Fig. 4: Mechanism investigations of the enhanced OER activity of RuO2-HEAE.
From: High-entropy RuO2 catalyst with dual-site oxide path for durable acidic oxygen evolution reaction
a Operando XANES of RuO2-HEAE during the OER process. b Relationship between normalized absorption edge energy during the OER process. c Schematic illustration of the in-suit DEMS. d, e DEMS signals of 32O2 [16O16O, mass/charge ratio (m/z) = 32], 34O2 (16O18O, m/z = 34), and 36O2 (18O18O, m/z = 36) from the gaseous products for 18O-labeled RuO2 (e) and RuO2-HEAE (f) catalysts in H218O aqueous HClO4 electrolyte. f, g In-suit ATR-SEIRAS for (g) RuO2 and (h) RuO2-HEAE. h Proposed OER mechanism for as-prepared RuO2-HEAE and RuO2, based on the Operando DEMS and ATR-IR measurements.
