Max Planck Institute for Dynamics of Complex Technical Systems 1 article published in JoVE Environment A Guide to Concentration Alternating Frequency Response Analysis of Fuel Cells Antonio Sorrentino1, Kai Sundmacher1,2, Tanja Vidaković-Koch1 1Max Planck Institute for Dynamics of Complex Technical Systems, 2Process Systems Engineering, Otto-von-Guericke University Magdeburg We present a protocol for concentration alternating frequency response analysis of fuel cells, a promising new method of studying fuel cell dynamics.