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    Design of Metal Structures Encapsulated in N-doped Carbon Layers as Tunable Catalysts for Electrochemical Applications
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    Update time: 2017-03-31
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    Lecture: Design of Metal Structures Encapsulated in N-doped Carbon Layers as Tunable Catalysts for Electrochemical Applications 

    Lecturer: Prof. Takeo Ohsaka, Tokyo Institute of Technology  

    Time: 9:30 am, Mar 30, 2017 

    Location: Meeting Room 217 of Energy Building 

    Abstract 

    The identification and development of efficient catalysts made of non-precious materials for oxygen reduction reaction (ORR) are essential for the successful operation of a wide range of energy devices. In this presentationearth-abundant nanoparticles of transition metals encapsulated in a nitrogen-doped carbon shell(M@N-C,M = Fe, Co, Ni, Cu or Fe alloys) are proved to be the promising metal catalysts in acidic solutions. By density functional theory calculations and experimental validations, a method of tuning the ORR activity of Me@N-C are quantitatively proposed by controlling the nitrogen-doping level, the thickness of the N-C shells and binary alloying. FeCo@N-C/KB was chosen as the best ORR catalyst because of its onset and half-wave potentials of 0.92 and 0.74 V vs. a reversible hydrogen electrode (RHE), respectively, and its excellent durability. Furthermore, FeCo@N-C/KB possesses a high activity for the hydrogen evolution reaction (HER), thus demonstrating that a good bifunctional ORR and HER catalyst in acidic media. 

    Introduction of Lecturer:    

    Dr. Takeo Ohsaka is the professor of Tokyo Institute of Technology, the editorial director and vice-chairman of The Electrochemical Society of Japan, vice chairman of Kanto branch of the Chemical Society of Japan, a member of ISEECSECSJACS. Professor Ohsaka is an outstanding scientist in the field of cathode oxygen reduction (ORR) kinetics and catalysis, and he has published more than 400 SCI papers as the first or corresponding author in international top journals, such as JACS, Anal. Chem. etc. Other citations of his papers have achieved more than 13268 so far. The H-index of Professor Ohsaka is up to 60. Professor Ohsaka has made outstanding contributions to electrochemistry science and his work has a profound impact in this field.  

    Selected Publications: 

    1. F.C. Anson, T. Ohsaka, Kinetics of electron-transfer cross-reactions within redox polymers. Coatings of a protonated polylysine copolymer with incorporated electroactive anionsJ. Am. Chem. Soc., 105, 4883-4890(1983). 

    2. N. Oyama, T.Ohsaka, Electrode kinetics of (Fe(CN)64-/3-) and (Fe(CN)53-/2-) complexes confined to polymer film on graphite surfaces, J. Am. Chem. Soc., 105, 6003-6008(1983). 

    3. K. Liu, P. Yu, Y. Lin, Y. Wang, T. Ohsaka, L. Mao, Online Electrochemical Monitoring of Dynamic Change of Hippocampal Ascorbate: Toward a Plattform for In Vivo Evaluation of Antioxidant Neuroprotective Efficiency against Carebral Ischemia Injury, Anal. Chem., 85, 9947-9954 (2013). 

    4. M. R. Rahman, T. Okajima, T. Ohsaka, Selective detection of As(III) at the Au(111)-like polycrystalline gold electrode, Anal.Chem., 82, 9169-9176(2010). 

    5. J. F. Wu, Y. Che, T. Okajima, F. Matsumoto, K. Tokuda and T. Ohsaka. Hydrodynamic Chronocoulometric Determination of Diffusion Coefficients   and Concentrations of Dioxygen in Media of Quinoline, Isoquinoline and Methylquinolines, Anal. Chem., 1999, 71(18): 4056-4060 .  

    6. S. H. Noh, M. H. Seo, X. Ye, Y. Makinose, T. Okajima, N. Matsushita, B. Han, T. Ohsaka, Design of an Active and Durable Catalyst for Oxygen Reduction Reaction Using Encapsulated Cu with N-doped Carbon Shells (Cu@N-C) Activated by CO2 Treatment, J. Mater. Chem.A, 3, 22031-22034(2015). 

    7.C. R. Raj, A. Samanta, S. H. Noh, S. Mondel, T. Okajima, T. Ohsaka, Emerging new generation electrocatalysts for oxygen reduction reaction”, J. Mater. Chem.A, 4, 11156-11178 (2016). 

    8. S. H. Noh, B. Han, T. Ohsaka, First Principles Computational Study of Highly Stable and Active Ternary Pt CuNi Nanocatalyst for Oxygen Reduction Reaction, Nano Research, 8, 3374-3404(2015). 

    9. Y. Tian, L. Mao, T. Okajima, T. Ohsaka, A Carbon Fiber Microelectrode-based Third-generation Biosensor for Superoxide anion, Biosens.Bioelectron., 21, 557-564(2005). 

    10. J. Wu, D. Zhang, H. Niwa, Y. Harada, M. Oshima, H. Ofuchi, Y. Nabae, T. Okajima, T. Ohsaka,Enhancement in Kinetics of Oxygen Reduction Reaction on a Nitrogen-doped Carbon Catalyst by Introduction of Iron via Electrochemical Methods, Langmuir, 31, 5529-5536(2015). 

      

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