Direct fabrication of mixed metal–organic frameworks (Ni/Cu-MOF) and C@NiCu2O4 onto Ni foam as binder-free high performance electrode for supercapacitors

A hollow urchin-like metal–organic framework with Ni–O-cluster SBUs as a promising electrode for an alkaline battery–supercapacitor device

“…2a and b, the CV curves indicated that either the NiPSC or NiO electrode displayed evident redox peaks over a potential window of 0-0.6 V, where the oxidation peaks were centered at 0.42-0.52 V and the reduction peaks were located at 0.25-0.30 V. Based on the redox motif at various scan rates, the characteristics of battery-type electrode behavior can be inferred for both electrodes, 30,31 resembling the previous reports on Ni-based MOFs or Ni-based oxides/ hydroxides. 32,33 For the NiPSC electrode, the redox couple could be attributed to the Ni II and Ni III species, 34 while for the NiO electrode, the chemical process could only happen between the active substance NiO and NiOOH, 35,36 where OH − in the NiO lattice is replaced by O 2− to form a proton defect and the bivalent Ni site is replaced by trivalent Ni to produce an electronic defect. In contrast, the peak currents and integral areas of the NiPSC electrode, calculated from the CV profiles, are much larger than those of the NiO electrode, suggesting that the NiPSC electrode delivers a more superior performance.…”

Nano-TiO2 anchored onto 2D Cu–Ni bimetallic MOF as a heterojunction for highly-efficient OER overpotential reduction

“…The typical diffraction peaks of Cu/Ni-MOF at 2 θ = 10.2°, 11.5°, 12.1°, 17.1°, 18.6°, 20.4°, 34.1°, and 42.1° correspond to the crystal planes (200), (220), (222), (331), (400), (600), (330), and (440), respectively, which closely resemble the crystal structure of previously published literatures. 31,32 Furthermore, on comparing Cu-BDC-MOF (CCDC 687690) and Ni-BDC-MOF (CCDC 638866) in the published literature, 33,34 it was found that all major diffraction peaks of Cu/Ni-MOF synthesized in DMF were consistent with the reference figures, which proved that bimetallic element MOF is synthesized by the hydrothermal method in one step. The XRD patterns of homemade TiO 2 and standard TiO 2 (PDF #21-1272, space group: I 4 1 / amd (141)) show high crystallinity, which exhibits major diffraction peaks at 25.4°, 37.1°, 37.9°, 38.6°, 48.1°, 53.9°, 55.1°, 62.1°, 62.7°, and 68.8°, corresponding to (101), (103), (004), (112), (200), (105), (211), (213), (204), and (116) crystal planes, respectively.…”

“…11.51, 12.11, 17.11, 18.61, 20.41, 34.11, and 42.11 correspond to the crystal planes ( 200), ( 220), ( 222), ( 331), ( 400), (600), (330), and (440), respectively, which closely resemble the crystal structure of previously published literatures. 31,32 Furthermore, on comparing Cu-BDC-MOF (CCDC 687690) and Ni-BDC-MOF (CCDC 638866) in the published literature, 33,34 103), ( 004), ( 112), ( 200), ( 105), ( 211), ( 213), (204), and (116) crystal planes, respectively. The observed peaks showed that homemade TiO 2 is consistent with the main diffraction peaks of the standard spectrum.…”

Electro-Chemical Degradation of Norfloxacin Using a PbO2-NF Anode Prepared by the Electrodeposition of PbO2 onto the Substrate of Nickel Foam

“…The result was similar with the Rct determined in our experiments. Low Rct values (33.6 Ω, 1.84 Ω) for the pure PbO 2 electrode were also reported in the literature, which prove that the PbO 2 attached to the nickel foam electrode is scientific and can reasonably reduce impedance [36]. The Cdl was used to replace the double layer capacitance.…”