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. 2023 Jan 10;95(1):319–356. doi: 10.1021/acs.analchem.2c05105

Figure 8.

Figure 8

(A) Photoelectrochemistry. The SECCM applied potential, E, is swept, as the illumination, P, of the substrate is switched on and off, resulting in the measured local current, i (traces, left). Photocurrent image of individual MoS2 particle obtained via SECCM (top right), and averaged dark currents (solid lines) and photocurrents (dashed lines) observed at points across the basal plane (red) and edge plane (green). Reproduced from Strange, L. E.; Yadav, J.; Garg, S.; Shinde, P. S.; Hill, J. W.; Hill, C. M.; Kung, P.; Pan, S. J. Phys. Chem. Lett.2020, 11 (9), 3488–3494 (ref (281)). Copyright 2020 American Chemical Society. (B) Electrocatalysis at layered Co(OH)2 plates. The oxygen evolution reaction (OER) current density as a function of position in scanning constant height mode for the particles shown on the right; the OER current density map obtained from hopping-mode SECCM movie at a series of voltage. Reprinted by permission from Macmillan Publishers Ltd.: Nature, Mefford, J. T.; Akbashev, A. R.; Kang, M.; Bentley, C. L.; Gent, W. E.; Deng, H. D.; Alsem, D. H.; Yu, Y. S.; Salmon, N. J.; Shapiro, D. A.; et al. Nature2021, 593 (7857), 67–73 (ref (206)). Copyright 2021. (C) Top left: EBSD map of polycrystalline gold, with inverse pole figure legend of surface orientation. The white rectangle indicates the location of SECCM measurements in CO2 atmosphere. Bottom left: Representative linear sweep voltammogram extracted from grains and grain boundary. Right: Equipotential snapshot at −1.05 V vs Ag/AgCl obtained from SECCM movie, displaying spatially resolved eCO2RR activity. The lattice rotation gradient ∂ω23/∂x and derived geometrically necessary dislocation (GND) map of grain boundary. Reprinted by permission from Macmillan Publishers Ltd.: Nature Materials, Mariano, R. G.; Kang, M.; Wahab, O. J.; McPherson, I. J.; Rabinowitz, J. A.; Unwin, P. R.; Kanan, M. W., Nat. Mater.2021, 20 (7), 1000–1006 (ref (237)). Copyright 2021. (D) Grain-resolved eCO2RR current density at −1.05 V vs Ag/AgCl plotted vs the corresponding average grain orientation relative to low-index orientation poles at polycrystalline Cu. Reproduced from Wahab, O. J.; Kang, M.; Daviddi, E.; Walker, M.; Unwin, P. R. ACS Catal.2022, 12 (11), 6578–6588 (ref (236)) under CC BY 4.0 license.