Southern University and Agricultural and Mechanical College

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Scott A. Wicker, Ph.D.

Adjunct-Assistant Professor of Chemistry

Bachelor's Degree: Grambling State University, 2001

Ph.D.: Southern University and A & M College, 2011

Environmental Toxicology, Inorganic/Solid State Chemistry

Office:  107 Fisher Hall

Phone:  225-771-5119

E-mail Addressscott_wicker@subr.edu

Web Page Links:  www.linkedin.com/in/scottwicker/

Research Interests:

In a top down approach, my research interests lie in the areas of inorganic chemistry, solid-state electrochemistry, crystallography and material science. More precisely, in my dissertation, I studied how a coordination chemistry synthesis technique affected the crystallographic electronic structure which ultimately altered the material science electrochemical properties. Current investigations and conversations with other people working in related fields has generated a number of interesting questions that relates to better understanding the fundamental science which govern solid-state and soft chemical method synthesis techniques through the use of in situ type studies.

Current research focuses on the use of X-ray’s as a method to explore (in situ; both time and temperature) the perceived solid-state reactions between group 1 metal carbonates and period 4 transitional metal oxides. Journal investigations suggested this reaction is purely a first order solid state one step process. Both TGA-DSC kinetic analysis using Friedman and powder X-ray Diffraction (HRXRD at APS) analysis using Rietveld refinement suggest this is a very complex liquid-solid reaction. One of the most important pieces of evidence I uncovered is this reaction contains three distinct regions that can be describe as an reversible, irreversible and diffusion control (Fisk’s 2nd Law) before the core backbone transitional metal oxide rearranges to the desired electrochemical active material.   

My recent finding has brought about many more fundamental science type questions which when answered will contribute to a better understanding of diffusion at the liquid-solid interface. This has lead to my current research interest which includes developing cheap and affordable green chemical methods for synthesizing advance energy storage materials. Since synthesis techniques have shown to affect both negatively and positively the quality of advance energy storage materials, this leads to an indirect interest which is to use a traditional solid-state synthesis method to monitor the reaction and reaction kinetics during the development of new advance energy storage materials. By monitoring the solid-state reaction kinetics, one can better understand how cation(s) mixing and/or dopants affects electronic structure, Lithium migration barriers, thermal expansion and structural stability affects electrochemical properties.

One of my most important research interests is to better understand how atomic layer alterations and subsequent defect affects the electrochemical properties of advance energy storage materials. If I can control particle size, morphology and unit cell atoms, volume, defects and other properties like spheres, cube, flakes, and nano-tube from synthesis techniques this will afford the opportunities to build suitable energy storage devices for very specific industries. A connection can be made from the cycle-ability, stability and voltage profile to electronic structure. 

 

Summary:

 

1). Develop and study new mix metal oxides materials for the use in batteries, fuel cells, catalysis and photoelectrochemical cells. Specific interest is to study how the electronic structure changes as a dopant is added to traditional transitional metal oxide use as energy storage materials. What new or defect structures arise from doping transitional metal oxides. How does various changes in the electronic structure effects the electrochemical properties of metal oxides.

 

2). Design environmentally friendly, cheap and low temperature methods for the synthesis of nano to micro size particles.

 

3). Use in situ X-ray diffraction and TGA-FTIR methods to study phase changes and reaction kinetics.

 

4). Use Density Functional Theory (DFT) to predict probable transition states of the solid-solid and liquid-solid state reaction mechanism.

 

Awards and Honors:

Carl Storm Underrepresented Minority Fellowship, Gordon Research Conferences on SOLID STATE CHEMISTRY I, Colby-Sawyer College in New London, NH. (July 23 –28, 2006).          

HBCU-RISE, Southern University and A&M College (January 2006 – May 2008).          

Invited Participant to the 59th Meeting of Nobel Laureates 19th Forum dedicated to Chemistry in Lindau, Germany, NSF award (June 28th to July 3rd, 2009).

Twelfth National School on Neutron and X-ray Scattering, Argonne National Laboratory, Chicago, IL & Oak Ridge National Laboratory, Oak Ridge, TN, U.S. Department of Energy award (June 12 – 26, 2010).

Center for Enabling New Technologies Through Catalysis (CENTC) Summer School, University of Washington, Seattle, Washington, NSF award (July 19 – 22, 2010).

 

Selected Publications:

1.      Scott A. Wicker and Edwin H. Walker, Jr. “Revisited: Decomposition or Melting? Formation Mechansim Investigation of LiCoO2 via In-Situ Time-Resolved X-ray Diffraction”. Inorganic Chemistry. Volume 52, Number 4, pp. 1772-1779, Web. January 31, 2013. DOI: 10.1021/ic301516a.

2.     Ch. V. Subba Reddy, Rudolf Holze, Scott A. Wicker Sr., Edwin H. Walker Jr., Quinton L. Williams, and Rajamohan R. Kalluru. “Synthesis and Characterization of (Ru-Sn)O2 Nanoparticles for Supercapacitors”. Materials Sciences and Applications. Volume 2, Number 9, pp. 1175-1179, September 2011. DOI:10.4236/msa.2011.29158

3.     Scott A. Wicker. Development of a Green Soft Chemical Method for the Synthesis of Cathode Materials Utilized in Lithium-ion Energy Storage Technologies. ProQuest UMI Dissertation Publishing, pp. 1 – 167, (PQDT) Dissertation Number: 3487688, December 2011. ISBN: 9781267072139. http://search.proquest.com/docview/913392500?accountid=14135

4.     Ch. V. Subba Reddy, Rudolf Holze, Edwin H. Walker, Jr., Scott A. Wicker, Sr., Rajamohan R. Kalluru, Quinton L. Williams, Wilbur Walters. Synthesis and Characterization of Lithium Vanadates for Electrochemical Applications. International Journal of Electrochemical Science. 5, pp. 1355-1366, 2010.

5.     Ch. V. Subba Reddy, Edwin H. Walker, Jr., Scott A. Wicker, Sr., Quinton L. Williams, and Rajamohan R. Kalluru. Synthesis of VO2(B) Nanorods for Li Battery Application. Current Applied Physics, Vol. 9, Issue 6, pp. 1195 – 1198, DOI:10.1016/j.cap.2009.01.012, November 2009.

6.     Ch. V. Subba Reddy, Scott A. Wicker Sr., Edwin H. Walker, Jr., Quinton L. Williams, and Rajamohan R. Kalluru. “Vanadium Oxide Nanorods for Li-Ion Battery Applications”. Journal of The Electrochemical Society. 155 (8), pp. a599-a602, 2008.

 

7.     Ch. V. Subba Reddy, Edwin H. Walker Jr., Scott A. Wicker Sr., Quinton L. Williams, and Rajamohan R. Kalluru. “Characterization of MoO3 Nanorods for Lithium Battery Using PVP as a Surfactant”. Journal of Solid State Electrochemistry, 13, pp. 1945 – 1949, 2009. DOI:10.1007/s10008-008-0741-x, 2008.