| Format | Single cell or custom short stack |
| Active area | Up to 25 cm², set by gasket |
| Reference condition | 0.3 M KOH at 60 °C |
| MEA access | HydroXpand and third-party MEAs |
| Build | Customisable |
| HXS-0 | Cell-scale material and MEA evaluation | Up to 25 cm² |
| HXS-2 | Reusable 2 kW 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 2 kW system with BOP and controls | 0.5 Nm³/h |
Data note: the performance graphic is an illustrative single-cell dataset, not a guaranteed performance claim. Final configuration and acceptance criteria are agreed per project.
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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