101
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Factors Controlling the Redox Activity of Oxygen in Perovskites: From Theory to Application for Catalytic Reactions. Catalysts 2017. [DOI: 10.3390/catal7050149] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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102
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Nguyen AI, Suess DLM, Darago LE, Oyala PH, Levine DS, Ziegler MS, Britt RD, Tilley TD. Manganese-Cobalt Oxido Cubanes Relevant to Manganese-Doped Water Oxidation Catalysts. J Am Chem Soc 2017; 139:5579-5587. [PMID: 28347135 DOI: 10.1021/jacs.7b01792] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Incorporation of Mn into an established water oxidation catalyst based on a Co(III)4O4 cubane was achieved by a simple and efficient assembly of permanganate, cobalt(II) acetate, and pyridine to form the cubane oxo cluster MnCo3O4(OAc)5py3 (OAc = acetate, py = pyridine) (1-OAc) in good yield. This allows characterization of electronic and chemical properties for a manganese center in a cobalt oxide environment, and provides a molecular model for Mn-doped cobalt oxides. The electronic properties of the cubane are readily tuned by exchange of the OAc- ligand for Cl- (1-Cl), NO3- (1-NO3), and pyridine ([1-py]+). EPR spectroscopy, SQUID magnetometry, and DFT calculations thoroughly characterized the valence assignment of the cubane as [MnIVCoIII3]. These cubanes are redox-active, and calculations reveal that the Co ions behave as the reservoir for electrons, but their redox potentials are tuned by the choice of ligand at Mn. This MnCo3O4 cubane system represents a new class of easily prepared, versatile, and redox-active oxido clusters that should contribute to an understanding of mixed-metal, Mn-containing oxides.
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Affiliation(s)
- Andy I Nguyen
- Department of Chemistry, University of California at Berkeley , Berkeley, California 94720-1460, United States
| | - Daniel L M Suess
- Department of Chemistry, University of California at Davis , Davis, California 95616, United States
| | - Lucy E Darago
- Department of Chemistry, University of California at Berkeley , Berkeley, California 94720-1460, United States
| | - Paul H Oyala
- Department of Chemistry, University of California at Davis , Davis, California 95616, United States
| | - Daniel S Levine
- Department of Chemistry, University of California at Berkeley , Berkeley, California 94720-1460, United States
| | - Micah S Ziegler
- Department of Chemistry, University of California at Berkeley , Berkeley, California 94720-1460, United States
| | - R David Britt
- Department of Chemistry, University of California at Davis , Davis, California 95616, United States
| | - T Don Tilley
- Department of Chemistry, University of California at Berkeley , Berkeley, California 94720-1460, United States
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103
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Crandell DW, Xu S, Smith JM, Baik MH. Intramolecular Oxyl Radical Coupling Promotes O–O Bond Formation in a Homogeneous Mononuclear Mn-based Water Oxidation Catalyst: A Computational Mechanistic Investigation. Inorg Chem 2017; 56:4436-4446. [DOI: 10.1021/acs.inorgchem.6b03144] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Douglas W. Crandell
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Song Xu
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Jeremy M. Smith
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - Mu-Hyun Baik
- Institute for Basic Science (IBS), Center for Catalytic Hydrocarbon Functionalizations, Daejeon, 34141, South Korea
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, South Korea
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104
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Pell CJ, Zhu Y, Huacuja R, Herbert DE, Hughes RP, Ozerov OV. Fluorocarbene, fluoroolefin, and fluorocarbyne complexes of Rh. Chem Sci 2017; 8:3178-3186. [PMID: 28507693 PMCID: PMC5414389 DOI: 10.1039/c6sc05391b] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2016] [Accepted: 02/16/2017] [Indexed: 12/11/2022] Open
Abstract
The manuscript reports the synthesis, characterization, and analysis of electronic structure in a series of complexes of small perfluorocarbon ligands with the (PNP)Rh fragment (where PNP is a diarylamido/bis(phosphine) pincer ligand). Reactions of (PNP)Rh(TBE) as the source of (PNP)Rh with CHF3 and C2HF5 produced perfluoroalkylidene complexes (PNP)Rh[double bond, length as m-dash]CF2 and (PNP)Rh[double bond, length as m-dash]C(F)(CF3). (PNP)Rh[double bond, length as m-dash]CF2 could also be obtained via the reaction of (PNP)Rh(TBE) with Me3SiCF3/CsF, with an admixture of (PNP)Rh(C2F4), where TBE = tert-butylethylene. Abstraction of fluoride from these neutral (PNP)RhC x F y complexes was successful, although only abstraction from (PNP)Rh[double bond, length as m-dash]CF2 allowed unambiguous identification of the Rh product, [(PNP)Rh[triple bond, length as m-dash]CF]+. DFT computational studies allowed comparison of relative energies of (PNP)Rh(C2F4) and [(PNP)Rh(C2F3)]+ isomers as well as comparisons between the electronic structure of the [double bond, length as m-dash]CF2, C2F4, and [triple bond, length as m-dash]CF+ complexes and their hydrocarbon analogues.
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Affiliation(s)
- Christopher J Pell
- Department of Chemistry , Texas A&M University , College Station , TX 77842 , USA .
| | - Yanjun Zhu
- Department of Chemistry , Texas A&M University , College Station , TX 77842 , USA .
| | - Rafael Huacuja
- Department of Chemistry , Texas A&M University , College Station , TX 77842 , USA .
| | - David E Herbert
- Department of Chemistry , Texas A&M University , College Station , TX 77842 , USA .
| | - Russell P Hughes
- Department of Chemistry , Dartmouth College , Hanover , New Hampshire 03755 , USA
| | - Oleg V Ozerov
- Department of Chemistry , Texas A&M University , College Station , TX 77842 , USA .
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105
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Synthesis and reactivity of a mononuclear non-haem cobalt(IV)-oxo complex. Nat Commun 2017; 8:14839. [PMID: 28337985 PMCID: PMC5376677 DOI: 10.1038/ncomms14839] [Citation(s) in RCA: 121] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 02/03/2017] [Indexed: 12/21/2022] Open
Abstract
Terminal cobalt(IV)-oxo (CoIV-O) species have been implicated as key intermediates in various cobalt-mediated oxidation reactions. Herein we report the photocatalytic generation of a mononuclear non-haem [(13-TMC)CoIV(O)]2+ (2) by irradiating [CoII(13-TMC)(CF3SO3)]+ (1) in the presence of [RuII(bpy)3]2+, Na2S2O8, and water as an oxygen source. The intermediate 2 was also obtained by reacting 1 with an artificial oxidant (that is, iodosylbenzene) and characterized by various spectroscopic techniques. In particular, the resonance Raman spectrum of 2 reveals a diatomic Co-O vibration band at 770 cm-1, which provides the conclusive evidence for the presence of a terminal Co-O bond. In reactivity studies, 2 was shown to be a competent oxidant in an intermetal oxygen atom transfer, C-H bond activation and olefin epoxidation reactions. The present results lend strong credence to the intermediacy of CoIV-O species in cobalt-catalysed oxidation of organic substrates as well as in the catalytic oxidation of water that evolves molecular oxygen.
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106
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Lu X, Ovchinnikov V, Demapan D, Roston D, Cui Q. Regulation and Plasticity of Catalysis in Enzymes: Insights from Analysis of Mechanochemical Coupling in Myosin. Biochemistry 2017; 56:1482-1497. [PMID: 28225609 DOI: 10.1021/acs.biochem.7b00016] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The mechanism of ATP hydrolysis in the myosin motor domain is analyzed using a combination of DFTB3/CHARMM simulations and enhanced sampling techniques. The motor domain is modeled in the pre-powerstroke state, in the post-rigor state, and as a hybrid based on the post-rigor state with a closed nucleotide-binding pocket. The ATP hydrolysis activity is found to depend on the positioning of nearby water molecules, and a network of polar residues facilitates proton transfer and charge redistribution during hydrolysis. Comparison of the observed hydrolysis pathways and the corresponding free energy profiles leads to detailed models for the mechanism of ATP hydrolysis in the pre-powerstroke state and proposes factors that regulate the hydrolysis activity in different conformational states. In the pre-powerstroke state, the scissile Pγ-O3β bond breaks early in the reaction. Proton transfer from the lytic water to the γ-phosphate through active site residues is an important part of the kinetic bottleneck; several hydrolysis pathways that feature distinct proton transfer routes are found to have similar free energy barriers, suggesting a significant degree of plasticity in the hydrolysis mechanism. Comparison of hydrolysis in the pre-powerstroke state and the closed post-rigor model suggests that optimization of residues beyond the active site for electrostatic stabilization and preorganization is likely important to enzyme design.
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Affiliation(s)
- Xiya Lu
- Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Victor Ovchinnikov
- Department of Chemistry and Chemical Biology, Harvard University , 12 Oxford Street, Boston, Massachusetts 02138, United States
| | - Darren Demapan
- Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Daniel Roston
- Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Qiang Cui
- Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States
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107
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Mechanism of Water Oxidation Catalyzed by a Dinuclear Ruthenium Complex Bridged by Anthraquinone. Catalysts 2017. [DOI: 10.3390/catal7020056] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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108
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Activating lattice oxygen redox reactions in metal oxides to catalyse oxygen evolution. Nat Chem 2017; 9:457-465. [DOI: 10.1038/nchem.2695] [Citation(s) in RCA: 959] [Impact Index Per Article: 137.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 11/14/2016] [Indexed: 12/23/2022]
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109
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Dhiman R, Singh N, Ugale B, Nagaraja CM. Synthesis, crystal structure and water oxidation activity of [Ru(terpy)(bipy)Cl]+ complexes: influence of ancillary ligands on O2 generation. RSC Adv 2017. [DOI: 10.1039/c7ra07186h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Synthesis of four new complexes [RuII(MeMPTP)(bpy)Cl]PF6 (1), [RuII(MeMPTP)(dmbpy)Cl]PF6 (2), [RuII(MeMPTP)(dmdcbpy)Cl]PF6 (3) and [RuII(MeMPTP)(Pic)2Cl]PF6 (4) and their catalytic activity for chemical oxidation of water into O2 generation has been demonstrated.
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Affiliation(s)
- Rekha Dhiman
- Department of Chemistry
- Indian Institute of Technology Ropar
- Rupnagar 140001
- India
| | - Namita Singh
- Department of Chemistry
- Indian Institute of Technology Ropar
- Rupnagar 140001
- India
| | - Bharat Ugale
- Department of Chemistry
- Indian Institute of Technology Ropar
- Rupnagar 140001
- India
| | - C. M. Nagaraja
- Department of Chemistry
- Indian Institute of Technology Ropar
- Rupnagar 140001
- India
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110
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Shaffer DW, Xie Y, Concepcion JJ. O–O bond formation in ruthenium-catalyzed water oxidation: single-site nucleophilic attack vs. O–O radical coupling. Chem Soc Rev 2017; 46:6170-6193. [DOI: 10.1039/c7cs00542c] [Citation(s) in RCA: 159] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A review of water oxidation by ruthenium-based molecular catalysts, with emphasis on the mechanism of O–O bond formation.
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Affiliation(s)
| | - Yan Xie
- Chemistry Division
- Brookhaven National Laboratory
- Upton
- USA
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111
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Recent Advances in the BiVO4 Photocatalyst for Sun-Driven Water Oxidation: Top-Performing Photoanodes and Scale-Up Challenges. Catalysts 2017. [DOI: 10.3390/catal7010013] [Citation(s) in RCA: 167] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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112
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Ji X, Cui L, Liu D, Hao S, Liu J, Qu F, Ma Y, Du G, Asiri AM, Sun X. A nickel-borate nanoarray: a highly active 3D oxygen-evolving catalyst electrode operating in near-neutral water. Chem Commun (Camb) 2017; 53:3070-3073. [DOI: 10.1039/c6cc09893b] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A nickel-borate nanoarray on carbon cloth (Ni-Bi/CC) derived from NiO/CC shows high activity and durability for water oxidation electrocatalysis in a borate electrolyte (pH 9.2), offering a current density of 10 mA cm−2 at an overpotential of 470 mV.
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Affiliation(s)
- Xuqiang Ji
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
- College of Materials
| | - Liang Cui
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
- College of Materials
| | - Danni Liu
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
| | - Shuai Hao
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
| | - Jingquan Liu
- College of Materials
- Qingdao University
- Qingdao 266071
- China
| | - Fengli Qu
- College of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165
- China
| | - Yongjun Ma
- Analytical and Test Center
- Southwest University of Science and Technology
- Mianyang 621010
- China
| | - Gu Du
- Chengdu Institute of Geology and Mineral Resources
- Chengdu 610064
- China
| | - Abdullah M. Asiri
- College of Chemical and Environ Department
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
| | - Xuping Sun
- College of Chemistry
- Sichuan University
- Chengdu 610064
- China
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113
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Sweet LE, Corbey JF, Gendron F, Autschbach J, McNamara BK, Ziegelgruber KL, Arrigo LM, Peper SM, Schwantes JM. Structure and Bonding Investigation of Plutonium Peroxocarbonate Complexes Using Cerium Surrogates and Electronic Structure Modeling. Inorg Chem 2016; 56:791-801. [DOI: 10.1021/acs.inorgchem.6b02235] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Frédéric Gendron
- Department
of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, United States
| | - Jochen Autschbach
- Department
of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, United States
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114
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Wang Y, Zhu D, Xu X. Zr-Doped Mesoporous Ta 3N 5 Microspheres for Efficient Photocatalytic Water Oxidation. ACS APPLIED MATERIALS & INTERFACES 2016; 8:35407-35418. [PMID: 27983780 DOI: 10.1021/acsami.6b14230] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Tantalum nitride (Ta3N5) has been considered as a promising candidate for photocatalytic water splitting because of its strong visible-light absorbance as far as 600 nm. However, its catalytic activity is often hampered by various intrinsic/extrinsic defects. Here, we prepared a series of Zr-doped mesoporous tantalum nitride (Ta3N5) via a template-free method and carried out a detailed investigation of the role of Zr doping upon the photocatalytic performance. Various physicochemical properties including crystal structure, optical absorption, and so on were systematically explored. Our results show that doping Zr into Ta3N5 induces an enhancement of oxygen content and a suppression of absorption band around 720 nm, indicating an increase of ON• defects and a decrease of VN••• defects in the structure. Introduction of Zr significantly boosts the photocatalytic oxygen production of Ta3N5. The optimized photocatalytic oxygen production rate approaches 105 μmol h-1 under visible light illumination (λ ≥ 420 nm), corresponding to an apparent quantum efficiency as high as 3.2%. Photoelectrochemical analysis and DFT calculation reveal that the superior photocatalytic activity of Zr-doped Ta3N5 originates from a high level of ON• defects' concentration, which contributes to a high electron mobility, and a low level of VN••• defects' concentration, which often act as charge recombination centers.
