1
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Photoreactivity of Deep VB Titania Attained Via Molecular Layer Deposition; Interplay of Metal Oxide Thin Film Built-in Strain and Molecular Effects. Top Catal 2020. [DOI: 10.1007/s11244-020-01390-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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2
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Bresolin BM, Hammouda SB, Sillanpää M. Methylammonium iodo bismuthate perovskite (CH3NH3)3Bi2I9 as new effective visible light-responsive photocatalyst for degradation of environment pollutants. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2019.03.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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3
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Recent advances in photoinduced catalysis for water splitting and environmental applications. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.01.004] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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4
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5
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Khan H, Zavabeti A, Wang Y, Harrison CJ, Carey BJ, Mohiuddin M, Chrimes AF, De Castro IA, Zhang BY, Sabri YM, Bhargava SK, Ou JZ, Daeneke T, Russo SP, Li Y, Kalantar-Zadeh K. Quasi physisorptive two dimensional tungsten oxide nanosheets with extraordinary sensitivity and selectivity to NO 2. NANOSCALE 2017; 9:19162-19175. [PMID: 29186236 DOI: 10.1039/c7nr05403c] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Attributing to their distinct thickness and surface dependent physicochemical properties, two dimensional (2D) nanostructures have become an area of increasing interest for interfacial interactions. Effectively, properties such as high surface-to-volume ratio, modulated surface activities and increased control of oxygen vacancies make these types of materials particularly suitable for gas-sensing applications. This work reports a facile wet-chemical synthesis of 2D tungsten oxide nanosheets by sonication of tungsten particles in an acidic environment and thermal annealing thereafter. The resultant product of large nanosheets with intrinsic substoichiometric properties is shown to be highly sensitive and selective to nitrogen dioxide (NO2) gas, which is a major pollutant. The strong synergy between polar NO2 molecules and tungsten oxide surface and also abundance of active surface sites on the nanosheets for molecule interactions contribute to the exceptionally sensitive and selective response. An extraordinary response factor of ∼30 is demonstrated to ultralow 40 parts per billion (ppb) NO2 at a relatively low operating temperature of 150 °C, within the physisorption temperature band for tungsten oxide. Selectivity to NO2 is demonstrated and the theory behind it is discussed. The structural, morphological and compositional characteristics of the synthesised and annealed materials are extensively characterised and electronic band structures are proposed. The demonstrated 2D tungsten oxide based sensing device holds the greatest promise for producing future commercial low-cost, sensitive and selective NO2 gas sensors.
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Affiliation(s)
- Hareem Khan
- School of Engineering, RMIT University, 124 La Trobe Street, Melbourne, Victoria 3000, Australia.
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6
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Ellis H, Jiang R, Ye S, Hagfeldt A, Boschloo G. Development of high efficiency 100% aqueous cobalt electrolyte dye-sensitised solar cells. Phys Chem Chem Phys 2016; 18:8419-27. [PMID: 26931779 DOI: 10.1039/c6cp00264a] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
In this study we report the application of three cobalt redox shuttles in 100% aqueous electrolyte dye-sensitised solar cells (DSCs). By using chloride as a counter-ion for cobalt bipyridine, cobalt phenanthroline and cobalt bipyridine pyrazole, the redox shuttles were made water soluble; no surfactant or further treatment was necessary. A simple system of merely the redox shuttles and 1-methylbenzimidazole (MBI) in water as an electrolyte in combination with an organic dye and a mesoporous PEDOT counter electrode was optimised. The optimisation resulted in an average efficiency of 5.5% (record efficiency of 5.7%) at 1 sun. The results of this study present promising routes for further improvements of aqueous cobalt electrolyte DSCs.
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Affiliation(s)
- Hanna Ellis
- Physical Chemistry, Center of Molecular Devices, Department of Chemistry - Ångström Laboratory, Uppsala University, SE-75120 Uppsala, Sweden.
| | - Roger Jiang
- Physical Chemistry, Center of Molecular Devices, Department of Chemistry - Ångström Laboratory, Uppsala University, SE-75120 Uppsala, Sweden.
| | - Sofie Ye
- Physical Chemistry, Center of Molecular Devices, Department of Chemistry - Ångström Laboratory, Uppsala University, SE-75120 Uppsala, Sweden.
| | - Anders Hagfeldt
- Physical Chemistry, Center of Molecular Devices, Department of Chemistry - Ångström Laboratory, Uppsala University, SE-75120 Uppsala, Sweden. and Ecole Polytechnique Federale de Lausanne, Laboratory of Photomolecular Science, Institute of Chemical Science and Engineering, EPFL-FSB-ISIC-LSPM, Station 6, CH-1015 Lausanne, Switzerland and Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah 215889, Saudi Arabia
| | - Gerrit Boschloo
- Physical Chemistry, Center of Molecular Devices, Department of Chemistry - Ångström Laboratory, Uppsala University, SE-75120 Uppsala, Sweden.
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7
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Influence of the number of anchor groups on the photophysical properties of coordination compounds as components of dye-sensitized solar cells. Russ Chem Bull 2016. [DOI: 10.1007/s11172-015-1074-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Kryman MW, Nasca JN, Watson DF, Detty MR. Selenorhodamine Dye-Sensitized Solar Cells: Influence of Structure and Surface-Anchoring Mode on Aggregation, Persistence, and Photoelectrochemical Performance. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:1521-1532. [PMID: 26791741 DOI: 10.1021/acs.langmuir.5b04275] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A library of six selenorhodamine dyes (4-Se-9-Se) were synthesized, characterized, and evaluated as photosensitizers of TiO2 in dye-sensitized solar cells (DSSCs). The dyes were constructed around either a bis(julolidyl)- or bis(half-julolidyl)-modified selenoxanthylium core functionalized at the 9-position with a thienyl group bearing a carboxylic, hydroxamic, or phosphonic acid for attachment to TiO2. Absorption bands of solvated dyes 4-Se-9-Se were red-shifted relative to the dimethylamino analogues. The dyes adsorbed to TiO2 as mixtures of monomeric and H-aggregated dyes, which exhibited broadened absorption spectra and increased light-harvesting efficiencies relative to the solvated monomeric dyes. Carboxylic acid-bearing dyes 4-Se and 7-Se initially exhibited the highest incident photon-to-current efficiencies (IPCEs) of 65-80% under monochromatic illumination, but the dyes desorbed rapidly from TiO2 into solutions of HCl (0.1 M) in a CH3CN:H2O mixed solvent (120:1 v:v). The hydroxamic acid- and phosphonic acid-bearing dyes 5-Se, 6-Se, 8-Se, and 9-Se exhibited lower IPCEs (49-65%) immediately after preparation of DSSCs; however, the dyes were vastly more inert on TiO2, and IPCEs decreased only minimally with successive measurements under constant illumination. Power-conversion efficiencies (PCEs) of the selenorhodamine-derived DSSCs were less than 1%, probably due to inefficient regeneration of the dyes following electron injection. For a given anchoring group, the bis(half-julolidyl) dyes exhibited higher open-circuit photovoltages and PCEs than the corresponding bis(julolidyl) dyes. The hydroxamic acid- and phosphonic acid-bearing dyes are intriguing photosensitizers of TiO2 in light of their aggregation-induced spectral broadening, high monochromatic IPCEs, and relative inertness to desorption into acidic media.
