Final answer:
If the temperature of a fuel cell is increased, the thermodynamic potential would increase, the kinetic overpotential would decrease, and the ohmic overpotential would also decrease.
Step-by-step explanation:
If the temperature of a fuel cell is increased, several changes will occur. First, the thermodynamic potential would increase. This is because the thermodynamic potential is related to the enthalpy change of the reaction, which is dependent on temperature. Second, the kinetic overpotential would decrease. Kinetic overpotential is caused by slow reaction rates at low temperatures, so increasing the temperature would speed up the reactions and reduce the kinetic overpotential. Lastly, the ohmic overpotential would also decrease. Ohmic overpotential is caused by resistance to the flow of ions in the fuel cell, and increasing the temperature reduces this resistance.