Proton Exchange Membrane (PEM) Electrolyzer Technology

PEM image 1

Our electrolyzer product is based on 60-year-old Proton Exchange Membrane (PEM) technology. Water is fed to the anode side (positive side) of the electrolyzer stack. Here, the water is split into its core constituents, which are hydrogen ions (protons), electrons and oxygen. The generated protons get conducted through the proton exchange membrane to the cathode side, where they react with electrons from the power supply and generate hydrogen gas. Our technology enables the design of compact electrolyzers, with a fast heat up and cool down over a short response time.

Our stack can sustain a differential pressure across the membrane without compromise. This feature supports the optimization of the compressor design with the aid of electrochemical compression as a part of the hydrogen generation. The use of a solid and thin electrolyte membrane leads to a shorter path for proton transport, thus minimizing ohmic losses. This in turn enables our electrolyzer to run at a very high current density and enhances cost-effective operation.

Lotus Mark 1 Product Specifications

Ohmium Product
Hydrogen Production

6 kg per hour


27.6 barg (400 psi)


Equal to or greater than 99.99%

(< 5 ppm of O2)

Requirements for System

2.7 SLPM (0.71 gpm) per building block*


480VAC / 415VAC, 60Hz / 50Hz


Outdoor rated for -25oC to +50oC (-13oF to 122oF)


Designed to UL 2264A (UL CCN NCBR) and ISO22734

Installed per NFPA 2


Outdoor rated | 6 kg H2/hr system consists of (2) primary cabinets,

(2) auxiliary cabinets

Each cabinet measuring (L x W x H) - 1.8m x 1.2m x 1.8m (6ft by 4ft by 6ft)

* Assuming less than 2000 µS/cm