Ir nanoparticles with ultrahigh dispersion as oxygen evolution reaction (OER) catalyst: synthesis and activity benchmarking

TY - JOUR

T1 - Ir nanoparticles with ultrahigh dispersion as oxygen evolution reaction (OER) catalyst

T2 - synthesis and activity benchmarking

AU - Bizzotto, Francesco

AU - Quinson, Jonathan

AU - Zana, Alessandro

AU - Kirkensgaard, Jacob Judas Kain

AU - Dworzak, Alexandra

AU - Oezaslan, Mehtap

AU - Arenz, Matthias

PY - 2019

Y1 - 2019

N2 - In this work, we present a facile and straightforward approach to synthesize, activate and benchmark small, i.e. 1.6 nm in diameter, Ir nanoparticles (NP) as oxygen evolution reaction (OER) catalysts. It is shown that the Ir NP, although oxidized after synthesis and drying, can be electrochemically reduced allowing determination of the electrochemically active surface area by CO stripping. Subsequently, an activation protocol is applied forming catalytically active Ir-oxide NP. This oxide formation is shown to be largely irreversible. It is then demonstrated that the activated Ir NP synthesized via our recently introduced colloidal method exhibit extremely high OER activities when normalized to their Ir mass. These high OER activities are related to superior dispersion as compared to state-of-the-art OER catalysts reported in the literature.

AB - In this work, we present a facile and straightforward approach to synthesize, activate and benchmark small, i.e. 1.6 nm in diameter, Ir nanoparticles (NP) as oxygen evolution reaction (OER) catalysts. It is shown that the Ir NP, although oxidized after synthesis and drying, can be electrochemically reduced allowing determination of the electrochemically active surface area by CO stripping. Subsequently, an activation protocol is applied forming catalytically active Ir-oxide NP. This oxide formation is shown to be largely irreversible. It is then demonstrated that the activated Ir NP synthesized via our recently introduced colloidal method exhibit extremely high OER activities when normalized to their Ir mass. These high OER activities are related to superior dispersion as compared to state-of-the-art OER catalysts reported in the literature.

U2 - 10.1039/c9cy01728c

DO - 10.1039/c9cy01728c

M3 - Journal article

SN - 2044-4753

VL - 9

SP - 6345

EP - 6356

JO - Catalysis Science and Technology

JF - Catalysis Science and Technology

IS - 22

ER -