1
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Cogan NB, McClelland KP, Peter CYM, Carmenate Rodríguez C, Fertig AA, Amin M, Brennessel WW, Krauss TD, Matson EM. Efficient Hole Transfer from CdSe Quantum Dots Enabled by Oxygen-Deficient Polyoxovanadate-Alkoxide Clusters. NANO LETTERS 2023; 23:10221-10227. [PMID: 37935022 PMCID: PMC10683070 DOI: 10.1021/acs.nanolett.3c02749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 10/25/2023] [Accepted: 10/26/2023] [Indexed: 11/09/2023]
Abstract
A limitation of the implementation of cadmium chalcogenide quantum dots (QDs) in charge transfer systems is the efficient removal of photogenerated holes. Rapid hole transfer has typically required the ex situ functionalization of hole acceptors with groups that can coordinate to the surface of the QD. In addition to being synthetically limiting, this strategy also necessitates a competitive binding equilibrium between the hole acceptor and native, solubilizing ligands on the nanocrystal. Here we show that the incorporation of oxygen vacancies into polyoxovanadate-alkoxide clusters improves hole transfer kinetics by promoting surface interactions between the metal oxide assembly and the QD. Investigating the reactivity of oxygen-deficient clusters with phosphonate-capped QDs reveals reversible complexation of the POV-alkoxide with a phosphonate ligand at the nanocrystal surface. These findings reveal a new method of facilitating QD-hole acceptor association that bypasses the restrictions of exchange interactions.
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Affiliation(s)
- Nicole
M. B. Cogan
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Kevin P. McClelland
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Chari Y. M. Peter
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | | | - Alex A. Fertig
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Mitesh Amin
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - William W. Brennessel
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Todd D. Krauss
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
- Institute
of Optics, University of Rochester, Rochester, New York 14627, United States
| | - Ellen M. Matson
- Department
of Chemistry, University of Rochester, Rochester, New York 14627, United States
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2
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Agbeworvi G, Zaheer W, Handy JV, Andrews JL, Perez-Beltran S, Jaye C, Weiland C, Fischer DA, Balbuena PB, Banerjee S. Toggling Stereochemical Activity through Interstitial Positioning of Cations between 2D V 2O 5 Double Layers. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2023; 35:7175-7188. [PMID: 38357226 PMCID: PMC10862490 DOI: 10.1021/acs.chemmater.3c01463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 08/12/2023] [Indexed: 02/16/2024]
Abstract
The 5/6s2 lone-pair electrons of p-block cations in their lower oxidation states are a versatile electronic and geometric structure motif that can underpin lattice anharmonicity and often engender electronic and structural instabilities that underpin the function of active elements in nonlinear optics, thermochromics, thermoelectrics, neuromorphic computing, and photocatalysis. In contrast to periodic solids where lone-pair-bearing cations are part of the structural framework, installing lone-pair-bearing cations in the interstitial sites of intercalation hosts provides a means of a systematically modulating electronic structure through the choice of the group and the period of the inserted cation while preserving the overall framework connectivity. The extent of stereochemical activity and the energy positioning of lone-pair-derived mid-gap states depend on the cation identity, stoichiometry, and strength of anion hybridization. V2O5 polymorphs are versatile insertion hosts that can accommodate a broad range of s-, p-, and d-block cations. However, the insertion of lone-pair-bearing cations remains largely underexplored. In this article, we examine the implications of varying the 6s2 cations situated in interlayer sites between condensed [V4O10]n double layers. Systematic modulations of lattice distortions, electronic structure, and magnetic ordering are observed with increasing strength of stereochemical activity from group 12 to group 14 cations. We compare and contrast p-block-layered MxV2O5 (M = Hg, Tl, and Pb) compounds and map the significance of local off-centering arising from the stereochemical activity of lone-pair cations to the emergence of filled antibonding lone-pair 6s2-O 2p-hybridized mid-gap states mediated by second-order Jahn-Teller distortions. Crystallographic studies of cation coordination environments and the resulting modulation of V-V interactions have been used in conjunction with variable-energy hard X-ray photoelectron spectroscopy measurements, first-principles electronic structure calculations, and crystal orbital Hamilton population analyses to decipher the origins of stereochemical activity. Magnetic susceptibility measurements reveal antiferromagnetic signatures for all the three compounds. However, the differences in V-V interactions significantly affect the energy balance of the superexchange interactions, resulting in an ordering temperature of 160 and 260 K for Hg0.5V2O5 and δ-Tl0.5V2O5, respectively, as compared to 7 K for δ-Pb0.5V2O5. In δ-Pb0.5V2O5, the strong stereochemical activity of electron lone pairs and the resulting electrostatic repulsions enforce superlattice ordering, which strongly modifies the electronic localization patterns along the [V4O10] slabs, resulting in disrupted magnetic ordering and an anomalously low ordering temperature. The results demonstrate a versatile strategy for toggling the stereochemical activity of electron lone pairs to modify the electronic structure near the Fermi level and to mediate superexchange interactions.
