Keryn K. Lian | BSc (Tongji), MSc (Calgary), PhD (Toronto)
Office: MB 212A
Research Group: Flexible Energy & Electronics (FEE) Laboratory
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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.
Han Gao and Keryn Lian, “A Comparative Study of Nano-SiO2 and Nano-TiO2 Fillers on Proton Conductivity and Dielectric Response of a Silicotungstic Acid–H3PO4–Poly(vinyl alcohol) Polymer Electrolyte”, ACS Appl. Mater. Interfaces. Accepted, 2013, DOI: 10.1021/am4045103.
M. Genovese, Y. Foong, and K. Lian, “Germanomolybdate (GeMo12O404-) Modified Carbon Nanotube Composites for Electrochemical Capacitors”, Electrochimica Acta. 117, 153– 158, 2014
K. Jost, D. Stenger, C. Perez, J. McDonough, K. Lian, Y. Gogotsi, G. Dion, Knitted and screen printed carbon fiber EDLCs for applications in wearable electronics, Energy & Environmental Science. 6(9), 2698-2705, 2013.
S.Ketabi and K.Lian “Effect of SiO2 on Conductivity and Structural Properties of PEO–EMIHSO4 Polymer Electrolyte and Enabled Solid Electrochemical Capacitors”, Electrochimica Acta 103, 174-178, 2013.
S. Ketabi and K. Lian, “Thermal and Structural Characterizations of PEO-EMIHSO4 Polymer Electrolytes”, Solid State Ionics, 227, 86-90, 2012.
H. Gao and K. Lian, “Advanced Proton Conducting Membrane for Ultra-High Rate Solid Flexible Electrochemical Capacitors”, Journal of Materials Chemistry, 22, 21272-21278, 2012.
H. Gao, H. Wu and K. Lian, “A Comparative Study of Polymer Electrolytes for Ultrahigh Rate Applications”, Electrochemistry Communications, 17 48-51 2012.
H. Gao and K. Lian, “Proton Conducting Heteropoly Acid Based Electrolyte for High Rate Solid Electrochemical Capacitors”, Journal of the Electrochemical Society, 158(12), A1371-A1378, 2011.
J. Chang, F. Dawson, and K. Lian, “A First Principles Approach to Develop a Dynamic Model of Electrochemical Capacitors”, IEEE Transactions on Power Electronics, 26(12), 3472-3480, 2011.
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.
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.
S. Park, K. Lian, and Y. Gogotsi, “Pseudocapacitive Behavior of Carbon Nanoparticles Modified by Phosphomolybdic Acid”, Journal Electrochem Soc., 156(11), A921, 2009.
K. Lian, S. O’Rourke, D. Sadler, M. Eliacin, C. Gamboa, R. Terbrueggen, and M. Chason, “Integrated microfluidic components on a printed wiring board platform”, Sensors and Actuators B (Chemical), 138(1), 21, 2009.
K. Lian and C. M. Li, “Solid Polymer Electrochemical Capacitors Using Heteropoly Acid Electrolytes”, Electrochem. Communications, 11(1) 22, 2009.
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.