Keryn K. Lian

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Ultracapacitors are energy storage devices that can be connected in parallel with batteries to create a hybrid power system. This hybrid configuration provides a higher power density than a single battery and helps extend the life of the batteries. An important issue is the voltage regulation of a battery-supplied dc bus subjected to a long high-power(More)
Imidazolium cations derived from ionic liquids were demonstrated as effective linker molecules for the layer-by-layer (LbL) deposition of polyoxometalates (POMs) to increase the charge storage of multi-walled carbon nanotube (MWCNT) electrodes. MWCNTs modified with GeMo12O40(4-) (GeMo12) via an imidazolium cation linker demonstrated highly reversible redox(More)
Batteries connected to the dc grid are exposed to a variety of currents. We explore in this paper the response of the battery to commonly seen current waveforms to understand the impact of the converter on the battery. At the frequencies considered, the battery's small-signal model is shown through impedance spectroscopy and ripple tests to be well(More)
The effects of nano-SiO2 and nano-TiO2 fillers on a thin film silicotungstic acid (SiWA)-H3PO4-poly(vinyl alcohol) (PVA) proton conducting polymer electrolyte were studied and compared with respect to their proton conductivity, environmental stability, and dielectric properties, across a temperature range from 243 to 323 K. Three major effects of these(More)
Electrochemical Capacitors (EC) are important energy storage devices as stand-alone or in hybrid energy systems for high power delivery. The key components in ECs are electrodes and electrolytes, which have been investigated extensively [1,2]. The electrodes are either based on electrochemical double layer (EDLC) or pseudocapacitance [1,2]. While the former(More)
The interactions of H2O and H2S monomers with Cu(111) in the absence and presence of an external electric field are studied using density functional theory. It is found that the adsorption is accompanied by a rippled pattern of the surface Cu atoms and electron accumulation on the surface Cu atoms surrounding the adsorption site. The response of the(More)
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