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Affiliation(s)
- Yawei Wang
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University , 1239 Siping Road, Shanghai 200092, China
| | - Dazhang Zhu
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University , 1239 Siping Road, Shanghai 200092, China
| | - Xiaoxiang Xu
- Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University , 1239 Siping Road, Shanghai 200092, China
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115
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Zhang Q, Bell-Taylor A, Bronston FM, Gorden JD, Goldsmith CR. Aldehyde Deformylation and Catalytic C–H Activation Resulting from a Shared Cobalt(II) Precursor. Inorg Chem 2016; 56:773-782. [DOI: 10.1021/acs.inorgchem.6b02127] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qiao Zhang
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
| | - Angela Bell-Taylor
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
| | - Fraser M. Bronston
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
| | - John D. Gorden
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
| | - Christian R. Goldsmith
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
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116
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Patel J, Majee K, Ahmad E, Das B, Padhi SK. Effect of Pyridyl Substitution on Chemical and Photochemical Water Oxidation by [Ru(terpyridine)(bipyridine)(OH
2
)]
2+
Scaffolds. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201601193] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jully Patel
- Artificial Photosynthesis Lab Department of Applied Chemistry Indian Institute of Technology (ISM) 826004 Dhanbad India
| | - Karunamay Majee
- Artificial Photosynthesis Lab Department of Applied Chemistry Indian Institute of Technology (ISM) 826004 Dhanbad India
| | - Ejaz Ahmad
- Artificial Photosynthesis Lab Department of Applied Chemistry Indian Institute of Technology (ISM) 826004 Dhanbad India
| | - Babulal Das
- Department of Chemistry IIT Guwahati 781039 Assam India
| | - Sumanta Kumar Padhi
- Artificial Photosynthesis Lab Department of Applied Chemistry Indian Institute of Technology (ISM) 826004 Dhanbad India
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117
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Matias TA, Mangoni AP, Toma SH, Rein FN, Rocha RC, Toma HE, Araki K. Catalytic Water-Oxidation Activity of a Weakly Coupled Binuclear Ruthenium Polypyridyl Complex. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600889] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Tiago A. Matias
- Department of Chemistry; Institute of Chemistry; University of São Paulo; Av. Lineu Prestes 748 SP 05508-000 Butantã São Paulo Brazil
| | - Ana P. Mangoni
- Department of Chemistry; Institute of Chemistry; University of São Paulo; Av. Lineu Prestes 748 SP 05508-000 Butantã São Paulo Brazil
| | - Sergio H. Toma
- Department of Chemistry; Institute of Chemistry; University of São Paulo; Av. Lineu Prestes 748 SP 05508-000 Butantã São Paulo Brazil
| | | | | | - Henrique E. Toma
- Department of Chemistry; Institute of Chemistry; University of São Paulo; Av. Lineu Prestes 748 SP 05508-000 Butantã São Paulo Brazil
| | - Koiti Araki
- Department of Chemistry; Institute of Chemistry; University of São Paulo; Av. Lineu Prestes 748 SP 05508-000 Butantã São Paulo Brazil
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118
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Fan T, Zhan S, Ahlquist MSG. Why Is There a Barrier in the Coupling of Two Radicals in the Water Oxidation Reaction? ACS Catal 2016. [DOI: 10.1021/acscatal.6b02697] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Ting Fan
- Division of Theoretical Chemistry & Biology, School of Biotechnology, KTH Royal Institute of Technology, 10691Stockholm, Sweden
| | - Shaoqi Zhan
- Division of Theoretical Chemistry & Biology, School of Biotechnology, KTH Royal Institute of Technology, 10691Stockholm, Sweden
| | - Mårten S. G. Ahlquist
- Division of Theoretical Chemistry & Biology, School of Biotechnology, KTH Royal Institute of Technology, 10691Stockholm, Sweden
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119
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Lohrey TD, Bergman RG, Arnold J. Oxygen Atom Transfer and Intramolecular Nitrene Transfer in a Rhenium β-Diketiminate Complex. Inorg Chem 2016; 55:11993-12000. [DOI: 10.1021/acs.inorgchem.6b02122] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Trevor D. Lohrey
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - Robert G. Bergman
- Department of Chemistry, University of California, Berkeley, California 94720, United States
| | - John Arnold
- Department of Chemistry, University of California, Berkeley, California 94720, United States
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120
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Abstract
Water oxidation is a key chemical transformation for the conversion of solar energy into chemical fuels. Our review focuses on recent work on robust earth-abundant heterogeneous catalysts for the oxygen-evolving reaction (OER). We point out that improvements in the performance of OER catalysts will depend critically on the success of work aimed at understanding reaction barriers based on atomic-level mechanisms. We highlight the challenge of obtaining acid-stable OER catalysts, with proposals for elements that could be employed to reach this goal. We suggest that future advances in solar fuels science will be accelerated by the development of new methods for materials synthesis and characterization, along with in-depth investigations of redox mechanisms at catalytic surfaces.
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Affiliation(s)
- Bryan M Hunter
- Beckman Institute and Division of Chemistry and Chemical Engineering, California Institute of Technology , M/C 139-74, Pasadena, California 91125, United States
| | - Harry B Gray
- Beckman Institute and Division of Chemistry and Chemical Engineering, California Institute of Technology , M/C 139-74, Pasadena, California 91125, United States
| | - Astrid M Müller
- Beckman Institute and Division of Chemistry and Chemical Engineering, California Institute of Technology , M/C 139-74, Pasadena, California 91125, United States
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121
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Stich TA, Gagnon DM, Anderson BL, Nocera DG, Britt RD. EPR Spectroscopic Characterization of a Jahn‐Teller Distorted (
C
3
v
→
C
s
) Four‐Coordinate Chromium(V) Oxo Species. Isr J Chem 2016. [DOI: 10.1002/ijch.201600036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Troy A. Stich
- Department of Chemistry University of California One Shields Avenue Davis CA 95616 USA
| | - Derek M. Gagnon
- Department of Chemistry University of California One Shields Avenue Davis CA 95616 USA
| | - Bryce L. Anderson
- Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge MA 02138 USA
| | - Daniel G. Nocera
- Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street Cambridge MA 02138 USA
| | - R. David Britt
- Department of Chemistry University of California One Shields Avenue Davis CA 95616 USA
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122
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Tong L, Thummel RP. Mononuclear ruthenium polypyridine complexes that catalyze water oxidation. Chem Sci 2016; 7:6591-6603. [PMID: 28567250 PMCID: PMC5450527 DOI: 10.1039/c6sc02766k] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 08/05/2016] [Indexed: 12/23/2022] Open
Abstract
Over the past decade, significant advances have been made in the development of molecular water oxidation catalysts (WOCs) in the context of developing a system that would accomplish artificial photosynthesis. Mononuclear ruthenium complexes with polypyridine ligands have drawn considerable attention in this regard, due to their high catalytic activity and relatively simple structure. In this perspective review, we will discuss mononuclear Ru polypyridine WOCs by organizing them into four groups according to their ligand environments. Each group will be discussed with regard to three fundamental questions: first, how does the catalyst initiate O-O bond formation? Second, which step in the catalytic cycle is rate-determining? Third, how efficient is the catalyst according to the specific descriptors such as turnover frequency? All discussion is based on the high-valent ruthenium intermediates that are proposed in the catalytic cycle according to experimental observation and theoretical simulation. Two fundamental mechanisms are set forth. An acid-base mechanism that involves the attack of a water molecule on the oxo of a high valent Ru 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 1111111111111111111111111111111111 1111111111111111111111111111111111 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 1111111111111111111111111111111111 1111111111111111111111111111111111 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 0000000000000000000000000000000000 O species to form the O-O bond. Subsequent steps lead to dissociation of O2 and rehydration of the metal center. A second mechanism involves the formation of a Ru-O˙ radical species, two of which then couple to form a Ru-O-O-Ru species that can release O2 afterwards. The acid-base mechanism appears to be more common and mechanistic differences could result from variation directly related to polypyridine ligand structures. Understanding how electronic, steric, and conformational properties can effect catalyst performance will lead to the rational design of more effective WOCs with not only ruthenium but also other transition metals.
