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.
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Ir nanodendrites on ATO for acid OER
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Ir-ND particles are 15–20 nm by TEM
The low resolution TEM image of the as-synthesized material revealed a largely dendritic structure with a narrow size range of 15–20 nm () and high-yield formation.
Crystallite size of Ir-ND is 1.7 nm versus 3.2 nm for Ir black
The crystallite size of Ir-ND and Ir black was estimated to 1.7 nm and 3.2 nm, respectively.
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.
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