An alternative way to couple an electrochemical interface to a heat transfer interface is by the use of the Electrochemical Heating multiphysics node that becomes available in the model builder tree under the
Multiphysics node if there is both a Heat Transfer interface and an Electrochemistry interface available in the same component. It defines a domain heat source in the heat transfer interface, based on the sum of irreversible (Joule heating and activation losses) and reversible heat in the electrochemistry interface. It also sets the temperature in the electrochemistry interface to equal the temperature dependent variable in the heat transfer interface.