Hydrogen Electrolyzer & Fuel Cell Manufacturing calculator
Catalyst Loading Cost Calculator
Estimate catalyst spend on a stack. Convert your loading (mg per cm squared) and active area into grams of catalyst per stack, then enter the metal price per gram (Pt, Ir, or PtRu), the catalyst utilization percentage during coating, and any fixed ink-prep or coater setup cost. The calculator returns the variable catalyst cost and a loaded total.
What this calculator does
- Estimate platinum, iridium, or PtRu catalyst spend per stack from grams of precious-metal catalyst per stack, the metal price per gram, the catalyst utilization in coating, and a fixed ink prep or coater setup cost.
- Use it when a process engineer is comparing catalyst loading recipes (for example 0.4 vs 0.2 mg Pt per cm squared) and needs to see the dollar impact per stack before committing to a coating change.
- It returns the catalyst spend on a single PEM electrolyzer, PEMFC, or SOEC stack, broken into variable metal-driven cost and a fixed coating program adder.
Formula used
- Variable catalyst cost per stack = catalyst metal per stack × metal price per gram × catalyst utilization
- Total catalyst cost per stack = variable catalyst cost + fixed ink-prep or coater setup cost
Inputs explained
- Catalyst metal per stack: Use cells × active area in cm² × loading in mg/cm² ÷ 1000 (for example 60 × 250 × 0.4 ÷ 1000 = 6 g of Pt for a PEMFC stack).
- Catalyst metal price per gram: Use the current Pt, Ir, PtRu, or alloy contract price per gram of metal, including refiner premium.
- Catalyst utilization in coating: Use the share of catalyst that ends up in the finished CCM after edge trim, overspray, and ink rejection (typical 80 to 95 percent for slot-die or spray coating).
- Fixed ink-prep or coater setup cost per stack: Add amortized ink batching, slot-die or spray coater setup, lot acceptance test, and qualification cost not captured per gram.
How to use the result
- Run it before signing off a CCM coating recipe change, before approving a new catalyst loading target, or when comparing in-house coating against a CCM purchase from an outside supplier.
- It does not capture support material (carbon, ionomer) or the cost of recovering Pt or Ir from coater-side scrap; pair with the platinum recovery value calculator for a net catalyst cost view.
Common questions
- How do I model both anode and cathode loadings on a PEM electrolyzer? Run the calculator twice: once for the anode (Ir loading at 1.0 to 2.5 mg/cm², Ir price per g) and once for the cathode (Pt loading at 0.2 to 0.5 mg/cm², Pt price per g), then add the two stack totals.
- What utilization values are realistic for slot-die or spray coating? Slot-die direct-coat on membrane runs 90 to 98 percent utilization. Decal transfer or roll-to-roll spray often runs 80 to 92 percent because of overspray, edge trim, and decal release loss.
- Should I include the carbon support and ionomer in the price per gram? No. The price per gram refers to the precious metal only (Pt, Ir, Ru). Carbon and ionomer cost is small in dollar terms; if you need them, fold the cost into the fixed ink-prep adder.
- My CCM is bought finished. Can I still use this calculator? Yes, but use the membrane electrode cost calculator instead. This one is built for teams that buy catalyst powder or ink and apply the loading themselves.
Last reviewed 2026-05-12.