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Affiliation(s)
- George Agbeworvi
- Department
of Chemistry and Department of Material Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Wasif Zaheer
- Department
of Chemistry and Department of Material Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Joseph V. Handy
- Department
of Chemistry and Department of Material Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Justin L. Andrews
- Department
of Chemistry and Department of Material Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Saul Perez-Beltran
- Department
of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Cherno Jaye
- Material
Measurement Laboratory, National Institute
of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Conan Weiland
- Material
Measurement Laboratory, National Institute
of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Daniel A. Fischer
- Material
Measurement Laboratory, National Institute
of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Perla B. Balbuena
- Department
of Chemical Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Sarbajit Banerjee
- Department
of Chemistry and Department of Material Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
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3
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Rothfuss ARM, Ayala JR, Handy JV, McGranahan CR, García-Pedraza KE, Banerjee S, Watson DF. Linker-Assisted Assembly of Ligand-Bridged CdS/MoS 2 Heterostructures: Tunable Light-Harvesting Properties and Ligand-Dependent Control of Charge-Transfer Dynamics and Photocatalytic Hydrogen Evolution. ACS APPLIED MATERIALS & INTERFACES 2023; 15:39966-39979. [PMID: 37561966 DOI: 10.1021/acsami.3c06722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
We used linker-assisted assembly (LAA) to tether CdS quantum dots (QDs) to MoS2 nanosheets via L-cysteine (cys) or mercaptoalkanoic acids (MAAs) of varying lengths, yielding ligand-bridged CdS/MoS2 heterostructures for redox photocatalysis. LAA afforded precise control over the light-harvesting properties of QDs within heterostructures. Photoexcited CdS QDs transferred electrons to molecularly linked MoS2 nanosheets from both band-edge and trap states; the electron-transfer dynamics was tunable with the properties of bridging ligands. Rate constants of electron transfer, estimated from time-correlated single photon counting (TCSPC) measurements, ranged from (9.8 ± 3.8) × 106 s-1 for the extraction of electrons from trap states within heterostructures incorporating the longest MAAs to >5 × 109 s-1 for the extraction of electrons from band-edge or trap states in heterostructures with cys or 3-mercaptopropionic acid (3MPA) linkers. Ultrafast transient absorption measurements revealed that electrons were transferred within 0.5-2 ps or less for CdS-cys-MoS2 and CdS-3MPA-MoS2 heterostructures, corresponding to rate constants ≥5 × 109 s-1. Photoinduced CdS-to-MoS2 electron transfer could be exploited in photocatalytic hydrogen evolution reaction (HER) via the reduction of H+ to H2 in concert with the oxidation of lactic acid. CdS-L-MoS2-functionalized FTO electrodes promoted HER under oxidative conditions wherein H2 was evolved at a Pt counter electrode with Faradaic efficiencies of 90% or higher and under reductive conditions wherein H2 was evolved at the CdS-L-MoS2-heterostructure-functionalized working electrode with Faradaic efficiencies of 25-40%. Dispersed CdS-L-MoS2 heterostructures promoted photocatalytic HER (15.1 μmol h-1) under white-light illumination, whereas free cys-capped CdS QDs produced threefold less H2 and unfunctionalized MoS2 nanosheets produced no measurable H2. Charge separation across the CdS/MoS2 interface is thus pivotal for redox photocatalysis. Our results reveal that LAA affords tunability of the properties of constituent CdS QDs and MoS2 nanosheets and precise, programmable, ligand-dependent control over the assembly, interfacial structure, charge-transfer dynamics, and photocatalytic reactivity of CdS-L-MoS2 heterostructures.
