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TEM images of ceria nanopowder at the same magnification prepared under oxygen atmosphere (a,b) and nitrogen atmosphere (c,d) using two different cerium precursors (cerium nitrate and cerium chloride). (e–j) TEM images of ceria nanostructures using cerium nitrate as precursor and ammonium chloride as surfactant agent with varying the Cl– amount: (e) 1 mmol, (f) 2 mmol, (g) 3 mmol, (h) 4 mmol, (i) 6 mmol, (j) 8 mmol. Reprinted/adapted with permission from Ref. [26]. 2018, Elsevier.
