BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Memento EPFL// BEGIN:VEVENT SUMMARY:Aqueous Design & Electronic Structure Engineering of New Materials for Solar Energy Conversion DTSTART:20181221T110000 DTSTAMP:20260407T194938Z UID:73a1ad7570463eea6beccf5dc5e1042006d3639b658a8feffe55f3a8 CATEGORIES:Conferences - Seminars DESCRIPTION:Lionel Vayssieres\, International Research Center for Renewabl e Energy (IRCRE)\, Xi’an Jiaotong University\, Xi’an 710049\, China\nB io : Dr. Vayssieres got his high school diploma in Mathematics & Life Scie nces in 1986 (Academy of Grenoble) and moved to Paris to study at the Univ ersité Pierre et Marie Curie where he received a BSc. and MSc in Chemical Physics and a postgraduate diploma in Inorganic Chemistry in 1989\, 1990\ , and 1991 respectively as well as a PhD in Chemistry in 1995 for his rese arch work on the Interfacial & thermodynamic growth control of metal oxide nanoparticles in aqueous solutions. Thereafter\, he joined Uppsala Univer sity\, Sweden as a researcher for the Swedish Materials Consortium on Clus ters & Ultrafine Particles to extend his concepts and develop purpose-buil t metal oxide nanomaterials and study their electronic structure by x-ray spectroscopies at synchrotron facilities. He was a visiting scientist at: UT Austin\; UNESCO Centre for Macromolecules & Materials\, Stellenbosch Un iversity and iThemba LABS\, South Africa\; Glenn T. Seaborg Center\, Chemi cal Sciences Division\, at LBNL\; EPFL\, Switzerland and an independent sc ientist at the National Institute for Materials Science (NIMS)\, Japan. He has (co-)authored 100+ publications cited over 11700 times (5500+ since 2 013\, Google Scholar)\; Top 1% scientist in Materials Science. All-time 8 ESI highly cited papers (5 as first-author). He gave 400 lectures in 33 di fferent countries at international conferences\, universities\, government al and industrial institutes and acted as organizer\, chairman\, executive /advisory program committee member for major international projects worldw ide. Since 2012\, he’s a full time 1000-talent scholar Professor at Xi ’an Jiaotong University\, China\, co-founder and scientific director of IRCRE-International Research Center for Renewable Energy (440 articles\, 1 1200+ citations\, 18 ESI Highly Cited Papers since 2011) funded by the Nat ional Science Foundation of China. He is also\, since 2003\, the founding editor-in-chief of the International Journal of Nanotechnology\, a referee for 80 SCI journals as well as for major funding agencies in Americas\, E urope\, Asia\, and Africa and a guest scientist at CSD\, LBNL. He’s also the recipient of the 2014 Sanqin Friendship Award\, the 2016 National Chi nese Government Friendship Award\, one of the 2014\, 2015\, 2016\, and 201 7 most cited researchers in China in Materials Science (Scopus/Elsevier) a nd one of the 2016 Global Ambassador of the American Ceramic Society.\nAbs tract : The demand of low-cost and highly efficient materials has become a major challenge scientists are facing to answer crucial contemporary issu es such as clean alternative energy resources for a safer and cleaner envi ronment. One of the promising alternatives for the transition of fossil fu el-based energy to a clean and renewable one relies on the widespread impl ementation of solar energy conversion systems[1]\, yet the high cost of en ergy production and low-energy of currently used material combinations pos e an intrinsic limitation. In this context\, new materials development is required to achieve the necessary crucial increase in power generation and conversion efficiency. The necessity of materials development which is no t limited to materials that can achieve their theoretical limits\, but mak es it possible to raise these limits by changing the fundamental underlyin g physics and chemistry is critical. Low cost purpose-built materials with optimized structure and properties combined with inexpensive large scale manufacturing methods will play a decisive role in the success of renewabl e energy systems. However\, fabricating large areas of such materials is a daunting challenge.