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Affiliation(s)
- Arianna R M Rothfuss
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
| | - Jaime R Ayala
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3012, United States
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843-3012, United States
| | - Joseph V Handy
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3012, United States
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843-3012, United States
| | - Caitlin R McGranahan
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
| | - Karoline E García-Pedraza
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
| | - Sarbajit Banerjee
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3012, United States
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843-3012, United States
| | - David F Watson
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
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4
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Mehtab A, Banerjee S, Mao Y, Ahmad T. Type-II CuFe 2O 4/Graphitic Carbon Nitride Heterojunctions for High-Efficiency Photocatalytic and Electrocatalytic Hydrogen Generation. ACS APPLIED MATERIALS & INTERFACES 2022; 14:44317-44329. [PMID: 36136758 DOI: 10.1021/acsami.2c11140] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Solar water splitting has emerged as an urgent imperative as hydrogen emerges as an increasingly important form of energy storage. g-C3N4 is an ideal candidate for photocatalytic water splitting as a result of the excellent alignment of its band edges with water redox potentials. To mitigate electron-hole recombination that has limited the performance of g-C3N4, we have developed a semiconductor heterostructure of g-C3N4 with CuFe2O4 nanoparticles (NPs) as a highly efficient photocatalyst. Visible-light-driven photocatalytic properties of CuFe2O4/g-C3N4 heterostructures with different CuFe2O4 loadings have been examined with two sacrificial agents. An up to 2.5-fold enhancement in catalytic efficiency is observed for CuFe2O4/g-C3N4 heterostructures over g-C3N4 nanosheets alone with the apparent quantum yield of H2 production approaching 25%. The improved photocatalytic activity of the heterostructures suggests that introducing CuFe2O4 NPs provides more active sites and reduces electron-hole recombination. The g-C3N4/CuFe2O4 heterostructures furthermore show enhanced electrocatalytic HER activity as compared to the individual components as a result of which by making heterostructures g-C3N4 with CuFe2O4 increased the active catalytic surface for the electrocatalytic water splitting reaction. The enhanced faradaic efficiency of the prepared heterostructures makes it a potential candidate for efficient hydrogen generation. Nevertheless, the designed heterostructure materials exhibited significant photo- and electrocatalytic activity toward the HER, which demonstrates a method for methodically enhancing catalytic performance by creating heterostructures with the best energetic offsets.
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Affiliation(s)
- Amir Mehtab
- Nanochemistry Laboratory, Department of Chemistry, Jamia Millia Islamia, New Delhi 110025, India
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
| | - Sarbajit Banerjee
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
| | - Yuanbing Mao
- Department of Chemistry, Illinois Institute of Technology, 3105 South Dearborn Street, Chicago, Illinois 60616, United States
| | - Tokeer Ahmad
- Nanochemistry Laboratory, Department of Chemistry, Jamia Millia Islamia, New Delhi 110025, India
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5
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Rosner T, Pavlopoulos NG, Shoyhet H, Micheel M, Wächtler M, Adir N, Amirav L. The Other Dimension-Tuning Hole Extraction via Nanorod Width. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12193343. [PMID: 36234471 PMCID: PMC9565346 DOI: 10.3390/nano12193343] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 09/14/2022] [Accepted: 09/21/2022] [Indexed: 05/10/2023]
Abstract
Solar-to-hydrogen generation is a promising approach to generate clean and renewable fuel. Nanohybrid structures such as CdSe@CdS-Pt nanorods were found favorable for this task (attaining 100% photon-to-hydrogen production efficiency); yet the rods cannot support overall water splitting. The key limitation seems to be the rate of hole extraction from the semiconductor, jeopardizing both activity and stability. It is suggested that hole extraction might be improved via tuning the rod's dimensions, specifically the width of the CdS shell around the CdSe seed in which the holes reside. In this contribution, we successfully attain atomic-scale control over the width of CdSe@CdS nanorods, which enables us to verify this hypothesis and explore the intricate influence of shell diameter over hole quenching and photocatalytic activity towards H2 production. A non-monotonic effect of the rod's diameter is revealed, and the underlying mechanism for this observation is discussed, alongside implications towards the future design of nanoscale photocatalysts.
