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Home
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Electrodes

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

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

  • Pt/C or PtRu/C catalyst layer on carbon paper
    PGM loading: 0.2 mgPGM/cm² by XRF
    Thickness: 260 ± 20 µm
    Area weight: 105 ± 10 g/m²
    Custom sizes up to 300 × 200 mm
    Low surface roughness for consistent membrane contact
    Tafel slope: 45.7 mV/dec (PtRu) or 52.2 mV/dec (Pt)
    Accelerated stress test: 10,000 cycles

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Description Vendor

HXP-ca | Low-PGM Dry Cathode for AEM Water Electrolysis

A titanium-free Pt/C or PtRu/C cathode with controlled catalyst loading on carbon paper.

HXP-ca combines a low-roughness catalyst layer with a dry-cathode architecture for custom AEMWE cells and reusable stacks.

At a glance

Catalyst optionsPt/C or PtRu/C
Catalyst loading0.2 mgPGM/cm², verified by XRF
Thickness260 ± 20 µm
Area density105 ± 10 g/m²
Maximum size300 × 200 mm

Why HXP-ca

  • Low PGM loading: 0.2 mgPGM/cm² supports efficient precious-metal use.
  • Two catalyst options: Pt/C and PtRu/C for application-specific HER requirements.
  • Membrane-friendly layer: controlled surface roughness helps reduce local membrane damage.
  • Custom format: dimensions can be adapted for research cells and reusable stacks.

Performance evidence

Tafel slope, PtRu/C45.7 mV/dec, three-electrode
Tafel slope, Pt/C52.2 mV/dec, three-electrode
Accelerated stress test10,000 cycles completed
Reference operation0.3 M KOH at 60 °C

Electrode pairing guide

HXP-anNiFe LDH anodeIridium-free OER electrode
HXP-caPt/C or PtRu/C cathodeLow-PGM dry cathode
HXS-0Research hardwareScreen the complete electrode/MEA set

Typical project scenarios

  • MEA team comparing Pt/C and PtRu/C cathodes
  • Research lab evaluating low-PGM dry-cathode operation
  • Stack developer sourcing custom electrode dimensions

Include in your RFQ

  • Pt/C or PtRu/C option and required dimensions
  • Cell active area and compression scheme
  • Operating and test conditions
  • Quantity, sampling and documentation requirements

Data note: the energy-use graphic is an illustrative single-cell dataset. Performance depends on the full cell configuration and test protocol.

HydroXpand Inc.

HydroXpand Inc. is a South Korean deep-tech company that develops and manufactures Anion Exchange Membrane Water Electrolysis (AEMWE) electrodes, cells, stacks, and integrated systems. Founded in 2023 by three KAIST PhDs, we work across catalysts, electrodes, stack architecture, balance-of-plant, and control software to reduce both upfront and lifecycle costs for clean hydrogen production.

Our current portfolio includes iridium-free anodes, low-PGM cathodes, single-cell and short-stack hardware, the HXS-2 2 kW stack, and the HXB-V1 2 kW integrated system. The HXS-30 30 kW pilot stack is under development and validation. HydroXpand products have been supplied to more than 50 customers across 10 countries, and our technology portfolio includes nine patents. The HXB-V1 is supported by a CE Declaration of Conformity.

Our stack architecture is designed so that the durable hardware can be reused while the MEA is replaced, reducing maintenance cost and material waste. Customers can start with laboratory or pilot-scale equipment today and expand through a modular development roadmap toward larger industrial systems.

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