1
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Lu X, Shinagawa T, Takanabe K. Product Distribution Control Guided by a Microkinetic Analysis for CO Reduction at High-Flux Electrocatalysis Using Gas-Diffusion Cu Electrodes. ACS Catal 2023. [DOI: 10.1021/acscatal.2c04802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Xiaofei Lu
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8656, Japan
| | - Tatsuya Shinagawa
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8656, Japan
| | - Kazuhiro Takanabe
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo113-8656, Japan
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2
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Nishimoto T, Shinagawa T, Naito T, Harada K, Yoshida M, Takanabe K. High Current Density Oxygen Evolution in Carbonate Buffered Solution Achieved by Active Site Densification and Electrolyte Engineering. ChemSusChem 2023; 16:e202201808. [PMID: 36341589 PMCID: PMC10100521 DOI: 10.1002/cssc.202201808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 10/20/2022] [Indexed: 06/16/2023]
Abstract
High current density reaching 1 A cm-2 for efficient oxygen evolution reaction (OER) was demonstrated by interactively optimizing electrolyte and electrode at non-extreme pH levels. Careful electrolyte assessment revealed that the state-of-the-art nickel-iron oxide electrocatalyst in alkaline solution maintained its high OER performance with a small Tafel slope in K-carbonate solution at pH 10.5 at 353 K. The OER performance was improved when Cu or Au was introduced into the FeOx -modified nanostructured Ni electrode as the third element during the preparation of electrode by electrodeposition. The resultant OER achieved 1 A cm-2 at 1.53 V vs. reversible hydrogen electrode (RHE) stably for 90 h, comparable to those in extreme alkaline conditions. Constant Tafel slopes, apparent activation energy, and the same signatures from operando X-ray absorption spectroscopy among these samples suggested that this improvement seems solely correlated with enhanced electrochemical surface area caused by adding the third element.
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Affiliation(s)
- Takeshi Nishimoto
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Tatsuya Shinagawa
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Takahiro Naito
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Kazuki Harada
- Department of Applied ChemistryGraduate School of Sciences and Technology for InnovationYamaguchi University2-16-1 Tokiwadai, UbeYamaguchiJapan
| | - Masaaki Yoshida
- Department of Applied ChemistryGraduate School of Sciences and Technology for InnovationYamaguchi University2-16-1 Tokiwadai, UbeYamaguchiJapan
- Blue Energy Center for SGE Technology (BEST)Yamaguchi University2-16-1 Tokiwadai, UbeYamaguchiJapan
| | - Kazuhiro Takanabe
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
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3
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Komiya H, Shinagawa T, Takanabe K. Electrolyte Engineering for Oxygen Evolution Reaction Over Non-Noble Metal Electrodes Achieving High Current Density in the Presence of Chloride Ion. ChemSusChem 2022; 15:e202201088. [PMID: 35921042 PMCID: PMC9804667 DOI: 10.1002/cssc.202201088] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 07/17/2022] [Indexed: 06/15/2023]
Abstract
Direct seawater electrolysis potentially simplifies the electrolysis process and leads to a decrease in the cost of green hydrogen production. However, impurities present in the seawater, especially chloride ions (Cl- ), cause corrosion of the electrode material, and its oxidation competes with the anodic oxygen evolution reaction (OER). By carefully tuning electrode substrate and electrolyte solutions, the CoFeOx Hy /Ti electrode with high double-layer capacitance actively and stably electro-catalyzed the OER in potassium borate solutions at pH 9.2 in the presence of 0.5 mol kg-1 Cl- . The electrode possesses an active site motif composed of either a Co- or Fe-domain and benefits from an enlarged surface area. Selective OER was demonstrated in Cl- -containing electrolyte solutions at an elevated reaction temperature, stably achieving 500 mA cm-2 at a mere potential of 1.67 V vs. reversible hydrogen electrode (RHE) at 353 K for multiple on-off and long-term testing processes with a faradaic efficiency of unity toward the OER.
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Affiliation(s)
- Hiroki Komiya
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyoJapan
| | - Tatsuya Shinagawa
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyoJapan
| | - Kazuhiro Takanabe
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 HongoBunkyo-kuTokyoJapan
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4
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Naito T, Shinagawa T, Nishimoto T, Takanabe K. Gas Crossover Regulation by Porosity-Controlled Glass Sheet Achieves Pure Hydrogen Production by Buffered Water Electrolysis at Neutral pH. ChemSusChem 2022; 15:e202102294. [PMID: 34907667 PMCID: PMC9306655 DOI: 10.1002/cssc.202102294] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 12/10/2021] [Indexed: 06/14/2023]
Abstract
Near-neutral pH water electrolysis driven by renewable electricity can reduce the costs of clean hydrogen generation, but its low efficiency and gas crossover in industrially relevant conditions remain a challenge. Here, it was shown that electrolyte engineering could suppress the crossover of dissolved gases such as O2 by regulating their diffusion flux. In addition, a hydrophilized mechanically stable glass sheet was found to block the permeation of gas bubbles, further enhancing the purity of evolved gas from water electrolysis. This sheet had a lower resistance than conventional diaphragms such as Zirfon due to its high porosity and small thickness. A saturated K-phosphate solution at pH 7.2 was used as an electrolyte together with the hydrophilized glass sheet as a gas-separator. This led to a near-neutral pH water electrolysis with 100 mA cm-2 at a total cell voltage of 1.56 V with 99.9 % purity of produced H2 .
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Affiliation(s)
- Takahiro Naito
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyo113-8656Japan
| | - Tatsuya Shinagawa
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyo113-8656Japan
| | - Takeshi Nishimoto
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyo113-8656Japan
| | - Kazuhiro Takanabe
- Department of Chemical System EngineeringSchool of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyo113-8656Japan
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5
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Qi X, Shinagawa T, Lu X, Yui Y, Ibe M, Takanabe K. Surface coverage control for dramatic enhancement of thermal CO oxidation by precise potential tuning of metal supported catalysts. Chem Sci 2022; 13:9774-9783. [PMID: 36091892 PMCID: PMC9400665 DOI: 10.1039/d2sc03145k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 07/27/2022] [Indexed: 11/21/2022] Open
Abstract
External potential control allows reactant coverage control on the catalyst, in this case to suppress excessive CO adsorption, leading to improved thermal CO oxidation performance.
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Affiliation(s)
- Xingyu Qi
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
| | - Tatsuya Shinagawa
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
| | - Xiaofei Lu
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
| | - Yuhki Yui
- Advanced Material Engineering Division, Higashifuji Technical Center, Toyota Motor Corporation, 1200 Mishuku, Susono, Shizuoka, Japan
| | - Masaya Ibe
- Advanced Material Engineering Division, Higashifuji Technical Center, Toyota Motor Corporation, 1200 Mishuku, Susono, Shizuoka, Japan
| | - Kazuhiro Takanabe
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
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6
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Lu X, Ahsaine HA, Dereli B, Garcia-Esparza AT, Reinhard M, Shinagawa T, Li D, Adil K, Tchalala MR, Kroll T, Eddaoudi M, Sokaras D, Cavallo L, Takanabe K. Operando Elucidation on the Working State of Immobilized Fluorinated Iron Porphyrin for Selective Aqueous Electroreduction of CO 2 to CO. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01157] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Xiaofei Lu
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Hassan Ait Ahsaine
- KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Busra Dereli
- KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Angel T. Garcia-Esparza
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Marco Reinhard
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Tatsuya Shinagawa
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Duanxing Li
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Karim Adil
- Functional Materials Design, Discovery and Development Research Group (FMD3), Advanced Membranes and Porous Materials Center (AMPMC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Mohamed Rachid Tchalala
- Functional Materials Design, Discovery and Development Research Group (FMD3), Advanced Membranes and Porous Materials Center (AMPMC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Thomas Kroll
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Mohamed Eddaoudi
- Functional Materials Design, Discovery and Development Research Group (FMD3), Advanced Membranes and Porous Materials Center (AMPMC), Division of Physical Sciences and Engineering (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia
| | - Dimosthenis Sokaras
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Luigi Cavallo
- KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Kazuhiro Takanabe
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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7
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Nishimoto T, Shinagawa T, Naito T, Takanabe K. Delivering the Full Potential of Oxygen Evolving Electrocatalyst by Conditioning Electrolytes at Near-Neutral pH. ChemSusChem 2021; 14:1554-1564. [PMID: 33481326 PMCID: PMC8048901 DOI: 10.1002/cssc.202002813] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 01/12/2021] [Indexed: 05/06/2023]
Abstract
This study reports on the impact of identity and compositions of buffer ions on oxygen evolution reaction (OER) performance at a wide range of pH levels using a model IrOx electrocatalyst. Rigorous microkinetic analysis employing kinetic isotope effects, Tafel analysis, and temperature dependence measurement was conducted to establish rate expression isolated from the diffusion contribution of buffer ions and solution resistance. It was found that the OER kinetics was facile with OH- oxidation compared to H2 O, the results of which were highlighted by mitigating over 200 mV overpotential in the presence of buffer to reach 10 mA cm-2 . This improvement was ascribed to the involvement of the kinetics of the local OH- supply by the buffering action. Further digesting the kinetic data at various buffer pKa and the solution bulk pH disclosed a trade-off between the exchange current density and the Tafel slope, indicating that the optimal electrolyte condition can be chosen at a different range of current density. This study provides a quantitative guideline for electrolyte engineering to maximize the intrinsic OER performance that electrocatalyst possesses especially at near-neutral pH.