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Affiliation(s)
- Lianpeng Tong
- Department of Chemistry , University of Houston , 112 Fleming Building , Houston , Texas 77204-5003 , USA . ;
| | - Randolph P Thummel
- Department of Chemistry , University of Houston , 112 Fleming Building , Houston , Texas 77204-5003 , USA . ;
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Engelmann X, Monte-Pérez I, Ray K. Oxidationsreaktionen mit bioinspirierten einkernigen Nicht-Häm-Oxidometallkomplexen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600507] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xenia Engelmann
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
| | - Inés Monte-Pérez
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
| | - Kallol Ray
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
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124
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Engelmann X, Monte-Pérez I, Ray K. Oxidation Reactions with Bioinspired Mononuclear Non-Heme Metal-Oxo Complexes. Angew Chem Int Ed Engl 2016; 55:7632-49. [DOI: 10.1002/anie.201600507] [Citation(s) in RCA: 207] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Revised: 03/15/2016] [Indexed: 12/22/2022]
Affiliation(s)
- Xenia Engelmann
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Strasse 2 12489 Berlin Germany
| | - Inés Monte-Pérez
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Strasse 2 12489 Berlin Germany
| | - Kallol Ray
- Department of Chemistry; Humboldt-Universität zu Berlin; Brook-Taylor-Strasse 2 12489 Berlin Germany
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Jung J, Neu HM, Leeladee P, Siegler MA, Ohkubo K, Goldberg DP, Fukuzumi S. Photocatalytic Oxygenation of Substrates by Dioxygen with Protonated Manganese(III) Corrolazine. Inorg Chem 2016; 55:3218-28. [PMID: 26974004 PMCID: PMC4893963 DOI: 10.1021/acs.inorgchem.5b02019] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
UV-vis spectral titrations of a manganese(III) corrolazine complex [Mn(III)(TBP8Cz)] with HOTf in benzonitrile (PhCN) indicate mono- and diprotonation of Mn(III)(TBP8Cz) to give Mn(III)(OTf)(TBP8Cz(H)) and [Mn(III)(OTf)(H2O)(TBP8Cz(H)2)][OTf] with protonation constants of 9.0 × 10(6) and 4.7 × 10(3) M(-1), respectively. The protonated sites of Mn(III)(OTf)(TBP8Cz(H)) and [Mn(III)(OTf)(H2O)(TBP8Cz(H)2)][OTf] were identified by X-ray crystal structures of the mono- and diprotonated complexes. In the presence of HOTf, the monoprotonated manganese(III) corrolazine complex [Mn(III)(OTf)(TBP8Cz(H))] acts as an efficient photocatalytic catalyst for the oxidation of hexamethylbenzene and thioanisole by O2 to the corresponding alcohol and sulfoxide with 563 and 902 TON, respectively. Femtosecond laser flash photolysis measurements of Mn(III)(OTf)(TBP8Cz(H)) and [Mn(III)(OTf)(H2O)(TBP8Cz(H)2)][OTf] in the presence of O2 revealed the formation of a tripquintet excited state, which was rapidly converted to a tripseptet excited state. The tripseptet excited state of Mn(III)(OTf)(TBP8Cz(H)) reacted with O2 with a diffusion-limited rate constant to produce the putative Mn(IV)(O2(•-))(OTf)(TBP8Cz(H)), whereas the tripseptet excited state of [Mn(III)(OTf)(H2O)(TBP8Cz(H)2)][OTf] exhibited no reactivity toward O2. In the presence of HOTf, Mn(V)(O)(TBP8Cz) can oxidize not only HMB but also mesitylene to the corresponding alcohols, accompanied by regeneration of Mn(III)(OTf)(TBP8Cz(H)). This thermal reaction was examined for a kinetic isotope effect, and essentially no KIE (1.1) was observed for the oxidation of mesitylene-d12, suggesting a proton-coupled electron transfer (PCET) mechanism is operative in this case. Thus, the monoprotonated manganese(III) corrolazine complex, Mn(III)(OTf)(TBP8Cz(H)), acts as an efficient photocatalyst for the oxidation of HMB by O2 to the alcohol.
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Affiliation(s)
- Jieun Jung
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Heather M. Neu
- Department of Chemistry, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Pannee Leeladee
- Department of Chemistry, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Maxime A. Siegler
- Department of Chemistry, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Kei Ohkubo
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA and SENTAN, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
| | - David P. Goldberg
- Department of Chemistry, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
| | - Shunichi Fukuzumi
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA and SENTAN, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
- Faculty of Science and Engineering, Meijo University, ALCA and SEN TAN, Japan Science and Technology Agency (JST), Nagoya, Aichi 468-0073, Japan
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127
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Vignesh A, Prabu M, Shanmugam S. Porous LaCo1-xNixO3-δ Nanostructures as an Efficient Electrocatalyst for Water Oxidation and for a Zinc-Air Battery. ACS APPLIED MATERIALS & INTERFACES 2016; 8:6019-31. [PMID: 26887571 DOI: 10.1021/acsami.5b11840] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Perovskites have emerged as promising earth-abundant alternatives to precious metals for catalyzing the oxygen evolution reaction (OER). Herein, we report the synthesis of a series of porous perovskite nanostructures, LaCo0.97O3-δ, with systematic Ni substitution in Co octahedral sites. Their electrocatalytic activity during the water oxidation reaction was studied in alkaline electrolytes. The electrocatalytic OER activity and stability of the perovskite nanostructure was evaluated using the rotating disk electrode technique. We show that the progressive replacement of Co by Ni in the LaCo0.97O3-δ perovskite structure greatly altered the electrocatalytic activity and that the La(Co0.71Ni0.25)0.96O3-δ composition exhibited the lowest OER overpotential of 324 and 265 mV at 10 mA cm(-2) in 0.1 M KOH and 1 M KOH, respectively. This value was much lower than that of the noble metal catalysts, IrO2, Ru/C, and Pt/C. Furthermore, the La(Co0.71Ni0.25)0.96O3-δ nanostructure showed outstanding electrode stability, with no observable decrease in performance up to 114th cycle in the auxiliary linear sweep voltammetry that lasted for 10 h in chronoamperometry studies. The excellent oxygen evolution activity of the La(Co0.71Ni0.25)0.96O3-δ perovskite nanostructure can be attributed to its intrinsic structure, interconnected particle arrangement, and unique redox characteristics. The enhanced intrinsic electrocatalytic activity of the La(Co0.71Ni0.25)0.96O3-δ catalyst was correlated with several parameters, such as the electrochemical surface area, the roughness factor, and the turnover frequency, with respect to variation in the transition metals of the perovskite structure. Subsequently, La(Co0.71Ni0.25)0.96O3-δ was utilized as the air cathode in a zinc-air battery application.
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Affiliation(s)
- Ahilan Vignesh
- Department of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST) , 50-1 Sang-Ri, Hyeongpung-Myeon, Dalseong-gun, Daegu 42988, Republic of Korea
| | - Moni Prabu
- Department of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST) , 50-1 Sang-Ri, Hyeongpung-Myeon, Dalseong-gun, Daegu 42988, Republic of Korea
| | - Sangaraju Shanmugam
- Department of Energy Systems Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST) , 50-1 Sang-Ri, Hyeongpung-Myeon, Dalseong-gun, Daegu 42988, Republic of Korea
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128
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Liao M, Zeng G, Luo T, Jin Z, Wang Y, Kou X, Xiao D. Three-dimensional coral-like cobalt selenide as an advanced electrocatalyst for highly efficient oxygen evolution reaction. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.02.046] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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129
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Najafpour MM, Renger G, Hołyńska M, Moghaddam AN, Aro EM, Carpentier R, Nishihara H, Eaton-Rye JJ, Shen JR, Allakhverdiev SI. Manganese Compounds as Water-Oxidizing Catalysts: From the Natural Water-Oxidizing Complex to Nanosized Manganese Oxide Structures. Chem Rev 2016; 116:2886-936. [PMID: 26812090 DOI: 10.1021/acs.chemrev.5b00340] [Citation(s) in RCA: 337] [Impact Index Per Article: 42.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
All cyanobacteria, algae, and plants use a similar water-oxidizing catalyst for water oxidation. This catalyst is housed in Photosystem II, a membrane-protein complex that functions as a light-driven water oxidase in oxygenic photosynthesis. Water oxidation is also an important reaction in artificial photosynthesis because it has the potential to provide cheap electrons from water for hydrogen production or for the reduction of carbon dioxide on an industrial scale. The water-oxidizing complex of Photosystem II is a Mn-Ca cluster that oxidizes water with a low overpotential and high turnover frequency number of up to 25-90 molecules of O2 released per second. In this Review, we discuss the atomic structure of the Mn-Ca cluster of the Photosystem II water-oxidizing complex from the viewpoint that the underlying mechanism can be informative when designing artificial water-oxidizing catalysts. This is followed by consideration of functional Mn-based model complexes for water oxidation and the issue of Mn complexes decomposing to Mn oxide. We then provide a detailed assessment of the chemistry of Mn oxides by considering how their bulk and nanoscale properties contribute to their effectiveness as water-oxidizing catalysts.
