主讲人: Prof. Zhichuan J. Xu

时间: 2019年2月27日下午3:00

地点: beat365体育官网平台西丽校区B1-420会议室

报告人简介：

Zhichuanis an associate professor in School of Materials Science and Engineering,Nanyang Technological University. He received his PhD degree in ElectroanalyticalChemistry at 2008 and B.S. degree in Chemistry at 2002 from Lanzhou University,China. His PhD training was received in Lanzhou University (2002-2004),Institute of Physics, CAS (2004-2005), and Brown University (2005-2007). Since2007, he worked in State University of New York at Binghamton as a ResearchAssociate and from 2009 he worked in Massachusetts Institute of Technology as aPostdoctoral Researcher. Dr. Xu is member of International Society ofElectrochemistry (ISE), The Electrochemistry Society (ECS), and AmericanAssociation for the Advancement of Science (AAAS). He was awarded Fellow ofRoyal Society of Chemistry (FRSC) in Nov. 2017. He served as a guest editor forthe special issue ICEI2016 of Electrochimica Acta and an associate editor forNano-Micro Letters. He is also the development editor for Current Opinion inElectrochemistry and the vice president of ECS Singapore Section. Dr Xu is 2018Highly Cited Researcher by Clarivate Analytics, Web of Science.  

讲座摘要：

Exploringefficient and low cost oxygen electrocatalysts for ORR and OER is critical fordeveloping renewable energy technologies like fuel cells, metal-air batteries,and water electrolyzers. This presentation will presents a systematic study onoxygen electrocatalysis (ORR and OER) of transition metal spinel oxides.Starting with a model system of Mn-Co spinel, the presentation will introducethe correlation of oxygen catalytic activities of these oxides and theirintrinsic chemical properties. The catalytic activity was measured by rotatingdisk technique and the intrinsic chemical properties were probed by synchrotronX-ray absorption techniques. It was found that molecular orbital theory is ableto well-explain their activities. The attention was further extended from cubicMn-Co spinels to tetragonal Mn-Co spinels and it was found that the moleculartheory is again dominant in determining the catalytic activies. Thismechanistic principle is further applied to explain the ORR/OER activities ofother spinels containing other transition metals (Fe, Ni, Zn, Li, and etc.).The talk further gives insight on surface reconstruction on spinel oxides andhow the bulk properties affect such reconstruction during OER.

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