Metal-organic frameworks (MOFs), which have advantages such as large surface area and high porosity, are recently investigated as a component of electrochemical catalysts to enhance the catalytic performance. But the influences of MOFs on the properties of catalysts such as surface structure, local structure of active sites, catalytic activity, and selectivity are still under investigation.

Platinum group metal-based (PGM) catalysts are widely applied in many electrochemical systems such as fuel cells or metalair batteries because of their excellent catalytic performance. But the high raw material cost of PGM catalysts has become a significant issue. In recent years, huge efforts have been made to reduce the material cost of electrochemical systems by developing non-PGM catalysts, and as one of the promising non-PGM catalysts, nitrogen-doped graphene (N-G) has emerged. In this research, nanoscale high-energy wet ball milling methodology was investigated as an effective synthesis method for N-G catalysts by using graphene oxide and melamine as raw materials. The main purpose is to study reaction mechanism of the synthesis process and the physical, chemical, and electrochemical properties of N-G catalysts generated by this mechanochemical approach.

An important function of the gas delivery channels in PEM fuel cells is the evacuation of water at the cathode. The resulting two-phase flow impedes reactant transport and causes parasitic losses. There is a need for research on two-phase flow in channels in which the phase fraction varies along the flow direction as in operating fuel cells. This work studies two-phase flow in 60cm long channels with distributed water injection through a porous GDL wall to examine the physics of flows relevant to fuel cells.

Jae-Young Lee, Jiyong Joo, Jae Kwang Lee, Sunghyun Uhm, Eon Soo Lee, Jae Hyuk Jang, Nam-Ki Kim, Yong-Chul Lee, Jaeyoung Lee

Korean J. Chem. Eng. 27(3), 843-847 (2010)

DOI: 10.1007/s11814-010-0141-7