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Affiliation(s)
| | - Gernot Renger
- Institute of Chemistry, Max-Volmer-Laboratory of Biophysical Chemistry, Technical University Berlin , Straße des 17. Juni 135, D-10623 Berlin, Germany
| | - Małgorzata Hołyńska
- Fachbereich Chemie und Wissenschaftliches Zentrum für Materialwissenschaften (WZMW), Philipps-Universität Marburg , Hans-Meerwein-Straße, D-35032 Marburg, Germany
| | | | - Eva-Mari Aro
- Department of Biochemistry and Food Chemistry, University of Turku , 20014 Turku, Finland
| | - Robert Carpentier
- Groupe de Recherche en Biologie Végétale (GRBV), Université du Québec à Trois-Rivières , C.P. 500, Trois-Rivières, Québec G9A 5H7, Canada
| | - Hiroshi Nishihara
- Department of Chemistry, School of Science, The University of Tokyo , 7-3-1, Hongo, Bunkyo-Ku, Tokyo 113-0033, Japan
| | - Julian J Eaton-Rye
- Department of Biochemistry, University of Otago , P.O. Box 56, Dunedin 9054, New Zealand
| | - Jian-Ren Shen
- Photosynthesis Research Center, Graduate School of Natural Science and Technology, Faculty of Science, Okayama University , Okayama 700-8530, Japan.,Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences , Beijing 100093, China
| | - Suleyman I Allakhverdiev
- Controlled Photobiosynthesis Laboratory, Institute of Plant Physiology, Russian Academy of Sciences , Botanicheskaya Street 35, Moscow 127276, Russia.,Institute of Basic Biological Problems, Russian Academy of Sciences , Pushchino, Moscow Region 142290, Russia.,Department of Plant Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University , Leninskie Gory 1-12, Moscow 119991, Russia
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130
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Ishizuka T, Watanabe A, Kotani H, Hong D, Satonaka K, Wada T, Shiota Y, Yoshizawa K, Ohara K, Yamaguchi K, Kato S, Fukuzumi S, Kojima T. Homogeneous Photocatalytic Water Oxidation with a Dinuclear CoIII–Pyridylmethylamine Complex. Inorg Chem 2016; 55:1154-64. [DOI: 10.1021/acs.inorgchem.5b02336] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tomoya Ishizuka
- Department of Chemistry, Graduate School
of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Atsuko Watanabe
- Department of Chemistry, Graduate School
of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Hiroaki Kotani
- Department of Chemistry, Graduate School
of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Dachao Hong
- Department of Chemistry, Graduate School
of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Kenta Satonaka
- Department of Chemistry, Graduate School
of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
| | - Tohru Wada
- Department of Chemistry,
College of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
| | - Yoshihito Shiota
- Institute for Materials
Chemistry and Engineering, Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kazunari Yoshizawa
- Institute for Materials
Chemistry and Engineering, Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- Elements Strategy Initiative for Catalysts & Batteries, Kyoto University, Nishi-ku, Kyoto 615-8520, Japan
| | - Kazuaki Ohara
- Faculty
of Pharmaceutical Science at Kagawa Campus, Tokushima Bunri University, 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan
| | - Kentaro Yamaguchi
- Faculty
of Pharmaceutical Science at Kagawa Campus, Tokushima Bunri University, 1314-1 Shido, Sanuki, Kagawa 769-2193, Japan
| | - Satoshi Kato
- Department
of Material and Life Science, Graduate School of Engineering, Osaka University, and ALCA, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan
| | - Shunichi Fukuzumi
- Department
of Material and Life Science, Graduate School of Engineering, Osaka University, and ALCA, Japan Science and Technology Agency, Suita, Osaka 565-0871, Japan
- Faculty of Science and Technology, Meijo University, ALCA and SENTAN, Japan Science and Technology Agency (JST), Tempaku, Nagoya, Aichi 468-8502, Japan
- Department
of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Takahiko Kojima
- Department of Chemistry, Graduate School
of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8571, Japan
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131
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Zhang Y, Shi J, Hu Y, Huang Z, Guo L. Co3(OH)2(HPO4)2 as a novel photocatalyst for O2 evolution under visible-light irradiation. Catal Sci Technol 2016. [DOI: 10.1039/c6cy01861k] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Co3(OH)2(HPO4)2 was proved to be a novel visible-light-driven photocatalyst for O2 evolution due to the unique characteristics of Co2+ octahedra.
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Affiliation(s)
- Yazhou Zhang
- International Research Center for Renewable Energy (IRCRE)
- State Key Laboratory of Multiphase Flow in Power Engineering (MFPE)
- Xi'an Jiaotong University (XJTU)
- Xi'an 710049
- China
| | - Jinwen Shi
- International Research Center for Renewable Energy (IRCRE)
- State Key Laboratory of Multiphase Flow in Power Engineering (MFPE)
- Xi'an Jiaotong University (XJTU)
- Xi'an 710049
- China
| | - Yuchao Hu
- International Research Center for Renewable Energy (IRCRE)
- State Key Laboratory of Multiphase Flow in Power Engineering (MFPE)
- Xi'an Jiaotong University (XJTU)
- Xi'an 710049
- China
| | - Zhenxiong Huang
- International Research Center for Renewable Energy (IRCRE)
- State Key Laboratory of Multiphase Flow in Power Engineering (MFPE)
- Xi'an Jiaotong University (XJTU)
- Xi'an 710049
- China
| | - Liejin Guo
- International Research Center for Renewable Energy (IRCRE)
- State Key Laboratory of Multiphase Flow in Power Engineering (MFPE)
- Xi'an Jiaotong University (XJTU)
- Xi'an 710049
- China
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132
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133
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Mondragón A, Martínez-Alanis PR, Aullón G, Hernández-Ortega S, Robles-Marín E, Flores-Alamo M, Ugalde-Saldívar VM, Castillo I. Redox flexibility of iron complexes supported by sulfur-based tris(o-methylenethiophenolato)amine relative to its tripodal oxygen-based congener. Dalton Trans 2016; 45:9996-10006. [DOI: 10.1039/c6dt00814c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Tripodal ligands designed to generate a local C3 symmetry have resulted in novel types of metal complexes that feature unusual bonding and electronic properties.
