HXS-2 Specifications and reference

What the HXS-2 is for, how it looks, its specifications, and the terms used in this handbook.

On this pageIntended use

Intended use
Product view
Specifications
Terms
Manufacturer

Intended use#

The HXS-2 is a stand-alone 23-cell, 2 kW AEM water electrolysis stack. It makes hydrogen once integrated with your DC power, electrolyte circulation, gas-liquid separation and safety systems. Everything before and after the stack is in your design scope.

Product view#

HXS-2 stack in perspective: cells stacked between square end plates — Figure 7-1 The HXS-2. For the ports and DC terminals, see figure 3-1 in Quick start.

Specifications#

The specifications below are the same values as the product page and datasheet. They are beginning-of-life values unless stated otherwise.

H₂ production: 500 L/h · 1 kg/day (at rated 50 A)
Efficiency (HHV): 90.0% (BOL · 0.1 M KOH · 50 °C · ambient pressure) · 44 kWh/kg-H₂
Long-run validation: More than 3,000 hours of cumulative operation (23 cells) · long-run data and test conditions in the durability note
Rated operating condition: 0.1 M KOH · 50 °C (adjustable)
Operating temperature: Up to 80 °C
Energy use: 2 kW (at 50 A)
Water consumption: 420 mL/h (50 A)
Number of cells: 23
Active area: 100 cm² (anode) / 79 cm² (cathode)
Dimensions: 190 × 198 × 215 mm
Weight: 19 kg
Structure: NiFe anode · Pt/C or PtRu/C cathode · AEM
Fluid ports: KOH IN 3/8″ PEEK tube · O₂+electrolyte OUT 3/8″ PEEK tube · H₂ two ports 1/4″ double-ferrule
DC terminals: M6 · torque 4–6 N·m
External circulation: 4 L/min (standard)
Instrument calibration: Flow and gas analysers calibrated under KOLAS
End plate: SUS316L
Bipolar plate: Nickel-based metallic plate
Material change: Yes · we confirm the operating window and validation scope together

Terms#

Term	Meaning
AEM	Anion exchange membrane: a membrane that passes hydroxide ions (OH⁻).
KOH	Potassium hydroxide, used as a 0.1 M solution for the electrolyte.
DI water	Deionised water. Quality is judged by conductivity (µS/cm at 25 °C).
MEA	Membrane electrode assembly: the electrodes and membrane that make up the heart of a cell.
BoP	Balance of plant: everything around the stack, such as power, pumps, tank, heat exchanger, piping, sensors and controls.
barg	Gauge pressure in bar, relative to atmosphere.
NL/h	Gas volume per hour in litres at standard conditions (0 °C, 1 atm).
BOL	Beginning of life. Specifications are BOL values unless stated otherwise.
SDS	Safety data sheet. Check it before handling KOH.

Manufacturer#

Manufacturer: HydroXpand Inc.
Address: 3F, 59 Dongtansandan 6-gil, Hwaseong-si, Gyeonggi-do 18487, Republic of Korea
Contact: +82 70-4110-1201 · [email protected] · hydroxpand.com

What this chapter is based on

HXS-2 datasheetPDF · 1.5 MB
HXS-2 outline drawingPDF · 493 KB
Stack integration guidePDF · 709 KB
HXS-2 user manualPDF · 4.2 MB

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