Design of Electrocatalyst for Oxygen Reduction and Evolution Reactions

报 告 人：Prof. Hong Yang

报告时间：2018年10月12日（星期五）下午14:00

报告地点：浦江楼302会议室

报告简介：

Electrochemical reactions for the reduction and evolution of oxygen are important for a range of sustainable energy technologies, most noticeably, hydrogen-powered fuel cell, electrolyzer for hydrogen generation through direct water splitting, and metal air battery. Among the best performing systems, low temperature polymer-based membrane electrodes in acidic media are preferable. Thus, there are strong incentive and high demand for producing cost-effective electrocatalysts that are highly active and stable in acidic media [1]. In this presentation, I will discuss our approaches to the design and realization of two major classes of oxygen electrode catalysts: platinum-alloy based low precious metal (PGM) oxygen reaction (ORR) [1-5] and oxygen evolution reaction (OER) catalysts [6-8]. For the low-PGM Pt-based ORR catalysts, I will focus on addressing the understanding the effect on design parameters on size, facet, composition and fine structures through controlling ligand chemistry and the use of in situ liquid transmission electron microscopy (LTEM) [3,4] and variable temperature environmental TEM (ETEM) [6] to understand the fundamentals and thus assist the design. For the high-performance OER catalysts, I will present oxygen-deficient perovskite and pyrochlore ternary oxide systems [6-8], including acid-stable pyrochlore Y2Ru2O7 catalysts [6]. Density functional theory (DFT) calculation has been used in understanding the observed high performance in activity and stability.

References:

1. Jianbo Wu, and Hong Yang,Acc. Chem. Res.,2013,46,1848–1857.

2. Xi Yin, Miao Shi, Jianbo Wu, Yung-Tin Pan, Danielle L. Gray, Jeffery A. Bertke, Hong Yang,Nano Lett.,2017,17, 6146-6150.

3. Jianbo Wu, Wenpei Gao, Hong Yang, Jian-Min Zuo, ACS Nano,2017,11,1696–1703.

4. Jianbo Wu, Wenpei Gao, Jianguo Wen, Dean J. Miller, Ping Lu, Jian-Min Zuo, Hong Yang,Nano Lett.,2015,15, 2711-2715.

5. Yung-Tin Pan, Jianbo Wu, Hong Yang,AIChE J,2016,62, 399-407.

6. Jaemin Kim,? Pei-Chieh Shih,? Kai-Chieh Tsao, Yung-Tin Pan, Xi Yin, Cheng-Jun Sun, Hong Yang,J. Am. Chem. Soc.,2017,139,2076-12083 (?: equal contribution).

7. Jaemin Kim, Xuxia Chen, Yung-Tin Pan, Pei-Chieh Shih, Hong Yang,J. Electrochem. Soc.,2017,164, F1074-F1080.

8. Jaemin Kim, Xi Yin, Kai-Chieh Tsao, Shaohua Fang, Hong Yang,J. Am. Chem. Soc.,2014,136, 14646-14649.

报告人简介：

Prof. Hong Yang is the Richard C. Alkire Chair in Chemical Engineering at the University of Illinois at Urbana-Champaign (UIUC). He received his B.Sc. degree from Tsinghua University (1989), M.Sc. degree from University of Victoria (1994), and Ph.D. degree from University of Toronto (1998, with Geoffrey A. Ozin) and did his postdoctoral research at Harvard University (with George M. Whitesides). He worked at University of Rochester for the first ten years of his academic career and then joined the faculty of UIUC as Full Professor in 2012. Among his awards and honors, Dr. Yang received one of the two NSERC Canada Doctoral Prizes in Science. He was an NSERC Postdoctoral Fellow, a US National Science Foundation CAREER Award winner, a Visiting Chair Professor with Shanghai Jiaotong University, and is an elected Fellow of American Association for the Advancement of Science (AAAS). He is a Section Editor forCurrent Opinion in Chemical Engineering, and serves on several Editorial Boards, includingNano Today,ChemNanoMat, Science China Materials,andFrontiers in Energy. He has given 170+ invited talks, including 29 plenary, keynote and name lectures. His research interests include formation of nanocrystals, catalysis, electrocatalysis, and applications of nanomaterials for energy and sustainability. His group currently work on multiple projects, such as, the development of low-PGM and non-PGM ORR catalysts, battery electrode materials, electrochemical-fixation of nitrogen, and CO₂utilization.

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