Fig. 3From: Construction of Pd Single Site Anchored on Nitrogen-Doped Porous Carbon and Its Application for Total Antioxidant Level DetectionCharacterizations of the structural, compositional, and electronic properties of the SA-Pd/NPC sample. a XPS survey spectra of the SA-Pd/NPC; b–c XPS spectra for N 1 s and C 1 s regions of SA-Pd/NPC; d N2 adsorption–desorption isothermBack to article page