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Affiliation(s)
- Takeshi Nishimoto
- Department of Chemical System Engineering, School of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Tatsuya Shinagawa
- Department of Chemical System Engineering, School of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Takahiro Naito
- Department of Chemical System Engineering, School of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Kazuhiro Takanabe
- Department of Chemical System Engineering, School of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
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8
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Abstract
Recent spectroscopic and computational studies concerning the oxygen evolution reaction over iridium oxides are reviewed to provide the state-of-the-art understanding of its reaction mechanism.
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Affiliation(s)
- Takahiro Naito
- Department of Chemical System Engineering
- School of Engineering
- The University of Tokyo
- Tokyo
- Japan
| | - Tatsuya Shinagawa
- Department of Chemical System Engineering
- School of Engineering
- The University of Tokyo
- Tokyo
- Japan
| | - Takeshi Nishimoto
- Department of Chemical System Engineering
- School of Engineering
- The University of Tokyo
- Tokyo
- Japan
| | - Kazuhiro Takanabe
- Department of Chemical System Engineering
- School of Engineering
- The University of Tokyo
- Tokyo
- Japan
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9
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Qi X, Shinagawa T, Kishimoto F, Takanabe K. Determination and perturbation of the electronic potentials of solid catalysts for innovative catalysis. Chem Sci 2020; 12:540-545. [PMID: 34163783 PMCID: PMC8179014 DOI: 10.1039/d0sc05148a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Concerns about energy and the environment are motivating a reexamination of catalytic processes, aiming to achieve more efficient and improved catalysis compatible with sustainability. Designing an active site for such heterogeneous catalytic processes remains a challenge leading to a next level breakthrough. Herein, we discuss a fundamental aspect of heterogeneous catalysis: the chemical potential of electrons in solid catalysts during thermal catalysis, which directly reflects the consequent catalytic reaction rate. The use of electrochemical tools during thermal catalysis allows for the quantitative determination of the ill-defined chemical potentials of solids in operando, whereby the potential-rate relationship can be established. Furthermore, the electrochemical means can also introduce the direct perturbation of catalyst potentials, in turn, perturbing the coverage of adsorbates functioning as poison, promoters, or reactants. We collect selected publications on these aspects, and provide a viewpoint bridging the fields of thermal- and electro-catalysis.
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Affiliation(s)
- Xingyu Qi
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo Japan
| | - Tatsuya Shinagawa
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo Japan
| | - Fuminao Kishimoto
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo Japan
| | - Kazuhiro Takanabe
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo Japan
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10
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Naito T, Shinagawa T, Nishimoto T, Takanabe K. Water Electrolysis in Saturated Phosphate Buffer at Neutral pH. ChemSusChem 2020; 13:5921-5933. [PMID: 32875653 PMCID: PMC7756658 DOI: 10.1002/cssc.202001886] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 08/31/2020] [Indexed: 05/22/2023]
Abstract
Hydrogen production from renewable energy and ubiquitous water has a potential to achieve sustainability, although current water electrolyzers cannot compete economically with the fossil fuel-based technology. Here, we evaluate water electrolysis at pH 7 that is milder than acidic and alkaline pH counterparts and may overcome this issue. The physicochemical properties of concentrated buffer electrolytes were assessed at various temperatures and molalities for quantitative determination of losses associated with mass-transport during the water electrolysis. Subsequently, in saturated K-phosphate solutions at 80 °C and 100 °C that were found to be optimal to minimize the losses originating from mass-transport at the neutral pH, the water electrolysis performance over model electrodes of IrOx and Pt as an anode and a cathode, respectively, was reasonably comparable with those of the extreme pH. Remarkably, this concentrated buffer solution also achieved enhanced stability, adding another merit of this electrolyte for water electrolysis.
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Affiliation(s)
- Takahiro Naito
- Department of ChemicalSystem Engineering, School of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Tatsuya Shinagawa
- Department of ChemicalSystem Engineering, School of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Takeshi Nishimoto
- Department of ChemicalSystem Engineering, School of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
| | - Kazuhiro Takanabe
- Department of ChemicalSystem Engineering, School of EngineeringThe University of Tokyo7-3-1 Hongo, Bunkyo-kuTokyoJapan
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11
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Li D, Baslyman WS, Siritanaratkul B, Shinagawa T, Sarathy SM, Takanabe K. Oxidative-Coupling-Assisted Methane Aromatization: A Simulation Study. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b04602] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Duanxing Li
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Walaa S. Baslyman
- King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE), 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Bhavin Siritanaratkul
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Tatsuya Shinagawa
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - S. Mani Sarathy
- King Abdullah University of Science and Technology (KAUST), Clean Combustion Research Center (CCRC) and Physical Sciences and Engineering Division (PSE), 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Kazuhiro Takanabe
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
- King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE), 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012 Japan
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12
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Shinagawa T, Obata K, Takanabe K. Switching of Kinetically Relevant Reactants for the Aqueous Cathodic Process Determined by Mass‐transport Coupled with Protolysis. ChemCatChem 2019. [DOI: 10.1002/cctc.201901459] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Tatsuya Shinagawa
- Department of Chemical System Engineering School of EngineeringThe University of Tokyo Tokyo 113-8656 Japan
| | - Keisuke Obata
- Division of Physical Sciences and Engineering KAUST Catalysis Center (KCC)King Abdullah University of Science and Technology (KAUST) Thuwal 23955 Saudi Arabia
- Institute for Solar FuelsHelmholtz-Zentrum Berlin für Materialien und Energie GmbH Berlin 14109 Germany
| | - Kazuhiro Takanabe
- Department of Chemical System Engineering School of EngineeringThe University of Tokyo Tokyo 113-8656 Japan
- Division of Physical Sciences and Engineering KAUST Catalysis Center (KCC)King Abdullah University of Science and Technology (KAUST) Thuwal 23955 Saudi Arabia
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13
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Li J, Pršlja P, Shinagawa T, Martín Fernández AJ, Krumeich F, Artyushkova K, Atanassov P, Zitolo A, Zhou Y, García-Muelas R, López N, Pérez-Ramírez J, Jaouen F. Volcano Trend in Electrocatalytic CO2 Reduction Activity over Atomically Dispersed Metal Sites on Nitrogen-Doped Carbon. ACS Catal 2019. [DOI: 10.1021/acscatal.9b02594] [Citation(s) in RCA: 104] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jingkun Li
- Institut Charles Gerhardt Montpellier, UMR 5253, CNRS, Université Montpellier, ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
| | - Paulina Pršlja
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, Av. Països Catalans, 16, 43007 Tarragona, Spain
| | | | | | | | - Kateryna Artyushkova
- The Department of Chemical and Biological Engineering, Center for Micro-Engineered Materials (CMEM), University of New Mexico, Albuquerque, New Mexico 87131, United States
| | - Plamen Atanassov
- Chemical and Biomolecular Engineering, University of California Irvine, Irvine, California 92697, United States
| | - Andrea Zitolo
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48 Saint Aubin, 91192 Gif-sur-Yvette, France
| | - Yecheng Zhou
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, Av. Països Catalans, 16, 43007 Tarragona, Spain
| | - Rodrigo García-Muelas
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, Av. Països Catalans, 16, 43007 Tarragona, Spain
| | - Núria López
- Institute of Chemical Research of Catalonia, ICIQ, The Barcelona Institute of Science and Technology, Av. Països Catalans, 16, 43007 Tarragona, Spain
| | | | - Frédéric Jaouen
- Institut Charles Gerhardt Montpellier, UMR 5253, CNRS, Université Montpellier, ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
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14
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Hata K, Okada S, Shinagawa T, Toshiaki T, Kawai K, Nozawa H. Meta-analysis of the association of extraintestinal manifestations with the development of pouchitis in patients with ulcerative colitis. BJS Open 2019; 3:436-444. [PMID: 31463422 PMCID: PMC6706792 DOI: 10.1002/bjs5.50149] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2018] [Accepted: 01/18/2019] [Indexed: 12/13/2022] Open
Abstract
Background The presence of extraintestinal manifestations may be associated with the development of pouchitis in patients with ulcerative colitis after ileal pouch–anal anastomosis. The aim of this study was to assess this correlation. Methods A systematic literature search was performed using MEDLINE and the Cochrane Library. Studies published in English up to 22 May 2017 investigating the association between extraintestinal manifestations and development of pouchitis in adults with ulcerative colitis were included. Case reports were excluded. The association of extraintestinal manifestations with the development of overall and chronic pouchitis was investigated using a random‐effects model. Results Of 1010 citations identified, 22 observational studies comprising 5128 patients were selected for analysis. The presence of extraintestinal manifestations was significantly associated with both chronic pouchitis (odds ratio 2·28, 95 per cent c.i. 1·57 to 3·32; P = 0·001) and overall pouchitis (odds ratio 1·96, 1·49 to 2·57; P < 0·001). Conclusion The presence of extraintestinal manifestations is associated with development of pouchitis after ileal pouch–anal anastomosis.
