Fig. 2

SEM images, EDAX analysis, and dot mapping analysis for Bare-GCE (A, B, and C), MIL-156 MOF@COF-GCE (D, E, and F), and Au-MIL-156 MOF@COF-GCE (G, H, and I), respectively.

SEM images, EDAX analysis, and dot mapping analysis for Bare-GCE (A, B, and C), MIL-156 MOF@COF-GCE (D, E, and F), and Au-MIL-156 MOF@COF-GCE (G, H, and I), respectively.