Biography:

In the past Chul Min Hwang has collaborated on articles with Hiroshi Ito. One of their most recent publications is Influence of properties of gas diffusion layers on the performance of polymer electrolyte-based unitized reversible fuel cells. Which was published in journal International Journal of Hydrogen Energy.

More information about Chul Min Hwang research including statistics on their citations can be found on their Copernicus Academic profile page.

Chul Min Hwang's Articles: (3)

Influence of properties of gas diffusion layers on the performance of polymer electrolyte-based unitized reversible fuel cells

AbstractPolymer electrolyte-based unitized reversible fuel cells (URFCs) combine the functionality of a fuel cell and an electrolyzer in a single device. In a URFC, titanium (Ti)-felt is used as a gas diffusion layer (GDL) of the oxygen electrode, whereas typical carbon paper is used as a GDL of the hydrogen electrode. Different samples of Ti-felt with different structural properties (porosity and fiber diameter) and PTFE content were prepared for use as GDLs of the oxygen electrode, and the relation between the properties of the GDL and the fuel cell performance was examined for both fuel cell and electrolysis operation modes. Experimental results showed that the cell with a Ti-felt GDL of 80 μm fiber diameter had the highest round-trip efficiency due to excellent fuel cell operation under relatively high-humidity conditions despite degradation in performance in the electrolysis mode.

Effect of through-plane polytetrafluoroethylene distribution in a gas diffusion layer on a polymer electrolyte unitized reversible fuel cell

Highlights•Polymer electrolyte unitized reversible fuel cell was investigated experimentally.•The dependence of PTFE distribution on the drying conditions was examined using SEM-EDS analysis.•The effect of through-plane PTFE distribution in the oxygen-side GDL has been studied.•A uniform PTFE distribution in the Ti-felt GDL improved the fuel cell performance.•The current density at the cell voltage of 0.6 V was improved by a factor of about 1.9.

Effect of titanium powder loading in gas diffusion layer of a polymer electrolyte unitized reversible fuel cell

AbstractPolymer electrolyte-based unitized reversible fuel cells (URFCs) can be operated either as an electrolyzer to split water into hydrogen and oxygen using electric power or as a fuel cell to supply electric power when fed hydrogen and oxygen or air. In a URFC, titanium (Ti)-felt is used as a gas diffusion layer (GDL) in the oxygen electrode and typical carbon paper is used as a GDL in the hydrogen electrode. Here, first, Ti-powder was loaded into the Ti-felt GDL in URFCs to produce an effective pore distribution for water management in the membrane. Then, the effect of this Ti-powder loading on the cell performance was examined for both fuel cell and electrolysis operations. Experimental results revealed that the Ti-powder loading significantly improved the fuel cell performance under fully humidified conditions (relative humidity (RH) = 100%), but not under relatively dry conditions (RH = 66%). In contrast, the Ti-powder loading had no effect on the electrolysis performance.

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