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.

You can also use the heat source variables defined by the electrochemistry interfaces when setting up manual heat couplings between different components in a model. For instance if you are using a 1D electrochemical cell model to calculate an average heat source in a 3D heat transfer model. The names of the heat source variables are xxx.Qh (domain, Joule heating and porous electrode reactions) and xxx.Qbfc (boundary, electrode surface reactions), where xxx is the electrochemistry interface identifier.