Review on recent progress in hydrothermally synthesized MCo2O4/rGO composite for energy storage devices

Efficient Electrochemical Hydrogenation of Nitroaromatics into Arylamines on a CuCo2O4 Spinel Cathode in an Alkaline Electrolyte

“…37-0878, and ZnCo 2 O 4 JCPDS no. 23-1390, all with space group Fd 3 m ). − The peaks of MCo 2 O 4 (M = Mn, Fe, Cu, and Zn) were slightly shifted as excepted compared with pure Co 3 O 4 due to the substitution of larger size M cations in the crystal structure. , The photograph, SEM data, and EDS elemental mapping images of MCo 2 O 4 /NF (Figures b–f, S1–S3) obtained at different magnifications revealed that the nickel substrate was covered with nanosheets (M = Fe) or nanowire arrays (M = Mn, Co, Cu, Zn), which provides a large surface area and mass transportation channels for cathodic reactions.…”

“…52,53 In Zn 2p, the peaks at 1021.1 and 1044.2 eV can be characterized as the Zn 2+ oxidation state (Figure 2d). 49 The Co 2p 3/2 peak in synthesized Co 3 O 4 /NF suggests that Co exists predominantly in the form of Co 3+ (779.5 eV) and Co 2+ (780.9 eV) (Figure S4). 54 The XPS spectra of Co 2p in MCo 2 O 4 /NF (M = Mn, Fe, Cu, and Zn) also show a mixed valence of Co 2+ and Co 3+ (Figure S5).…”

“…The two satellite peaks confirm the presence of Cu 2+ . Moreover, the Cu 2p 3/2 curve has spin–orbit splitting at 933.68 and 935.61 eV, which corresponds to the coexistence of octahedral Cu 2+ and tetrahedral Cu 2+ , respectively. , In Zn 2p, the peaks at 1021.1 and 1044.2 eV can be characterized as the Zn 2+ oxidation state (Figure d) . The Co 2p 3/2 peak in synthesized Co 3 O 4 /NF suggests that Co exists predominantly in the form of Co 3+ (779.5 eV) and Co 2+ (780.9 eV) (Figure S4).…”

“… The XPS spectra of Co 2p in MCo 2 O 4 /NF (M = Mn, Fe, Cu, and Zn) also show a mixed valence of Co 2+ and Co 3+ (Figure S5). − , …”

Three-Dimensional Nb Nanopillar based Electrode for Energy Storage Devices

“…Current global economic conditions make it essential that energy resources should not be consumed excessively. Environmental pollution should be prevented for a moment (1)(2)(3). Renewable energy resources should be used more frequently in order to meet the increasing energy demand.…”