Amorphous Iridium Oxide (IrOx) Coated Electrode for Electrolyzer, CECEAIrO
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Iridium Oxide (IrO2/IrOx) coated Titanium Felt (or carbon paper) is the "gold standard" anode for Proton Exchange Membrane (PEM) water electrolyzers. Unlike alkaline systems that can use nickel, PEM systems operate at a very low pH (acidic) and high potentials, where almost all other metals—except titanium and noble metals—would rapidly corrode.
Iridium is the only element that offers the required balance of high OER activity and extreme electrochemical stability in acid. (1) Performance: A typical IrOx-coated Ti felt electrode achieves 10 mA/cm2 at an overpotential of 220–280 mV in acidic media (0.5 H2SO4). (2) Loading: To balance cost and performance, industrial targets aim for "low loading" of around 0.5 - 2.0 mg/cm2 of Iridium.
Titanium felt (also known as Titanium Fiber Paper) is the preferred Porous Transport Layer (PTL) for PEM anodes due to its unique physical properties: (1) Acid Stability: Titanium forms a stable, conductive passive oxide layer that prevents the bulk metal from dissolving in the acidic PEM environment. (2) Fiber Microstructure: The entangled titanium fibers provide much better electrical contact points for the catalyst layer than expanded metal mesh or sintered powder plates. (3) Porosity and Mass Transport: The high porosity (typically 60%–80%) allows water to reach the catalyst sites while simultaneously allowing oxygen bubbles to escape without causing "gas locking."
Carbon paper substrate shows the following features: (1) Superior Conductivity: Carbon has much higher electrical conductivity than the passive oxide-covered titanium, leading to lower ohmic losses. (2) Hydrophobicity Control: Carbon paper is often treated with PTFE (Teflon) to make it hydrophobic. This is crucial for gas-diffusion electrodes where you need to manage the balance between liquid reactants and gaseous products. (3) Thin Profile: Carbon paper is typically much thinner (100–300 um) and smoother than metal felts, allowing for a more compact and precise cell stack.
| Part Number |
CECEAIrO |
| Electrode Components |
Amorphous IrOx active material was chemically plated on the Ti felt or carbon paper. |
| Ti Felt Substrate |
Thickness: 250 um Porosity: 50-60 % Fiber diameter: 25-50 um Fiber length: 35 mm Special coating (eg: Pt, Au) on the substrate can be additionally supplied upon request. |
| Ti Mesh Substrate |
Thickness: 200 um Mesh pore: 1mm*2 mm |
| Carbon Paper Substrate |
Thickness: 190 um Porosity: 23 % Density: 0.44 g/cm3 Special coating (eg: Pt,) on the substrate can be additionally supplied upon request. |
| Loading Amount |
2 mg/cm2 |
| Electrode Dimension |
L 50mm * W 50mm |
| Package Size | 1 pcs/pack |
Notes: Please try to store the IrOx electrodes in a dry place.
References:
- M. Bernt, et al. Effect of the IrOx Conductivity on the Anode Electrode/Porous Transport Layer Interfacial Resistance in PEM Water Electrolyzers, J. Electrochem. Soc., 2021, 168, 084513.
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Z. Li, et al. Benchmarking of IrOx-Based Electrocatalysts for Water Electrolysis, Meet. Abstr., 2025, MA2025-02 1877.