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Affiliation(s)
| | - Paulina R. Martínez-Alanis
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Gabriel Aullón
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | | | - Elvis Robles-Marín
- Instituto de Química
- Universidad Nacional Autónoma de México
- México DF
- México
| | - Marcos Flores-Alamo
- Facultad de Química
- División de Estudios de Posgrado
- Universidad Nacional Autónoma de México
- México DF
- México
| | - Víctor M. Ugalde-Saldívar
- Facultad de Química
- División de Estudios de Posgrado
- Universidad Nacional Autónoma de México
- México DF
- México
| | - Ivan Castillo
- Instituto de Química
- Universidad Nacional Autónoma de México
- México DF
- México
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134
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Altmann PJ, Pöthig A. Capsoplexes: encapsulating complexes via guest recognition. Chem Commun (Camb) 2016; 52:9089-92. [DOI: 10.1039/c6cc00507a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A new dinuclear Ni–NHC complex is able to selectively recognise and self-assemble with guests via tennis-ball like encapsulation, exemplarily demonstrated employing halides.
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Affiliation(s)
- Philipp J. Altmann
- Catalysis Research Center & Department of Chemistry
- Technische Universität München
- 85747 Garching bei München
- Germany
| | - Alexander Pöthig
- Catalysis Research Center & Department of Chemistry
- Technische Universität München
- 85747 Garching bei München
- Germany
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135
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Ure AD, Lázaro IA, Cotter M, McDonald AR. Synthesis and characterisation of a mesocyclic tripodal triamine ligand. Org Biomol Chem 2016; 14:483-494. [DOI: 10.1039/c5ob01556a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The preparation and characterisation of mesocyclic polydentate amine ligands is described. The novel tridentate ligands will be employed in the stabilisation of highly reactive high-valent oxidants.
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Affiliation(s)
- Andrew D. Ure
- School of Chemistry and CRANN/AMBER Nanoscience Institute
- Trinity College Dublin
- The University of Dublin
- College Green
- Dublin 2
| | - Isabel Abánades Lázaro
- School of Chemistry and CRANN/AMBER Nanoscience Institute
- Trinity College Dublin
- The University of Dublin
- College Green
- Dublin 2
| | - Michelle Cotter
- School of Chemistry and CRANN/AMBER Nanoscience Institute
- Trinity College Dublin
- The University of Dublin
- College Green
- Dublin 2
| | - Aidan R. McDonald
- School of Chemistry and CRANN/AMBER Nanoscience Institute
- Trinity College Dublin
- The University of Dublin
- College Green
- Dublin 2
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136
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Ishizuka T, Kotani H, Kojima T. Characteristics and reactivity of ruthenium–oxo complexes. Dalton Trans 2016; 45:16727-16750. [DOI: 10.1039/c6dt03024f] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this perspective, we have surveyed the synthetic procedure, characteristics, and reactivity of high-valent ruthenium–oxo complexes.
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Affiliation(s)
| | - Hiroaki Kotani
- Department of Chemistry
- University of Tsukuba
- Tsukuba
- Japan
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137
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Wu F, Lv M, Sun X, Xie Y, Chen H, Ni S, Liu G, Xu X. Efficient Photocatalytic Oxygen Production over Nitrogen-Doped Sr4
Nb2
O9
under Visible-Light Irradiation. ChemCatChem 2015. [DOI: 10.1002/cctc.201501035] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Fangfang Wu
- Department of Chemistry; Tongji University; 1239 Siping Road Shanghai 200092 P.R China
| | - Meilin Lv
- Department of Chemistry; Tongji University; 1239 Siping Road Shanghai 200092 P.R China
| | - Xiaoqin Sun
- Department of Chemistry; Tongji University; 1239 Siping Road Shanghai 200092 P.R China
| | - Yinghao Xie
- Department of Chemistry; Tongji University; 1239 Siping Road Shanghai 200092 P.R China
| | - Hongmei Chen
- Department of Chemistry; Tongji University; 1239 Siping Road Shanghai 200092 P.R China
| | - Shuang Ni
- Science and Technology on Plasma Physics Laboratory, Laser Fusion Research Center; China Academy of Engineering Physics; Mianyang 621900 P.R China
| | - Gang Liu
- Institute of Metal Research; Chinese Academy of Science; 72 Wenhua Road Shenyang 110016 P.R China
| | - Xiaoxiang Xu
- Department of Chemistry; Tongji University; 1239 Siping Road Shanghai 200092 P.R China
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138
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Plaisance CP, van Santen RA. Structure Sensitivity of the Oxygen Evolution Reaction Catalyzed by Cobalt(II,III) Oxide. J Am Chem Soc 2015; 137:14660-72. [PMID: 26479891 DOI: 10.1021/jacs.5b07779] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Quantum chemical calculations and simulated kinetics were used to examine the structure sensitivity of the oxygen evolution reaction on several surface terminations of Co3O4. Active sites consisting of two adjacent Co(IV) cations connected by bridging oxos were identified on both the (001) and (311) surfaces. Formation of the O-O bond proceeds on these sites by nucleophilic attack of water on a bridging oxo. It was found that the relative turnover frequencies for the different sites are highly dependent on the overpotential, with the dual-Co site on the (311) surface being most active at medium overpotentials (0.46-0.77 V), where O-O bond formation by water addition is rate limiting. A similar dual-Co site on the (001) surface is most active at low overpotentials (<0.46 V), where O2 release is rate limiting, and a single-Co site on the (110) surface is most active at overpotentials that are high enough (>0.77 V) to form a significant concentration of highly reactive terminal Co(V)═O species. Two overpotential-dependent Sabatier relationships were identified based on the Brønsted basicity and redox potential of the active site, explaining the change in the active site with overpotential. The (311) dual-Co site that is most active in the medium overpotential range is consistent with recent experimental observations suggesting that a defect site is responsible for the observed oxygen evolution activity and that a modest concentration of superoxo intermediates is present on the surface. Importantly, we find that it is essential to consider the kinetics of the water addition and O2 release steps rather than only the thermodynamics.
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Affiliation(s)
- Craig P Plaisance
- Institute for Complex Molecular Systems and Laboratory of Inorganic Materials Chemistry, Schuit Institute of Catalysis, Eindhoven University of Technology , 5612 AZ, Eindhoven, The Netherlands
| | - Rutger A van Santen
- Institute for Complex Molecular Systems and Laboratory of Inorganic Materials Chemistry, Schuit Institute of Catalysis, Eindhoven University of Technology , 5612 AZ, Eindhoven, The Netherlands
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139
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Nguyen AI, Ziegler MS, Oña-Burgos P, Sturzbecher-Hohne M, Kim W, Bellone DE, Tilley TD. Mechanistic Investigations of Water Oxidation by a Molecular Cobalt Oxide Analogue: Evidence for a Highly Oxidized Intermediate and Exclusive Terminal Oxo Participation. J Am Chem Soc 2015; 137:12865-72. [PMID: 26390993 DOI: 10.1021/jacs.5b08396] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Artificial photosynthesis (AP) promises to replace society's dependence on fossil energy resources via conversion of sunlight into sustainable, carbon-neutral fuels. However, large-scale AP implementation remains impeded by a dearth of cheap, efficient catalysts for the oxygen evolution reaction (OER). Cobalt oxide materials can catalyze the OER and are potentially scalable due to the abundance of cobalt in the Earth's crust; unfortunately, the activity of these materials is insufficient for practical AP implementation. Attempts to improve cobalt oxide's activity have been stymied by limited mechanistic understanding that stems from the inherent difficulty of characterizing structure and reactivity at surfaces of heterogeneous materials. While previous studies on cobalt oxide revealed the intermediacy of the unusual Co(IV) oxidation state, much remains unknown, including whether bridging or terminal oxo ligands form O2 and what the relevant oxidation states are. We have addressed these issues by employing a homogeneous model for cobalt oxide, the [Co(III)4] cubane (Co4O4(OAc)4py4, py = pyridine, OAc = acetate), that can be oxidized to the [Co(IV)Co(III)3] state. Upon addition of 1 equiv of sodium hydroxide, the [Co(III)4] cubane is regenerated with stoichiometric formation of O2. Oxygen isotopic labeling experiments demonstrate that the cubane core remains intact during this stoichiometric OER, implying that terminal oxo ligands are responsible for forming O2. The OER is also examined with stopped-flow UV-visible spectroscopy, and its kinetic behavior is modeled, to surprisingly reveal that O2 formation requires disproportionation of the [Co(IV)Co(III)3] state to generate an even higher oxidation state, formally [Co(V)Co(III)3] or [Co(IV)2Co(III)2]. The mechanistic understanding provided by these results should accelerate the development of OER catalysts leading to increasingly efficient AP systems.