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Affiliation(s)
- Mark W Kryman
- Department of Chemistry, University at Buffalo, The State University of New York , Buffalo, New York 14260-3000, United States
| | - Justin N Nasca
- Department of Chemistry, University at Buffalo, The State University of New York , Buffalo, New York 14260-3000, United States
| | - David F Watson
- Department of Chemistry, University at Buffalo, The State University of New York , Buffalo, New York 14260-3000, United States
| | - Michael R Detty
- Department of Chemistry, University at Buffalo, The State University of New York , Buffalo, New York 14260-3000, United States
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9
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Visible-light activation of TiO2 photocatalysts: Advances in theory and experiments. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2015. [DOI: 10.1016/j.jphotochemrev.2015.08.003] [Citation(s) in RCA: 749] [Impact Index Per Article: 83.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Govind Rao V, Dhital B, Lu HP. Probing Driving Force and Electron Accepting State Density Dependent Interfacial Electron Transfer Dynamics: Suppressed Fluorescence Blinking of Single Molecules on Indium Tin Oxide Semiconductor. J Phys Chem B 2015; 120:1685-97. [DOI: 10.1021/acs.jpcb.5b08807] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vishal Govind Rao
- Department
of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Bharat Dhital
- Department
of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - H. Peter Lu
- Department
of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
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11
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Won DI, Lee JS, Ji JM, Jung WJ, Son HJ, Pac C, Kang SO. Highly Robust Hybrid Photocatalyst for Carbon Dioxide Reduction: Tuning and Optimization of Catalytic Activities of Dye/TiO2/Re(I) Organic–Inorganic Ternary Systems. J Am Chem Soc 2015; 137:13679-90. [DOI: 10.1021/jacs.5b08890] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Dong-Il Won
- Department of Advanced Materials
Chemistry, Korea University, Sejong 30019, Korea
| | - Jong-Su Lee
- Department of Advanced Materials
Chemistry, Korea University, Sejong 30019, Korea
| | - Jung-Min Ji
- Department of Advanced Materials
Chemistry, Korea University, Sejong 30019, Korea
| | - Won-Jo Jung
- Department of Advanced Materials
Chemistry, Korea University, Sejong 30019, Korea
| | - Ho-Jin Son
- Department of Advanced Materials
Chemistry, Korea University, Sejong 30019, Korea
| | - Chyongjin Pac
- Department of Advanced Materials
Chemistry, Korea University, Sejong 30019, Korea
| | - Sang Ook Kang
- Department of Advanced Materials
Chemistry, Korea University, Sejong 30019, Korea
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12
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Hyde JT, Hanson K, Vannucci AK, Lapides AM, Alibabaei L, Norris MR, Meyer TJ, Harrison DP. Electrochemical Instability of Phosphonate-Derivatized, Ruthenium(III) Polypyridyl Complexes on Metal Oxide Surfaces. ACS APPLIED MATERIALS & INTERFACES 2015; 7:9554-62. [PMID: 25871342 DOI: 10.1021/acsami.5b01000] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The oxidative stability of the molecular components of dye-sensitized photoelectrosynthesis cells for solar water splitting remains to be explored systematically. We report here the results of an electrochemical study on the oxidative stability of ruthenium(II) polypyridyl complexes surface-bound to fluorine-doped tin oxide electrodes in acidic solutions and, to a lesser extent, as a function of pH and solvent with electrochemical monitoring. Desorption occurs for the Ru(II) forms of the surface-bound complexes with oxidation to Ru(III) enhancing both desorption and decomposition. Based on the results of long-term potential hold experiments with cyclic voltammetry monitoring, electrochemical oxidation to Ru(III) results in slow decomposition of the complex by 2,2'-bipyridine ligand loss and aquation and/or anation. A similar pattern of ligand loss was also observed for a known chromophore-catalyst assembly for both electrochemical water oxidation and photoelectrochemical water splitting. Our results are significant in identifying the importance of enhancing chromophore stability, or at least transient stability, in oxidized forms in order to achieve stable performance in aqueous environments in photoelectrochemical devices.
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Affiliation(s)
- Jacob T Hyde
- †Department of Chemistry, Virginia Military Institute, Lexington, Virginia 24450, United States
| | - Kenneth Hanson
- ‡Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Aaron K Vannucci
- ‡Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Alexander M Lapides
- ‡Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Leila Alibabaei
- ‡Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Michael R Norris
- ‡Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Thomas J Meyer
- ‡Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Daniel P Harrison
- †Department of Chemistry, Virginia Military Institute, Lexington, Virginia 24450, United States
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13
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Ashford DL, Sherman BD, Binstead RA, Templeton JL, Meyer TJ. Electro-assembly of a Chromophore-Catalyst Bilayer for Water Oxidation and Photocatalytic Water Splitting. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201410944] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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14
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Ashford DL, Sherman BD, Binstead RA, Templeton JL, Meyer TJ. Electro-assembly of a chromophore-catalyst bilayer for water oxidation and photocatalytic water splitting. Angew Chem Int Ed Engl 2015; 54:4778-81. [PMID: 25707676 DOI: 10.1002/anie.201410944] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 12/15/2014] [Indexed: 11/10/2022]
Abstract
The use of electropolymerization to prepare electrocatalytically and photocatalytically active electrodes for water oxidation is described. Electropolymerization of the catalyst Ru(II)(bda)(4-vinylpyridine)2 (bda=2,2'-bipyridine-6,6'-dicarboxylate) on planar electrodes results in films containing semirigid polymer networks. In these films there is a change in the water oxidation mechanism compared to the solution analogue from bimolecular to single-site. Electro-assembly construction of a chromophore-catalyst structure on mesoporous, nanoparticle TiO2 films provides the basis for a dye-sensitized photoelectrosynthesis cell (DSPEC) for sustained water splitting in a pH 7 phosphate buffer solution. Photogenerated oxygen was measured in real-time by use of a two-electrode cell design.
