much lower (by approximately 2 orders of magnitude) photocurrent densities under the same conditions, possibly because of their relatively less ordered crystallinity and the absence of rodlike morphologies. Because the synthetic protocol was identical in each case, we believe that these two distinct features reflect the environments in which these hematite photoanodes were formed. Consistent with the latest studies reported in the literature of the X-ray photoelectron spectra of fast-frozen hematite colloids in aqueous solutions, it appears that the degree of surface ion loading at the electrolyte-hematite interface (Stern layer) is critical during the development of hematite photoanodes. We suspect that a lower ion surface loading benefits the hematite developing relatively higher-order and a rodlike texture, thereby improving the photoelectrochemical activity.
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Affiliation(s)
- Tsinghai Wang
- Biomedical Engineering and Environment Sciences, National Tsing Hua University, Hsinchu, Taiwan 30013
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Shimizu K, Shchukarev A, Kozin PA, Boily JF. X-ray photoelectron spectroscopy of fast-frozen hematite colloids in aqueous solutions. 5. Halide ion (F-, Cl-, Br-, I-) adsorption. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2623-2630. [PMID: 23347248 DOI: 10.1021/la3039973] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Halide anion (F(-), Cl(-), Br(-), and I(-)) adsorption and its impact on sodium adsorption at the hematite/water interface were studied by cryogenic X-ray photoelectron spectroscopy (XPS). Measurements were carried out on frozen, centrifuged wet hematite pastes that were previously equilibrated in 50 mM electrolytic solutions in the pH 2-11 range. XPS-derived halide ion surface loadings decreased in the order F(-) > I(-) ≈ Cl(-) > Br(-), whereas sodium loadings were in the order Na(F) > Na(I) > Na(Br) > Na(Cl). The greater sodium loadings in NaF and in NaI resulted from larger anion loadings in these systems. Bromide ion had the lowest loading among all halide ions despite having a charge-to-size ratio that is intermediate between those of Cl(-) and I(-). This unexpected result may have arisen from specific properties of the hematite/water interface, such as water structure and electric double layer thickness. Fluoride ion adsorption proceeded via the formation of hydrogen bonds with the surface hydroxo groups (e.g., ≡Fe-OH(2)···F(-) or ≡Fe-OH···F(-)). Surface-bound fluoride ions exert a greater charge-screening effect than the other halide anions, as demonstrated by considerably small zeta potential values. Fe-F bond formation was excluded as a possible interfacial process as the F 1s peak binding energy (684.2 eV) was more comparable to that of NaF (684.6 eV) than FeF(3) (685.4 eV). Overall, these findings motivate further refinements of existing thermodynamic adsorption models for predicting the ionic composition of hematite particle surfaces contacted with sodium halide aqueous solutions.
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Affiliation(s)
- Kenichi Shimizu
- Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden.
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Wilkinson K, Ekstrand-Hammarström B, Ahlinder L, Guldevall K, Pazik R, Kępiński L, Kvashnina KO, Butorin SM, Brismar H, Önfelt B, Österlund L, Seisenbaeva GA, Kessler VG. Visualization of custom-tailored iron oxide nanoparticles chemistry, uptake, and toxicity. NANOSCALE 2012; 4:7383-7393. [PMID: 23070150 DOI: 10.1039/c2nr32572a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Nanoparticles of iron oxide generated by wearing of vehicles have been modelled with a tailored solution of size-uniform engineered magnetite particles produced by the Bradley reaction, a solvothermal metal-organic approach rendering hydrophilic particles. The latter does not bear any pronounced surface charge in analogy with that originating from anthropogenic sources in the environment. Physicochemical properties of the nanoparticles were thoroughly characterized by a wide range of methods, including XPD, TEM, SEM, DLS and spectroscopic techniques. The magnetite nanoparticles were found to be sensitive for transformation into maghemite under ambient conditions. This process was clearly revealed by Raman spectroscopy for high surface energy magnetite particles containing minor impurities of the hydromaghemite phase and was followed by quantitative measurements with EXAFS spectroscopy. In order to assess the toxicological effects of the produced nanoparticles in humans, with and without surface modification with ATP (a model of bio-corona formed in alveolar liquid), a pathway of potential uptake and clearance was modelled with a sequence of in vitro studies using A549 lung epithelial cells, lymphocyte 221-B cells, and 293T embryonal kidney cells, respectively. Raman microscopy unambiguously showed that magnetite nanoparticles are internalized within the A549 cells after 24 h co-incubation, and that the ATP ligand is retained on the nanoparticles throughout the uptake process. The toxicity of the nanoparticles was estimated using confocal fluorescence microscopy and indicated no principal difference for unmodified and modified particles, but revealed considerably different biochemical responses. The IL-8 cytokine response was found to be significantly lower for the magnetite nanoparticles compared to TiO(2), while an enhancement of ROS was observed, which was further increased for the ATP-modified nanoparticles, implicating involvement of the ATP signalling pathway in the epithelium.
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Affiliation(s)
- Kai Wilkinson
- Department of Chemistry, SLU BioCenter, P.O. Box 7015, SE-75007 Uppsala, Sweden.
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Charging of water at inert and hydrophobic surfaces. Effect on interfacial properties of silver halides. ADSORPTION 2012. [DOI: 10.1007/s10450-012-9442-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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