Synthesis and catalytic property of facet-controlled Co₃O₄structures enclosed by (111) and (113) facets

Abstract

Co 3 O 4 microparticles, with many smooth quadrihedrons on the surface, were hydrothermally synthesized under the influence of EDTA 2− anions. Due to the excellent chelating and capping ability of EDTA 2− , the asobtained Co 3 O 4 microparticles were mainly enclosed by (111) and (113) facets or their equivalent facets. On the basis of condition-dependent experiments, a dehydration condensation reaction assisted by the limitation effects of EDTA 2− adsorbed on the surfaces of Co 3 O 4 was proposed to explain the growth process of the cubic crystalline Co 3 O 4 microparticles. The as-obtained Co 3 O 4 microparticles could catalyze the thermal decomposition of ammonium perchlorate (AP) effectively due to the exposure of the high energy facets.CrystEngComm This journal is

Sonocatalytic oxidation of EDTA in aqueous solutions over noble metal-free Co3O4/TiO2 catalyst

“…The proposed reaction mechanism depicted in Fig. 8 is confirmed by recently published data about strong interaction of EDTA molecules with Co 3 O 4 surface [27]. The observed low catalytic performance of Pt/TiO 2 catalyst in studied process can be explained by the difference in the reaction mechanism which involves adsorption of O 2 molecules at Pt surface in a first step instead of EDTA molecule in the case of Co 3 O 4 /TiO 2 catalyst [16].…”

Systematic shape evolution of Co3O4nanocrystals from octahedra to spheres under the influence of C2O42−and PVP

“…27 Co 3 O 4 micro-particles, mainly enclosed by {111} and {113} facets, were prepared under the influence of EDTA 2− anions. 28 And under the influence of both formamide and PVP, monodispersed and wellshaped wire-like Co 3 O 4 precursors were synthesized. 29 Furthermore, under the assistance of acetic acid, a series of single crystalline Co 3 O 4 nanoparticles with shapes of octahedra, corner-truncated octahedra, cubes, corner-truncated cubes and cuboctahedra were obtained by restructuring polycrystalline Co 3 O 4 microspheres.…”

Direct Visualisation of the Surface Atomic Active Sites of Carbon‐Supported Co3O4 Nanocrystals via High‐Resolution Phase Restoration

“…Finally, we report on the restored phase of a Co 3 O 4 nanocrystal viewed near a < 112 > projection (Figure 5). Indexing of the square modulus of the complex transform of the exit wavefunction (Figure 5 [55] however, there are limited reports describing DFT calculations for possible {113} surface terminations and their reactivity. Nevertheless, as mentioned earlier, defective surfaces are generally more reactive than flat surfaces.…”

“…The structure of the steps remains the same across the surface, as shown by the red dotted lines in Figure 5(b). Flat and defective Co 3 O 4 {113} surfaces have been previously observed experimentally; [55] however, there are limited reports describing DFT calculations for possible {113} surface terminations and their reactivity. Nevertheless, as mentioned earlier, defective surfaces are generally more reactive than flat surfaces [56,57]…”