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Affiliation(s)
- Dennis L Ashford
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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15
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Farnum BH, Morseth ZA, Brennaman MK, Papanikolas JM, Meyer TJ. Application of Degenerately Doped Metal Oxides in the Study of Photoinduced Interfacial Electron Transfer. J Phys Chem B 2015; 119:7698-711. [DOI: 10.1021/jp512624u] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Byron H. Farnum
- Department
of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - Zachary A. Morseth
- Department
of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - M. Kyle Brennaman
- Department
of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - John M. Papanikolas
- Department
of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - Thomas J. Meyer
- Department
of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
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16
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Abstract
This review highlights the efforts towards the realization of an artificial photosynthetic system able to convert sunlight into electricity by using a unique solvent, water, the solvent of life.
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Affiliation(s)
- Federico Bella
- GAME Lab
- CHENERGY Group
- Department of Applied Science and Technology – DISAT
- 10129 Torino
- Italy
| | - Claudio Gerbaldi
- GAME Lab
- CHENERGY Group
- Department of Applied Science and Technology – DISAT
- 10129 Torino
- Italy
| | - Claudia Barolo
- Department of Chemistry and NIS Interdepartmental Centre
- Università degli Studi di Torino
- 10125 Torino
- Italy
| | - Michael Grätzel
- Laboratory of Photonics and Interfaces
- Swiss Federal Institute of Technology (EPFL)
- 1015 Lausanne
- Switzerland
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17
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Rao VG, Dhital B, Peter Lu H. Single-molecule interfacial electron transfer dynamics of porphyrin on TiO2 nanoparticles: dissecting the interfacial electric field and electron accepting state density dependent dynamics. Chem Commun (Camb) 2015; 51:16821-4. [DOI: 10.1039/c5cc06451a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Single-molecule photon-stamping spectroscopy correlated with electrochemical techniques was used to dissect interfacial electron transfer dynamics by probing an m-ZnTCPP molecule anchored to a TiO2 NP surface.
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Affiliation(s)
- Vishal Govind Rao
- Department of Chemistry and Center for Photochemical Sciences
- Bowling Green State University
- Bowling Green
- USA
| | - Bharat Dhital
- Department of Chemistry and Center for Photochemical Sciences
- Bowling Green State University
- Bowling Green
- USA
| | - H. Peter Lu
- Department of Chemistry and Center for Photochemical Sciences
- Bowling Green State University
- Bowling Green
- USA
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18
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Kawano M, Nishiyama T, Ogomi Y, Pandey SS, Ma T, Hayase S. Relationship between diffusion of Co3+/Co2+ redox species in nanopores of porous titania stained with dye molecules, dye molecular structures, and photovoltaic performances. RSC Adv 2015. [DOI: 10.1039/c5ra11992h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Diffusion of Co2+ and Co3+ in nanopores of porous titania stained with dyes were evaluated. Voc was obtained for the DSSC with fast Co3+ diffusion in nanopores. After staining with long alkyl groups, the efficiency increased from 2.8% to 5.3%.
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Affiliation(s)
- Minobu Kawano
- Graduate School of Life Science and Systems Engineering
- Kyushu Institute of Technology
- Kitakyushu 808-0196
- Japan
| | - Tsubasa Nishiyama
- Graduate School of Life Science and Systems Engineering
- Kyushu Institute of Technology
- Kitakyushu 808-0196
- Japan
| | - Yuhei Ogomi
- Graduate School of Life Science and Systems Engineering
- Kyushu Institute of Technology
- Kitakyushu 808-0196
- Japan
| | - Shyam S. Pandey
- Graduate School of Life Science and Systems Engineering
- Kyushu Institute of Technology
- Kitakyushu 808-0196
- Japan
| | - Tingli Ma
- Graduate School of Life Science and Systems Engineering
- Kyushu Institute of Technology
- Kitakyushu 808-0196
- Japan
| | - Shuzi Hayase
- Graduate School of Life Science and Systems Engineering
- Kyushu Institute of Technology
- Kitakyushu 808-0196
- Japan
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19
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Calogero G, Bartolotta A, Di Marco G, Di Carlo A, Bonaccorso F. Vegetable-based dye-sensitized solar cells. Chem Soc Rev 2015; 44:3244-94. [DOI: 10.1039/c4cs00309h] [Citation(s) in RCA: 254] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In this review we provide an overview of vegetable pigments in dye-sensitized solar cells, starting from main limitations of cell performance to cost analysis and scaling-up prospects.
