Assertion: fuel cell's cost | /r/HasProperty | source
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Source sentences:
text: For PEMFC systems, proton exchange membranes, precious metal catalysts (usually platinum), gas diffusion layers, and bipolar plates make up 70 percent of a system's cost [Source:
text: For example, the proton exchange membranes, gas diffusion layers, bipolar plates and most particularly the precious metal catalysts make up around 70 percent of a PEMFC's cost [Source: