Shape-controlled synthesis of nanocubic Co3O4 by hydrothermal oxidation method

The addition of ortho-hexagon nano spinel Co 3 O 4 to improve the performance of activated carbon air cathode microbial fuel cell

“…The synthesis method of OHSNC was similar as previous study (Yang et al, 2007). In a typical synthesis, 15 mmol cobalt salt (Co(CH 3 COO) 2 Á4H 2 O) was dissolved into deionized water containing dispersant poly(ethylene glycol) 20,000.…”

Effect of Zirconia on Hydrothermally Synthesized Co3O4/TiO2 Catalyst for NOx Reduction from Engine Emissions

“…After that, zirconia promoted catalyst exhibited more stability and lost 5.03% weight compared to 6.67% of simple catalyst. Then, they were cooled to 169 • C in the presence of an air stream with same flow during which zirconia promoted catalyst gathered 1.87% and simple catalyst gathered 3.37% of weight which corresponds to oxygen gaining of both catalysts [36]. The OSC value (δ) of zirconia promoted catalyst was calculated to be 1.4 µmol/g and for simple catalyst it was 1.6 µmol/g which are quite significant values as per literature [39].…”

“…After addition of the zirconia in Co 3 O 4 /TiO 2 catalyst, it captures some of oxygen vacant sites of titania which results in a lower OSC value. weight which corresponds to oxygen gaining of both catalysts [36]. The OSC value (δ) of zirconia promoted catalyst was calculated to be 1.4 μmol/g and for simple catalyst it was 1.6 μmol/g which are quite significant values as per literature [39].…”

“…CeO 2 was used in conventional three way catalysts to overcome this fluctuating AFR issue as it has the ability to store/release oxygen during varying conditions. Zirconia with different mole fractions was added to give thermal stability and decrease sintering of CeO 2 [36]. In our case, we added 8 wt.% ZrO 2 in Co 3 O 4 /TiO 2 catalyst and investigated its effects on thermal stability and oxygen storage capacity of the catalyst.…”

Facile Synthesis of Co3O4 Cubic Structures and Evaluation of Their Catalytic Properties

“…[4] Co 3 O 4 , which has the typical spinel structure of a transition metal oxide, has been used as a support for noble metals in the activation of hydrocarbons. [5][6][7][8] A variety of different methods have been developed for the preparation of cobalt oxide nanoparticles, including the sol-gel, [9] microwave-assisted, [10] chemical vapor deposition, [11][12][13][14] chemical precursor route, [14] electrochemical synthesis, [15,16] spray pyrolysis, [17] and a simple reduction oxidation [18] methods. It is well known that the behaviors of nanophase materials are strongly dependent on the shapes and sizes of the particles, and the control of these properties is therefore critical to the ultimate performance and application of these materials.…”