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AFM and ToF-SIMS 2D mapping of the working electrodes containing nanoparticles: (a) AFM image of CeO2; ToF-SIMS 2D mapping of Ce+ (b) and CeO+ (c) on the as-made working electrode (WE) using CeO2 sequence stamping; similarly (d) AFM image of graphite; ToF-SIMS 2D mapping of C4H10+ (e) and C5H9+ (f) on the as-made WE using graphite mixing and stamping.