\nNovel smarter and cheaper fabrication techniques and \, just as important\, better fundamental knowledge and comprehensive unde rstanding of their properties using nanoscale phenomena such as quantum co nfinements to create multi-functional structures and devices is the key to success. Such concepts will be demonstrated by the thermodynamic modeling \, low-cost aqueous design and fabrication of highly oriented crystalline arrays of metal oxide quantum dots and rods-based structures and devices w ith controlled orientation\, size and shape onto various substrates design ed at multiple scales by aqueous chemical growth at low-temperature[2] alo ng with the in-depth study of their electronic structure and quantum confi nement effects performed at synchrotron radiation facilities[3] as well as their applications for sustainable solar energy conversion such as solar fuels[1].\n[1]X. Guan et al. Making of an industry-friendly artificial pho tosynthesis device\, ACS Energy Lett. 2018\, 3\, 2230\; X. Guan et al. Eff icient unassisted overall photocatalytic seawater splitting on GaN-based n anowire arrays\, J. Phys. Chem. C 2018\, 122\, 13797\; J. Su et al\, Stabi lity and performance of sulfide-\, nitride-\, phosphide-based electrodes f or photocatalytic solar water splitting\, J. Phys. Chem. Lett. 2017\, 8\, 5228\; A place in the sun for artificial photosynthesis? ACS Energy Lett. 2016\, 1\, 121\; Y. Tachibana et al. Artificial photosynthesis for solar w ater splitting\, Nat. Photon. 2012\, 6\, 511\; C.X. Kronawitter et al. A p erspective on solar-driven water splitting with all-oxide heteronanostruct ures\, Energy Environ. Sci. 2011\, 4\, 3889.\n[2]L.Vayssieres\, Growth of arrayed nanorods and nanowires of ZnO from aqueous solutions\, Adv. Mater. 2003\, 15\, 464\; Highly ordered SnO2 nanorod-arrays from controlled aque ous growth\, Angew. Chem. Int. Ed. 2004\, 43(28)\, 3666\; On the thermodyn amic stability of metal oxide nanoparticles in aqueous solutions\, Int. J. Nanotechnol. 2005\, 2\, 411\; On the effect of nanoparticle size on water -oxide interfacial chemistry\, J. Phys. Chem. C 2009\, 113\, 4733\; Y.Wei et al. Spontaneous photoelectric field-enhancement effect prompts the low cost hierarchical growth of highly ordered heteronanostructures for solar water splitting\, Nano Res. 2016\, 9\, 1561.\n[3]L.Vayssieres et al. Size effect on the conduction band orbital character of Anatase TiO2 nanocrysta ls\, Appl. Phys. Lett. 2011 99\, 183101\; 1D quantum-confinement effect in α-Fe2O3 ultrafine nanorod arrays\, Adv. Mater.\, 2005\, 17\, 2320\; J. E ngel et al. In-situ electrical characterization of Anatase TiO2 Q-dots\, A dv. Func. Mater. 2014\, 24\, 4952\; C.X. Kronawitter et al. TiO2–SnO2:F interfacial electronic structure investigated by soft x-ray absorption spe ctroscopy\, Phys. Rev. B 2012\, 85\, 125109\; Titanium incorporation into hematite photoelectrodes: Theoretical considerations and experimental obse rvations\, Energy Environ. Sci. 2014\, 7\, 3100\; Electron enrichment in 3 d transition metal oxide hetero-nanostructures\, Nano Lett. 2011\, 11\, 38 55\; On the interfacial electronic structure origin of efficiency enhancem ent in hematite photoanodes\, J. Phys. Chem. C 2012\, 116\, 22780\; On the orbital anisotropy in hematite nanorod-based photoanodes\, PCCP 2013\, 15 \, 13483\; M.G. Kibria et al. Atomic-scale origin of long-term stability a nd high performance of p-GaN nanowire arrays for photocatalytic overall pu re water splitting\, Adv. Mater. 2016\, 28\, 8388. LOCATION:MED 0 1418 https://plan.epfl.ch/?room==MED%200%201418 STATUS:CONFIRMED END:VEVENT END:VCALENDAR