2 kW Reusable AEM Water Electrolysis Stack | HXS-2

HydroXpand Inc.

2 kW Reusable AEM Water Electrolysis Stack | HXS-2

2 kW Reusable AEM Water Electrolysis Stack | HXS-2

2 kW Reusable AEM Water Electrolysis Stack | HXS-2

2 kW Reusable AEM Water Electrolysis Stack | HXS-2

2 kW Reusable AEM Water Electrolysis Stack | HXS-2

2 kW / 50 A reusable 23-cell AEM stack
Hydrogen production: up to 500 L/h (approximately 1 kg/day)
H₂-side pressure: up to 10 barg (configuration option)
Beginning-of-life efficiency: 88% HHV at 0.3 M KOH and 60 °C
Latest continuous durability run: >2,400 h; approximately 77 µV/h/cell (0.3 M KOH, 40 °C and 50 A)
Reusable stack hardware with replaceable MEA
190 × 210 × 215 mm; 19 kg

HXS-2 — the reusable 2 kW AEM stack between cell testing and a complete system

Built for teams developing the balance of plant around a proven 23-cell stack platform.

HXS-2 gives research teams, system developers and OEMs a compact stack assembly for long-duration validation, integration work and lab-to-pilot projects. Replace the MEA set, retain the precision stack hardware and move into the next development cycle.

500 L/h Hydrogen production Approximately 1 kg/day	2 kW / 50 A Rated stack reference
10 barg Hydrogen-side pressure option	>2,400 h Latest continuous durability reference

01 — Built for repeatable development cycles

Configure	Define the MEA, pressure, electrolyte and interfaces for the validation plan.
Validate	Integrate the stack with the customer's fluid, power, sensing and control architecture.
Refresh	Replace the MEA set while retaining the reusable compression and balance hardware.

02 — A clear system boundary

Standard supply	HXS-2 reusable 23-cell AEM stack assembly with the stated mechanical, fluid and electrical interfaces.
Customer system	Power conversion, electrolyte circulation, cooling, gas treatment, sensing, safety and control.

03 — Evidence that stays with its test conditions

Rated output	Up to 500 L/h of hydrogen, approximately 1 kg/day.
Beginning of life	88% HHV at 0.3 M KOH and 60 °C.
Published durability graph	2,281 h at 0.3 M KOH, 40 °C and 50 A; approximately 80.2 µV/h/cell.
Latest continuous reference	More than 2,400 h under the durability protocol; approximately 77 µV/h/cell.

Protocol note: beginning-of-life efficiency and durability were measured under different conditions and must not be combined into one operating point. The currently recommended setup is 0.1 M KOH at 50 °C, subject to project configuration.

04 — Integration envelope

Cell count	23
Active area	100 cm² anode / 79 cm² cathode
Size / weight	190 × 210 × 215 mm / 19 kg
Operating temperature	Up to 80 °C
External circulation	4 L/min
Connections	Electrolyte 3/8" double-ferrule · H2 outlet 1/4" double-ferrule · M6 DC terminal

05 — Where HXS-2 fits best

Long-duration laboratory systems and crossover studies
Custom balance-of-plant prototypes
OEM integration into compact hydrogen equipment
Small pilots around 1 kg-H2/day
MEA replacement and validation programmes

06 — Build the quotation around the operating envelope

For a useful technical and commercial response, include:

Required hydrogen output or operating-current range
Pressure, temperature and electrolyte
Duty cycle and planned validation period
Fluid, electrical, sensing and control interfaces
Quantity, documentation package and delivery schedule

Start with the operating envelope. HydroXpand will map the appropriate stack configuration to the balance-of-plant concept before quotation.

Data note: performance depends on the complete MEA, configuration and operating conditions. Request the Rev05 data sheet and the applicable 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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