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Affiliation(s)
- K Hata
- Department of Surgical Oncology The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo, 113-8655 Japan
| | - S Okada
- Department of Surgical Oncology The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo, 113-8655 Japan
| | - T Shinagawa
- Department of Surgical Oncology The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo, 113-8655 Japan
| | - T Toshiaki
- Department of Surgical Oncology The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo, 113-8655 Japan
| | - K Kawai
- Department of Surgical Oncology The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo, 113-8655 Japan
| | - H Nozawa
- Department of Surgical Oncology The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo, 113-8655 Japan
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15
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García-Muelas R, Dattila F, Shinagawa T, Martín AJ, Pérez-Ramírez J, López N. Origin of the Selective Electroreduction of Carbon Dioxide to Formate by Chalcogen Modified Copper. J Phys Chem Lett 2018; 9:7153-7159. [PMID: 30537834 PMCID: PMC6305183 DOI: 10.1021/acs.jpclett.8b03212] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Accepted: 12/11/2018] [Indexed: 05/30/2023]
Abstract
The electrochemical reduction of atmospheric CO2 by renewable electricity opens new routes to synthesize fuels and chemicals, but more selective and efficient catalysts are needed. Herein, by combining experimental and first-principles studies, we explain why chalcogen modified copper catalysts are selective toward formate as the only carbon product. On the unmodified copper, adsorbed CO2 is the key intermediate, yielding carbon monoxide and formate as carbon products. On sulfur, selenium, or tellurium modified copper, chalcogen adatoms are present on the surface and actively participate in the reaction, either by transferring a hydride or by tethering CO2 thus suppressing the formation of CO. These results highlight the active role of chalcogen centers via chemical steps and point toward basicity as the key descriptor for the stability and selectivity of these catalysts.
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Affiliation(s)
- Rodrigo García-Muelas
- Institute
of Chemical Research of Catalonia, The Barcelona
Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Federico Dattila
- Institute
of Chemical Research of Catalonia, The Barcelona
Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
| | - Tatsuya Shinagawa
- Institute
for Chemical and Bioengineering, Department of Chemistry and Applied
Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Antonio J. Martín
- Institute
for Chemical and Bioengineering, Department of Chemistry and Applied
Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Javier Pérez-Ramírez
- Institute
for Chemical and Bioengineering, Department of Chemistry and Applied
Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Núria López
- Institute
of Chemical Research of Catalonia, The Barcelona
Institute of Science and Technology, Av. Països Catalans 16, 43007 Tarragona, Spain
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16
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Shinagawa T, Larrazábal GO, Martín AJ, Krumeich F, Pérez-Ramírez J. Sulfur-Modified Copper Catalysts for the Electrochemical Reduction of Carbon Dioxide to Formate. ACS Catal 2018. [DOI: 10.1021/acscatal.7b03161] [Citation(s) in RCA: 145] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tatsuya Shinagawa
- Institute
for Chemical and Bioengineering, Department of Chemistry and Applied
Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Gastón O. Larrazábal
- Institute
for Chemical and Bioengineering, Department of Chemistry and Applied
Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Antonio J. Martín
- Institute
for Chemical and Bioengineering, Department of Chemistry and Applied
Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Frank Krumeich
- Laboratory
of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
| | - Javier Pérez-Ramírez
- Institute
for Chemical and Bioengineering, Department of Chemistry and Applied
Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland
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17
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Shinagawa T, Ng MTK, Takanabe K. Electrolyte Engineering towards Efficient Water Splitting at Mild pH. ChemSusChem 2017; 10:4155-4162. [PMID: 28846205 DOI: 10.1002/cssc.201701266] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 08/04/2017] [Indexed: 06/07/2023]
Abstract
The development of processes for the conversion of H2 O and CO2 driven by electricity generated by renewable means is essential to achieving sustainable energy and chemical cycles, in which the electrocatalytic oxygen evolution reaction (OER) is one of the bottlenecks. In this study, the influences of the electrolyte molarity and identity on the OER at alkaline to neutral pH were investigated at an appreciable current density of around 10 mA cm-2 , revealing both the clear boundary of reactant switching between H2 O/OH- , owing to the diffusion limitation of OH- , and the substantial contribution of the mass transport of the buffered species in buffered mild-pH conditions. These findings suggest a strategy of electrolyte engineering: tuning the electrolyte properties to maximize the mass-transport flux. The concept is successfully demonstrated for the OER, as well as overall water electrolysis in buffered mild-pH conditions, shedding light on the development of practical solar fuel production systems.
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Affiliation(s)
- Tatsuya Shinagawa
- King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center and Physical Sciences and Engineering Division, 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
- Present address: Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, ETH Zurich, Vladmir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
| | - Marcus Tze-Kiat Ng
- King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center and Physical Sciences and Engineering Division, 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| | - Kazuhiro Takanabe
- King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center and Physical Sciences and Engineering Division, 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
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18
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Garcia-Esparza AT, Shinagawa T, Ould-Chikh S, Qureshi M, Peng X, Wei N, Anjum DH, Clo A, Weng TC, Nordlund D, Sokaras D, Kubota J, Domen K, Takanabe K. An Oxygen-Insensitive Hydrogen Evolution Catalyst Coated by a Molybdenum-Based Layer for Overall Water Splitting. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701861] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Angel T. Garcia-Esparza
- KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE); King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Tatsuya Shinagawa
- KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE); King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Samy Ould-Chikh
- KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE); King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Muhammad Qureshi
- KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE); King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Xuyuan Peng
- KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE); King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Nini Wei
- Advanced Nanofabrication; Imaging and Characterization Core Lab; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Dalaver H. Anjum
- Advanced Nanofabrication; Imaging and Characterization Core Lab; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Alain Clo
- Research Computing; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Tsu-Chien Weng
- Center for High Pressure Science & Technology Advanced Research; 1690 Cailun Rd, Bldg. #6-408, Pudong Shanghai 201203 China
| | - Dennis Nordlund
- Stanford Synchrotron Radiation Lightsource; 2575 Sand Hill Road Menlo Park CA 94025 USA
| | - Dimosthenis Sokaras
- Stanford Synchrotron Radiation Lightsource; 2575 Sand Hill Road Menlo Park CA 94025 USA
| | - Jun Kubota
- Department of Chemical Engineering; Fukuoka University; 8-19-1 Nanakuma, Jonan-ku Fukuoka 814-0180 Japan
| | - Kazunari Domen
- Department of Chemical System Engineering; School of Engineering; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Kazuhiro Takanabe
- KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE); King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
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19
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Garcia-Esparza AT, Shinagawa T, Ould-Chikh S, Qureshi M, Peng X, Wei N, Anjum DH, Clo A, Weng TC, Nordlund D, Sokaras D, Kubota J, Domen K, Takanabe K. An Oxygen-Insensitive Hydrogen Evolution Catalyst Coated by a Molybdenum-Based Layer for Overall Water Splitting. Angew Chem Int Ed Engl 2017; 56:5780-5784. [PMID: 28407339 DOI: 10.1002/anie.201701861] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 03/04/2017] [Indexed: 11/07/2022]
Abstract
For overall water-splitting systems, it is essential to establish O2 -insensitive cathodes that allow cogeneration of H2 and O2 . An acid-tolerant electrocatalyst is described, which employs a Mo-coating on a metal surface to achieve selective H2 evolution in the presence of O2 . In operando X-ray absorption spectroscopy identified reduced Pt covered with an amorphous molybdenum oxyhydroxide hydrate with a local structural order composed of polyanionic trimeric units of molybdenum(IV). The Mo layer likely hinders O2 gas permeation, impeding contact with active Pt. Photocatalytic overall water splitting proceeded using MoOx /Pt/SrTiO3 with inhibited water formation from H2 and O2 , which is the prevailing back reaction on the bare Pt/SrTiO3 photocatalyst. The Mo coating was stable in acidic media for multiple hours of overall water splitting by membraneless electrolysis and photocatalysis.
