报告题目：Engineering nanoparticlecatalyst surface for energy applications
报告人：Zhichuan Xu 教授
新加坡南洋理工大学材料科学与工程系
School of Materials Science and Engineering, NanyangTechnological University, 50 Nanyang Avenue, Singapore 639798)
报告地点：907-1319
报告时间：2016年6月4日上午9：30-10：30
Abstract The supply of renewable and cleanenergy is the most important scientific and technical challenge in 21stcentury. To meet the global energydemand in a sustainable fashion will require not only improved energy efficiencyand new methods of using existing carbon-based fuels but also a daunting amountof new carbon-neutral energy. To buildnew carbon-neutral energy systems, two key components must be technicallydeveloped: 1) new energy conversion system and 2) efficient energystorage. Now this effort is being madein a worldwide range by both nanoscience and electrochemistry communities. The synergistic combination of nanotechnologyand renewable energy technology has resulted in numerous of innovativeapproaches for discovering new energy materials, devices, and concepts. One ofthe most exciting prospects of nanotechnology is that nanoparticle catalystscan improve the efficiency of those critical reactions in the renewable energydevices with the lowered cost in materials.
Bimetallic nanoparticles with controlled size,composition, and structure are very interesting for energy conversion andstorage reactions. The ability to directbimetallic nanoparticle catalysts to express desirable surface morphology and compositionis a crucial step toward effective heterogeneous catalysis applications. Many developments on surface morphologycontrol of nanomaterials have been reported, including high frequencyelectrodeposition, multi-step growth, preferential faceting, and temperaturecontrolled synthesis. Surfacecomposition, on the other hand, has been challenging to manipulate, especiallyfor electrocatalysis, where precise control over surface composition isessential. In this seminar, engineeringnanoparticle surface for fuel cell and Li-air battery reactions will bediscussed. A colloidal synthesis methodfor making smooth Pt-shelled AuPt nanoparticles as well as the reactionmechanism will be discussed. The talkwill also introduce the methods for determining the Pt coverage and surfacecomposition. Furthermore, a method toprecisely control the surface composition of AuPt bimetallic nanoparticlesusing a surface energy manipulation strategy will be demonstrated. With these AuPt nanoparticle catalysts, asystemic study on the dependence of the methanol oxidation and CO oxidationactivities on the surface composition was able to be conducted. In addition,this presentation will also introduce some our recent works on transition metaloxide materials for electrocatalysis and batteries.
Biography Dr. Zhichuan Xu is currently anassistant professor in the School of Materials Science and Engineering atNanyang Technological University. Dr. Xu received his PhD training from LanzhouUniversity, Institute of Physics, CAS, and Brown University (2002-2008). HisPhD study focused on nanomaterials synthesis and characterizations. He workedin State University of New York at Binghamton as a Research Associate(2007-2009) and then he worked in Massachusetts Institute of Technology as aPostdoctoral Researcher (2009-2012). Dr. Xu's research interests includeelectrochemistry, catalysis, solar fuels, energy storage, magneticnanomaterials, and sensors.
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