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I suspect one reason work is continuing on H2 FCEVs is that the lessons learned are, at least in part, transferrable to other types of vehicle. My understanding is that current H2FCEV research vehicles are hybrid BEV-FCEV.
One of the issues with FC is that they can't immediately change the rate of energy they release, so the FC is buffered with chemical cell batteries until the FC catches up. That technology is appropriate for use in ICE hybrids and pure BEV.
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