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Affiliation(s)
- Andy I Nguyen
- Department of Chemistry, University of California at Berkeley , Berkeley, California 94720-1460, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Micah S Ziegler
- Department of Chemistry, University of California at Berkeley , Berkeley, California 94720-1460, United States
| | - Pascual Oña-Burgos
- Department of Chemistry and Physics, University of Almería , Carretera de Sacramento s/n, 04120 Almería, Spain
| | - Manuel Sturzbecher-Hohne
- Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Wooyul Kim
- Physical Biosciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
| | - Donatela E Bellone
- Department of Chemistry, University of California at Berkeley , Berkeley, California 94720-1460, United States
| | - T Don Tilley
- Department of Chemistry, University of California at Berkeley , Berkeley, California 94720-1460, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States
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140
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Kim H, Park J, Park I, Jin K, Jerng SE, Kim SH, Nam KT, Kang K. Coordination tuning of cobalt phosphates towards efficient water oxidation catalyst. Nat Commun 2015; 6:8253. [PMID: 26365091 PMCID: PMC4579784 DOI: 10.1038/ncomms9253] [Citation(s) in RCA: 175] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 07/31/2015] [Indexed: 12/11/2022] Open
Abstract
The development of efficient and stable water oxidation catalysts is necessary for the realization of practically viable water-splitting systems. Although extensive studies have focused on the metal-oxide catalysts, the effect of metal coordination on the catalytic ability remains still elusive. Here we select four cobalt-based phosphate catalysts with various cobalt- and phosphate-group coordination as a platform to better understand the catalytic activity of cobalt-based materials. Although they exhibit various catalytic activities and stabilities during water oxidation, Na2CoP2O7 with distorted cobalt tetrahedral geometry shows high activity comparable to that of amorphous cobalt phosphate under neutral conditions, along with high structural stability. First-principles calculations suggest that the surface reorganization by the pyrophosphate ligand induces a highly distorted tetrahedral geometry, where water molecules can favourably bind, resulting in a low overpotential (∼0.42 eV). Our findings emphasize the importance of local cobalt coordination in the catalysis and suggest the possible effect of polyanions on the water oxidation chemistry.
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Affiliation(s)
- Hyunah Kim
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | - Jimin Park
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
- Center for Biomaterials, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 136-791, Republic of Korea
| | - Inchul Park
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | - Kyoungsuk Jin
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | - Sung Eun Jerng
- Western Seoul Center, Korea Basic Science Institute (KBSI), 150, Bukahyeon ro, Seodaemun-gu, Seoul 120-140, Korea
| | - Sun Hee Kim
- Western Seoul Center, Korea Basic Science Institute (KBSI), 150, Bukahyeon ro, Seodaemun-gu, Seoul 120-140, Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | - Kisuk Kang
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
- Center for Nanoparticle Research, Institute for Basic Science (IBS), Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
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141
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Bau JA, Luber EJ, Buriak JM. Oxygen Evolution Catalyzed by Nickel-Iron Oxide Nanocrystals with a Nonequilibrium Phase. ACS APPLIED MATERIALS & INTERFACES 2015; 7:19755-19763. [PMID: 26293239 DOI: 10.1021/acsami.5b05594] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Mixed nickel-iron oxides are of great interest as electrocatalysts for the oxygen evolution reaction (OER), the kinetically challenging half-reaction required for the generation of hydrogen gas from water via electrolysis. Previously, we had reported the synthesis of single crystal, soluble nickel-iron oxide nanoparticles over a wide range of nickel:iron compositions, with a metastable cubic rock salt phase ([Ni,Fe]O) that can be isolated despite the low solubility of iron in cubic nickel oxide at ambient temperatures. Here, activity for OER was examined, catalyzed by these [Ni,Fe]O nanoparticles integrated with indium tin oxide (ITO) electrodes. Because the as-prepared [Ni,Fe]O nanoparticles are oleate-capped, the surface ligands needed to be removed to induce adherence to the ITO substrate, and to enable charge transfer and contact with water to enable OER catalysis. Two different approaches were taken to reduce or eliminate the coverage of oleate ligands in these films: UV irradiation (254 nm) and air plasma. UV irradiation proved to lead to better results in terms of stable and OER-active films at pH 13. Kinetic analysis revealed that the Tafel slopes of these nanoparticle [Ni,Fe]O OER electrodes were limited by the electrochemical surface area and were found to be within the range of 30 to 50 mV/decade. Across the four compositions of Ni:Fe studied, from 24:76 to 88:12, the observed overpotential at 10 mA/cm2 for the OER in basic conditions decreased from 0.47 to 0.30 V as the proportion of nickel increased from 24% to 88%.
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Affiliation(s)
- Jeremy A Bau
- National Institute for Nanotechnology (NINT), National Research Council, 11421 Saskatchewan Drive, Edmonton, Alberta T6G 2M9, Canada
- Department of Chemistry, University of Alberta , Edmonton, Alberta T6G 2G2, Canada
| | - Erik J Luber
- National Institute for Nanotechnology (NINT), National Research Council, 11421 Saskatchewan Drive, Edmonton, Alberta T6G 2M9, Canada
- Department of Chemistry, University of Alberta , Edmonton, Alberta T6G 2G2, Canada
| | - Jillian M Buriak
- National Institute for Nanotechnology (NINT), National Research Council, 11421 Saskatchewan Drive, Edmonton, Alberta T6G 2M9, Canada
- Department of Chemistry, University of Alberta , Edmonton, Alberta T6G 2G2, Canada
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142
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Gupta S, Kellogg W, Xu H, Liu X, Cho J, Wu G. Bifunctional Perovskite Oxide Catalysts for Oxygen Reduction and Evolution in Alkaline Media. Chem Asian J 2015; 11:10-21. [PMID: 26247625 DOI: 10.1002/asia.201500640] [Citation(s) in RCA: 168] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2015] [Indexed: 11/10/2022]
Abstract
Oxygen electrocatalysis, namely of the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), governs the performance of numerous electrochemical energy systems such as reversible fuel cells, metal-air batteries, and water electrolyzers. However, the sluggish kinetics of these two reactions and their dependency on expensive noble metal catalysts (e.g, Pt or Ir) prohibit the sustainable commercialization of these highly innovative and in-demand technologies. Bifunctional perovskite oxides have emerged as a new class of highly efficient non-precious metal catalysts (NPMC) for oxygen electrocatalysis in alkaline media. In this review, we discuss the state-of-the-art understanding of bifunctional properties of perovskites with regards to their OER/ORR activity in alkaline media and review the associated reaction mechanisms on the oxides surface and the related activity descriptors developed in the recent literature. We also summarize the present strategies to modify their electronic structure and to further improve their performance for the ORR/OER through highlighting the new concepts relating to the role of surface redox chemistry and oxygen deficiency of perovskite oxides for the ORR/OER activity. In addition, we provide a brief account of recently developed advanced perovskite-nanocarbon hybrid bifunctional catalysts with much improved performances.
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Affiliation(s)
- Shiva Gupta
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York, 14260, United States
| | - William Kellogg
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York, 14260, United States
| | - Hui Xu
- Giner Inc., Newton, MA, 02466, United States
| | - Xien Liu
- School of Energy and Chemical Engineering, National Institute of Science and Technology (UNIST), Ulsan, 689-798, Korea
| | - Jaephil Cho
- School of Energy and Chemical Engineering, National Institute of Science and Technology (UNIST), Ulsan, 689-798, Korea.
| | - Gang Wu
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York, 14260, United States.
