Graphene is considered a promising ultracapacitor material toward high power and energy density because of its high conductivity and high surface area without pore tortuosity. However, the two-dimensional (2D) sheets tend to aggregate during the electrode fabrication process and align perpendicular to the flow direction of electrons and ions, which can reduce the available surface area and limi...

Dynamics of proton exchange membrane fuel cells (PEMFC) with hydrogen storage system for generating part of Hercules airplanes electrical energy is presented. Feasibility of using fuel cell (FC) for this airplane is evaluated by means of simulations. Temperature change and dual layer capacity effect are considered in all simulations. Using a three-level 3-phase inverter, FC's output voltage is ...

Kuruppu, Sandun Shivantha. M.S., Purdue University, May, 2010. Implementation and Performance Evaluation of a Regenerative Braking System coupled to Ultracapacitors for a Brushless DC Hub Motor Driven Electric Tricycle. Major Professor: Athula Kulatunga. Research related to electrical vehicles is gaining importance due to the energy crisis. An electric vehicle itself is far ahead of an internal...

This paper presents the Zero-Voltage Switching (ZVS) performance of Dual Active Bridge (DAB) DC-DC converter for high power density aerospace applications. Switching transitions of the transistor occurring in favorable conditions such as device zero-voltage or zero-current is called as soft-switching. The benefits of soft-switching are reduced switching losses, switch stress, low electromagneti...

Electrified ports using medium-voltage DC (MVDC) renewable energy microgrids require current-fed dc/dc converters in application scenarios such as battery or ultracapacitor charging units and hydrogen production systems. This paper designs a three-level phase-shift full-bridge (TL-PSFB) converter that interfaces with the MVDC microgrid. Its operation current source mode requires wide output vol...

The increasing need to slow down climate change for environmental protection demands further advancements toward regenerative energy and sustainable mobility. While individual mobility applications are assumed be satisfied with improving battery electric vehicles (BEVs), the growing sector of freight transport heavy-duty requires alternative solutions meet requirements long ranges high payloads...

Advances in power and propulsion energy management improvements can significantly contribute to reducing emissions. The International Maritime Organization (IMO) Marpol regulations impose increasingly stringent restrictions on ship’s emission. According the measured data of target ship typical working profiles, fluctuation, fuel consumption emission are analyzed, result represented that there s...

A supercapacitor, also called an ultracapacitor, is a high-capacity capacitor with capacitance value much higher than other capacitors, but lower voltage limits, that bridges the gap between electrolytic capacitors and rechargeable batteries. To synthesize graphene oxide/polypyrrole (GO/PPy) composite, sacrificial template needed such as MnO2 through polymerization of pyrrole in presence GO use...