These products are nanoparticle metal and metal-oxide powders used as cathode catalysts for the electrochemical reduction of CO₂ (CO₂RR). At an electrolyzer cathode, electrical energy converts CO₂ into higher-value products, and the catalyst metal largely decides which one dominates. Silver (Ag) works mainly toward carbon monoxide (CO), tin (Sn) and bismuth oxide (Bi₂O₃) toward formate (the anion of formic acid), and copper (Cu) and copper oxide (CuO) toward products with two or more carbons (C₂₊), such as ethylene and ethanol.

The powder is not an electrode by itself; it is normally made into an ink and coated onto a gas diffusion electrode (GDE). Bi₂O₃, CuO and the oxide on Sn can be largely reduced to the metal under cathodic potential during operation, so the true active phase may differ from the starting powder. Each product comes in a 2 g bottle; electrode preparation and testing services are not included.

Key Features

Five catalyst families: Ag, Sn, Bi₂O₃, Cu and CuO nanoparticles
Ag → CO; Sn and Bi₂O₃ → formate; Cu and CuO → C₂₊ products (ethylene, ethanol, etc.)
Grade options: -H / -M for Sn, Bi₂O₃ and Cu, -S for CuO (selectivity classes)
Reference selectivity (manufacturer data): Ag ≥95%, Sn/Bi₂O₃ ≥80–90%, Cu ≥60–70%, CuO ≥65%
Particle size: Ag, Sn, Bi₂O₃, CuO ~50–80 nm; Cu ~30–50 nm
Powder form for preparing GDE inks; 2 g per bottle
Oxide catalysts can convert to metal in operation, so the active phase may differ from the starting phase

Technical Specifications

Product type	CO₂RR cathode catalyst (nanoparticle powder)
Materials	Ag, Sn, Bi₂O₃, Cu, CuO
Particle size	Ag, Sn, Bi₂O₃, CuO: ~50–80 nm / Cu: ~30–50 nm (reference only)
Ag NPs	Target product CO; reference selectivity ≥95%
Sn NPs-H / -M	Target product formate; reference selectivity ≥90% / ≥80%
Bi₂O₃-H / -M	Target product formate; reference selectivity ≥90% / ≥80%
Cu NPs-H / -M	Target product C₂₊; reference selectivity ≥70% / ≥60%
CuO NPs-S	Target product C₂₊; reference selectivity ≥65%
Reference test cell	Membrane electrode assembly (MEA) electrolyzer
Package	2 g / bottle
Notes	Selectivity values are manufacturer data and vary with test conditions; a small amount of CuOₓ may be present on the Cu NPs surface; catalyst/electrode preparation and testing services are not included
Handling note	Avoid inhaling nanopowders; use gloves and a dust mask, store sealed and dry

Available Options

Catalyst	Description
Ag NPs	Target product: CO; selectivity ≥95%; ~50 – 80 nm
Sn NPs-H	Target product: formate; selectivity ≥90%; ~50 – 80 nm
Sn NPs-M	Target product: formate; selectivity ≥80%; ~50 – 80 nm
Bi₂O₃-H	Target product: formate; selectivity ≥90%; ~50 – 80 nm
Bi₂O₃-M	Target product: formate; selectivity ≥80%; ~50 – 80 nm
Cu NPs-H	Target product: C₂₊ products; selectivity ≥70%; ~30 – 50 nm
Cu NPs-M	Target product: C₂₊ products; selectivity ≥60%; ~30 – 50 nm
CuO NPs-S	Target product: C₂₊ products; selectivity ≥65%; ~50 – 80 nm

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

Applications

Catalyst ink preparation and electrode coating work for GDEs
CO₂RR catalyst comparison studies (CO-, formate- and C₂₊-selective catalysts)
MEA (zero-gap) CO₂ electrolyzer testing
GDE flow-cell testing
Studying how oxide-derived Cu and Bi/Sn oxide catalysts transform during operation