University of Toronto | Faculty of Applied Science & Engineering
Department of Materials Science & Engineering
Keryn K. Lian | Associate Professor
BSc (Tongji), MSc (Calgary), PhD (Toronto)
Office: MB 212A
T: 416.978.8631
E: keryn.lian@utoronto.ca
Research Group:
Flexible Energy & Electronics (FEE) Laboratory
Other websites:
http://www.modeldrivenengineering.org/feel/
Professional Memberships
Electrochemical Society
Materials Research Society (MRS)
Research Areas
Electrochemical energy storage materials, devices, and hybrid systems
The electrochemical capacitor (EC) is an important energy storage technology for high power and fast energy deliveries. Our research in EC covers electrode modifications, polymer electrolytes development, and cell assembly and characterization.
In terms of electrodes, we are focusing on chemical modifications of porous and nonporous carbon materials to add pseudocapacitance for enhanced energy density and conductivity. As for electrolytes, we are investigating polymer proton conducting electrolytes for ECs which can greatly improve the volume energy and power density with very thin form factors. The thin cells are combined with batteries or solar cells to form hybrid energy devices for prolonged fast energy delivery and for self-powered energy devices.
Printed Organic Memories
Printed large area flexible electronics could drastically change the future electronics surrounding our daily lives. Our research is to add memory functionality to current printed electronics.
We are developing a simple crossbar memory on flexible plastic substrates through deposition of conducting, semiconducting, and insulating inks via solution deposition and screen printing processes. The semiconducting ink has a bistable characteristic which can switch the impedance from high (“Off” state) to low (“On” state) with an On/Off ratio up to106. Both write-once-read-many times (WORM) and rewritable memories have been demonstrated with various organic molecules. Our approach provides a high throughput and low cost solution for devices such as printed RF-ID, smart packaging or intelligent posters.
Select Publications
H. Gao and K. Lian, "High Rate All-Solid Electrochemical Capacitors Using Proton Conducting Polymer Electrolytes", Journal of Power Sources. 196(20), 8855-8857, 2011.
T. Akter, K. Hu and K. Lian, "Surface Modifications of Nano Carbon Materials for Electrochemical Capacitors", Electrochimica Acta, 56(14), 4966-4971, 2011.
T. Weigert, Q.Tian, and K.Lian, "State-of-Charge Prediction of Batteries and Battery-Supercapacitor Hybrids Using Artificial Neural Networks", Journal of Power Sources, 196(8), 4061, 2011.
H.Gao and K.Lian, "Characterizations of Proton Conducting Polymer Electrolytes for Electrochemical Capacitors", Electrochimica Acta, 56, 122-127, 2010.
H.Gao, Q.Tian, and K. Lian, "Polyvinyl Alcohol-Heteropoly Acid Polymer Electrolytes and Their Applications in Electrochemical Capacitors", Solid State Ionics, 181, 874-876, 2010.
K. Lian, R. Li, H. Wang, Z.H. Lu, and J. Zhang, "DC and AC analyses of a printed flexible memory device" , Organic Electronics, 11(6), 1141-1144, 2010.
K. Lian and Q. Tian, “Asymmetric Electrochemical Capacitors Using Proton Conducting Polymer Electrolytes”, Electrochemistry Communications 12, 517–519, 2010
K. Lian, H. Wang, R. Li, J. Zhang and D. Gamota, “Copper Phthalocyanine-based Printed Memory Devices”, Mat. Sci. and Eng. B, 167, 12–16, 2010.
Qifeng Tian and Keryn Lian, "In Situ Characterization of Heteropolyacid Based Electrochemical Capacitors", Electrochemical and Solid State letters, 13(1). A4, 2010.
S. Park, K. Lian, and Y. Gogotsi, “Pseudocapacitive Behavior of Carbon Nanoparticles Modified by Phosphomolybdic Acid”, J. Electrochem. Soc., 156(11) A921, 2009.
Keryn Lian and Chang Ming Li, “Solid Polymer Electrochemical Capacitors Using Heteropoly Acid Electrolytes”, Electrochem. Communications, 11(1) 22, 2009.
Keryn Lian and Chang Ming Li, “Asymmetrical Electrochemical Capacitors Using Heteropoly Acid Electrolytes”, Electrochemical and Solid State letters, 12(1). A10, 2009.
Keryn Lian, Shawn O’Rourke, Daniel Sadler, Manes Eliacin, Claudia Gamboa, Robert Terbrueggen, and Marc Chason, ” Integrated microfluidic components on a printed wiring board platform”, Sensors and Actuators B (Chemical), 138(1), 21, 2009.
Keryn Lian, Jie Zhang, Rophina Li, Hui Wang and Wayne Hsi, “Printed Organic Memory Devices”, “Nonvolatile Memory and Its Evolution", ECS Transactions, 16(20), 35, 2008.
Keryn Lian and Changming Li, “Heteropoly Acid Electrolytes for Double Layer Capacitors and Pseudocapacitors”, Electrochemical and Solid State letters, 11(9), A158, 2008.
C. Portet, J. Chmiola, Y. Gogotsi, S. Park, K. Lian, “Electrochemical characterizations of carbon nanomaterials by the cavity microelectrode technique”, Electrochimica Acta, 53(26), 7675-7680 2008.
Keryn Lian and Jie Zhang, “Solution Processed Organic Memory Devices" ISTC-2008, 679-684. 2008.
Marc Chason, Daniel R. Gamota, Paul W. Brazis Jr., Krishna Kalyanasundaram, Jie Zhang, Keryn K. Lian, and Robert Croswell, “Toward Manufacturing Low-Cost, Large-Area Electronics”, MRS Bulletin, 31(6), 471-475, 2006.