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Affiliation(s)
- Angel T Garcia-Esparza
- KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Tatsuya Shinagawa
- KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Samy Ould-Chikh
- KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Muhammad Qureshi
- KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Xuyuan Peng
- KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Nini Wei
- Advanced Nanofabrication, Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Dalaver H Anjum
- Advanced Nanofabrication, Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Alain Clo
- Research Computing, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Tsu-Chien Weng
- Center for High Pressure Science & Technology Advanced Research, 1690 Cailun Rd, Bldg. #6-408, Pudong, Shanghai, 201203, China
| | - Dennis Nordlund
- Stanford Synchrotron Radiation Lightsource, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Dimosthenis Sokaras
- Stanford Synchrotron Radiation Lightsource, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Jun Kubota
- Department of Chemical Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka, 814-0180, Japan
| | - Kazunari Domen
- Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Kazuhiro Takanabe
- KAUST Catalysis Center (KCC) and Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
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20
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Shinagawa T, Takanabe K. Towards Versatile and Sustainable Hydrogen Production through Electrocatalytic Water Splitting: Electrolyte Engineering. ChemSusChem 2017; 10:1318-1336. [PMID: 27984671 PMCID: PMC5413865 DOI: 10.1002/cssc.201601583] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 12/15/2016] [Indexed: 05/22/2023]
Abstract
Recent advances in power generation from renewable resources necessitate conversion of electricity to chemicals and fuels in an efficient manner. Electrocatalytic water splitting is one of the most powerful and widespread technologies. The development of highly efficient, inexpensive, flexible, and versatile water electrolysis devices is desired. This review discusses the significance and impact of the electrolyte on electrocatalytic performance. Depending on the circumstances under which the water splitting reaction is conducted, the required solution conditions, such as the identity and molarity of ions, may significantly differ. Quantitative understanding of such electrolyte properties on electrolysis performance is effective to facilitate the development of efficient electrocatalytic systems. The electrolyte can directly participate in reaction schemes (kinetics), affect electrode stability, and/or indirectly impact the performance by influencing the concentration overpotential (mass transport). This review aims to guide fine-tuning of the electrolyte properties, or electrolyte engineering, for (photo)electrochemical water splitting reactions.
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Affiliation(s)
- Tatsuya Shinagawa
- KAUST Catalysis Center and Physical Sciences and Engineering DivisionKing Abdullah University of Science and Technology (KAUST)4700 KAUSTThuwal23955-6900Saudi Arabia
| | - Kazuhiro Takanabe
- KAUST Catalysis Center and Physical Sciences and Engineering DivisionKing Abdullah University of Science and Technology (KAUST)4700 KAUSTThuwal23955-6900Saudi Arabia
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21
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Shinagawa T, Ng MTK, Takanabe K. Boosting the Performance of the Nickel Anode in the Oxygen Evolution Reaction by Simple Electrochemical Activation. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701642] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Tatsuya Shinagawa
- King Abdullah University of Science and Technology (KAUST); KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE); 4700 KAUST Thuwal 23955-6900 Saudi Arabia
| | - Marcus Tze-Kiat Ng
- King Abdullah University of Science and Technology (KAUST); KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE); 4700 KAUST Thuwal 23955-6900 Saudi Arabia
| | - Kazuhiro Takanabe
- King Abdullah University of Science and Technology (KAUST); KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE); 4700 KAUST Thuwal 23955-6900 Saudi Arabia
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22
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Shinagawa T, Ng MTK, Takanabe K. Boosting the Performance of the Nickel Anode in the Oxygen Evolution Reaction by Simple Electrochemical Activation. Angew Chem Int Ed Engl 2017; 56:5061-5065. [PMID: 28345220 DOI: 10.1002/anie.201701642] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Indexed: 11/07/2022]
Abstract
The development of cost-effective and active water-splitting electrocatalysts that work at mild pH is an essential step towards the realization of sustainable energy and material circulation in our society. Its success requires a drastic improvement in the kinetics of the anodic half-reaction of the oxygen evolution reaction (OER), which determines the overall system efficiency to a large extent. A simple electrochemical protocol has been developed to activate Ni electrodes, by which a stable NiOOH phase was formed, which could weakly bind to alkali-metal cations. The electrochemically activated (ECA) Ni electrode reached a current of 10 mA at <1.40 V vs. the reversible hydrogen electrode (RHE) at practical operation temperatures (>75 °C) and a mild pH of ca. 10 with excellent stability (>24 h), greatly surpassing that of the state-of-the-art NiFeOx electrodes under analogous conditions. Water electrolysis was demonstrated with ECA-Ni and NiMo, which required an iR-free overall voltage of only 1.44 V to reach 10 mA cmgeo-2 .
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Affiliation(s)
- Tatsuya Shinagawa
- King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| | - Marcus Tze-Kiat Ng
- King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| | - Kazuhiro Takanabe
- King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
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23
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Ziani A, Shinagawa T, Stegenburga L, Takanabe K. Generation of Transparent Oxygen Evolution Electrode Consisting of Regularly Ordered Nanoparticles from Self-Assembly Cobalt Phthalocyanine as a Template. ACS Appl Mater Interfaces 2016; 8:32376-32384. [PMID: 27813407 DOI: 10.1021/acsami.6b12006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The decoration of (photo)electrodes for efficient photoresponse requires the use of electrocatalysts with good dispersion and high transparency for efficient light absorption by the photoelectrode. As a result of the ease of thermal evaporation and particulate self-assembly growth, the phthalocyanine molecular species can be uniformly deposited layer-by-layer on the surface of substrates. This structure can be used as a template to achieve a tunable amount of catalysts, high dispersion of the nanoparticles, and transparency of the catalysts. In this study, we present a systematic study of the structural and optical properties, surface morphologies, and electrochemical oxygen evolution reaction (OER) performance of cobalt oxide prepared from a phthalocyanine metal precursor. Cobalt phthalocyanine (CoPc) films with different thicknesses were deposited by thermal evaporation on different substrates. The films were annealed at 400 °C in air to form a material with the cobalt oxide phase. The final Co oxide catalysts exhibit high transparency after thermal treatment. Their OER measurements demonstrate well expected mass activity for OER. Thermally evaporated and treated transition metal oxide nanoparticles are attractive for the functionalization of (photo)anodes for water oxidation.
