Abstract: An environmentally friendly and inexpensive dielectric coolant for fuel cell stacks. The present invention is directed to a fuel cell, a system, and a method of cooling a fuel cell. The fuel cell is configured to react fuel with oxygen to generate an electric current and at least one reaction product and comprises an electrochemical catalytic reaction cell configured to include a fuel flowpath, an oxygen flowpath, and a coolant flowpath fluidly decoupled from the fuel flowpath and the oxygen flowpath. The coolant flowpath defines a coolant isolation manifold that includes a fluid dielectric coolant comprising a vegetable oil-based dielectric fluid. It is emphasized that this abstract is provided to comply with the rules requiring an abstract, which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 C.F.R. §1.72(b).