Silver (Ag) GDE Cathode - CO₂RR (10 × 10 cm²)

The Silver (Ag) gas diffusion electrode (GDE) is a 10 × 10 cm electrode used on the cathode side of a CO₂ electrolyzer. A GDE is a porous electrode that lets gaseous CO₂ reach the catalyst directly, avoiding the current limit caused by its low solubility in water (hundreds of mA cm⁻² are possible). Silver is a classic metal catalyst that reduces CO₂ mainly to carbon monoxide (CO); hydrogen can form as a side product. Manufacturer reference selectivity is ≥95%.

The model code selects the option: CB standard, CT better stability, U enhanced gas transport, H enhanced flooding resistance. No solid-electrolyte (X) version is offered for this electrode. Flooding means electrolyte fills the pores and blocks CO₂, raising hydrogen formation. Catalyst loading is about 1 mg cm⁻² (manufacturer data); reference performance was measured in an MEA electrolyzer.

Key Features

• Target product: CO; reference selectivity ≥95% (manufacturer data)
• Gas-diffusion structure: CO₂ reaches the catalyst from the gas phase, suited to high-current-density operation
• 10 × 10 cm size; catalyst loading ~1 mg cm⁻² (manufacturer data)
• Standard (CB) and better-stability (CT) options
• Enhanced gas transport (U) and enhanced flooding resistance (H) options; combined versions (CBUH, CTUH)
• High CO Faradaic efficiency on Ag cathodes in zero-gap cells is reported in the literature; anolyte concentration, temperature and pressure affect the result
• Reference performance measured in an MEA electrolyzer; may vary with conditions

Technical Specifications

Available Options

For sizes and specifications not listed above, you can request a custom quotation through the Quote Form.

Applications

• CO₂RR MEA (zero-gap) electrolyzer testing
• GDE flow-cell studies
• Comparing stability and flooding behavior across CB / CT / U / H options
• Screening operating parameters such as anolyte/cation type, temperature, pressure and CO₂ flow
• Optimizing cell and operating conditions for CO production