Speakers

Photocatalytic and Photoelectrochemical Conversions for Energy and Environmental Applications

Wonyong_Choi
Wonyong CHOI
POSTECH, Korea
14:45~15:30,November 20th, 2015

Abstract

:

The photoinduced electron transfers occurring at the semiconductor surface are the key process of solar photosynthetic and photocatalytic processes. Metal oxides such as TiO2, WO3, and Fe2O3 that consists of earth-abundant elements are the most practical base materials for such applications. Despite their popularity as solar conversion materials, breakthroughs in materials development have yet to be achieved for practical applications. A variety of approaches have been investigated to modify the base metal oxides using diverse inorganic and organic materials. The heterojunctions built at the interface of metal oxide reduce the charge recombination or enhance the interfacial charge transfer to achieve the higher conversion efficiency. In this talk, various modifications of metal oxides with interfacial heterojunctions will be introduced and discussed for photoelectrochemical and photosynthetic applications. The specific examples include dual-purpose photocatalysis for H2-recovering water treatment, thin alumina layer-coated WO3 for water oxidation, thin TaOxNy layer coated N-TiO2 nanotubes for water splitting, TiO2/graphene composites, hydrogenated Sn-doped hematite (H-Sn-Fe2O3) for photoelectrochemical water splitting, and charge transfer complexation on the surface of TiO2. Each modification method has a different effect on the solar conversion activity and the mechanisms, which will be discussed in detail.

 

Professional Activities

:

  • 2014 Elected as Fellow of the Royal Society of Chemistry (FRSC)
  •  2014 Appointed as DeTao Master (2014.10), DeTao Masters Academy, Shanghai, China
  • 2014 Elected as Fellow of Korean Academy of Science and Technology
  • 2012 Namgo (Jong-Ryul Lee) Chair Professor, POSTECH
  • 2011 Invited Visiting Professor (Sept. 19-24, 2011); University Lille 1, France
  • 2011 Erudite Visiting Professor (Feb. 7-12, 2011); Erudite Scholar-in-Residence Programme; Kerala State Higher Education Council/Mahatma Gandhi University (Kottayam, Kerala, India)
  • 2008 Ph.D. Molecular Virology (Division of Molecular and Life Sciences), Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea
  • 2008.8-2014.7 Postdoctoral fellow/Advisor: Yuh Nung Jan & Lily Yeh Jan, Jan lab, UCSF, CA
  • 2007.7-2008.7 Postdoctoral fellow/Advisor: Dr. Sung Key Jang, Molecular Virology lab, POSTECH, Pohang, Korea
  • 2006 Young Scientist Award (Korean Academy of Science and Technology; Ministry of Science & Technology; presented by the president of Korea)
  • 2005 Co-founder, PBG(Pohang Biology Group)
  • 2005, Spring Teaching Assistant, Biochemistry, POSTECH
  • 2003 Elected as Associate Member of Korean Academy of Science and Technology
  • 1998.2-Present Professor, School of Environmental Science and Engineering (also at Dept. of Chemical Engineering as of June 2008), POSTECH
  • 1996.6-1998.2 Postdoctoral Scholar, NASA/Caltech Jet Propulsion Laboratory (JPL), Atmospheric Chemistry Research Element, Earth and Space Sciences Division
  • 1996.6 Ph.D., Chemistry (Environmental Chemistry)
  • California Institute of Technology (CALTECH), Pasadena, CA, U.S.A.
  • 1990.2 M.S., Chemistry(Physical Chemistry), Pohang University of Science and Technology(POSTECH), Pohang, Korea
  • 1988.2 B.S.(with honors), Engineering(Chemical Technology), Seoul National University(SNU), Seoul, Korea