Showing papers by "Prathap Haridoss published in 2011"
TL;DR: In this paper, a flow field design based on the improvement of the local cross-flow conditions in a split serpentine flow field is proposed, which offers the quadruple advantage of uniform reactant distribution over the entire cell active area, low overall pressure drop, and effective liquid water evacuation in the U-bends.
58 citations
TL;DR: In this article, the impact of the difference in structure and properties of the diffusion media used, on the design of the PEM fuel cell flow field was investigated, and the results indicated that the intrusion of carbon cloth into the channel, constraints the channel width in a flow field design if it were to be used with a carbon cloth GDM as opposed to a carbon paper GDM.
37 citations
TL;DR: In this article, a simple and unique off-cell experimental setup was developed to determine pressure as a function of position in the active area, due to reactant flow in a fuel cell flow field.
24 citations
TL;DR: In this article, experimental procedures to establish in-plane and through plane polytetrafluroethylene (PTFE) gradient in Gas Diffusion Layer (GDL) used in proton exchange membrane fuel cells (PEMFC) are presented.
Abstract: Experimental procedures to establish in-plane and through plane polytetrafluroethylene (PTFE) gradient in Gas Diffusion Layer (GDL) used in proton exchange membrane fuel cells (PEMFC) are presented in this work. In-plane PTFE gradients were obtained by exploiting capillary wicking of PTFE suspension. The through plane PTFE gradients were obtained by changing the drying temperature employed in PTFE loading procedure. The samples were characterized for fluorine distribution using energy dispersive spectrum (EDS) to gauge the PTFE distribution and change in hydrophobicity after PTFE treatment. The results indicate that manipulation of PTFE gradients are expected to result in effective water management in PEMFC.
16 citations
TL;DR: In this article, carbon cloth and carbon paper, two commonly used GDLs in PEMFC, are electrochemically aged in a simulated proton exchange membrane fuel cell (PEMFC) environment.
13 citations
TL;DR: In this article, the defect intensity differs according to the atmosphere which prevails in the production chamber of a CVD and arc discharge process, and broken bonds can result at the surfaces of carbon nanotubes.
Abstract: Carbon Nanotubes (CNTs) are of significant research interest due to their significant electrical, mechanical, electro-mechanical and thermal properties. This enables CNT to be used in advanced bio-medical, electronics and materials technological applications. CNTs can be synthesized by various methods such as Arc-discharge, Chemical Vapor Deposition (CVD), Laser ablation etc. Still challenge exists when it comes to the yield. In general CNTs are commercially synthesized by Arc-discharge and CVD techniques. In both the cases the defect intensity differs according to the atmosphere which prevails in the production chamber. In the case of CVD the defect intensity is mainly due to pentagons of carbon, which cause curved faces whereas in the case of arc discharge, broken bonds can result at the surfaces.
2 citations