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Affiliation(s)
| | | | - Gaetano Di Marco
- CNR-IPCF
- Istituto per i Processi Chimico-Fisici
- 98158 Messina
- Italy
| | - Aldo Di Carlo
- CHOSE – Centre for Hybrid and Organic Solar Energy – University of Rome “Tor Vergata”
- 00133 Roma
- Italy
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20
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Chen J, Yang HB, Miao J, Wang HY, Liu B. Thermodynamically Driven One-Dimensional Evolution of Anatase TiO2 Nanorods: One-Step Hydrothermal Synthesis for Emerging Intrinsic Superiority of Dimensionality. J Am Chem Soc 2014; 136:15310-8. [DOI: 10.1021/ja5080568] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jiazang Chen
- Division of Chemical
and
Biomolecular Engineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
| | - Hong Bin Yang
- Division of Chemical
and
Biomolecular Engineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
| | - Jianwei Miao
- Division of Chemical
and
Biomolecular Engineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
| | - Hsin-Yi Wang
- Division of Chemical
and
Biomolecular Engineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
| | - Bin Liu
- Division of Chemical
and
Biomolecular Engineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
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21
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Ryan DM, Coggins MK, Concepcion JJ, Ashford DL, Fang Z, Alibabaei L, Ma D, Meyer TJ, Waters ML. Synthesis and Electrocatalytic Water Oxidation by Electrode-Bound Helical Peptide Chromophore–Catalyst Assemblies. Inorg Chem 2014; 53:8120-8. [DOI: 10.1021/ic5011488] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Derek M. Ryan
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Michael K. Coggins
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Javier J. Concepcion
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Dennis L. Ashford
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Zhen Fang
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Leila Alibabaei
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Da Ma
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Thomas J. Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Marcey L. Waters
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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22
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Metoki N, Liu L, Beilis E, Eliaz N, Mandler D. Preparation and characterization of alkylphosphonic acid self-assembled monolayers on titanium alloy by chemisorption and electrochemical deposition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:6791-6799. [PMID: 24823616 DOI: 10.1021/la404829b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Ti-6Al-4V alloy is the most commonly used alloy for dental and orthopedic implants. In order to improve osseointegration, different surface modification methods are usually employed, including self-assembled monolayers (SAMs). This study presents an investigation of both active (electroassisted) and passive (adsorption) approaches for the modification of Ti-6Al-4V using alkylphosphonic acid. The monolayers were characterized by cyclic voltammetry, double-layer capacitance, contact angle measurements, X-ray photoelectron spectroscopy, polarization modulation infrared reflection adsorption spectroscopy, electrochemical impedance spectroscopy, and corrosion potentiodynamic polarization measurements. It is shown that the electrochemically assisted monolayers, which are assembled faster, exhibit better control over surface properties, a superior degree of order, and a somewhat higher packing density. The electrosorbed SAMs also exhibit better blockage of electron transfer across the interface and thus have better corrosion resistance.
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Affiliation(s)
- Noah Metoki
- Biomaterials and Corrosion Lab, Department of Materials Science and Engineering, Tel-Aviv University , Ramat Aviv 6997801, Israel
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23
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De Angelis F, Di Valentin C, Fantacci S, Vittadini A, Selloni A. Theoretical Studies on Anatase and Less Common TiO2 Phases: Bulk, Surfaces, and Nanomaterials. Chem Rev 2014; 114:9708-53. [DOI: 10.1021/cr500055q] [Citation(s) in RCA: 321] [Impact Index Per Article: 32.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Filippo De Angelis
- Computational
Laboratory for Hybrid Organic Photovoltaics (CLHYO), Istituto CNR di Scienze e Tecnologie Molecolari, Via Elce di Sotto 8, I-06123 Perugia, Italy
| | - Cristiana Di Valentin
- Dipartimento
di Scienza dei Materiali, Università di Milano-Bicocca, I-20125 Milano, Italy
| | - Simona Fantacci
- Computational
Laboratory for Hybrid Organic Photovoltaics (CLHYO), Istituto CNR di Scienze e Tecnologie Molecolari, Via Elce di Sotto 8, I-06123 Perugia, Italy
| | - Andrea Vittadini
- Istituto
CNR per l’Energetica e le Interfasi (IENI), c/o Dipartimento
di Scienze Chimiche, Universita’ di Padova, I-35131 Padova, Italy
| | - Annabella Selloni
- Department
of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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Bai Y, Mora-Seró I, De Angelis F, Bisquert J, Wang P. Titanium Dioxide Nanomaterials for Photovoltaic Applications. Chem Rev 2014; 114:10095-130. [DOI: 10.1021/cr400606n] [Citation(s) in RCA: 592] [Impact Index Per Article: 59.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Yu Bai
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- Institute
of Chemistry and Energy Material Innovation, Academy of Fundamental
Interdisciplinary Sciences, Harbin Institute of Technology, Harbin 150080, China
| | - Iván Mora-Seró
- Photovoltaic
and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
| | - Filippo De Angelis
- Istituto
CNR di Scienze e Tecnologie Molecolari, c/o Dipartimento di Chimica, Università di Perugia, via Elce di Sotto 8, I-06123 Perugia, Italy
| | - Juan Bisquert
- Photovoltaic
and Optoelectronic Devices Group, Departament de Física, Universitat Jaume I, 12071 Castelló, Spain
| | - Peng Wang
- State
Key Laboratory of Polymer Physics and Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
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Yui T, Takeda H, Ueda Y, Sekizawa K, Koike K, Inagaki S, Ishitani O. Hybridization between periodic mesoporous organosilica and a Ru(II) polypyridyl complex with phosphonic acid anchor groups. ACS APPLIED MATERIALS & INTERFACES 2014; 6:1992-1998. [PMID: 24447104 DOI: 10.1021/am405065a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A new method for the hybridization of a ruthenium(II) polypyridyl complex ([Ru(bpy)2((CH2PO3H2)2-bpy)](2+) (RuP2(2+): bpy =2,2'-bipyridine; (CH2PO3H2)2-bpy =2,2'-bipyridine-4,4'di(metylphosphonic acid)) with biphenylene-bearing periodic mesoporous organosilica (Bp-PMO made from 4,4'bis(triethoxysilyl)biphenyl [(C2H5O)3Si-(C6H4)2-Si(OC2H5)3]) was developed. Efficient and secure fixation of the ruthenium(II) complex with methylphosphonic acid groups (RuP2(2+)) in the mesopores of Bp-PMO occurred. This method introduced up to 660 μmol of RuP2(2+) in 1 g of Bp-PMO. Two modes of adsorption of RuP2(2+) in the mesopores of Bp-PMO were observed: one is caused by the chemical interaction between the methylphosphonic acid groups of RuP2(2+) and the silicate moieties of Bp-PMO and the other is attributed to aggregation of the RuP2(2+) complexes. In the case of the former mode, adsorbed RuP2(2+) (up to 80-100 μmol g(-1)) did not detach from Bp-PMO after washing with acetonitrile, dimethylformamide, or even water. Emission from the excited biphenylene (Bp) units was quantitatively quenched by the adsorbed RuP2(2+) molecules in cases where more than 60 μmol g(-1) of RuP2(2+) was adsorbed, and emission from RuP2(2+) was observed. Quantitative emission measurements indicated that emission from approximately 100 Bp units can be completely quenched by only one RuP2(2+) molecule in the mesopore, and photons absorbed by approximately 400 Bp units are potentially accumulated in one RuP2(2+) molecule.
