Optimized pseudocapacitance of CoMn2O4@MoO3 nano–microspheres for advanced lithium storage properties

Coupling of Nd doping and oxygen-rich vacancy in CoMoO4@NiMoO4 nanoflowers toward advanced supercapacitors and photocatalytic degradation

“…The CV curve of 0.8% Nd–CoMoO 4 @NiMoO 4 shows oxidation and reduction peaks at −0.2 V and 0.6 V, indicating the pseudocapacitive reaction characteristics of the material. 52 The faradaic reactions corresponding to the oxidation and reduction peaks are as follows: 53,54 3[Co(OH) 3 ] − ↔ Co 3 O 4 + 4H 2 O + OH − + 2e − Co 3 O 4 + H 2 O + OH − ↔ 3CoOOH + e − CoOOH + OH − ↔ CoO 2 + H 2 O + e − Ni 2+ + 2OH − ↔ Ni(OH) 2 Ni(OH) 2 + OH − ↔ NiOOH + H 2 O + e − The electrochemical capacitance of 0.8% Nd–CoMoO 4 @NiMoO 4 is mainly caused by the reversible redox process of Co 2+ /Co 3+ and Ni 2+ /Ni 3+ . In alkaline solution, the redox electron pairs of Ni 2+ /Ni 3+ are affected by OH − ions, and the main role of Mo atoms is to improve the conductivity of metal molybdates.…”

Preparation of porous CoMoO4+ NiMoO4nanosheets with high capacitance by a sol–gel method and freezing method

“…The CV curves of the porous CoMoO 4 + NiMoO 4 nanosheets showed REDOX peaks at À0.2 and 0.6 V, indicating that the material has pseudocapacitance reactivity characteristics. 21 The Faraday reaction corresponding to the REDOX peak is as follows: [22][23][24] The electrochemical capacitance of CoMoO 4 + NiMoO 4 is due to the reversible transfer process of Co 2+ /Co 3+ REDOX electron pairs. The Ni 2+ /Ni 3+ REDOX pair is likely to be influenced by the OH À ions in the basic solution.…”

“…The CV curves of the porous CoMoO 4 + NiMoO 4 nanosheets showed REDOX peaks at −0.2 and 0.6 V, indicating that the material has pseudocapacitance reactivity characteristics. 21 The Faraday reaction corresponding to the REDOX peak is as follows: 22–24 3[Co(OH) 3 ] − ↔ Co 3 O 4 + 4H 2 O + OH − + 2e − Co 3 O 4 + H 2 O + OH − ↔ 3CoOOH + e − CoOOH + OH − ↔ CoO 2 + H 2 O + e − Ni 2+ + 2OH − ↔ Ni(OH) 2 Ni(OH) 2 + OH − ↔ NiOOH + H 2 O + e − …”

Hollow Mn–Co–O@C Yolk–Shell Microspheres with Carbon Shells as Cathodes Derived from a Double-Metal MOF for Aqueous Zinc-Ion Batteries

“…Figure b shows the XRD pattern under various charging and discharging voltages. It can be observed that during charging and discharging, a part of Mn–Co–O@C is converted into CoMn 2 O 4 , which can provide a higher zinc-ion diffusion coefficient for the positive electrode material . The aggregation of H + makes a part of Mn transform into MnOOH and then into Mn 3 O 4 or MnO 2 .…”

“…It can be observed that during charging and discharging, a part of Mn−Co−O@C is converted into CoMn 2 O 4 , which can provide a higher zinc-ion diffusion coefficient for the positive electrode material. 50 The aggregation of H + makes a part of Mn transform into MnOOH and then into Mn 3 O 4 or MnO 2 . In the subsequent discharge process, Zn 2+ is inserted into the material to further transform MnO 2 into ZnMn 2 O 4 .…”