Optimization of GDLs for high-performance PEMFC employing stainless steel bipolar plates

Eom, KwangSup; Cho, EunAe; Jang, Ju-Seog; Kim, Hyoung‐Juhn; Lim, Tae‐Hoon; Hong, Bo; Lee, Jong Hyun

doi:10.1016/j.ijhydene.2012.12.061

Cited by 13 publications

(8 citation statements)

References 22 publications

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“…This could be due to the malformed pillar shape (figure type D SEM), which allows water to gather between the pillars and the catalyst layer and so hinders the mass and current transport. It is known that increasing the gas pressure inside a fuel cell results in better performance [42,43]. It is clear from the SEM images that the cross section of the ablated channels is smaller than the DRIE-etched channels.…”

Section: Mfc Characterizationmentioning

confidence: 98%

Picosecond laser ablation for silicon micro fuel cell fabrication

Scotti¹,

Trusheim²,

Kanninen³

et al. 2013

J. Micromech. Microeng.

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Abstract:We have investigated laser ablation as a microfabrication approach to produce micro fuel cells (MFCs) in silicon. Picosecond pulses (15 ps) at a wavelength of 355 nm are used to make all of the MFC structures. To assess the benefits and drawbacks of laser ablation, reference cells have been produced by deep reactive ion etching (DRIE) using matching geometries. Ablated and etched cells have been evaluated and compared side by side. Our conclusion is that picosecond laser ablation is very well suited for MFC fabrication. The ablated cells match or excel DRIE-microfabricated cells in terms of current and power densities. Ablated MFCs achieved 47.6 mW cm -2 of power density and 121 mA cm -2 current density.

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Section: Mfc Characterizationmentioning

confidence: 98%

Picosecond laser ablation for silicon micro fuel cell fabrication

Scotti¹,

Trusheim²,

Kanninen³

et al. 2013

J. Micromech. Microeng.

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“…In the PEMEC, as shown in Figure 1, a liquid/gas diffusion layer (LGDL) is one of key components, and is sandwiched by the catalyst layer and the current distributor / flow field, similar to one in PEMFC [5,19,22,23]. Its major functions are to conduct electrons and heat, and transport reactants/products to and from the reaction site with minimal activation, thermal, ohmic, interfacial, and fluidic losses [5,[24][25][26][27][28][29][30][31][32][33][34][35][36]. To meet these requirements, the LGDL has to provide:  Simultaneous liquid/gas permeabilities: reactants (liquid water) access the reaction sites from flow fields, and products of H2/O2 from reaction sites move into flow channels, which reduce their local concentration to improve the performance; 4  Electrical and thermal conductivities: conduct electrons away from the reaction sites at anode and meanwhile supply electrons to all reaction sites at cathode, and maintain efficient heat transport and uniform heat distribution;…”

Section: Introductionmentioning

confidence: 99%

Thin liquid/gas diffusion layers for high-efficiency hydrogen production from water splitting

et al. 2016

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In this study, a novel titanium thin LGDL with well-tunable pore morphologies was developed by employing nano-manufacturing and was applied in a standard PEMEC. The LGDL tests show significant performance improvements. The operating voltages required at a current density of 2.0 A/cm 2 were as low as 1.69 V, and its efficiency reached a report high of up to 88%. The new thin and flat LGDL with well-tunable straight pores has been demonstrated to remarkably reduce the ohmic, interfacial and transport losses. In addition, well-tunable features, including pore size, pore shape, pore distribution, and thus porosity and permeability, will be very valuable for developing PEMEC models and for validation of its simulations with optimal and repeatable performance. The LGDL thickness reduction from greater than 350 µm of conventional LGDLs to 25 µm will greatly decrease the weight and volume of PEMEC stacks, and represents a new direction for future developments of low-cost PEMECs with high performance.

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“…Owing to the increasing need for clean energy conversion systems, proton exchange membrane fuel cells (PEMFCs) are being developed as promising alternatives to fossil fuels as energy generating systems. [1][2][3][4][5][6][7][8][9] As one of the main components of PEMFCs, proton exchange membranes (PEMs) that are cheaper and are synthesized via a more simplified procedure are essential for advancing this technology. [10][11][12] The most widely used PEM is currently the perfluorinated sulfonic acid (PFSA) membrane which shows superior properties including high proton conductivity and durability in the temperature range of 20-80 °C.…”

Section: Introductionmentioning

confidence: 99%