As such, the importance of electrocatalysts during this process can be examined as they can lower the activation energy of the reactions happening within the fuel cells, allowing a more efficient reaction. Because electrocatalysts separate the electrons and deliver them through the external circuit, the magnitude of this current will also be determined by the rate of the electrocatalysts at both the anode and the cathode, which is limited by the electrode with the lowest electrocatalytic rate. Hence, the rate of the electrocatalysts throughout the fuel cell will be crucial to its efficiency. Because the kinetics of the cathode is typically much slower than the anode, the catalysts of the cathode will be significant to the ORR of the fuel cells to maintain a high rate of electrocatalysts at both electrodes of the fuel cell.