Table 1. Precursors for the synthesis of Ir nanoparticles (Ir-nano).

Catalyst name	Solvent	Reductant	Ir precursor
Ir-nano 99.8	≥99.8% pure EtOH a	1× NaBH4	IrCl3 b
Ir-nano 99.8-P	≥99.8% pure EtOH	5× NaBH4	IrCl3
Ir-nano 99.5	≥99.5% pure EtOH c	1× NaBH4	IrCl3
Ir-nano 99.5\CTAB	≥99.5% pure EtOH, without CTAB d	1× NaBH4	IrCl3
Ir-nano 91.5	≥91.5% pure EtOH e	2× NaBH4	IrCl3
Ir-nano H2O	DI water H2O f	2× NaBH4	IrCl3

^aEthanol absolute, water free (VWR Chemicals, product-no. 83672), purity ≥99.8%. Reference synthesis: 0.448 g IrCl₃/5.265 g CTAB/0.684 g NaBH₄/855 ml EtOH.

^bIridium(iii)-chloride, dried, min. 62% Ir (Alfa Aesar, product-no. 12158).

^cEthanol absolute (VWR Chemicals, product-no. 20816), purity ≥99.5%.

^dCetyltrimethyl ammonium bromide (VWR Chemicals, product-no. 22610.132).

^eEthanol 99% (VWR Chemicals, product-no. 84835), purity ≥91.5%.

^fWater (VWR Chemicals, product-no. 90200), conductivity ≤1.1 μS cm^–1.