Gas Diffusion Electrode (GDE) Flow Electrolyzer with Ultrathin Electrode Frame (~1mm) for Electrosynthesis of Hydrogen Peroxide and Formate, CEHPFGDEFEUEF

In a GDE (Gas Diffusion Electrode) flow electrolyzer, the "ultrathin electrode frame" is a critical architectural desgin to manage the gas-liquid biphase reaction, where gaseous reactants (like CO2) must meet liquid electrolytes and solid catalysts at a perfectly balanced triple-phase boundary.

Traditional flow cell frames are often bulky (several millimeters thick), which increases the distance between electrodes and adds ohmic resistance. The shift to ultrathin frames (typically 0.5–1.2 mm) provides several key benefits: (1) Zero-Gap Proximity: It minimizes the "gap" in the electrolyte chamber, allowing the system to operate at industrial current densities (>500 mA/cm2) with lower voltage penalties. (2) Stray Current Mitigation: Modern frames use high-performance polymers like PEEK or PPS with integrated feed/discharge channels designed to reduce stray currents that can lead to power loss and hardware deterioration. (3) Precision Compression: The thinness allows for more uniform mechanical pressure across the GDE, ensuring that the fragile porous layers aren't crushed while maintaining airtight seals for the gas phase.

The O2-to-H2O2 reaction is highly dependent on mass transport, making the "Flow-By" GDE configuration essential. Gas Phase: Pure O2 or filtered air is fed to the back of the GDE. This solves the problem of oxygen's low solubility in water, allowing for current densities of 200–800 mA/cm2. Liquid Phase: A dilute electrolyte (often 0.1 M Na2SO4 or seawater) flows past the catalyst-coated side of the GDE. High flow rates are used to "sweep" the H2O2 away as soon as it forms to prevent it from being further reduced to water.

The three compartment design with two membranes can be used to catholyte, anolyte, and gas chambers, which allows the direct production of liquid formic acid (HCOOH) without salt contamination.

Part Number	CEHPFGDEFEUEF (C-EHPF-GDEFEUEF)
Structure/Components	Current Collector/Flow Channel: One piece of SS316L or Ti Electrode Gasket: PTFE Tubing Connection: Barbed hose fitting (connecting tube I.D. 2 mm)  M4 tighten screw (8 pieces) Ultrathin Electrode Frame (~1 mm)
Cell Sizes	Default effective area is 2.0 cm * 2.0 cm (4.0 cm2)  Other types of active areas, such as (1.6cm * 1.6cm) (3.2cm * 3.2cm), (5 cm * 5cm) are also available upon request.   Cell size: W60×H70 mm
Flow Channels	Standard flow channel is Serpentine                Other flow channel types: such as interdigital, parallel serpentine are also available upon request.
Assembling Diagram
Heating Function (Optional)	The heating controller can be integrated with the "heating" version flow cells.
Flow Pump (Optional)	The flow pump can be supplied upon request
Note	The cell components should be thoroughly cleaned and dried after use.