Argonne maps iridium surface, Ir(111) beats Pt for H2
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- Argonne National Laboratory used cyclic voltammetry, CO probing, and nano‑antenna Raman spectroscopy to track hydrogen, oxygen, and hydroxyl species on iridium surfaces under varying voltages.
- Iridium crystal facets Ir(111), Ir(100), and Ir(110) displayed distinct adsorption behaviors, with each facet’s atomic arrangement influencing how water‑derived species bind and rearrange.
- Raman spectroscopy with gold‑nanoparticle nano‑antennas revealed over 20 unique vibrational markers, providing moment‑by‑moment insight into surface chemistry that previous techniques missed.
- Ir(111) was found to outperform platinum for both hydrogen evolution and hydrogen oxidation reactions, indicating higher catalytic activity for hydrogen production and fuel‑cell use.
- Iridium generated far less hydrogen peroxide during the oxygen‑reduction reaction, a benefit for fuel‑cell durability.
- The research team noted that the experimental and simulation approach can be applied to other electrolytes and electrode materials, extending the insights beyond water‑based systems.
Why it matters: Electrochemical manufacturers of hydrogen fuel, chlorine, and metal extraction gain a clearer blueprint for designing more efficient and durable catalysts, while reliance on platinum‑based systems may decline as iridium’s superior facet‑specific activity reduces peroxide‑induced degradation, lowering operating costs and extending the lifespan of fuel‑cell stacks and electrolyzers.
