Fig. 2: The spillover processes on stripe-like MnO/Pt(111) and grid-like Mn₃O₄/Pt(111) surfaces.

a, b XPS O 1s spectra of stripe-like MnO and grid-like Mn₃O₄ surfaces exposed to different amount of D₂ at room temperature. A time-lapse sequence of STM images of (c–h) stripe-like MnO and (i–n) grid-like Mn₃O₄ in H₂ atmosphere at room temperature. Insets in (e) and (k) show atomic-resolution STM image of partially hydroxylated stripe-like MnO surface and partially hydroxylated grid-like Mn₃O₄ surface, respectively. The partial pressure of H₂ atmosphere from (d) to (h) is ~2 × 10⁻⁸ mbar, and from (j) to (n) is 2.5 × 10⁻⁷ mbar. The exposure time is stamped in the lower left corner. Scanning parameters: (c, d) I_t = 0.090 nA, V_s = 0.831 V; (e–h) I_t = 0.090 nA, V_s = 0.937 V; inset in (e) I_t = 0.360 nA, V_s = 0.008 V; (i) I_t = 0.100 nA, V_s = 1.030 V; (j–n) I_t = 0.110 nA, V_s = 1.030 V; inset in (k) I_t = 0.100 nA, V_s = 0.019 V.