An environmentally friendly and inexpensive dielectric coolant for
fuel cell stacks. The present invention is directed to a fuel cell (1), a
system, and a method of cooling a fuel cell (16). The fuel cell is
configured to react fuel with oxygen (52) to generate an electric
current and at least one reaction product and comprises an
electrochemical catalytic reaction cell (1) configured to include a fuel
flowpath (26), an oxygen flowpath (58), and a coolant flowpath (16)
fluidly decoupled from the fuel flowpath and the oxygen flowpath. The
coolant flowpath defines a coolant isolation manifold (20) that includes
a fluid dielectric coolant comprising a vegetable oil-based dielectric
fluid.