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a) SEM image of the plated Na metal (corresponding to 0.5 mAh cm−2 at a constant current of 0.5 mA cm−2) on Cu in 0.1 m NaBPh4/DME. b) Na1s narrow‐scan and c) wide‐scan XPS spectra of the Na metal plated in various electrolyte solutions (conventional electrolyte and 0.1 m NaBPh4/DME) compared to pristine Na metal.
