Fig. 2

Electrochemical properties of the in situ generated RuIrO_x catalyst. HER (a) and OER (b) polarization curves and the overpotentials at 10 mA cm⁻² of the electrocatalysts (insets) in 1.0 M KOH solution (left) and 0.5 M H₂SO₄ solution (right). Scan rate: 1 mV s⁻¹