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Affiliation(s)
- Ahmed Ziani
- KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Tatsuya Shinagawa
- KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Liga Stegenburga
- KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
| | - Kazuhiro Takanabe
- KAUST Catalysis Center (KCC) and Physical Sciences and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia
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24
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Nurlaela E, Wang H, Shinagawa T, Flanagan S, Ould-Chikh S, Qureshi M, Mics Z, Sautet P, Le Bahers T, Cánovas E, Bonn M, Takanabe K. Enhanced Kinetics of Hole Transfer and Electrocatalysis during Photocatalytic Oxygen Evolution by Cocatalyst Tuning. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00508] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Ela Nurlaela
- Division
of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Hai Wang
- Department
of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Graduate
School of Material Science in Mainz, University of Mainz, Staudingerweg
9, 55128 Mainz, Germany
| | - Tatsuya Shinagawa
- Division
of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Sean Flanagan
- Division
of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Samy Ould-Chikh
- Division
of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Muhammad Qureshi
- Division
of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
| | - Zoltán Mics
- Department
of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Philippe Sautet
- Université de Lyon, Université Claude Bernard Lyon 1, ENS Lyon, Centre Nationale de Recherche Scientifique, 46 allée d’Italie, 69007 Lyon Cedex 07, France
| | - Tangui Le Bahers
- Université de Lyon, Université Claude Bernard Lyon 1, ENS Lyon, Centre Nationale de Recherche Scientifique, 46 allée d’Italie, 69007 Lyon Cedex 07, France
| | - Enrique Cánovas
- Department
of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Mischa Bonn
- Department
of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Kazuhiro Takanabe
- Division
of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
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25
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Kageshima Y, Shinagawa T, Kuwata T, Nakata J, Minegishi T, Takanabe K, Domen K. A miniature solar device for overall water splitting consisting of series-connected spherical silicon solar cells. Sci Rep 2016; 6:24633. [PMID: 27087266 PMCID: PMC4834539 DOI: 10.1038/srep24633] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Accepted: 03/30/2016] [Indexed: 01/25/2023] Open
Abstract
A novel “photovoltaics (PV) + electrolyzer” concept is presented using a simple, small, and completely stand-alone non-biased device for solar-driven overall water splitting. Three or four spherical-shaped p-n junction silicon balls were successfully connected in series, named “SPHELAR.” SPHELAR possessed small projected areas of 0.20 (3PVs) and 0.26 cm2 (4PVs) and exhibited working voltages sufficient for water electrolysis. Impacts of the configuration on the PV module performance were carefully analyzed, revealing that a drastic increase in the photocurrent (≈20%) was attained by the effective utilization of a reflective sheet. Separate investigations on the electrocatalyst performance showed that non-noble metal based materials with reasonably small sizes (<0.80 cm2) exhibited substantial currents at the PV working voltage. By combining the observations of the PV characteristics, light management and electrocatalyst performance, solar-driven overall water splitting was readily achieved, reaching solar-to-hydrogen efficiencies of 7.4% (3PVs) and 6.4% (4PVs).
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Affiliation(s)
- Yosuke Kageshima
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Tatsuya Shinagawa
- Division of Physical Science and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| | - Takaaki Kuwata
- Kyosemi Corporation, 949-2 Ebisu-cho, Fushimi-ku, Kyoto, 612-8201, Japan
| | - Josuke Nakata
- Kyosemi Corporation, 949-2 Ebisu-cho, Fushimi-ku, Kyoto, 612-8201, Japan
| | - Tsutomu Minegishi
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Kazuhiro Takanabe
- Division of Physical Science and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| | - Kazunari Domen
- Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
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26
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Nurlaela E, Shinagawa T, Qureshi M, Dhawale DS, Takanabe K. Temperature Dependence of Electrocatalytic and Photocatalytic Oxygen Evolution Reaction Rates Using NiFe Oxide. ACS Catal 2016. [DOI: 10.1021/acscatal.5b02804] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ela Nurlaela
- King Abdullah University of Science and Technology (KAUST), KAUST
Catalysis Center (KCC), Physical Sciences and Engineering Division
(PSE), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| | - Tatsuya Shinagawa
- King Abdullah University of Science and Technology (KAUST), KAUST
Catalysis Center (KCC), Physical Sciences and Engineering Division
(PSE), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| | - Muhammad Qureshi
- King Abdullah University of Science and Technology (KAUST), KAUST
Catalysis Center (KCC), Physical Sciences and Engineering Division
(PSE), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| | - Dattatray S. Dhawale
- King Abdullah University of Science and Technology (KAUST), KAUST
Catalysis Center (KCC), Physical Sciences and Engineering Division
(PSE), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| | - Kazuhiro Takanabe
- King Abdullah University of Science and Technology (KAUST), KAUST
Catalysis Center (KCC), Physical Sciences and Engineering Division
(PSE), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
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Shinagawa T, Garcia-Esparza AT, Takanabe K. Insight on Tafel slopes from a microkinetic analysis of aqueous electrocatalysis for energy conversion. Sci Rep 2015; 5:13801. [PMID: 26348156 PMCID: PMC4642571 DOI: 10.1038/srep13801] [Citation(s) in RCA: 936] [Impact Index Per Article: 104.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 08/06/2015] [Indexed: 01/20/2023] Open
Abstract
Microkinetic analyses of aqueous electrochemistry involving gaseous H2 or O2, i.e., hydrogen evolution reaction (HER), hydrogen oxidation reaction (HOR), oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), are revisited. The Tafel slopes used to evaluate the rate determining steps generally assume extreme coverage of the adsorbed species (θ≈0 or ≈1), although, in practice, the slopes are coverage-dependent. We conducted detailed kinetic analyses describing the coverage-dependent Tafel slopes for the aforementioned reactions. Our careful analyses provide a general benchmark for experimentally observed Tafel slopes that can be assigned to specific rate determining steps. The Tafel analysis is a powerful tool for discussing the rate determining steps involved in electrocatalysis, but our study also demonstrated that overly simplified assumptions led to an inaccurate description of the surface electrocatalysis. Additionally, in many studies, Tafel analyses have been performed in conjunction with the Butler-Volmer equation, where its applicability regarding only electron transfer kinetics is often overlooked. Based on the derived kinetic description of the HER/HOR as an example, the limitation of Butler-Volmer expression in electrocatalysis is also discussed in this report.
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Affiliation(s)
- Tatsuya Shinagawa
- Division of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| | - Angel T. Garcia-Esparza
- Division of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
| | - Kazuhiro Takanabe
- Division of Physical Sciences and Engineering, KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 4700 KAUST, Thuwal, 23955-6900, Saudi Arabia
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Shinagawa T, Takanabe K. Identification of intrinsic catalytic activity for electrochemical reduction of water molecules to generate hydrogen. Phys Chem Chem Phys 2015; 17:15111-4. [DOI: 10.1039/c5cp02330k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Addition of foreign metal onto platinum nearly doubles its reactivity toward water molecule reduction under unbuffered neutral pH conditions.
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Affiliation(s)
- Tatsuya Shinagawa
- Division of Physical Sciences and Engineering
- KAUST Catalysis Center (KCC)
- King Abdullah University of Science and Technology (KAUST)
- Thuwal
- Saudi Arabia
| | - Kazuhiro Takanabe
- Division of Physical Sciences and Engineering
- KAUST Catalysis Center (KCC)
- King Abdullah University of Science and Technology (KAUST)
- Thuwal
- Saudi Arabia
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Shinagawa T, Garcia-Esparza AT, Takanabe K. Mechanistic Switching by Hydronium Ion Activity for Hydrogen Evolution and Oxidation over Polycrystalline Platinum Disk and Platinum/Carbon Electrodes. ChemElectroChem 2014. [DOI: 10.1002/celc.201402085] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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30
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Kumagai H, Tanaka Y, Murata M, Masuda Y, Shinagawa T. Novel TiO(2)/ZnO multilayer mirrors at 'water-window' wavelengths fabricated by atomic layer epitaxy. J Phys Condens Matter 2010; 22:474008. [PMID: 21386615 DOI: 10.1088/0953-8984/22/47/474008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We propose that novel oxide superlattice structures of crystalline TiO(2)/ZnO on sapphire substrates can be used for multilayer mirrors with high reflectivity at 2.734 nm. In the experimental study, both rutile TiO(2)(200) and wurtzite ZnO(001) thin films were grown epitaxially on the same sapphire (001) substrate by atomic layer epitaxy (ALE) at 450 °C. We also demonstrated that the novel oxide superlattice structure of 10-bilayer TiO(2)/ZnO on a sapphire substrate gave a high reflectivity of 29.4% at 2.74 nm.
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Affiliation(s)
- H Kumagai
- Faculty of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka-shi, Osaka 558-8585, Japan
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31
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Maekawa T, Sano Y, Shinagawa T, Rahman Z, Sakuma T, Nomura S, Licht JD, Ishii S. ATF-2 controls transcription of Maspin and GADD45α genes independently from p53 to suppress mammary tumors. Oncogene 2007; 27:1045-54. [PMID: 17700520 DOI: 10.1038/sj.onc.1210727] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The activating transcription factor, ATF-2, is a target of p38 and JNK that are involved in stress-induced apoptosis. Heterozygous Atf-2 mutant (Atf-2+/-) mice are highly prone to mammary tumors. The apoptosis-regulated gene GADD45alpha and the breast cancer suppressor gene Maspin, both of which are known to be p53 target genes, are downregulated in the mammary tumors arisen in Atf-2+/- mice. Here, we have analysed how ATF-2 controls the transcription of GADD45alpha and Maspin. ATF-2 and p53 independently activate the GADD45alpha transcription. ATF-2 does not directly bind to the GADD45alpha promoter; instead, it is recruited via Oct-1 and NF-I. ATF-2 simultaneously binds to Oct-1, NF-I and breast cancer suppressor BRCA1 to activate transcription. With regard to Maspin, ATF-2 and p53 directly bind to different sites in the Maspin promoter to independently activate its transcription. Consistent with the observation that ATF-2 and p53 independently activate the transcription of Maspin and GADD45alpha is that the loss of one copy of p53 shortened the period required for mammary tumor development in Atf-2+/- mice. These studies suggest the functional link between the ATF-2 and the two tumor suppressors BRCA1 and p53.
