Holger Kleinke's research focuses on finding and optimizing new thermoelectric materials. Thermoelectrics are capable of converting heat into electrical energy and vice versa. This environmentally friendly energy conversion currently has several applications, but is limited by its low efficiency. His research group is attempting to increase the efficiency so that thermoelectrics may be used to recover electricity from the nowadays abundant waste heat, e.g. in the exhaust of automobiles.
- Inorganic materials
- Solid-state chemistry
- Thermoelectric energy conversion
- Crystal structure predictions
One of Holger Kleinke's newest projects is to utilize Cu ion mobility to lower the thermal conductivity of thermoelectric materials. This mobility has to be localized within each unit cell in order to inhibit Cu ion migration throughout the material, which would otherwise cause device degradation. Since the thermoelectric properties depend on the thermopower as well as on the electrical and thermal conductivity, various property measurements are routinely carried out in the group. The syntheses are guided by calculations performed by students who are fascinated by the theoretical aspects of chemical research.
Holger Kleinke teaches both undergraduate and graduate courses. Course offerings have included structure and bonding, inorganic transition metal chemistry, main group & solid state chemistry, chemistry of inorganic solid state materials and inorganic materials.
Recent publications include
- High thermoelectric performance of Ba3Cu16–x(S,Te)11, P. Jafarzadeh, M. Oudah, A. Assoud, N. Farahi, E. Müller and H. Kleinke, J. Mater. Chem. C, 6, 13043 (2018).
- Thermoelectric properties of Bi-doped magnesium silicide stannides, L. R. Macario, X. Cheng, D. Ramirez, T. Mori and H. Kleinke, ACS Appl. Mater. Interf., 10, 40585 (2018).
- A new material with a composite crystal structure causing ultralow thermal conductivity and outstanding thermoelectric properties: Tl2Ag12Te7+δ, Y. Shi, A. Assoud, S. Ponou, S. Lidin and H. Kleinke, J. Am. Chem. Soc., 140, 8578 (2018).
- Tl2Ag12Se7: a new pnp conduction switching material with extraordinarily low thermal conductivity, Y. Shi, A. Assoud, C. R. Sankar and H. Kleinke, Chem. Mater., 29, 9565 (2017).
- Improved Bulk Materials with Thermoelectric Figure-of-Merit > 1: Tl10–xSnxTe6 and Tl10–xPbxTe6, Q. Guo, A. Assoud and H. Kleinke, Adv. Energy Mater., 4, 1400348 (2014).
Awards and Distinctions
- 2016-2017, Interim Executive Director, Waterloo Institute for Nanotechnology
- 2002, Ontario Distinguished Researcher Award. Toronto, Canada
- 2001, Canada Research Chair in Solid State Chemistry (tier II, NSERC) Ottawa, Canada
- 2000, Premier's Research Excellence Award (Province of Ontario) Toronto, Canada
- 1999, Fellowship for Habilitands (DFG). Bonn, Germany
- 1997-99, Liebig-Fellowship (FCI, Fonds der Chemischen Industrie and BMBF, Bundesministerium für Bildung, und Forschung). Frankfurt, Germany
- 1995-97, Postdoctoral Fellowship (DFG, Deutsche Forschungsgemeinschaft). Bonn, Germany
- 1994, Ph.D. Award (FCI, Fonds der Chemischen Industrie). Frankfurt, Germany
University of Waterloo Affiliations
- Program Director of the Collaborative Graduate Nanotechnology Program
- Member of the Waterloo Institute for Nanotechnology
Professional Associations and Service
- Science Faculty Council, 2015-present
- International Advisory Board member, 35th International Conference on Thermoelectrics, Wuhan, China, 2015-16
- Materials Nano Steering Committee, 2013-present
- Waterloo Institute for Nanotechnology Media Ambassador, 2011-present
- Chair of the Solid State Chemistry Symposium, 96th CSC conference and exhibition, Quebec City, QC, 2012-13
- Scientific Program Committee member, 30th International Conference on Thermoelectrics, Traverse City, MI, USA, 2010-11
- Materials Science Curriculum Committee, 2009-11
- Executive Committee, 2008-11
- Direct Thermal to Electrical Energy Conversion Materials and Applications Symposium Organizer (with Dr. Tritt, Clemson, Dr. Weidenkaff, EMPA, Dr. Funahashi, AIST, and Dr. Zhang, CAS), 8th Pacific Rim Conference on Ceramic and Glass Technology (PACRIM 8), Vancouver, BC, 2008-09
- Reviewer of the OGS Scholarships (visa students), 2009
The following news stories have featured Holger Kleinke's research:
Auto21.ca, January 21, 2013: From outer space to your car's tail pipe
1994 PhD, J.-G.-Universität Mainz, Germany
1991 MSc Chemistry, W.-W.-Universität Münster, Germany
1988 BSc Chemistry, W.-W.-Universität Münster, Germany