Air purification unit and method for coating an electrode of an air purification unit

An air purification unit, comprising:

• at least one electric filter module configured to be flowed through by air to be purified and including at least one first electrode and at least one second electrode,
• wherein the air to be purified flows between the at least one first electrode and the at least one second electrode,
• wherein a first electric field is generatable between the at least one first electrode and the at least one second electrode by applying a high electric voltage provided by a power supply module, and
• wherein the at least one first electrode and the at least one second electrode form an ionizer;
• a mechanical filter module including at least one mechanical filter element arranged downstream of the electric filter module in a direction of a flow of the air to be purified;
• at least one third electrode provided in the mechanical filter element or in the mechanical filter module downstream of the mechanical filter element,
• wherein a second electric field is generatable between the at least one second electrode and the at least one third electrode by applying an electric voltage.