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Affiliation(s)
- Tal Rosner
- Schulich Faculty of Chemistry, The Russell Berrie Nanotechnology Institute, The Nancy and Stephen Grand Technion Energy Program, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Nicholas G. Pavlopoulos
- Schulich Faculty of Chemistry, The Russell Berrie Nanotechnology Institute, The Nancy and Stephen Grand Technion Energy Program, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Hagit Shoyhet
- Schulich Faculty of Chemistry, The Russell Berrie Nanotechnology Institute, The Nancy and Stephen Grand Technion Energy Program, Technion−Israel Institute of Technology, Haifa 32000, Israel
| | - Mathias Micheel
- Department Functional Interfaces, Leibniz Institute of Photonic Technology Jena, Albert-Einstein-Straße 9, 07745 Jena, Germany
| | - Maria Wächtler
- Department Functional Interfaces, Leibniz Institute of Photonic Technology Jena, Albert-Einstein-Straße 9, 07745 Jena, Germany
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
- Correspondence: (M.W.); (N.A.); (L.A.)
| | - Noam Adir
- Schulich Faculty of Chemistry, The Russell Berrie Nanotechnology Institute, The Nancy and Stephen Grand Technion Energy Program, Technion−Israel Institute of Technology, Haifa 32000, Israel
- Correspondence: (M.W.); (N.A.); (L.A.)
| | - Lilac Amirav
- Schulich Faculty of Chemistry, The Russell Berrie Nanotechnology Institute, The Nancy and Stephen Grand Technion Energy Program, Technion−Israel Institute of Technology, Haifa 32000, Israel
- Correspondence: (M.W.); (N.A.); (L.A.)
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6
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Li B, Tong F, Lv M, Wang Z, Liu Y, Wang P, Cheng H, Dai Y, Zheng Z, Huang B. In Situ Monitoring Charge Transfer on Topotactic Epitaxial Heterointerface for Tetracycline Degradation at the Single-Particle Level. ACS Catal 2022. [DOI: 10.1021/acscatal.2c02447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bei Li
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Fengxia Tong
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Min Lv
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Zeyan Wang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Yuanyuan Liu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Peng Wang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Hefeng Cheng
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Ying Dai
- School of Physics, Shandong University, Jinan 250100, China
| | - Zhaoke Zheng
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Baibiao Huang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
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7
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Xu L, Zhao Y, Li Z, Wu J, Cui J, Tian B, Wu Y, Tian Y. π-d Electron-Coupled PBDIT/CdS Heterostructure Enables Hole Extraction for Efficient Photocatalytic Hydrogen Production. ACS APPLIED MATERIALS & INTERFACES 2022; 14:25278-25287. [PMID: 35622948 DOI: 10.1021/acsami.2c01781] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Construction of heterostructures is one of the most promising strategies for designing photocatalysts for highly efficient solar hydrogen (H2) production because the introduction of an electron-donating counterpart contributes to more effective photon absorption, while the heterostructures benefit spatial carrier separation. However, the hole-transfer rate is usually 2-3 orders of magnitude slower than that of the electron-transfer rate within the heterostructures, ensuing serious charge recombination. Here, we find the energy band offset-driven charge-transfer behavior in a donor-acceptor (D-A)-conjugated polymer/CdS organic/inorganic heterostructure and realize hole-transfer improvement in cooperation with a further hole removal motif of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate. The photocatalytic H2 production activity is increased by nearly 2 orders of magnitude with the apparent quantum yield hitting ca. 80% at 450 nm without co-catalysts. Ultrafast transient absorption together with surface photovoltage characterizations consolidates the hole extraction mechanism. The intimate bond formed at the interface between the polymer and the inorganic semiconductor acts as an interpenetrating network at the nanoscale level, thus providing a charge-transfer freeway for boosting charge separation.
