PEM Water Electrolysis Electrodes (Power feeder / GDL / PTL)

TANAKA Precious Metals’ PEM Water Electrolysis Electrodes (Power Feeder, GDL, PTL)

• It is possible to choose substrates according to a balance of cost and performance (electrical conductivity, durability, and gas diffusion).
• We have a track record of platinum plating on different types of substrates, including expanded, micromesh, and porous (sintered fiber body and sintered powder body).

[Titanium expanded]

Features

• This is a relatively affordable substrate as it is widely distributed in the market. (minimum opening 2.0mm × 1.0mm)

[Titanium micromesh]

Features

• As the substrate surface is flat and smooth, it can be expected to mitigate physical damage when bonding with CCM.
• It is possible to create original designs for the opening size and arrangement.

[Titanium porous (sintered fiber body and sintered powder body)]

Features

• Using complex porous structures, gas supply homogeneity and such can be expected.

<Sintered fiber body>

<Sintered powder body>

Insoluble Electrodes

TANAKA Precious Metals’ Insoluble Electrodes

• We offer a variety of precious metal plating types—such as platinum plating, platinum-iridium alloy plating, and gold plating—as well as iridium oxide coating.
• Substrates can be processed into various shapes such as plates, rods, or made into terminals.
• We propose the most appropriate insoluble electrodes according to size, shape, and application.

<Examples of shape processing>

• 
  Plate
• 
  Mesh
• 
  Terminal
• 
  Cylinder

<Examples of membrane thickness>

• 
  Surface SEM image:
  Platinum 0.1µm
• 
  Cross-sectional SEM image: Platinum 30.0µm

Various Insoluble Electrode Applications

[Alkaline ion water purifier][Electrolyzed hydrogen water]

Features

• Through our unique processing technology, uniform platinum plating is possible even on thin membranes (Micro Plate).
• It has high durability in regard to the switching of polarity needed to prevent scaling of electrodes.
• It can be expected to have a longer life compared to generic coated sintered electrodes (according to in-house comparison).
• Large-volume mass production at low cost is possible using our automated mass production line.

	SEM ×1000	SEM-EDX Pt mapping
Micro Plate
Normal plating

Automatic mass production line

[Hypochlorous acid water][Acid water][Alkaline cleaning water]

Features

• We have a lineup of electrode catalysts, including platinum plating, platinum-iridium alloy plating, and iridium oxide. It is possible to choose electrodes according to the application from characteristics such as chlorine generation efficiency and polarity switching.

Product Lineup

Conceptual image of catalyst layer structure

• 
  KP #34
• 
  KP #72
• 
  KP #100

[Surface treatment anode]

Features

• Using a large plating tank, it is possible to carry out platinum plating of titanium substrates up to 1.8m × 1.2m.
• It is possible to reuse titanium substrates for recoating.
  * Platinum remaining on used electrodes may be traded in for a price.

Other Plating Technologies

[Plating of minute substrates]

Features

• It is possible to carry out plating of minute substrates, such as Φ3mm spheres.
  It is also possible to carry out barrel plating according to the size and shape.

• Φ3mm sphere
  
• Barrel plating line
  

[Precious metal plating of polymer membrane]

Features

• It is possible to carry out platinum plating (electroless plating) of polymer membranes.
• Applications are expected in the fields of electrolytic processing of water and water electrolysis

Plating of polymer membrane

• 
• 
  Plating range can be specified arbitrarily

[Platinum mesh]

Features

• It is possible to manufacture meshes with a platinum purity of at least 99.90% having holes of Φ3–4µm by applying electroforming technology.
• Nickel-free and conforms to the EU directive restricting the use of nickel (RoHS-compliant).
• There is a track record of use in medical nebulizers.

• Hole size Φ3–4µm