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Affiliation(s)
- Tatsuto Yui
- Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology , 2-12-1-NE1 O-okayama, Meguro-ku, Tokyo 152-8550, Japan
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26
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Shalabi A, Abdel Aal S, El Mahdy A. The effect of ruthenium on the performance of porphyrin dye and porphyrin–fullerene dyad solar cells predicted by DFT and TD-DFT calculations. MOLECULAR SIMULATION 2013. [DOI: 10.1080/08927022.2012.758853] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Banerjee T, Kaniyankandy S, Das A, Ghosh HN. Synthesis, Steady-State, and Femtosecond Transient Absorption Studies of Resorcinol Bound Ruthenium(II)- and Osmium(II)-polypyridyl Complexes on Nano-TiO2 Surface in Water. Inorg Chem 2013; 52:5366-77. [DOI: 10.1021/ic4003548] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Tanmay Banerjee
- Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India
| | - Sreejith Kaniyankandy
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Amitava Das
- Central Salt and Marine Chemicals Research Institute, Bhavnagar 364002, India
| | - Hirendra Nath Ghosh
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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28
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Banerjee T, Das A, Ghosh HN. Interfacial charge recombination of Os(ii)–polypyridyl–resorcinol complex on oleic acid capped TiO2 surface: what determines the dynamics? NEW J CHEM 2013. [DOI: 10.1039/c3nj00550j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Pastore M, De Angelis F. Modeling Materials and Processes in Dye-Sensitized Solar Cells: Understanding the Mechanism, Improving the Efficiency. Top Curr Chem (Cham) 2013; 352:151-236. [DOI: 10.1007/128_2013_468] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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30
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Ashford DL, Song W, Concepcion JJ, Glasson CRK, Brennaman MK, Norris MR, Fang Z, Templeton JL, Meyer TJ. Photoinduced electron transfer in a chromophore-catalyst assembly anchored to TiO2. J Am Chem Soc 2012; 134:19189-98. [PMID: 23101955 DOI: 10.1021/ja3084362] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Photoinduced formation, separation, and buildup of multiple redox equivalents are an integral part of cycles for producing solar fuels in dye-sensitized photoelectrosynthesis cells (DSPECs). Excitation wavelength-dependent electron injection, intra-assembly electron transfer, and pH-dependent back electron transfer on TiO(2) were investigated for the molecular assembly [((PO(3)H(2)-CH(2))-bpy)(2)Ru(a)(bpy-NH-CO-trpy)Ru(b)(bpy)(OH(2))](4+) ([TiO(2)-Ru(a)(II)-Ru(b)(II)-OH(2)](4+); ((PO(3)H(2)-CH(2))(2)-bpy = ([2,2'-bipyridine]-4,4'-diylbis(methylene))diphosphonic acid); bpy-ph-NH-CO-trpy = 4-([2,2':6',2″-terpyridin]-4'-yl)-N-((4'-methyl-[2,2'-bipyridin]-4-yl)methyl) benzamide); bpy = 2,2'-bipyridine). This assembly combines a light-harvesting chromophore and a water oxidation catalyst linked by a synthetically flexible saturated bridge designed to enable long-lived charge-separated states. Following excitation of the chromophore, rapid electron injection into TiO(2) and intra-assembly electron transfer occur on the subnanosecond time scale followed by microsecond-millisecond back electron transfer from the semiconductor to the oxidized catalyst, [TiO(2)(e(-))-Ru(a)(II)-Ru(b)(III)-OH(2)](4+)→[TiO(2)-Ru(a)(II)-Ru(b)(II)-OH(2)](4+).
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Affiliation(s)
- Dennis L Ashford
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, North Carolina 27599-3290, USA
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31
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Mulhern KR, Orchard A, Watson DF, Detty MR. Influence of surface-attachment functionality on the aggregation, persistence, and electron-transfer reactivity of chalcogenorhodamine dyes on TiO2. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:7071-7082. [PMID: 22475038 DOI: 10.1021/la300668k] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Chalcogenorhodamine dyes bearing phosphonic acids and carboxylic acids were compared as sensitizers of nanocrystalline TiO(2) in dye-sensitized solar cells (DSSCs). The dyes were constructed around a 3,6-bis(dimethylamino)chalcogenoxanthylium core and varied in the 9 substituent: 5-carboxythien-2-yl in dyes 1-E (E = O, Se), 4-carboxyphenyl in dyes 2-E (E = O, S), 5-phosphonothien-2-yl in dyes 3-E (E = O, Se), and 4-phosphonophenyl in dyes 4-E (E = O, Se). All dyes adsorbed to TiO(2) as mixtures of H aggregates and monomers, which exhibited broadened absorption spectra relative to those of purely amorphous monolayers. Surface coverages of dyes and the extent of H aggregation varied minimally with the surface-attachment functionality, the structure of the 9-aryl group, and the identity of the chalcogen heteroatom. Carboxylic acid-functionalized dyes 1-E and 2-E desorbed rapidly and completely from TiO(2) into acidified CH(3)CN, but phosphonic acid-functionalized dyes 3-E and 4-E persisted on TiO(2) for days. Short-circuit photocurrent action spectra of DSSCs corresponded closely to the absorptance spectra of dye-functionalized films; thus, H aggregation did not decrease the electron-injection yield or charge-collection efficiency. Maximum monochromatic incident photon-to-current efficiencies (IPCEs) of DSSCs ranged from 53 to 95% and were slightly higher for carboxylic acid-functionalized dyes 1-E and 2-E. Power-conversion efficiencies of DSSCs under white-light illumination were low (<1%), suggesting that dye regeneration was inefficient at high light intensities. The photoelectrochemical performance (under monochromatic or white-light illumination) of 1-E and 2-E decayed significantly within 20-80 min of the assembly of DSSCs, primarily because of the desorption of the dyes. In contrast, the performance of phosphonic acid-functionalized dyes remained stable or improved slightly on similar timescales. Thus, replacing carboxylic acids with phosphonic acids increased the inertness of chalcogenorhodamine-TiO(2) interfaces without greatly impacting the aggregation of dyes or the interfacial electron-transfer reactivity.
