Controlled Synthesis of Self‐Assembled Metal Oxide Hollow Spheres Via Tuning Redox Potentials: Versatile Nanostructured Cobalt Oxides

Abstract

A general method to produce self‐assembled metal oxides with hollow structures is developed by controlling the net redox potentials. Nanostructured CoOOH and CeO2 hollow microspheres have been successfully prepared by this method. The synthesized CoOOH hollow spheres are versatile precursors for nanomaterials of cobalt oxide derivatives (eg. Co3O4, LiCoO2), and also possess excellent catalytic activity.

Nano-sized Y2O3:Eu3+ hollow spheres with enhanced photoluminescence properties

“…Although template directing is the most straightforward method, this strategy suffers from many disadvantages including high cost and complicated procedures. Thus, one-pot and template-free methods are more attractive and feasible to produce hollow-structured materials [20][21][22][23][24]. Though many efforts have been exerted, it still remains a challenge to obtain hollow structures with uniform morphology and narrow size distribution.…”

Tuning the Morphology of Metal Oxides for Catalytic Applications

“…[124][125][126][127][128] Although the building blocks were nanocubes, nanorods, and nanosheets with very smooth surfaces ( Figure 10.5c-h), nanosheets usually have diameters of several hundred nanometers or even several microns ( Figure 10.6). [134][135][136][137][138][139][140][141][142][143][144][145] Hollow nanowires, nanotubes, nanoboxes, and nanocages have also been synthesized. 103,110,130,146 Template-directing, Ostwald ripening, oriented aggregation, and Kirkendall-type diffusion are the frequently used approaches in constructing these hollow structures.…”

One-pot hydrothermal synthesis of CeO2 hollow microspheres

“…To date, considerable efforts have been focused on the preparation of nanostructured CeO 2 [21][22][23], as well as hollow structures [24][25][26][27][28]. Titirici et al [24] fabricated CeO 2 hollow spheres using carbonaceous D-glucose as template.…”