Zero Gap Technology

In the finite / narrow gap electrolyzer, there is a gap between anode and cathode surface to avoid high pressure on membrane which leads to increase in the cell voltage. Hence, to reduce the cell voltage by decreasing the gap between anode and cathode using the zero gap technology.

Purpose :

Reducing the gap between anode and cathode. In zero gap technology, both anode and cathode surfaces are in contact with the membrane, i.e. electrode gap equals to membrane thickness. Achieving uniform current distribution the original anode and cathode mesh are not fully flat; this is creating some non-uniformity in the current distribution. The elastic element can adjust its thickness following meshes profile, so the gap between anode and cathode is kept uniform.

Concept :

Zero Gap Technology totally removes the ohmic drop related to ionic movement through the Catholyte gap, by installation of a package of…

  • i.  Cathode screen which is used as current collector.
  • ii.  A fine cathode screen shifts up to gently touch the membrane.
  • iii.  In between them, durable elastic element is inserted, to transport electrons by contact from the current collector to the fine cathode screen, and capable of compensating for mechanical tolerances with no harm for the membrane.
Objective :
  • i.  Reduction of Cell Voltage in old finite / narrow gap cells.
  • ii.  Minimum modification at lower costs.
  • iii.  No changes in the original process.
Components :
  • i.  Nickel Mattress :  assuring a perfect “zero-gap” condition between cathode mesh and membrane.
  • ii.  Activated Nickel Flynet : fine woven mesh, activated with a MMO coating specific for “zero-gap” applications, positioned on top of the Nickel Mattress.
Benefits :
  • i.  Elastic element fills the gap between cathode & membrane.
  • ii.  Suitable for electricity conduct from current distributor to activated cathode.
  • iii.  Reduction in cell voltage & Low hydrogen evolution voltage cathode.
  • iv.  Reduction of the electric path between the Membrane and the cathode which will reduce the liquid electric resistance.
  • v.  Reduction of “bubble effect” by pushing the hydrogen gas bubbles on the rear.
  • vi.  No high pressure on membrane.
  • vii.  Elasticity can long last & durable performances in the life.
  • viii.  Obtaining more homogeneous current distribution through uniform gap between anode and cathode.
Zero Gap Retrofit
Zero Gap Configuration
Due for Matress Welding
Due for Fly Net Welding
Zero Gap Retrofitted