Knitted Mesh for Electrolytic Hydrogen Production & Chlor-Alkali Production

In hydrogen production industry, knitted mesh is often used in polymer electrolyte, proton exchange membranes (PEM), ion exchange membranes (IEM) and also in the extremely harsh conditions associated with alkaline zero-gap electrolycer applications.

  • Common Knitted Mesh Products
    • Flat knitted mesh. It is a high tensile, flexible material consisting of a series of interlocking metal wires or wire loops.
      A caliper is used to check the wire diameter of flat knitted mesh.

      Flat knitted mesh wire diameter inspection

      A tapeline is used to check the aperture of flat knitted mesh.

      Flat knitted mesh aperture inspection

    • Compressed knitted mesh. Various wires are knitted by knitting machine and then compressed by special equipment.
      A tapeline is used to check the diameter of compressed knitted mesh.

      Compressed knitted mesh diameter inspection

      A try square is used to check the thickness of compressed knitted mesh.

      Compressed knitted mesh thickness inspection

    • Crimped knitted mesh. When the knitted mesh production is finished, special process is adopted to produce crimped knitted mesh, forming waveform profiles.
      A roll of unfolded crimped knitted mesh

      Crimped knitted mesh

      Observe the crimped knitted mesh from a close distance.

      Crimped knitted mesh details

    • Tinned copper knitted mesh. The copper wire surface is coated with a thin layer of metal tin to prevent copper wire from being exposed to the air, easily oxidized and form verdigris. The verdigris has poor electrical conductivity and will increase the electrical resistance.
      A roll of tinned copper knitted mesh

      Tinned copper knitted mesh

      A caliper is used to check the wire diameter of tinned copper knitted mesh.

      Tinned copper knitted mesh wire diameter inspection

  • Roles of Knitted Mesh in Hydrogen Production Industry
    • Work as electrode material for hydrogen production from electrolytic water to improve electrolysis efficiency and stability.
    • Act as catalyst carrier for fuel cells to enhance the dispersion and activity of catalyst.
    • Function as filter material for hydrogen to remove impurities and moisture and improve the purity of hydrogen.
    • Work as storage material for hydrogen and take advantage of porous structure to absorb and release hydrogen for low pressure hydrogen storage.
  • Advantages of Knitted Mesh in Hydrogen Production Industry
    A coiled spring wire

    Flexible & Malleable

    A shield with a wave

    Energy Absorbing

    3 upward arrows

    Variable Porosity

    A cloud with lightning

    Harsh Environments

    2 springs are intertwined.

    High Resilience

    A weight marked with KG

    High Strength

    A lock is embedded in a shield.

    Encapsulates & Protects

    Electromagnetic signals are shielded.

    EMC & RFI Shielding

    A pocket with a money symbol

    Cost Efficient

    A button box with positive and negative anodes

    Electrically Conductive

    A leaf with water drops falling off

    Environmentally Friendly

    3 pipes are stacked together.

    Material Versatility

    Calculate the shaded area.

    High Surface Area

  • Properties of Knitted Mesh in Hydrogen Production Industry
    • Electrical Resistance

      In the process of hydrogen production, electrical resistance within electrolyzers reduces their efficiency and increases operating costs. In conventional designs, knitted mesh is in direct contact with bipolar plates, expanded metal and other additional components.

      In response to the industry drive for enhanced efficiency, Boedon adopts mesh-jointing technology to weld knitted mesh to every contact point of metal plate or adjacent components (bipolar plates, expanded metal, etc.) to form a single bonded structure.

      This welding process produces an homogenous joint that reduces internal cell resistance while significantly improving electrical conductivity.

      The relations between knitted mesh voltage and current density

      Knitted mesh voltage vs current density

      The relations between knitted mesh resistance and pressure

      Knitted mesh resistance vs pressure

    • Mechanical Performance

      Compressed knitted mesh lately developed by Boedon can effectively extend the service life of electrolyzers and maintain stable operation under thermal cycle and harsh working conditions. It has outstanding levels of resilience and can resistant compressibility losses through load cycling. The 2 charts below display the compression range and performance changes of compressed knitted mesh.

      The relations between knitted mesh load and compression

      Knitted mesh load vs compression

      The changing curve of knitted mesh under load cycling conditions

      The change of knitted mesh under load cycling conditions