The low overpotential regime of acidic water oxidation part I: the importance of O2 detection
EC-MS extends OER activity measurement on Ru-based catalysts across six orders of magnitude down to 1.30 V_RHE — revealing a previously unobserved Tafel slope of 25 mV dec⁻¹ below 1.4 V. A microkinetic model fits the expanded dataset, and the results show how onset potential and exchange current density are artefacts of detector sensitivity.