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Affiliation(s)
- Linpeng Xu
- Institute of New Carbon Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
- Institution of Energy Innovation, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Yun Zhao
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Zhanfeng Li
- Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
| | - Jianhong Wu
- Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
| | - Jiewu Cui
- Key Laboratory of Advanced Functional Materials and Devices of Anhui Province & School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
| | - Bining Tian
- Institution of Energy Innovation, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Yucheng Wu
- Institute of New Carbon Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
- Key Laboratory of Advanced Functional Materials and Devices of Anhui Province & School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
| | - Yue Tian
- Institute of New Carbon Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
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8
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Xu Y, Zhang H, Liu Q, Liu J, Chen R, Yu J, Zhu J, Li R, Wang J. Surface hybridization of π-conjugate structure cyclized polyacrylonitrile and radial microsphere shaped TiO 2 for reducing U(VI) to U(IV). JOURNAL OF HAZARDOUS MATERIALS 2021; 416:125812. [PMID: 34492780 DOI: 10.1016/j.jhazmat.2021.125812] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 03/25/2021] [Accepted: 04/01/2021] [Indexed: 06/13/2023]
Abstract
It is still a challenge to obtain uranium (U) adsorbents with high selectivity, excellent cycle stability and excellent performance through design and synthesis. In this paper, the TiO2/CPAN-AO catalyst was prepared by the hydrothermal method combined with high temperature cyclization dehydrogenation. TiO2/CPAN-AO has excellent photocatalytic properties, which can reduce U(VI) to U(IV) quickly and selectively. The generated Z-type heterojunction promotes the reduction ability of photogenerated electrons, and obtains great selectivity to UO22+ (Uranyl ions) through the AO group. TiO2/CPAN-AO with π-electron conjugated structure broadens the spectral range through surface hybridization and prolongs the lifetime of photo-generated charges. Under the induction of light, the uranium extraction capacity of TiO2/CPAN-AO after 5 h of irradiation is about 2.38 g/g. TiO2/CPAN-AO is a catalyst with enhanced adsorption capacity, making it possible to extract uranium from large-scale natural seawater in the future.
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Affiliation(s)
- Yachao Xu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; Key Laboratory of Marine Special Materials, Ministry of Industry and Information Technology, China
| | - Hongsen Zhang
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; Key Laboratory of Marine Special Materials, Ministry of Industry and Information Technology, China.
| | - Qi Liu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; HIT (Hainan) MilitaryCivilian Integration Innovation Research Institute Company Ltd., Hainan 572400, China; Harbin Engineering University Capital Management Co. Ltd, Harbin 150001, China; Key Laboratory of Marine Special Materials, Ministry of Industry and Information Technology, China
| | - Jingyuan Liu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; Key Laboratory of Marine Special Materials, Ministry of Industry and Information Technology, China
| | - Rongrong Chen
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; Key Laboratory of Marine Special Materials, Ministry of Industry and Information Technology, China
| | - Jing Yu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; Key Laboratory of Marine Special Materials, Ministry of Industry and Information Technology, China
| | - Jiahui Zhu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; Key Laboratory of Marine Special Materials, Ministry of Industry and Information Technology, China
| | - Rumin Li
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; HIT (Hainan) MilitaryCivilian Integration Innovation Research Institute Company Ltd., Hainan 572400, China; Key Laboratory of Marine Special Materials, Ministry of Industry and Information Technology, China
| | - Jun Wang
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China; HIT (Hainan) MilitaryCivilian Integration Innovation Research Institute Company Ltd., Hainan 572400, China; Key Laboratory of Marine Special Materials, Ministry of Industry and Information Technology, China.
