The best replacement for fuel cells is batteries.

The best alternatives to fuel cells are rated as following:
★★★★★  batteries
★★★  fossil fuels
★★  internal combustion engines
★★  electric cars
★  microturbines
  gas tanks
  solar cells

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Google Trends

Scale is based on the average worldwide traffic of fuel cells in all years. Click on graph for more.
fuel cells
batteries
fossil fuels