Hydrotalcite-derived aluminum-doped cobalt oxides for catalytic benzene combustion: Effect of calcination atmosphere

High-Efficiency Electrochemical Nitrate Reduction to Ammonia on a Co3O4 Nanoarray Catalyst with Cobalt Vacancies

“…The very small change is ascribed to the similar ionic radii of Al 3+ (0.0535 nm) and Co 3+ (0.0545 nm). 40 The main characteristic peaks of v Co -Co 3 O 4 /CC (Figure 1a) also match well with the spinel Co As shown in Figure 1g, the Raman spectrum of Co 3 O 4 /CC exhibits five peaks located at 682, 612, 518, 476, and 192 cm −1 , corresponding to the typical Raman-active modes of A 1g , F 2g , F 2g , E g , and F 2g , respectively. 43 Notably, the red shift of characteristic peaks for v Co -Co 3 O 4 /CC demonstrates the shortrange order of the crystalline structure.…”

“…Locally enlarged XRD patterns (Figure S1b) clearly display a small shift to a higher angle in Al-Co 3 O 4 /CC compared to Co 3 O 4 /CC, which reveals a decrease in lattice parameter after Al doping. The very small change is ascribed to the similar ionic radii of Al 3+ (0.0535 nm) and Co 3+ (0.0545 nm) . The main characteristic peaks of v Co -Co 3 O 4 /CC (Figure a) also match well with the spinel Co 3 O 4 phase, and it suggests that the etching process does not change the crystal phase of v Co -Co 3 O 4 /CC.…”

“…For v Co -Co 3 O 4 /CC, similar fitting peaks can be observed, whereas the binding energy of O 1s is about 0.9 eV higher than that of Co 3 O 4 /CC, and O surface is significantly larger than that of Co 3 O 4 /CC. This suggests that the etching of Al 3+ changes the electronic state and causes the surface defect with a large concentration . In addition, the band position and work function of v Co -Co 3 O 4 were surveyed by ultraviolet photoelectron spectroscopy (UPS).…”

Enhancing Catalytic Performance with Sol‐Gel Hydrotalcite‐Derived Nickel Oxide Catalysts for Dry Reforming of Methane: An Examination on Reactivity and Coke Formation

“…Nickel is an economical catalyst for dry reforming of methane, but it is sensitive to deactivation by carbon deposition, which can be reduced by using dopants or support modifications. [2,3] Hydrotalcites, composed of brucite obtained through cation exchange and hydrogen bonding, [4][5][6][7] have improved catalytic performance in reforming reactions. [8][9][10][11] Hydrotalcites can exhibit rhombohedral or hexagonal symmetry and have applications in heterogeneous catalysis and organic synthesis.…”

Calcination-controlled performance optimization of iron–vanadium bimetallic oxide nanoparticles for synergistic tumor therapy

“…[14][15][16] Previous studies have shown that calcination in different atmospheres often leads to changes in the structure and properties of metal oxide nanomaterials. [17][18][19] This difference often leads to completely different application values of these nanomaterials in electrochemistry, 20,21 environmental protection, 22,23 catalytic activity, 24,25 etc. However, few people investigated the performance differences of transition metal oxide nanomaterials formed in different calcination atmospheres for biotherapeutic applications.…”