Showing papers by "Dai Gil Lee published in 2017"
TL;DR: In this paper, a carbon felt composite bipolar plate is developed for a high-temperature PEMFC (HT-PEMFC) using randomly oriented non-woven carbon felt and a cyanate ester-modified epoxy.
43 citations
TL;DR: In this article, a nano carbon/fluoroelastomer composite bipolar plate was developed to substitute for the conventional thick graphite bipolar plate, which is a multifunctional component that provides an electrical path and separates cells.
34 citations
TL;DR: A scalable nanofastener featuring a 3D interlocked interfacial structure between the hydrocarbon membranes and perfluorinated sulfonic acid based catalyst layer is presented to overcome the interfacial issue of hydrocarbon membrane based polymer electrolyte membrane fuel cells.
Abstract: A scalable nanofastener featuring a 3D interlocked interfacial structure between the hydrocarbon membrane and perfluorinated sulfonic acid based catalyst layer is presented to overcome the interfacial issue of hydrocarbon membrane based polymer electrolyte membrane fuel cells. The nanofastener-introduced membrane electrode assembly (MEA) withstands more than 3000 humidity cycles, which is 20 times higher durability than that of MEA without nanofastener.
33 citations
TL;DR: In this paper, a non-woven carbon felt composite bipolar plate was developed to obtain improved electrical properties with low fabrication pressure, and the soft layer method was also used to expose bare carbon fibers.
29 citations
TL;DR: In this article, a composite adherend that does not require any surface treatment to constitute an adhesive joint is developed, which is manufactured by a soft layer method to expose bare fibers on the surface during composite fabrication.
13 citations
TL;DR: The carbon/epoxy composite bipolar plate is a promising substitute for the conventional graphite bipolar plate for the vanadium redox flow battery due to its high mechanical property and productivity as mentioned in this paper.
Abstract: The carbon/epoxy composite bipolar plate is a promising substitute for the conventional graphite bipolar plate for the vanadium redox flow battery due to its high mechanical property and productivi
6 citations
TL;DR: A method to expose fibers on the composite surface is demonstrated, which increases the electrical conductivity and mechanical strength of the composite are increased drastically.
Abstract: The bipolar plate is a key component in proton exchange membrane fuel cells (PEMFCs) and vanadium redox flow batteries (VRFBs). It is a multi-functional component that should have high electrical conductivity, high mechanical properties, and high productivity.
In this regard, a carbon fiber/epoxy resin composite can be an ideal material to replace the conventional graphite bipolar plate, which often leads to the catastrophic failure of the entire system because of its inherent brittleness. Though the carbon/epoxy composite has high mechanical properties and is easy to manufacture, the electrical conductivity in the through-thickness direction is poor because of the resin-rich layer that forms on its surface. Therefore, an expanded graphite coating was adopted to solve the electrical conductivity issue. However, the expanded graphite coating not only increases the manufacturing costs but also has poor mechanical properties.
In this study, a method to expose fibers on the composite surface is demonstrated. There are currently many methods that can expose fibers by surface treatment after the fabrication of the composite. This new method, however, does not require surface treatment because the fibers are exposed during the manufacture of the composite. By exposing bare carbon fibers on the surface, the electrical conductivity and mechanical strength of the composite are increased drastically.
2 citations