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9
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Lei L, Huang D, Chen S, Zhang C, Chen Y, Deng R. Metal chalcogenide/oxide-based quantum dots decorated functional materials for energy-related applications: Synthesis and preservation. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213715] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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10
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Cho J, Suwandaratne NS, Razek S, Choi YH, Piper LFJ, Watson DF, Banerjee S. Elucidating the Mechanistic Origins of Photocatalytic Hydrogen Evolution Mediated by MoS 2/CdS Quantum-Dot Heterostructures. ACS APPLIED MATERIALS & INTERFACES 2020; 12:43728-43740. [PMID: 32866372 DOI: 10.1021/acsami.0c12583] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Solar fuel generation mediated by semiconductor heterostructures represents a promising strategy for sustainable energy conversion and storage. The design of semiconductor heterostructures for photocatalytic energy conversion requires the separation of photogenerated charge carriers in real space and their delivery to active catalytic sites at the appropriate overpotentials to initiate redox reactions. Operation of the desired sequence of light harvesting, charge separation, and charge transport events within heterostructures is governed by the thermodynamic energy offsets of the two components and their photoexcited charge-transfer reactivity, which determine the extent to which desirable processes can outcompete unproductive recombination channels. Here, we map energetic offsets and track the dynamics of electron transfer in MoS2/CdS architectures, prepared by interfacing two-dimensional MoS2 nanosheets with CdS quantum dots (QDs), and correlate the observed charge separation to photocatalytic activity in the hydrogen evolution reaction. The energetic offsets between MoS2 and CdS have been determined using hard and soft X-ray photoemission spectroscopy (XPS) in conjunction with density functional theory. A staggered type-II interface is observed, which facilitates electron and hole separation across the interface. Transient absorption spectroscopy measurements demonstrate ultrafast electron injection occurring within sub-5 ps from CdS QDs to MoS2, allowing for creation of a long-lived charge-separated state. The increase of electron concentration in MoS2 is evidenced with the aid of spectroelectrochemical measurements and by identifying the distinctive signatures of electron-phonon scattering in picosecond-resolution transient absorption spectra. Ultrafast charge separation across the type-II interface of MoS2/CdS heterostructures enables a high Faradaic efficiency of ∼99.4 ± 1.2% to be achieved in the hydrogen evolution reaction (HER) and provides a 40-fold increase in the photocatalytic activity of dispersed photocatalysts for H2 generation. The accurate mapping of thermodynamic driving forces and dynamics of charge transfer in these heterostructures suggests a means of engineering ultrafast electron transfer and effective charge separation to design viable photocatalytic architectures.
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Affiliation(s)
- Junsang Cho
- Departments of Chemistry and Materials Science and Engineering, Texas A&M University, College Station, Texas 77842-3012, United States
- Department of Chemistry, Duksung Women's University, Seoul 01369, South Korea
| | - Nuwanthi S Suwandaratne
- Department of Chemistry, University at Buffalo The State University of New York, Buffalo, New York 14260-3000, United States
| | - Sara Razek
- Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States
| | - Yun-Hyuk Choi
- Departments of Chemistry and Materials Science and Engineering, Texas A&M University, College Station, Texas 77842-3012, United States
- School of Advanced Materials and Chemical Engineering, Daegu Catholic University, Gyeongsan, Gyeongbuk 38430, South Korea
| | - Louis F J Piper
- Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, United States
| | - David F Watson
- Department of Chemistry, University at Buffalo The State University of New York, Buffalo, New York 14260-3000, United States
| | - Sarbajit Banerjee
- Departments of Chemistry and Materials Science and Engineering, Texas A&M University, College Station, Texas 77842-3012, United States
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11
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Sorensen JJ, Tieu E, Sevy A, Merriles DM, Nielson C, Ewigleben JC, Morse MD. Bond dissociation energies of transition metal oxides: CrO, MoO, RuO, and RhO. J Chem Phys 2020; 153:074303. [PMID: 32828096 DOI: 10.1063/5.0021052] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Through the use of resonant two-photon ionization spectroscopy, sharp predissociation thresholds have been identified in the spectra of CrO, MoO, RuO, and RhO. Similar thresholds have previously been used to measure the bond dissociation energies (BDEs) of many molecules that have a high density of vibronic states at the ground separated atom limit. A high density of states allows precise measurement of the BDE by facilitating prompt dissociation to ground state atoms when the BDE is exceeded. However, the number of states required for prompt predissociation at the thermochemical threshold is not well defined and undoubtedly varies from molecule to molecule. The ground separated atom limit generates 315 states for RuO, 252 states for RhO, and 63 states for CrO and MoO. Although comparatively few states derive from this limit for CrO and MoO, the observation of sharp predissociation thresholds for all four molecules nevertheless allows BDEs to be assigned as 4.863(3) eV (RuO), 4.121(3) eV (RhO), 4.649(5) eV (CrO), and 5.414(19) eV (MoO). Thermochemical cycles are used to derive the enthalpies of formation of the gaseous metal oxides and to obtain IE(RuO) = 8.41(5) eV, IE(RhO) = 8.56(6) eV, D0(Ru-O-) = 4.24(2) eV, D0(Cr-O-) = 4.409(8) eV, and D0(Mo-O-) = 5.243(20) eV. The mechanisms leading to prompt predissociation at threshold in the cases of CrO and MoO are discussed. Also presented is a discussion of the bonding trends for the transition metal oxides, which are compared to the previously measured transition metal sulfides.
