Find the answers you need before purchase

200 × 300 mm at 300 µm is a thin large-area sheet suited to electrode cutting, MEA fabrication and stack-level evaluation. 100 × 100 mm at 3 mm is a thicker small-area format for lab-scale testing, single-cell evaluation and catalyst screening. HXP-ca is 260 ± 20 µm thick at 200 × 300 mm, with a choice of Pt/C or PtRu/C. Catalyst loading is 0.2 mgPGM/cm²; for PtRu it is based on the combined mass of Pt and Ru. Standard formats ship in approx. 2 weeks; custom thickness or large sizes take up to approx. 2 months because of substrate procurement and synthesis.

We use HXB-V1 in house as a stack evaluation station, where it handles electrolyte flow, temperature control and data logging. However, its built in power supply is optimized for the operating window of our 2 kW stack, so voltage and current cannot be swept freely. For i-V curves or evaluation of low voltage short stacks and single cells, we recommend pairing it with a separate programmable power supply.

HXB-V1 is an electrolyzer: the power unit pushes current into the stack and it manages an alkaline electrolyte loop, temperature control and data logging. A fuel cell bench instead needs an electronic load that draws current, plus mass flow controllers, humidification and back pressure control, none of which are present. Owning a potentiostat does not substitute for the gas supply, humidification and back pressure hardware. If the goal is electrolysis cell or stack evaluation, we can propose a single cell or short stack setup instead.

HXS-0 uses a single-serpentine flow field as standard, and the flow-field geometry can be custom-made within the 1–25 cm² range for the test objective. HXS-2 and HXS-30 use bipolar plates made with dedicated tooling, so internal flow-field changes are not supported. Tell us your test objective and operating conditions and we will define either the HXS-0 custom scope or what can be evaluated with the production-stack flow field.

MEA is not included in the standard supply. On request it can be supplied with an MEA comprising HXP-an, HXP-ca and a membrane.

Higher flow is not impossible, but we have not operated and validated it ourselves, so we cannot guarantee performance or lifetime numbers there. The bottleneck is the internal flow field and manifold cross section rather than external piping, and higher flow raises the differential pressure, widening the anode to cathode pressure difference. If high flow is needed for an external process, we recommend separating a stack loop (approx. 4 L/min) from a process loop on a shared electrolyte tank.

A higher stack temperature carries more water vapour into the hydrogen. Since moisture is the main impurity, removing it with a dryer gave ≥ 99.999% within the operating range we have validated.

The HXB-V1 supports both 0 barg and 10 barg operation within one supply specification, and the required pressure remains selectable in the system software after delivery. These are not separate hardware configurations fixed at the time of order.

Electrolysis can begin before the electrolyte reaches its target temperature, so you do not have to wait for warm-up before hydrogen is available.

4 barg. In a fault condition the design routes hydrogen out through the vent line.

HXS-2 is a compression assembled stack, so it can be opened, disassembled and reassembled. Recovering performance reliably depends on compression and sealing, so we supply a reassembly guide. Performance and leak-tightness conditions after reassembly are agreed case by case.

Water is consumed during operation while the KOH itself is not. If H₂-in-O₂ crossover exceeds the control limit, or electrolyte condition and performance change, we recommend stopping for inspection and replacement.

Five stacked units reach roughly 10 kW, about 5 kg per day. Beyond that we propose a custom design around the HXS-30 stack. Tell us your required flow rate and daily operating hours and we will suggest a configuration.

There is no minimum order quantity, so a standard format can be ordered from a single sheet. Custom substrate procurement can take up to approx. 2 months, so it is faster to start with the standard 200 × 300 mm (300 µm) anode, which uses the same NiFe-LDH coating, and evaluate coating behaviour and stability first. Note that a standard format suits evaluation of the coating and OER performance rather than of the substrate itself. A custom quotation can be prepared in parallel. Where detailed performance data or test results need to be exchanged, we sign an NDA. We do not run a free sample programme.

The anode uses a non-precious-metal catalyst based on NiFe-LDH, while the cathode uses a Pt- or PtRu-based catalyst at 0.2 mgPGM/cm². We use several membrane and cathode-catalyst brands rather than being tied to one supplier, and disclose the configuration used in the delivered stack. HXP-an is synthesized in house, so replacements are supplied directly. You can later source parts yourself or order our electrode and MEA sets. Synthesis recipes and ionomer composition remain confidential.

STEP files for the stack and the 19 inch system enclosure are available, sent by link when the files are large. We can include dimensional data for installation planning as well.