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MESH Headings
- Activating Transcription Factor 2/deficiency
- Activating Transcription Factor 2/genetics
- Activating Transcription Factor 2/physiology
- Animals
- BRCA1 Protein/physiology
- Cell Cycle Proteins/biosynthesis
- Cell Cycle Proteins/genetics
- Cell Line
- Cell Line, Tumor
- Female
- Gene Expression Regulation, Neoplastic/physiology
- Genes, Tumor Suppressor/physiology
- Humans
- Male
- Mammary Neoplasms, Experimental/enzymology
- Mammary Neoplasms, Experimental/genetics
- Mammary Neoplasms, Experimental/metabolism
- Mammary Neoplasms, Experimental/prevention & control
- Mice
- Mice, Inbred C57BL
- Mice, Inbred CBA
- Mice, Knockout
- Mice, Mutant Strains
- Nuclear Proteins/biosynthesis
- Nuclear Proteins/genetics
- Serpins/biosynthesis
- Serpins/genetics
- Tumor Suppressor Protein p53/physiology
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Affiliation(s)
- T Maekawa
- Laboratory of Molecular Genetics, RIKEN Tsukuba Institute, Koyadai, Tsukuba, Ibaraki, Japan.
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32
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Ishiguro H, Yasuda Y, Tomita Y, Shinagawa T, Shimizu T, Morimoto T, Hattori K, Matsumoto M, Inoue H, Yabe H, Yabe M, Shinohara O, Kato S. Gonadal shielding to irradiation is effective in protecting testicular growth and function in long-term survivors of bone marrow transplantation during childhood or adolescence. Bone Marrow Transplant 2007; 39:483-90. [PMID: 17334386 DOI: 10.1038/sj.bmt.1705612] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
An increasing number of long-term surviving bone marrow transplantation (BMT) recipients have recovered from their primary disease but are at risk of developing failure of endocrine organs. We investigated 30 recipients who underwent allogeneic BMT during childhood or adolescence. Testicular growth and function were evaluated by serial measurement of testicular volume, basal luteinizing hormone (LH), basal follicle-stimulating hormone (FSH) and testosterone levels and by gonadotropin-releasing hormone (GnRH) provocative test. Puberty started spontaneously in all patients. However, all except four patients had normal testosterone levels with elevated LH, indicating partial Leydig cell dysfunction. Standard deviation scores of testicular volume at last evaluation were statistically lower in those who had received irradiation without gonadal shield compared to those with (-2.04+/-0.45 vs -0.30+/-1.17, respectively, P<0.005), suggesting damage of testicular germinal epithelium owing to gonadal irradiation. Serial measurement of testicular volume showed a tendency of growth to stop at 10 ml in those without gonadal shield. Among the 30 patients, only one patient has fathered a child after reaching spontaneous puberty. These results suggest that gonadal shield is effective to protect testicular growth and function, although the attainment of fertility is difficult to achieve.
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Affiliation(s)
- H Ishiguro
- Department of Pediatrics, Tokai University School of Medicine, Kanagawa, Japan.
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Abstract
Using a cell culture method, we histochemically and immunohistochemically investigated whether chondrocytes deriving from different origins, such as Meckel's or costal cartilages, express similar phenotypic characteristics. Chondrocytes isolated enzymatically from Meckel's and costal cartilages of 17-day embryonic mice both actively proliferated and formed cartilage nodules consisting of toluidine blue-positive proteoglycans and type II collagen. Both deposited calcified cartilaginous matrix as revealed by alkaline phosphatase (ALPase) activity and alizarin red staining throughout 3 weeks in culture. Immunostaining for osteopontin (OP), osteocalcin (OC), and osteonectin (ON) revealed that chondrocytes from both cartilages were positive for their proteins, but type I collagen was detected only in cells transforming from Meckel's chondrocytes late in the culture. Electron microscopy demonstrated that although costal and Meckel's chondrocytes had typical chondrocytic features during 2 weeks in culture, Meckel's chondrocytes transformed into osteocytic cells that produced thick, banded type I collagen fibrils. In contrast, costal chondrocytes maintained typical hypertrophic morphology throughout the final stage of culture. The present study suggests that Meckel's chondrocytes derived from neural crest-ectomesenchyme retain osteogenic potential, and differ from costal chondrocytes originating from mesoderm.
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Affiliation(s)
- K Ishizeki
- Department of Oral Anatomy, School of Dentistry, Iwate Medical University, Morioka 020-8505, Japan.
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Shinagawa T, Suzuki S, Sawa R, Yoneyama Y, Asakura H, Araki T. Maternal plasma adenosine and endothelin-1 levels in twin gestation complicated by preeclampsia. Arch Gynecol Obstet 2002; 267:72-5. [PMID: 12439550 DOI: 10.1007/s00404-001-0283-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The aim of this study was to evaluate the relationship between the vascular resistance in uterine arteries and the maternal release of adenosine and endothelin-1 in twin gestations with and without preeclampsia. Uterine artery Doppler velocimetry and maternal arterial blood sampling were performed in 14 women with normal singleton gestation, nine women with singleton gestation with preeclampsia, eight women with dichorionic twin gestation without preeclampsia and six women with dichorionic twin gestation with preeclampsia at 28-34 weeks' gestation. In normal singleton gestations, the average maternal uterine arteries pulsatility index (PI), plasma adenosine and endothelin-1 levels were 0.64+/-0.07, 0.34+/-0.11 micromol/l and 1.29+/-0.31 pg/ml, respectively. In preeclamptic singleton gestations, increased vascular resistance in the uterine arteries (PI: 0.85+/-0.14, P<0.05) and the elevation of maternal arterial plasma adenosine (0.48+/-0.14 micromol/l, P<0.05) and endothelin-1 levels (1.91+/-0.55 pg/ml, P<0.05) were observed. In the normal twin gestation group, the average maternal vascular resistance of the uterine arteries (PI: 0.55+/-0.09) was lower than that in the normal singleton gestation group, while the average plasma adenosine levels (0.47+/-0.12 micromol/l) were higher than that in normal singleton gestation. On the other hand, significant increased plasma endothelin-1 concentrations (1.87+/-0.42 pg/ml) were observed in the preeclamptic twin gestation groups without changes in plasma adenosine levels or vascular resistance of uterine arteries. Our results indicate the presence of different mechanisms for the pathogenesis of preeclampsia between twin and singleton gestations.
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Affiliation(s)
- T Shinagawa
- Department of Obstetrics and Gynecology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113, Japan
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Shinagawa T, Nomura T, Colmenares C, Ohira M, Nakagawara A, Ishii S. Increased susceptibility to tumorigenesis of ski-deficient heterozygous mice. Oncogene 2001; 20:8100-8. [PMID: 11781823 DOI: 10.1038/sj.onc.1204987] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2001] [Revised: 09/12/2001] [Accepted: 09/18/2001] [Indexed: 01/07/2023]
Abstract
The c-ski proto-oncogene product (c-Ski) acts as a co-repressor and binds to other co-repressors N-CoR/SMRT and mSin3A which form a complex with histone deacetylase (HDAC). c-Ski mediates the transcriptional repression by a number of repressors, including nuclear hormone receptors and Mad. c-Ski also directly binds to, and recruits the HDAC complex to Smads, leading to inhibition of tumor growth factor-beta (TGF-beta) signaling. This is consistent with the function of ski as an oncogene. Here we show that loss of one copy of c-ski increases susceptibility to tumorigenesis in mice. When challenged with a chemical carcinogen, c-ski heterozygous mice showed an increased level of tumor formation relative to wild-type mice. In addition, c-ski-deficient mouse embryonic fibroblasts (MEFs) had increased proliferative capacity, whereas overexpression of c-Ski suppressed the proliferation. Furthermore, the introduction of activated Ki-ras into c-ski-deficient MEFs resulted in neoplastic transformation. These findings demonstrate that c-ski acts as a tumor suppressor in some types of cells. The level of cdc25A mRNA, which is down regulated by two tumor suppressor gene products, Rb and Mad, was upregulated in c-ski-deficient MEFs, whereas it decreased by overexpressing c-Ski in MEFs. This is consistent with the fact that c-Ski acts as a co-repressor of Mad and Rb. These results support the view that the decreased activities of Mad and Rb in ski-deficient cells at least partly contribute to enhanced proliferation and susceptibility to tumorigenesis. Human c-ski gene was mapped to a region close to the p73 tumor suppressor gene at the 1p36.3 locus, which is already known to contain multiple uncharacterized tumor suppressor genes.