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Affiliation(s)
- Jason J Sorensen
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA
| | - Erick Tieu
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA
| | - Andrew Sevy
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA
| | - Dakota M Merriles
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA
| | - Christopher Nielson
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA
| | - Joshua C Ewigleben
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA
| | - Michael D Morse
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA
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12
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Edwards EH, Fertig AA, McClelland KP, Meidenbauer MT, Chakraborty S, Krauss TD, Bren KL, Matson EM. Enhancing the activity of photocatalytic hydrogen evolution from CdSe quantum dots with a polyoxovanadate cluster. Chem Commun (Camb) 2020; 56:8762-8765. [PMID: 32628236 DOI: 10.1039/d0cc03163a] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
We report the improvement of photocatalytic proton reduction using molecular polyoxovanadate-alkoxide clusters as hole scavengers for CdSe quantum dots. The increased hydrogen production is explained by favorable charge interactions between reduced forms of the cluster and the charge on the quantum dots arising from the capping ligands.
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Affiliation(s)
- Emily H Edwards
- Department of Chemistry, University of Rochester, Rochester, New York 14627, USA.
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13
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Comparison of Ga2O3 and TiO2 Nanostructures for Photocatalytic Degradation of Volatile Organic Compounds. Catalysts 2020. [DOI: 10.3390/catal10050545] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The photocatalytic degradation of formaldehyde, acetaldehyde, toluene, and styrene are compared using monoclinic Ga2O3 and anatase TiO2 nanostructures under ultraviolet-C irradiation. These Ga2O3 and TiO2 photocatalysts are characterized using a field emission scanning electron microscope, a powder X-ray diffraction system, the Brunauer–Emmett–Teller method, and a Fourier transform infrared spectrometer. The Ga2O3 shows a higher reaction rate constant (k, min−1) than TiO2 by a factor of 7.1 for toluene, 8.1 for styrene, 3.1 for formaldehyde, and 2.0 for acetaldehyde. The results demonstrate that the photocatalytic activity ratio of the Ga2O3 over the TiO2 becomes more prominent toward the aromatic compounds compared with the nonaromatic compounds. Highly energetic photo-generated carriers on the conduction/valence band-edge of the Ga2O3, in comparison with that of the TiO2, result in superior photocatalytic activity, in particular on aromatic volatile organic compounds (VOCs) with a high bond dissociation energy.
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14
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Mei F, Li Z, Dai K, Zhang J, Liang C. Step-scheme porous g-C3N4/Zn0.2Cd0.8S-DETA composites for efficient and stable photocatalytic H2 production. CHINESE JOURNAL OF CATALYSIS 2020. [DOI: 10.1016/s1872-2067(19)63389-9] [Citation(s) in RCA: 176] [Impact Index Per Article: 44.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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15
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Chauhan S, Sheng A, Cho J, Razek SA, Suwandaratne N, Sfeir MY, Piper LFJ, Banerjee S, Watson DF. Type-II heterostructures of α-V2O5 nanowires interfaced with cadmium chalcogenide quantum dots: Programmable energetic offsets, ultrafast charge transfer, and photocatalytic hydrogen evolution. J Chem Phys 2019; 151:224702. [DOI: 10.1063/1.5128148] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Affiliation(s)
- Saurabh Chauhan
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA
| | - Aaron Sheng
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA
| | - Junsang Cho
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843-3255, USA
| | - Sara Abdel Razek
- Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, USA
| | - Nuwanthi Suwandaratne
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA
| | - Matthew Y. Sfeir
- Brookhaven National Laboratory, Center for Functional Nanomaterials, Upton, New York 11973, USA
| | - Louis F. J. Piper
- Department of Physics, Applied Physics and Astronomy, Binghamton University, Binghamton, New York 13902, USA
| | - Sarbajit Banerjee
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843-3255, USA
| | - David F. Watson
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, USA
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16
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Andrews JL, Santos DA, Meyyappan M, Williams RS, Banerjee S. Building Brain-Inspired Logic Circuits from Dynamically Switchable Transition-Metal Oxides. TRENDS IN CHEMISTRY 2019. [DOI: 10.1016/j.trechm.2019.07.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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17
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WWMOD? What would metal oxides do?: Redefining their applicability in today’s energy technologies. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.06.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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18
