Fig. 2: Homogenize electric field and XPS spectra of MES.
From: Building electrode skins for ultra-stable potassium metal batteries
a AFM images of Cu foil surface and F-GO. b Surface electric field and corresponding ion distribution of the pole piece electrode during initial K plating. c XPS survey spectrum. d, e The high-resolution XPS spectrum of GO. f–h The high-resolution XPS spectrum of F-GO. i Infrared spectrum of GO, F-GO and F-GO after the cycles. j, k The high-resolution XPS spectrum of F-GO after the cycles.
