A compromise between a reduced weight and material cost, without affecting the stability

Electrochemical reactors are very promising in the sustainable production of many chemicals. These contain one or more electrically connected electrochemical single cells.

When power density distribution over the current density distributor is irregular, a local ohmic over-potential can occur being relatively high, hampering the efficiency of the electrolytic cell. 
This lack of sufficient internal conductivity with conventional porous electrodes and gas diffusion electrodes has been solved by the introduction of current density distributors being conductive to a major part of the electrode structure. Frequently used current density distributors comprise a metal mesh, which is incorporated into the active, porous  layer of the electrode, where the electrochemical reaction is carried out.
Although the added value is well appreciated, cost considerations may lead to declining popularity, in particular when used in unipolar electrode setups. In addition, the high density nature of the metal wires may contribute significantly to the total electrode weight which may be considerable if a large current carrying capacity is envisaged.

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