Ballard MEAs

Ballard MEAs are supplied by Johnson Matthey UK from a singlepurpose new plant in the UK, backed by research laboratories. The Ballard MEA technological story is given by Ralph etal., 1997, followed by Ralph and Hogarth (2002) and Ralph etal. (2002 2003), and which are paralleled in India by Kumar etal. (1995). The battle has been to get 

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The core of the Ballard fuel cell consists of a membrane electrode assembly (MEA) that is placed between two flow-field plates. The flow-field plates direct H2 to the anode and Oz (from air) to the cathode. To obtain the desired amount of electric power, individual fuel cells are combined to form fuel cell stacks. Increasing the number of cells in a stack increases the voltage, and... 

Ralph T R etal., 1997, Membrane Electrode Assemblies, MEA s, for Ballard Fuel Cells. Platinum Metals Review, 41(3). 

Figure 17.10 shows the performance in Ballard stack hardware of three different cell-reversal-tolerant electrocatalysts prepared by Johnson Matthey. In this case the MEAs have received significant prior cell-reversal periods to drive the anodes to the limit of their tolerance. The impact that inclusion of a water electrolysis electrocatalyst has on the ability of the anode to sustain water electrolysis is evident. At the standard 40 wt% Pt, 20 wt% Ru/Shawinigan carbon black-based anode, the water electrolysis plateau is so short that it is difficult to detect. Only by using a cell reversal-tolerant electrocatalyst in the anode water electrolysis are plateaus evident in Figure 17.10. As a result, the degree of carbon corrosion is significantly reduced by the cell-reversal-tolerant electrocatalysts. The...

Figure 23.22. F ,j and F ax distributions of (a) the Pt/C fiesh powder, (b) eathode eatalyst layers for a fresh MEA, and (c) an MEA after durability testing (10-eell stacks based on Ballard s Mark9 technology operated for 2500 hours using an advanced automotive duty cycle (AADC), 2,500 hours) [37]. (Reprinted by permission of ECS—The Electrochemical Society, from Li J, He P, Wang K, Davis M, Ye S. Characterization of catalyst layer structural changes in PEMFC as a function of durability testing.)...

Johnson Matthey Reference from www.matthey.com No Yes Manufacturer of MEA. Supplies halt the world demand, including Ballard s for catalyst. R D facilities in UK, production facilities in the UK emd Pennsylvania... 

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