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143
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Yang Y, Zhou M, Guo W, Cui X, Li Y, Liu F, Xiao P, Zhang Y. NiCoO2 nanowires grown on carbon fiber paper for highly efficient water oxidation. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.05.159] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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144
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3D graphene foam-supported cobalt phosphate and borate electrocatalysts for high-efficiency water oxidation. Sci Bull (Beijing) 2015. [DOI: 10.1007/s11434-015-0861-5] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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145
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High-valent metal-oxo intermediates in energy demanding processes: from dioxygen reduction to water splitting. Curr Opin Chem Biol 2015; 25:159-71. [DOI: 10.1016/j.cbpa.2015.01.014] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2014] [Revised: 01/20/2015] [Accepted: 01/21/2015] [Indexed: 11/15/2022]
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146
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Crandell DW, Ghosh S, Berlinguette CP, Baik MH. How a [Co(IV) a bond and a half O](2+) fragment oxidizes water: involvement of a biradicaloid [Co(II)-(⋅O⋅)](2+) species in forming the O-O bond. CHEMSUSCHEM 2015; 8:844-852. [PMID: 25641853 DOI: 10.1002/cssc.201403024] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Indexed: 06/04/2023]
Abstract
The mechanism of water oxidation performed by a recently discovered cobalt complex [Co(Py5)(OH2)](ClO4)2 (1; Py5=2,6-(bis(bis-2-pyridyl)-methoxymethane)pyridine) was examined using quantum chemical models based on density functional theory. The computer models were first benchmarked against the experimental cyclic voltammetry data to identify the catalytically competent resting state of the catalyst, which was thought to contain a Co(IV) -oxyl complex. The electronic structure calculations suggest that the low-spin doublet state is energetically most favorable, but the catalytically most active species is the intermediate-spin quartet complex that is almost isoenergetic with the doublet state. The electronic structure of the quartet state shows significant spin polarization on the terminal oxygen atom, which is consistent with an intramolecular electron transfer from the oxygen to the metal. Based on the calculated spin densities, the formally [Co(IV) a bond and a half O] can be viewed as a biradicaloid [Co(II)-(⋅O⋅)](2+), that is, a cobalt-oxene moiety. This electronic structure is reminiscent of many other systems where similar electronic patterns were proposed to be responsible for the oxidative reactivity. In this context, this first-row transition-metal system constitutes a logical extension, because the oxyl-radical character is maximized by using the more easily accessible high-spin configurations in which two half-filled Co-dπ orbitals can work in concert to maximize the oxyl-radical character to ultimately afford a new reactive intermediate that can be characterized as carrying a biradicaloid oxene moiety with a formal oxidation state of zero. This conceptual proposal for the catalytically active species provides a plausible rationale for the remarkable oxidative reactivity.
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Affiliation(s)
- Douglas W Crandell
- Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, IN 47405, (USA)
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147
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Martirez JMP, Kim S, Morales EH, Diroll BT, Cargnello M, Gordon TR, Murray CB, Bonnell DA, Rappe AM. Synergistic Oxygen Evolving Activity of a TiO2-Rich Reconstructed SrTiO3(001) Surface. J Am Chem Soc 2015; 137:2939-47. [DOI: 10.1021/ja511332y] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
| | - Seungchul Kim
- Center
for Computational Science, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
| | - Erie H. Morales
- Department
of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104−6202 United States
| | | | | | | | - Christopher B. Murray
- Department
of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104−6202 United States
| | - Dawn A. Bonnell
- Department
of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104−6202 United States
| | - Andrew M. Rappe
- Department
of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104−6202 United States
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148
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Walden AG, Miller AJM. Rapid water oxidation electrocatalysis by a ruthenium complex of the tripodal ligand tris(2-pyridyl)phosphine oxide. Chem Sci 2015; 6:2405-2410. [PMID: 28706656 PMCID: PMC5488214 DOI: 10.1039/c5sc00032g] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 02/04/2015] [Indexed: 01/17/2023] Open
Abstract
The tris(2-pyridyl)phosphine oxide (Py3PO) complex [Ru(Py3PO)(bpy)(OH2)]2+ (bpy is 2,2'-bipyridine) is a pH-dependent water oxidation electrocatalyst that accelerates dramatically with increasing pH-up to 780 s-1 at pH 10 (∼1 V overpotential). Despite retaining the pentakis(pyridine) ligand arrangement common to previously reported catalysts, the tripodal Py3PO ligand framework supports much faster electrocatalysis. The early stages of the catalytic cycle are proposed to follow the typical pattern of single-site ruthenium catalysts, with two sequential 1H+/1e- proton-coupled electron transfer (PCET) oxidations, but the pH-dependent onset of catalysis and rapid rates are distinguishing features of the present system.
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Affiliation(s)
- Andrew G Walden
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , NC 27599-3290 , USA .
| | - Alexander J M Miller
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , NC 27599-3290 , USA .
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149
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Yu L, Wang J, Guo D, You W, Liu M, Zhang L, Li C. The kinetics and mechanism of photo-assisted Ag(i)-catalysed water oxidation with S2O82−. Dalton Trans 2015; 44:710-7. [DOI: 10.1039/c4dt02254h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
It is reported that visible light (λ ≥ 400 nm) can improve Ag(i)-catalyzed water oxidation into O2 with S2O82− remarkably. The photo-assistant results from the absorbance of the AgO+ species at 375 nm, promoting the rate-determining step (AgO+ + H2O → Ag+ + H2O2). A reasonable mechanism has been proposed.
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Affiliation(s)
- Lihong Yu
- Institute of Chemistry for Functionalized Materials
- Liaoning Normal University
- Dalian
- P. R. China
| | - Jidan Wang
- Institute of Chemistry for Functionalized Materials
- Liaoning Normal University
- Dalian
- P. R. China
| | - Dan Guo
- Institute of Chemistry for Functionalized Materials
- Liaoning Normal University
- Dalian
- P. R. China
| | - Wansheng You
- Institute of Chemistry for Functionalized Materials
- Liaoning Normal University
- Dalian
- P. R. China
| | - Meiying Liu
- Institute of Chemistry for Functionalized Materials
- Liaoning Normal University
- Dalian
- P. R. China
| | - Lancui Zhang
- Institute of Chemistry for Functionalized Materials
- Liaoning Normal University
- Dalian
- P. R. China
| | - Can Li
- State Key Laboratory of Catalysis
- Dalian Institute of Chemical Physics
- The Chinese Academy of Sciences
- Dalian 116023
- P. R. China
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150
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Huang X, Xie M, Chen Y, Zong Q, Liu Z, Jin Y. Copper–silver oxide nanowires grown on an alloy electrode as an efficient electrocatalyst for water oxidation. RSC Adv 2015. [DOI: 10.1039/c5ra00820d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An efficient oxygen-evolving electrode is facilely fabricated based on CuO–Ag2O nanowires grown in situ on an alloy substrate.
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Affiliation(s)
- Xing Huang
- Department of Materials Science and Engineering
- Sichuan University
- Chengdu 610064
- China
- College of Aerospace and Materials Engineering
| | - Minghao Xie
- Department of Materials Science and Engineering
- Sichuan University
- Chengdu 610064
- China
| | - Yihan Chen
- Department of Materials Science and Engineering
- Sichuan University
- Chengdu 610064
- China
| | - Qingshuang Zong
- Department of Materials Science and Engineering
- Sichuan University
- Chengdu 610064
- China
| | - Ziyu Liu
- Department of Materials Science and Engineering
- Sichuan University
- Chengdu 610064
- China
| | - Yong Jin
- Department of Materials Science and Engineering
- Sichuan University
- Chengdu 610064
- China
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