AEM Water Electrolysis Stack – HXS-2 (2 kW)

Hydrogen production: up to 500 L/h (0.5 Nm³/h, approximately 1 kg/day)
Stack efficiency: 88% HHV at beginning of life (60 °C)
Continuous operation demonstrated for more than 2,400 hours (0.3 M KOH, 40 °C)
Power consumption: approximately 2 kW
Water consumption: 420 mL/h at 50 A
23 cells; 190 × 210 × 215 mm; 19 kg
Replaceable MEA with reusable stack hardware

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HXS-2 | 2 kW AEM Water Electrolysis Stack

A compact, serviceable stack for laboratory systems, pilot equipment and small-scale hydrogen projects.

HXS-2 combines HydroXpand's iridium-free anode, low-PGM cathode and reusable stack hardware in a standardised 23-cell platform. Replace the MEA while retaining the precision housing and balance hardware.

At a glance

Hydrogen output Up to 500 L/h (0.5 Nm³/h, approximately 1 kg/day)
Stack efficiency 88% HHV at beginning of life, 60 °C
Continuous operation More than 2,400 h demonstrated at 0.3 M KOH, 40 °C
Configuration 23 cells, replaceable MEA
Size / weight 190 × 210 × 215 mm / 19 kg

Why HXS-2

  • Demonstrated durability: more than 2,400 hours of continuous operation with crossover monitoring.
  • Uniform cell performance: average cell voltage 1.689 V with a standard deviation of 0.010 V across 23 cells.
  • Serviceable architecture: replace the MEA and reuse the precision stack hardware.
  • Integration-ready: compact format for research equipment and modular pilot systems.

Technical details

Operating condition 0.3 M KOH at 60 °C
Operating current 15–67 A, 50 A recommended
Water consumption 420 mL/h at 50 A
Active area 98 cm² anode / 79 cm² cathode
Power Approximately 2 kW

Choose the right HydroXpand platform

HXS-0 Cell-scale material and MEA evaluation Up to 25 cm²
HXS-2 Reusable stack for R&D and small pilots 0.5 Nm³/h
HXS-30 Pilot stack under validation 7.5 Nm³/h target
HXB-V1 Integrated system with BOP and controls 0.5 Nm³/h

Typical project scenarios

  • Research team running long-duration MEA and crossover studies
  • Balance-of-plant developer validating circulation, cooling and controls
  • OEM integrating a compact stack into a prototype hydrogen appliance
  • Small pilot project requiring around 1 kg/day of hydrogen

Include in your RFQ

  • Required hydrogen output or operating-current range
  • Temperature, pressure and electrolyte
  • Duty cycle and planned validation period
  • Integration interfaces, delivery schedule and quantity

Data note: performance depends on configuration and operating conditions. Request the applicable test protocol and full data package.

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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