Design of magnesium phosphate cement based composite for high performance bipolar plate of fuel cells

Abstract

In this work, we report a comprehensive study on a magnesium phosphate cement (MPC) based composite as the construction material for high performance bipolar plates of fuel cells. MPC with partial replacement of fly ash was employed as the binding matrix. Some carbon-based materials, such as graphite, carbon black, carbon fiber, and multi-walled carbon nanotubes were used to construct the conductive phase. A simple hot-press process was applied to produce the composite. The formula and the structure of the composite was modified and adjusted to optimize the properties of the composite to meet the US DOE 2015 technical targets, including the introducing of a reinforcement support. Finally, all the technical targets such as electrical conductivity (>100 S cm À1 ), the flexural strength (>25 MPa), the corrosion resistance (<1 mA cm À2 ), and gas permeability (<10 À5 cm 3 (s cm 2 ) À1 ) were achieved as well as low cost (<5 $ per kW). The optimized formula and the detailed procedures to fabricate the MPC based composite were concluded.

Development and Characterization of Coal-Based Thermoplastic Composite Material for Sustainable Construction

“…Lastly, following cooling, the filler particles are permanently compressed and strongly bonded together. These theories have been previously supported by relevant publications [18][19][20]. A sample of CTC composite with 70% bituminous coal and 30% HDPE binder by weight fraction is shown in Figure 4.…”

Effect of graphene oxide on the mechanical properties and the formation of layered double hydroxides (LDHs) in alkali-activated slag cement

“…carbon nanofibres, carbon nanotubes and graphene, has offered an opportunity to improve the toughness of cement-based materials [13]. The combination of cement with a small amount of carbon material has an admirable impact on the mechanical behaviour of OPC and other inorganic cements [13][14][15][16]. Of all of the carbon-based materials, two-dimensional (2D) graphene oxide (GO) sheets with an ultra-high dispersibility and a superior aspect ratio compared to other nano-carbon materials show a suitable performance in a cement matrix [13,17].…”

Passive Small Direct Alcohol Fuel Cells for Low-Power Portable Applications: Assessment Based on Innovative Increments since 2018

“…However, they can be corroded in the acidic environment of the PEM fuel cell anode, even if anticorrosion coatings are applied. Hence, this study was pertinent, where BPs made of magnesia phosphate cement (MPC) composite with two different patterns (nine and 16 circular holes with same total hole area) fabricated through a hot-press-assisted hydration process were used, following their previous studies [149,150]. According to the authors, the MPC material satisfied both the technical and the cost targets of the US Department of Energy 2015 requirements.…”

“…Both the single-cell PS-DMFC (with an active area of ~4.52 cm 2 , approximate to the total area of the BP holes) and the fuel cell stack (composed of three of these single cells in series) were assembled using the novel MPC-based BPs (Figure 15). different patterns (nine and 16 circular holes with same total hole area) fabricated through a hot-press-assisted hydration process were used, following their previous studies [149,150]. According to the authors, the MPC material satisfied both the technical and the cost targets of the US Department of Energy 2015 requirements.…”