Name: Low-PGM Cathode for AEM Water Electrolysis – HXP-ca (Pt/C, PtRu/C)
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HXP-ca — put precious metal where it matters, at 0.2 mgPGM/cm²

A low-PGM hydrogen-evolution cathode with Pt/C or PtRu/C on carbon paper and a low-roughness catalyst layer.

HXP-ca gives AEM electrolyser developers a clear catalyst choice within the same electrode architecture: PtRu/C for higher initial output or Pt/C for the stronger long-duration reference in HydroXpand's measured comparison.

0.2 mgPGM/cm²
Catalyst loading verified by XRF

Pt/C or PtRu/C
Two hydrogen-evolution catalyst options

260 ± 20 µm
Overall electrode thickness

10,000 cycles
Accelerated stress test completed

01 — Choose the catalyst by the priority

PtRu/C

Higher initial output in the measured cell comparison; lower long-duration stability in that same comparison.

Pt/C

Lower initial output in the measured cell comparison; stronger long-duration stability in that same comparison.

Loading convention

For PtRu/C, 0.2 mgPGM/cm² is the combined Pt + Ru mass.

02 — A controlled catalyst layer on carbon paper

Catalyst layer

Pt/C or PtRu/C with binder.

Gas-diffusion layer

Carbon paper.

Cross-section reference

Approximately 50 µm catalyst layer observed by SEM.

Area density

105 ± 10 g/m².

Surface

Low surface roughness to reduce local membrane damage.

03 — The catalyst trade-off is measured

Tafel slope

PtRu/C 45.7 mV/dec · Pt/C 52.2 mV/dec in three-electrode testing.

Single-cell current at 1.8 V

PtRu/C 0.61 A/cm² · Pt/C 0.43 A/cm².

Impedance at 2.00 V

PtRu/C 0.09 Ω·cm² · Pt/C 0.16 Ω·cm².

3-cell, 1,000 h reference

Pt/C 89 µV/h · PtRu/C 198 µV/h at 50 A.

Accelerated stress test

10,000 cycles completed at 1.0 ↔ 0.05 A/cm² with a 5 s cycle condition.

04 — Format, quality and supply

Standard format

200 × 300 mm; custom sizes can be reviewed.

Routine inspection

XRF sampling plus 100% visual inspection for folds, tears, contamination, bare areas and delamination.

Minimum order

One sheet · no minimum order value.

Lead time

Approximately two weeks for standard supply; up to two months for custom supply.

Storage

Cool, dry indoor storage away from direct sunlight.

05 — Where HXP-ca fits best

MEA programmes comparing Pt/C and PtRu/C under the same cell design

Low-PGM cathode development for AEM water electrolysis

Custom electrode sizing for HXS-0 research cells or reusable stacks

Projects that need the initial-performance and durability trade-off stated explicitly

06 — Build the RFQ around the catalyst decision

For a useful technical and commercial response, include:

Pt/C or PtRu/C and the priority between initial output and durability

Required size, active area, thickness and quantity

MEA structure and compression conditions

Electrolyte, temperature and current range

Inspection, documentation and delivery requirements

Start with the catalyst priority. HydroXpand will map it to the electrode format and test plan before quotation.

Data note: the figures above are measured under the stated half-cell, single-cell or 3-cell protocols. Results depend on the full MEA, cell hardware and operating conditions.

Low-PGM Cathode for AEM Water Electrolysis – HXP-ca (Pt/C, PtRu/C)