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Affiliation(s)
- Kacie R Mulhern
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
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32
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Queffélec C, Petit M, Janvier P, Knight DA, Bujoli B. Surface modification using phosphonic acids and esters. Chem Rev 2012; 112:3777-807. [PMID: 22530923 DOI: 10.1021/cr2004212] [Citation(s) in RCA: 557] [Impact Index Per Article: 46.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Clémence Queffélec
- LUNAM Université, CNRS, UMR, Chimie Et Interdisciplinarité: Synthèse Analyse Modélisation, UFR Sciences et Techniques, Nantes, France
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33
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Theoretical studies of the structures and spectroscopic properties of the photoelectrochemical cell ruthenium sensitizers, C101 and J13. Sci China Chem 2012. [DOI: 10.1007/s11426-011-4483-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Vougioukalakis GC, Philippopoulos AI, Stergiopoulos T, Falaras P. Contributions to the development of ruthenium-based sensitizers for dye-sensitized solar cells. Coord Chem Rev 2011. [DOI: 10.1016/j.ccr.2010.11.006] [Citation(s) in RCA: 180] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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35
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Brennaman MK, Patrocinio AOT, Song W, Jurss JW, Concepcion JJ, Hoertz PG, Traub MC, Iha NYM, Meyer TJ. Interfacial electron transfer dynamics following laser flash photolysis of [Ru(bpy)2((4,4'-PO3H2)2bpy)]2+ in TiO2 nanoparticle films in aqueous environments. CHEMSUSCHEM 2011; 4:216-227. [PMID: 21328552 DOI: 10.1002/cssc.201000356] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Nanosecond laser flash photolysis has been used to investigate injection and back electron transfer from the complex [(Ru(bpy)(2)(4,4'-(PO(3)H(2))(2)bpy)](2+) surface-bound to TiO(2) (TiO(2)-Ru(II)). The measurements were conducted under conditions appropriate for water oxidation catalysis by known single-site water oxidation catalysts. Systematic variations in average lifetimes for back electron transfer, <τ(bet)>, were observed with changes in pH, surface coverage, incident excitation intensity, and applied bias. The results were qualitatively consistent with a model involving rate-limiting thermal activation of injected electrons from trap sites to the conduction band or shallow trap sites followed by site-to-site hopping and interfacial electron transfer, TiO(2)(e(-))-Ru(3+) → TiO(2)-Ru(2+). The appearance of pH-dependent decreases in the efficiency of formation of TiO(2)-Ru(3+) and in incident-photon-to-current efficiencies with the added reductive scavenger hydroquinone point to pH-dependent back electron transfer processes on both the sub-nanosecond and millisecond-microsecond time scales, which could be significant in limiting long-term storage of multiple redox equivalents.
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Affiliation(s)
- M Kyle Brennaman
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA.
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36
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Ziółek M, Tacchini I, Martínez MT, Yang X, Sun L, Douhal A. A photo-induced electron transfer study of an organic dye anchored on the surfaces of TiO2 nanotubes and nanoparticles. Phys Chem Chem Phys 2011; 13:4032-44. [DOI: 10.1039/c0cp01898h] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Griffith CS, De Los Reyes M, Scales N, Hanna JV, Luca V. Hybrid inorganic-organic adsorbents Part 1: Synthesis and characterization of mesoporous zirconium titanate frameworks containing coordinating organic functionalities. ACS APPLIED MATERIALS & INTERFACES 2010; 2:3436-3446. [PMID: 21073158 DOI: 10.1021/am100891u] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A series of functional hybrid inorganic-organic adsorbent materials have been prepared through postsynthetic grafting of mesoporous zirconium titanate xerogel powders using a range of synthesized and commercial mono-, bis-, and tris-phosphonic acids, many of which have never before been investigated for the preparation of hybrid phases. The hybrid materials have been characterized using thermogravimetric analysis, diffuse reflectance infrared (DRIFT) and 31P MAS NMR spectroscopic techniques and their adsorption properties studied using a 153Gd radiotracer. The highest level of surface functionalization (molecules/nm2) was observed for methylphosphonic acid (∼3 molecules/nm2). The level of functionalization decreased with an increase in the number of potential surface coordinating groups of the phosphonic acids. Spectral decomposition of the DRIFT and 31P MAS NMR spectra showed that each of the phosphonic acid molecules coordinated strongly to the metal oxide surface but that for the 1,1-bis-phosphonic acids and tris-phosphonic acids the coordination was highly variable resulting in a proportion of free or loosely coordinated phosphonic acid groups. Functionalization of a porous mixed metal oxide framework with the tris-methylenephosphonic acid (ATMP-ZrTi-0.33) resulted in a hybrid with the highest affinity for 153Gd3+ in nitric acid solutions across a wide range of acid concentrations. The ATMP-ZrTi-0.33 hybrid material extracted 153Gd3+ with a Kd value of 1×10(4) in 0.01 M HNO3 far exceeding that of the other hybrid phases. The unfunctionalized mesoporous mixed metal oxide had negligible affinity for Gd3+ (Kd<100) under identical experimental conditions. It has been shown that the presence of free or loosely coordinated phosphonic acid groups does not necessarily translate to affinity for 153Gd3+. The theoretical cation exchange capacity of the ATMP-ZrTi-0.33 hybrid phase for Gd3+ has been determined to be about 0.005 mmol/g in 0.01 M HNO3. This behavior and that of the other hybrid phases suggests that the surface-bound ATMP ligand functions as a chelating ligand toward 153Gd3+ under these acidic conditions.
