Figure 12.

a Schematic presentation fabrication of single-shelled, double-shelled and triple-shelled cobalt precursors in the presence of PVP templates; b TEM image of single-shelled cobalt glycolate; c TEM image of double-shelled cobalt glycolate; d TEM image of triple-shelled cobalt glycolate [50]. Copyright Wiley–VCH Verlag Gmbh & Co. KGaA. Reproduced with permission