Intrinsic electrocatalytic activity of a single IrOx nanoparticle towards oxygen evolution reaction.

摘要: Identifying the intrinsic electrocatalytic activity of an individual nanoparticle is challenging as traditional ensemble measurements only provide average over a large number nanoparticles and may be greatly affected by properties, irrelevant to itself. Here, single-particle collision electrochemistry used investigate single IrOx towards oxygen evolution reaction (OER). The frequency linearly proportional concentration. mean peak current transferred charge, extracted from spikes collision, present similar potential dependence relevant activity. turnover (TOF) determined 1.55 × 102 O2 s−1, which orders magnitude larger than TOFs reported systems. In addition, deactivation also explored based on half-width analysis spikes. This versatilely applicable method provides new insights into performance nanoparticle, essential reveal structure–activity relations nanoscale materials for rational design advanced catalysts.