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Cho J, Sheng A, Suwandaratne N, Wangoh L, Andrews JL, Zhang P, Piper LFJ, Watson DF, Banerjee S. The Middle Road Less Taken: Electronic-Structure-Inspired Design of Hybrid Photocatalytic Platforms for Solar Fuel Generation. Acc Chem Res 2019; 52:645-655. [PMID: 30543407 DOI: 10.1021/acs.accounts.8b00378] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The development of efficient solar energy conversion to augment other renewable energy approaches is one of the grand challenges of our time. Water splitting, or the disproportionation of H2O into energy-dense fuels, H2 and O2, is undoubtedly a promising strategy. Solar water splitting involves the concerted transfer of four electrons and four protons, which requires the synergistic operation of solar light harvesting, charge separation, mass and charge transport, and redox catalysis processes. It is unlikely that individual materials can mediate the entire sequence of charge and mass transport as well as energy conversion processes necessary for photocatalytic water splitting. An alternative approach, emulating the functioning of photosynthetic systems, involves the utilization of hybrid systems wherein different components perform the various functions required for solar water splitting. The design of such hybrid systems requires the multiple components to operate in lockstep with optimal thermodynamic driving forces and interfacial charge transfer kinetics. This Account describes a new class of nanoscale heterostructures comprising M xV2O5 nanowires, where M is a p-block cation with a ( n - 1) d10 ns2 np0 electronic configuration characterized by a stereoactive lone pair of electrons and x is its stoichiometry, interfaced with II-VI semiconductor quantum dots (QDs). Photocatalytic water splitting involves the transfer of excited-state holes from QDs to mid-gap states (derived from the stereoactive lone pairs of p-block cations) of nanowires, hole transport through nanowires, the reduction of protons at a QD-immobilized catalyst, and water oxidation at an anode. The M xV2O5/QD architectures provide a vast design space for evolutionary optimization of function with considerable tunability of composition and structure of the individual components as well as of the interfacial structure, thereby facilitating programmability of absorption spectra, energetic offsets, and charge-transfer reactivity. The available design space spans choice of the p-block cation M, its stoichiometry x, the composition and size of various QDs, and the nature of the nanowire/QD interface. This multivariate parameter space has been navigated by integrating first-principles modeling, diversified synthesis, spectroscopic measurements, and catalytic evaluation to facilitate the rational design of several generations of heterostructures and the systematic improvement of their photocatalytic performance. The electronic structures of the target heterostructures are predicted by DFT calculations in light of the revised lone pair model of stereoactive structural distortions and evaluated by hard X-ray photoelectron spectroscopy such as to systematically tune the interfacial band offsets. Central to this approach is the development of a topochemical "etch-a-sketch" intercalation approach that allows for facile installation of p-block cations in metastable polymorphs of V2O5. The interfacial charge transfer kinetics of M xV2O5/QD heterostructures is further evaluated by transient absorption spectroscopy to measure excited-state charge-transfer dynamics and is found to depend sensitively on interfacial structure and the thermodynamic driving forces in accordance with Marcus theory. The integration of theory and experiment has allowed for the design of viable photocatalytic architectures exemplified by the exceptional catalytic performance of β-Pb xV2O5/CdX (X= S, Se) architectures, which has subsequently been elaborated to other lone-pair M xV2O5 compounds, demonstrating the effective exploitation of the opportunities for programmability available in the design space.
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Affiliation(s)
- Junsang Cho
- Departments of Chemistry and Materials Science and Engineering, Texas A&M University, College Station, Texas 77842-3012, United States
| | - Aaron Sheng
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
| | - Nuwanthi Suwandaratne
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
| | - Linda Wangoh
- Department of Physics, Applied Physics, and Astronomy, Binghamton University, Binghamton, New York 13902, United States
| | - Justin L. Andrews
- Departments of Chemistry and Materials Science and Engineering, Texas A&M University, College Station, Texas 77842-3012, United States
| | - Peihong Zhang
- Department of Physics, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
| | - Louis F. J. Piper
- Department of Physics, Applied Physics, and Astronomy, Binghamton University, Binghamton, New York 13902, United States
| | - David F. Watson
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000, United States
| | - Sarbajit Banerjee
- Departments of Chemistry and Materials Science and Engineering, Texas A&M University, College Station, Texas 77842-3012, United States
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