Fig. 2
From: In situ observations of an active MoS2 model hydrodesulfurization catalyst
MoS2 edge structure in various gas environments. The bottom panels (d, e, f) show the original images, which were differentiated (in the fast scanning direction) to highlight the atomic contrast. The top panels (a, b, c) depict the averaged edge unit cell obtained from the bottom panels (d, e, f). The ball models represent the 100%S and 50%S structures that could directly be identified for (a) and (b), respectively, from comparison to simulated STM images (see Supplementary Figs. 1 and 2). Blue: Mo, yellow: S. a, d Catalyst after preparation in 2 × 10−6 mbar H2S at 450 °C, imaged in UHV at room temperature. 6.6 × 6.6 nm2, Ubias = −0.3 V, It = 560 pA. b, e Catalyst imaged in 1 bar H2 at 50 °C. 6.6 × 6.6 nm2, Ubias = −0.3 V, It = 630 pA. c, f Catalyst during the desulfurization of CH3SH in 1 bar 1:9 CH3SH/H2 at 250 °C. 8 × 8 nm2, Ubias = −0.3 V, It = 400 pA