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Affiliation(s)
- Christopher S Griffith
- Institute of Materials Engineering and ANSTO Minerals, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, New South Wales 2232, Australia
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38
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Hagfeldt A, Boschloo G, Sun L, Kloo L, Pettersson H. Dye-sensitized solar cells. Chem Rev 2010; 110:6595-663. [PMID: 20831177 DOI: 10.1021/cr900356p] [Citation(s) in RCA: 4261] [Impact Index Per Article: 304.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anders Hagfeldt
- Department of Physical and Analytical Chemistry, Uppsala University, Box 259, SE-751 05 Uppsala, Sweden.
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39
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Jung YS, Yoo B, Lim MK, Lee SY, Kim KJ. Effect of Triton X-100 in water-added electrolytes on the performance of dye-sensitized solar cells. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2009.06.006] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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40
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Zhang S, Li L, Zhao H. A portable photoelectrochemical probe for rapid determination of chemical oxygen demand in wastewaters. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2009; 43:7810-7815. [PMID: 19921898 DOI: 10.1021/es901320a] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A photoelectrochemical probe for rapid determination of chemical oxygen demand (COD) is developed using a nanostructured mixed-phase TiO2 photoanode, namely PeCOD probe. A UV-LED light source and a USB mircroelectrochemical station are powered and controlled by a laptop computer, which makes the probe portable for onsite COD analyses. The photoelectrochemical measurement of COD was optimized in terms of light intensity, applied bias, and pH. Under the optimized conditions, the net steady state currents originated from the oxidation of organic compounds were found to be directly proportional to COD concentrations. A practical detection limit of 0.2 ppm COD and a linear range of 0-120 ppm COD were achieved. The analytical method using the portable PeCOD probe has the advantages of being rapid, low cost, robust, user-friendly, and environmental friendly. It has been successfully applied to determine the COD values of the synthetic samples consisting of potassium hydrogen phthalate, D-glucose, glutamic acid, glutaric acid, succinic acid, and malonic acid, and real samples from various industries, such as bakery, oil and grease manufacturer, poultry, hotel, fine food factory, and fresh food producer, commercial bread manufacturer. Excellent agreement between the proposed method and the conventional COD method (dichromate) was achieved.
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Affiliation(s)
- Shanqing Zhang
- Australian Rivers Institute, The Griffith School of Environment, Griffith University, QLD 4222, Australia.
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41
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Wang Y, Wang X, Lu HP. Probing Single-Molecule Interfacial Geminate Electron−Cation Recombination Dynamics. J Am Chem Soc 2009; 131:9020-5. [DOI: 10.1021/ja902640q] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuanmin Wang
- Bowling Green State University, Center for Photochemical Sciences, Department of Chemistry, Bowling Green, Ohio 43403
| | - Xuefei Wang
- Bowling Green State University, Center for Photochemical Sciences, Department of Chemistry, Bowling Green, Ohio 43403
| | - H. Peter Lu
- Bowling Green State University, Center for Photochemical Sciences, Department of Chemistry, Bowling Green, Ohio 43403
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42
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Taffa D, Kathiresan M, Walder L. Tuning the hydrophilic, hydrophobic, and ion exchange properties of mesoporous TiO2. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:5371-5379. [PMID: 19334720 DOI: 10.1021/la8038126] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Alkyl phosphonic acids (Pho-C(n)-R) of different chain length (6, 10, and 14 carbons) bearing neutral, positive, and negatively charged head groups (R = -H, R(-) = sulfonate, R(+) = pyridinium) were prepared and anchored to the inner walls of randomly sintered mesoporous TiO(2) thin films. Quartz crystal microbalance (QCM) and Fourier transform infrared (FT-IR) measurements show that a monolayer coverage was achieved. The monolayer crystallinity is lower as compared to alkyl thiols on gold, but it increases with the length of the carbon chain. The neutral phosphonic acid modifier makes the TiO(2) highly hydrophobic and suppresses electrochemistry in aqueous media, and the alkyl phosphonic acids with charged head groups render the TiO(2) film as an ion exchanger with a phase separated hydrophilic and hydrophobic portion. Different charged guest molecules were incorporated on top or into the supported membranes. The host-guest interactions were found to be electrostatic, hydrophobic, or both. Highly charged electroactive metal complexes ([Fe(CN)(6)](4-), [IrCl(6)](2-)) and purpose-synthesized organic electrochromophores (dialkylated viologens with variable chain length, C(1)-V(+2)-C(n), C(n)-V(+2)-C(n), n = 6, 10, and 14) were used as molecular guests, and the assemblies were characterized by cyclic voltammetry and FT-IR. Using the preconcentration phenomenon, [Fe(CN)(6)](4-) concentration as low as 200 nM can be detected on a Pho-C(14)-R(+) modified TiO(2) electrode by conventional cyclic voltammetry. The new surface modification technique simplifies the molecular requirements for functional surface modifiers considerably. Using a limited set of organic anchors with orthogonal coordination properties and adjustable hydrophobicity, a broad range of electrochromophores, redox active wiring compounds, or sensitizers can be adsorbed onto TiO(2).
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Affiliation(s)
- Derejehailu Taffa
- Institute of Chemistry, University of Osnabruck, Barbarastrasse. 7, D-49069 Osnabruck, Germany
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43
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Liu G, Yan X, Chen Z, Wang X, Wang L, Lu GQ, Cheng HM. Synthesis of rutile–anatase core–shell structured TiO2 for photocatalysis. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b902666e] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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44
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Ardo S, Meyer GJ. Photodriven heterogeneous charge transfer with transition-metal compounds anchored to TiO2 semiconductor surfaces. Chem Soc Rev 2008; 38:115-64. [PMID: 19088971 DOI: 10.1039/b804321n] [Citation(s) in RCA: 657] [Impact Index Per Article: 41.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A critical review of light-driven interfacial charge-transfer reactions of transition-metal compounds anchored to mesoporous, nanocrystalline TiO2 (anatase) thin films is described. The review highlights molecular insights into metal-to-ligand charge transfer (MLCT) excited states, mechanisms of interfacial charge separation, inter- and intra-molecular electron transfer, and interfacial charge-recombination processes that have been garnered through various spectroscopic and electrochemical techniques. The relevance of these processes to optimization of solar-energy-conversion efficiencies is discussed (483 references).
