Ligand-assisted soft-chemical synthesis of self-assembled different shaped mesoporous Co₃O₄: efficient visible light photocatalysts

Abstract

Mesoporous self-assembled cobalt oxide (Co3O4) of different shapes was synthesized by a facile soft-chemical process using cobalt nitrate, oxalic acid and phosphoric acid in the presence of cationic templates, cetyltrimethylammonium bromide, 1-butyl-3-methylimidazolium bromide, and pyridinium bromide at 75 °C/2 h followed by calcination at 300 °C. The effect of cationic templates of the samples on the physico-chemical properties, and the photocatalytic efficiency for the degradation of Chicago Sky Blue 6B was studied. Pyridinium bromide and 1-butyl-3-methylimidazolium bromide facilitated formation of particles with different shaped morphology compared to cetyltrimethylammonium bromide. The rod-like particles having higher surface area exhibited higher photocatalytic performance.

Seamlessly Conductive 3D Nanoarchitecture of Core–Shell Ni‐Co Nanowire Network for Highly Efficient Oxygen Evolution

“…The characteristic peaks at 191 and 517 cm −1 were attributed to the F 2g modes, and those that appeared at 473 and 666 cm −1 correspond to the E g and A 1g modes, respectively. Mode A 1g is related to the characteristics of the octahedral sites, and modes E g and F 2g correspond to mixed vibrations of the tetrahedral site and to octahedral oxygen motions, indicating that the crystalline structure of Ni‐Co nanowires was partially transformed to a spinel structure after the thermal annealing process . Moreover, Raman spectra of the CCS Ni‐Co Nws clearly show two broad peaks at 1365 and 1584 cm −1 ; these peaks correspond to the D‐band and G‐band, respectively.…”

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

“…5 Furthermore, hexagonal β-NiIJOH) 2 nanoplates with exposed (001) and (100) planes could be prepared via a microwave-assisted hydrothermal approach, and where the (100) planes showed more favorable electrochemical activity than the (001) planes. [13][14][15][16][17][18] It is noteworthy that Co 3 O 4 nanomaterials with different crystal planes exposed exhibit greatly different properties. [7][8][9][10][11][12] So far, Co 3 O 4 with different morphologies have been reported, such as nanocubes, nanoboxes, flower-like structures, nanorods, and porous structures.…”

“Design and Synthesis of 3D‐Ordered Mesoporous Co3O4 Nanostructures for Their Improved Supercapacitance and Photocatalytic Activity”

“…Hence, the recognized mechanism for the reduction of dye involves generation of electron holes, thus creation of electron‐hole pairs due to the transfer of electrons from the valence band to the conduction band through the band gap (Eg) as soon as photocatalyst is irradiated with light of suitable wavelength . The electrons and highly oxidative holes formed on the photocatalyst surface are thus trapped by oxygen and water, respectively, or by the surface adsorbed dye molecules . Thus, a photocatalyst allows facile migration of photogenerated charge carriers from the interior bulk to the surface, generally vital to inhibit hole‐electron recombination ,.…”