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Affiliation(s)
- T Shinagawa
- Laboratory of Molecular Genetics, RIKEN Tsukuba Institute, and CREST (Core Research for Evolutionary Science and Technology) Research Project of JST (Japan Science & Technology Corporation), 3-1-1 Koyadai, Tsukuba, Ibaraki 305-0074, Japan
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36
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Hara K, Watanabe A, Kumon H, Shinagawa T, Inoue M, Ubukata K, Goto N. [Forum of carbapenem antibiotics(discussion)]. Jpn J Antibiot 2001; 54:541-64. [PMID: 11828601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
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37
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Kokura K, Kaul SC, Wadhwa R, Nomura T, Khan MM, Shinagawa T, Yasukawa T, Colmenares C, Ishii S. The Ski protein family is required for MeCP2-mediated transcriptional repression. J Biol Chem 2001; 276:34115-21. [PMID: 11441023 DOI: 10.1074/jbc.m105747200] [Citation(s) in RCA: 167] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
DNA methylation is essential for development in the mouse and plays an important role in inactivation of the X chromosome and genomic imprinting. MeCP2 is the founder member of a family of methyl-CpG-binding proteins. MeCP2 directly binds to the co-repressor mSin3, which interacts with class I histone deacetylase, recruiting them to methyl-CpG regions to suppress transcription. Here, we report that MeCP2 directly binds to two co-repressors, c-Ski and N-CoR, in addition to mSin3A, and that the c-Ski, which is encoded by the c-ski proto-onocogene, is required for MeCP2-mediated transcriptional repression. The two regions of c-Ski, including the C-terminal coiled-coil region, interact with the transcriptional repression domain in the center of the MeCP2 molecule. The immunostaining signals for c-Ski and MeCP2 overlap in the nuclear heterochromatin region, suggesting the co-localization of the two proteins. The degree of transcriptional repression mediated by a Gal4-MeCP2 fusion protein was abrogated by overexpression of the putative dominant negative form of c-Ski. Furthermore, injection of antibodies against c-Ski and Sno almost completely abolished the transcriptional repression mediated by the Gal4-MeCP2 fusion protein. These results suggest that the ski gene family is involved in methyl CpG-mediated transcriptional repression.
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Affiliation(s)
- K Kokura
- Laboratory of Molecular Genetics, RIKEN Tsukuba Institute, Ibaraki 305-0074, Japan
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38
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Ogoshi S, Nishida T, Shinagawa T, Kurosawa H. Key process in palladium-catalyzed asymmetric transformation of propargyl electrophiles. Racemization of optically active eta1-allenylpalladium(II). J Am Chem Soc 2001; 123:7164-5. [PMID: 11459499 DOI: 10.1021/ja010583s] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S Ogoshi
- Department of Applied Chemistry, Faculty of Engineering Osaka University, Suita, Osaka 565-0871, Japan
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Khan MM, Nomura T, Kim H, Kaul SC, Wadhwa R, Shinagawa T, Ichikawa-Iwata E, Zhong S, Pandolfi PP, Ishii S. Role of PML and PML-RARalpha in Mad-mediated transcriptional repression. Mol Cell 2001; 7:1233-43. [PMID: 11430826 DOI: 10.1016/s1097-2765(01)00257-x] [Citation(s) in RCA: 110] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Fusion of the promyelocytic leukemia (PML) protein to the retinoic acid receptor-alpha (RARalpha) generates the transforming protein of acute promyelocytic leukemias. PML appears to be involved in multiple functions, including apoptosis and transcriptional activation by RAR, whereas PML-RARalpha blocks these functions of PML. However, the mechanisms of leukemogenesis by PML-RARalpha remain elusive. Here we show that PML interacts with multiple corepressors (c-Ski, N-CoR, and mSin3A) and histone deacetylase 1, and that this interaction is required for transcriptional repression mediated by the tumor suppressor Mad. PML-RARalpha has the two corepressor-interacting sites and inhibits Mad-mediated repression, suggesting that aberrant binding of PML-RARalpha to the corepressor complexes may lead to abrogation of the corepressor function. These mechanisms may contribute to events leading to leukemogenesis.
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Affiliation(s)
- M M Khan
- Laboratory of Molecular Genetics, RIKEN Tsukuba Institute, 305-0074, Ibaraki, Japan
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Ogoshi S, Nishida T, Tsutsumi K, Ooi M, Shinagawa T, Akasaka T, Yamane M, Kurosawa H. Carbon-carbon bond formation by electrophilic addition at the central carbon of the mu-eta(3)-allenyl/propargyl ligand on the Pd-Pd bond. J Am Chem Soc 2001; 123:3223-8. [PMID: 11457056 DOI: 10.1021/ja003754m] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The mu-eta(3)-allenyl/propargyldipalladium complexes were synthesized by the reaction of the corresponding eta(1)-allenyl- or eta(1)-propargylpalladium complexes with Pd(2)(dba)(3). The X-ray diffraction analysis indicates that the dinuclear complex has a unique structure, in which two palladium, three carbon, two phosphorus, and one halogen atoms are in the same plane. These dinuclear complexes react with electrophiles, such as HCl or AcCl, at the central carbon of the mu-eta(3)-allenyl/propargyl ligand to give the mu-eta(3)-vinylcarbenedipalladium complexes. Intramolecular reaction proceeded smoothly to give cyclization products quantitatively. Addition of a catalytic amount of a palladium(0) complex dramatically accelerated the carbon-carbon bond formation. The MO calculations on the mu-eta(3)-allenyl/propargyl complexes indicated that the reaction proceeds via orbital control.
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Affiliation(s)
- S Ogoshi
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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41
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Shinagawa T, Tomita Y, Ishiguro H, Matsumoto M, Shimizu T, Yasuda Y, Hattori K, Kubota C, Yabe H, Yabe M, Kato S, Shinohara O. Final height and growth hormone secretion after bone marrow transplantation in children. Endocr J 2001; 48:133-8. [PMID: 11456258 DOI: 10.1507/endocrj.48.133] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Growth hormone (GH) deficiency has been regarded as a principal determinant for growth failure following bone marrow transplantation (BMT). We herein analyzed final height and GH secretion in the patients who received BMT during childhood. The study on final height in 30 patients (23 males; 19 with malignant disease) who underwent BMT before or at the onset of puberty showed the following findings: (1) Final height SD score (SDS) significantly decreased compared to pretreatment height SDS. (2) Patients who underwent BMT before the age of 10 years showed significantly greater reduction in height SDS compared to those who received after the age of 10 years. (3) The type of disease or a difference in preconditioning regimen did not influence the outcome of growth. (4) No patient showed GH deficiency. The study on GH secretion included 71 patients who had been followed for more than 5 years and who underwent insulin tolerance test more than twice following BMT. Thirteen patients experienced poor GH response at least once. Two of these patients had poor GH response repeatedly. In conclusion, children who undergo BMT at younger age have a higher risk of growth failure, and GH deficiency is not a major contributing factor for growth impairment following BMT.
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Affiliation(s)
- T Shinagawa
- Department of Pediatrics, Tokai University School of Medicine, Bohseidai, Kanagawa, Japan
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Kuwayama F, Hamasaki Y, Shinagawa T, Kubota C, Ichikawa I, Kato Y, Oi S, Shinohara O. Moyamoya disease complicated with renal artery stenosis and nephrotic syndrome: reversal of nephrotic syndrome after nephrectomy. J Pediatr 2001; 138:418-20. [PMID: 11241054 DOI: 10.1067/mpd.2001.111330] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A 7-year-old boy with moyamoya disease developed sustained hypertension, nephrotic syndrome, hyperreninemia, and occlusion of the right renal artery. After right nephrectomy, hyperreninemia and hypertension improved. Proteinuria was resolved after nephrectomy, in parallel with the decrease in plasma renin activity. Moyamoya disease can cause nephrotic-range proteinuria, which is caused hemodynamically by hyperreninemia.
