Design of Catalysts and Electrocatalysts for Energy Applications
讲座名称：
Design of Catalysts and Electrocatalysts for Energy Applications
讲座时间：
2012-10-16
讲座人：
陈经广
形式：
校区：
兴庆校区
实践学分：
讲座内容：
应化工学院化工系齐随涛副教授邀请，美国哥伦比亚大学化工系陈经广教授将于10月16日上午9:00在化工楼二楼会议室226进行学术讲座。
题目：Design of Catalysts and Electrocatalysts for Energy Applications
时间：2012年10月16日（星期二）上午9:00
地点：化工楼二楼会议室226
讲座摘要：
In the current talk we will use two examples to demonstrate the importance of using surface science studies to identify catalysts and electrocatalysts. Our research approaches involve parallel efforts in density functional theory (DFT) calculations, surface science experiments on model systems, and synthesis and evaluation of supported catalysts under thermochemical or electrochemical conditions. We will first use water electrolysis to demonstrate the feasibility of using monolayer Pt on tungsten carbide (WC) to achieve the same activity as bulk Pt. We will present DFT calculations of similar electronic and chemical properties between monolayer Pt/WC and Pt, synthesis and characterization of monolayer Pt/WC films, and electrochemical evaluation of the activity and stability of Pt/WC for water electrolysis. Comparing to the leading Pt electrocatalyst, the monolayer Pt/WC represents a reduction by a factor of ten in Pt loading [1-3].
We will then use the conversion of biomass-derived oxygenates to illustrate the advantages of using bimetallic catalysts. Bimetallic catalysts often show unique activity and selectivity over their parent metals due to the electronic modification and strain effect [4,5]. We will present our results on the characterization of Ni/Pt bimetallic surfaces and catalysts under in-situ reaction conditions, further highlighting the importance of using the combined approaches of DFT calculations, surface science experiments, and reactor evaluations [6,7].
[1] D.V. Esposito, S.T. Hunt, K.D. Dobson, B.E. McCandless, R.W. Birkmire and J.G. Chen, “Low-Cost Hydrogen Evolution Catalysts Based on Monolayer Platinum on Tungsten Monocarbide Substrates”, AngewandteChemie International Edition, 49 (2010) 9859-9862
[2] D.V. Esposito, S.T. Hunt, Y.C. Kimmel and J.G. Chen, “A New Class of Electrocatalysts for Hydrogen Production from Water Electrolysis: Metal Monolayers Supported on Low-Cost Transition Metal Carbides”, Journal of the American Chemical Society, 134 (2012) 3025-3033.
[3] T.G. Kelly and J.G. Chen, “Metal Overlayer on Metal Carbide Substrate: Unique Properties for Catalysis and Electrocatalysis”, Chemical Society Reviews, (2012) DOI: 10.1039/C2CS35165J.
[4] W. Yu, M.D. Porosoff and J.G. Chen, “Pt-based Bimetallic Catalysis: From Model Surfaces to Supported Catalysts”, Chemical Reviews, (2012) DOI: 10.1021/cr300096b.
[5] D.A. Hansgen, D.G. Vlachos and J.G. Chen, “Using First Principles to Predict Bimetallic Catalysts for the Ammonia Decomposition Reaction”, Nature Chemistry, 2 (2010) 484-489.
[6] M. Salciccioli, W. Yu, M.A. Barteau, J.G. Chen, D.G. Vlachos, “Differentiation of O-H and C-H Bond Scission Mechanisms of Ethylene Glycol on Pt and Ni/Pt Using Theory and Isotopic Labeling Experiments”, Journal of the American Chemical Society, 133 (2011) 7996-8004.
[7] W. Yu, M.A. Barteau and J.G. Chen, “Glycolaldehyde as a Probe Molecule for Biomass-derivatives: Reaction of C-OH and C=O Functional Groups on Monolayer Ni Surfaces”, Journal of the American Chemical Society, 133 (2011) 20528-20535.
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