Electrochemistry
Ir nanodendrites on ATO for acid OER
Open access · cc by · source: Europe PMC
TTAB-grown Ir nanodendrites on mesoporous ATO outperform Ir black for oxygen evolution in acid and in a PEM electrolyzer.
Key findings
Ir-ND crystallites are 1.7 nm versus 3.2 nm for Ir black; BET area is 39.2 versus 18.2 m2 g–1; electrochemical porosity is 34.2% versus 20%. Mass activity is 8 times Ir black at 1.51 V. Ir-ND/ATO reaches 1.50 A cm–2 at 1.8 V in the cell, versus 0.80 A cm–2 for Ir black, and is the most durable in 15 h chronopotentiometry.
Methodology
They reduced H2IrCl6 with NaBH4 in TTAB to make 15–20 nm Ir nanodendrites, deposited them on high-area ATO (or carbon), oxidized the surface electrochemically, and measured OER in 0.05 M H2SO4 and in a 5 cm2 PEMWE single cell.
Limitations
Long-term stack lifetime and Ir dissolution rates are not quantified beyond 15 h RDE holds. The 8-fold mass-activity claim is at one overpotential in liquid acid, not a full Tafel comparison across pH. Carbon-supported Ir-ND still faces support corrosion in PEM anodes.
How this study connects
Role on claims
Each row is a claim on a concept or method page where this paper supports, challenges, or qualifies the statement. Roles are hand-checked — not a model guess.
Not yet placed on a claim. This paper has study layers, but no concept page yet cites it as support, challenge, or qualifier.
Related papers in this topic
Same topic cluster — not a recommendation engine.