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Affiliation(s)
- Shane Ardo
- Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA
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45
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Reynal A, Forneli A, Martinez-Ferrero E, Sánchez-Díaz A, Vidal-Ferran A, O’Regan BC, Palomares E. Interfacial Charge Recombination Between e−−TiO2 and the I−/I3− Electrolyte in Ruthenium Heteroleptic Complexes: Dye Molecular Structure−Open Circuit Voltage Relationship. J Am Chem Soc 2008; 130:13558-67. [DOI: 10.1021/ja800513m] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anna Reynal
- ICREA and Institute of Chemical Research of Catalonia (ICIQ), Avda. Països Catalans 16, Tarragona, Spain, and Chemistry Department, Imperial College of London, South Kensington, Exhibition Road, SW7 2AZ London, United Kingdom
| | - Amparo Forneli
- ICREA and Institute of Chemical Research of Catalonia (ICIQ), Avda. Països Catalans 16, Tarragona, Spain, and Chemistry Department, Imperial College of London, South Kensington, Exhibition Road, SW7 2AZ London, United Kingdom
| | - Eugenia Martinez-Ferrero
- ICREA and Institute of Chemical Research of Catalonia (ICIQ), Avda. Països Catalans 16, Tarragona, Spain, and Chemistry Department, Imperial College of London, South Kensington, Exhibition Road, SW7 2AZ London, United Kingdom
| | - Antonio Sánchez-Díaz
- ICREA and Institute of Chemical Research of Catalonia (ICIQ), Avda. Països Catalans 16, Tarragona, Spain, and Chemistry Department, Imperial College of London, South Kensington, Exhibition Road, SW7 2AZ London, United Kingdom
| | - Antón Vidal-Ferran
- ICREA and Institute of Chemical Research of Catalonia (ICIQ), Avda. Països Catalans 16, Tarragona, Spain, and Chemistry Department, Imperial College of London, South Kensington, Exhibition Road, SW7 2AZ London, United Kingdom
| | - Brian C. O’Regan
- ICREA and Institute of Chemical Research of Catalonia (ICIQ), Avda. Països Catalans 16, Tarragona, Spain, and Chemistry Department, Imperial College of London, South Kensington, Exhibition Road, SW7 2AZ London, United Kingdom
| | - Emilio Palomares
- ICREA and Institute of Chemical Research of Catalonia (ICIQ), Avda. Països Catalans 16, Tarragona, Spain, and Chemistry Department, Imperial College of London, South Kensington, Exhibition Road, SW7 2AZ London, United Kingdom
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46
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Peter LM, Vanmaekelbergh D. Time and Frequency Resolved Studies of Photoelectrochemical Kinetics. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/9783527616800.ch2] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abbotto A, Barolo C, Bellotto L, Angelis FD, Grätzel M, Manfredi N, Marinzi C, Fantacci S, Yum JH, Nazeeruddin MK. Electron-rich heteroaromatic conjugated bipyridine based ruthenium sensitizer for efficient dye-sensitized solar cells. Chem Commun (Camb) 2008:5318-20. [DOI: 10.1039/b811378e] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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De Angelis F, Fantacci S, Selloni A, Grätzel M, Nazeeruddin MK. Influence of the sensitizer adsorption mode on the open-circuit potential of dye-sensitized solar cells. NANO LETTERS 2007; 7:3189-95. [PMID: 17854229 DOI: 10.1021/nl071835b] [Citation(s) in RCA: 153] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
We report a combined experimental and theoretical study on the origin of the different open circuit potentials observed in dye-sensitized solar cells using Ru(II)-polypyridyl homoleptic and heteroleptic sensitizers. We have measured the photovoltaic data of different sensitizers and used DFT calculations to analyze the electronic structure of dye-sensitized TiO(2) nanoparticles. Heteroleptic sensitizers adsorb onto TiO(2) via a single bipyridine, leading to a TiO(2) conduction band downshift and overall reduction of the cell open circuit potential.
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Affiliation(s)
- Filippo De Angelis
- Istituto CNR di Scienze e Tecnologie Molecolari (ISTM-CNR), c/o Dipartimento di Chimica, Università di Perugia, Via elce di Sotto 8, I-06213, Perugia, Italy.
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Park H, Bae E, Lee JJ, Park J, Choi W. Effect of the anchoring group in Ru-bipyridyl sensitizers on the photoelectrochemical behavior of dye-sensitized TiO2 electrodes: carboxylate versus phosphonate linkages. J Phys Chem B 2007; 110:8740-9. [PMID: 16640430 DOI: 10.1021/jp060397e] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effects of the number of anchoring groups (carboxylate vs phosphonate) in Ru-bipyridyl complexes on their binding to TiO(2) surface and the photoelectrochemical performance of the sensitized TiO(2) electrodes were systematically investigated. Six derivatives of Ru-bipyridyl complexes having di-, tetra-, or hexacarboxylate (C2, C4, and C6) and di-, tetra-, or hexaphosphonate (P2, P4, and P6) as the anchoring group were synthesized. The properties and efficiencies of C- and P-complexes as a sensitizer depended on the number of anchoring groups in very different ways. Although C4 exhibited the lowest visible light absorption, C4-TiO(2) electrode showed the best cell performance and stability among C-TiO(2) electrodes. However, P6, which has the highest visible light absorption, was more efficient than P2 and P4 as a sensitizer of TiO(2). The surface binding (strength and stability) of C-complexes on TiO(2) is highly influenced by the number of carboxylate groups and is the most decisive factor in controlling the sensitization efficiency. A phosphonate anchor, however, can provide a stronger chemical linkage to TiO(2) surface, and the overall sensitization performance was less influenced by the adsorption capability of P-complexes. The apparent effect of the anchoring group number on the P-complex sensitization seems to be mainly related with the visible light absorption efficiency of each P-complex.
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Affiliation(s)
- Hyunwoong Park
- School of Environmental Science and Engineering and Department of Chemistry, Pohang University of Science and Technology, Pohang 790-784, South Korea
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Affiliation(s)
- Xiaobo Chen
- Lawrence Berkeley National Laboratory, and University of California, Berkeley, California 94720
| | - Samuel S. Mao
- Lawrence Berkeley National Laboratory, and University of California, Berkeley, California 94720
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