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Affiliation(s)
- F Kuwayama
- Department of Pediatrics, Tokai University School of Medicine, Kanagawa, Japan
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Abstract
Familial male-limited precocious puberty (FMPP) is a rare disease caused by constitutively activating mutations in the luteinizing hormone receptor (LH-R) gene. In the present study, we analyzed the LH-R gene in members of a Japanese FMPP family. Two males of the family were affected and had a heterozygous M398T mutation; one patient developed pubertal signs as early as 2 years of age, and the other at 6 years of age. Both patients had elevated serum testosterone levels and prepubertal gonadotropin secretions. The father of the latter patient carried the M398T mutation, but lacked history of precocious puberty. Thus, phenotypic differences were observed in the three males with the same LH-R mutation belonging to the same family. In summary, we have described a Japanese family with FMPP.
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Affiliation(s)
- T Shinagawa
- Department of Endocrinology and Metabolism, National Children's Medical Research Center, Tokyo, Japan
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Abstract
BACKGROUND Small bowel obstruction in early pregnancy increases maternal and fetal morbidity and mortality and might be diagnosed mistakenly as hyperemesis gravidrum. Prompt diagnosis and therapy is essential. CASE A 29-year-old primigravida was admitted at 13 weeks' gestation with small bowel obstruction. After jejunotomy, total parenteral nutrition was given until oral intake was resumed completely 1 month after surgery. She was discharged with no complications and the rest of her pregnancy and delivery were uneventful. CONCLUSION Small bowel obstruction in early pregnancy should be diagnosed expeditiously and can be treated with jejunotomy and total parenteral nutrition.
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Affiliation(s)
- S Watanabe
- Department of Obstetrics and Gynecology, Omiya Chuo Sogo Hospital, Saitama, Japan.
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Shinagawa T, Dong HD, Xu M, Maekawa T, Ishii S. The sno gene, which encodes a component of the histone deacetylase complex, acts as a tumor suppressor in mice. EMBO J 2000; 19:2280-91. [PMID: 10811619 PMCID: PMC384369 DOI: 10.1093/emboj/19.10.2280] [Citation(s) in RCA: 86] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The Ski and Sno oncoproteins are components of a macromolecular complex containing the co-repressor N-CoR/SMRT, mSin3 and histone deacetylase. This complex has been implicated in the transcriptional repression exerted by a number of repressors including nuclear hormone receptors and Mad. Further more, Ski and Sno negatively regulate transforming growth factor-beta (TGF-beta) signaling by recruiting this complex to Smads. Here we show that loss of one copy of sno increases susceptibility to tumorigenesis in mice. Mice lacking sno died at an early stage of embryogenesis, and sno was required for blastocyst formation. Heterozygous (sno(+/-)) mice developed spontaneous lymphomas at a low frequency and showed an increased level of tumor formation relative to wild-type mice when challenged with a chemical carcinogen. sno(+/-) embryonic fibroblasts had an increased proliferative capacity and the introduction of activated Ki-ras into these cells resulted in neoplastic transformation. The B cells, T cells and embryonic fibroblasts of sno(+/-) mice had a decreased sensitivity to apoptosis or cell cycle arrest. These findings demonstrate that sno acts as a tumor suppressor at least in some types of cells.
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Affiliation(s)
- T Shinagawa
- Laboratory of Molecular Genetics, RIKEN Tsukuba Life Sciences Center, 3-1-1 Koyadai, Tsukuba, Ibaraki 305-0074, Japa
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Shima M, Tanae A, Miki K, Katsumata N, Matsumoto S, Nakajima S, Harada T, Shinagawa T, Tanaka T, Okada S. Mechanism for the development of ovarian cysts in patients with congenital lipoid adrenal hyperplasia. Eur J Endocrinol 2000; 142:274-9. [PMID: 10700722 DOI: 10.1530/eje.0.1420274] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE Although ovarian cysts commonly occur in patients with congenital lipoid adrenal hyperplasia (CLAH), the mechanism of development remains to be determined. To clarify the pathogenesis of the ovarian cysts, endocrinological examinations were performed in patients with CLAH. METHODS The subjects were three Japanese CLAH patients. Basal body temperature, serum and urinary gonadotropin levels, serum and/or urinary ovarian hormones and mutations of the steroidogenic acute regulatory protein (StAR) gene were examined. RESULTS The basal body temperature was not biphasic in any patient. Basal LH levels were high in all CLAH patients and markedly responded to LH-releasing hormone in two patients. Urinary gonadotropin analysis revealed repetitive LH surges in the menstrual cycles of the CLAH patients. No increase in the urinary pregnanediol suggested anovulation in all patients, and bilateral ovarian cysts were found in two of the subjects. Examination of the StAR gene revealed a frameshift mutation 840delA at codon 238, a nonsense mutation Q258X at codon 258, a homozygotic mutation at Q258X, and a compound heterozygotic mutation with 251insG and Q258X. CONCLUSIONS We concluded that the development of ovarian cysts may be derived from continued anovulation in CLAH patients. Elevated LH levels may be explained by increased sensitivity of the anterior pituitary to circulating estrogen.
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Affiliation(s)
- M Shima
- Department of Pediatrics, Osaka University, Faculty of Medicine, Yamadaoka, Suita City, Osaka 565-0871, Japan
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Imanishi Y, Ehara N, Shinagawa T, Tsujino D, Endoh I, Baba K, Kanemaki Y, Iida S, Hayakawa M, Miyazaki O, Shirakawa K, Nosaka S. Correlation of CT values, iodine concentration, and histological changes in the thyroid. J Comput Assist Tomogr 2000; 24:322-6. [PMID: 10752901 DOI: 10.1097/00004728-200003000-00026] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE We have reported that in the thyroid, there is a linear correlation between iodine concentrations and CT values. However, the slope of the regression line was about three times as large as that in KI solutions. We investigated the factor(s) contributing to the increment of the slope of the regression line in the thyroid. METHOD Solutions of NH4I and thyroid hormones were used to investigate the regression line. Thirty-six thyroids were evaluated to investigate the correlation between the iodine concentrations and the area ratio of thyroid follicles, which were measured by preoperative CT and from tissue slices, respectively. RESULTS The slopes of the regression lines in the solutions were almost identical to those in KI solutions. In the thyroid, iodine concentrations were logarithmically correlated with the area ratio of follicles. CONCLUSION The decrease in CT values not only revealed a decrease of iodine concentration in the thyroid but also represented an increase of follicular cells and/or interstitial structures in the volume ratio secondary to it.
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Affiliation(s)
- Y Imanishi
- Department of Radiology, St. Marianna University Yokohama Seibu Hospital, Japan
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Suga M, Mamada Y, Mizuno H, Tominaga T, Satou A, Suzuki H, Hagiwara M, Shinagawa T, Suzuki M. [A case of liver metastasis of the non-functioning islet cell tumor of the pancreas treated by percutaneous ethanol injection therapy]. Nihon Shokakibyo Gakkai Zasshi 1999; 96:1302-7. [PMID: 10586609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Affiliation(s)
- M Suga
- Department of Gastroenterology, St. Marianna University Yokohama City Seibu Hospital
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Abstract
Pregnancies complicated by placenta praevia and a history of caesarean section are associated with increased risk of placenta percreta (1). Placenta praevia percreta sometimes involves the bladder or other pelvic organ, invasion leading to genital bleeding or haematuria (2, 3). Bladder injury or uncontrollable profuse haemorrhage occasionally occurs in such patients during surgery. Examination of placental invasion is necessary as this clinical condition is severe. Treatment of placental myometrium invasion is required to prevent uncontrollable profuse haemorrhage during surgery. We present a multiparous patient who was diagnosed prenatally with placenta praevia percreta using magnetic resonance imaging (MRI) and who was treated conservatively with a good prognosis.
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Affiliation(s)
- Y Otsubo
- Department of Obstetrics and Gynaecology, Omiya Chuo Sogo Hospital, Omiya-shi, Saitama, Japan
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Tanaka K, Kanasugi K, Noda S, Shigeta H, Nakano S, Komoriyama H, Tanaka I, Ikezawa H, Hagiwara M, Shinagawa T. Clinicopathological evaluation of MR imaging of nonpalpable breast cancer with bloody nipple discharge. Eur J Cancer 1999. [DOI: 10.1016/s0959-8049(99)81222-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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