Preparation and Characterization of Nano Size NiOOH by Direct Electrochemical Oxidation of Nickel Plate

Selenide‐Based Electrocatalysts and Scaffolds for Water Oxidation Applications

“…The peak ­fitting analysis of Ni 2p ( Figure A) shows that the chemical species of Ni can be identified as Ni 2+ (852.65 eV) and Ni 3+ (855.62 eV), with binding energies that are close to those reported for nickel chalcogenides (NiSe, NiSe 2 , and NiCo 2 S 4 . Besides, another peak of Ni 3+ centered at 857.78 eV might be evidence for γ ‐NiOOH formation at the surface . On the basis of in situ X‐ray absorption near‐edge structure spectroscopy studies, Bediako et al pointed out that the γ ‐NiOOH phase is crucial to achieving high OER activity among Ni‐based catalysts.…”

Synthesis, structures and electrocatalytic properties of coordination polymers of 4,4′,4′′,4′′′-tetrakiscarboxyphenylsilane and 1,3,5-tris(2-methyl-1H-imidazol-1-yl)benzene

“…In the PXRD pattern of Ni-CP after the OER (Fig. 4(a)), the peaks at 13.7° (003) and 19.5° (001) were assigned to NiOOH (PDF#06-0075) and Ni(OH) 2 (PDF#73-1520), 78,79 respectively. The diffraction peaks of Ni-700 after the OER (Fig.…”

“…The binding energies at 852.7/855.6/858.7 eV of Ni 2p 3/2 and 872.5/873.8/876.4 eV of Ni 2p 1/2 (Table S13, ESI†) were ascribed to Ni 0 , Ni(OH) 2 and NiOOH. 79 The O 1s peaks at the binding energy of 531.6/532.3 eV were related to the OH − group and H 2 O, 80 while 533.7 eV was assigned to NiOOH. 79 The presence of metal Ni was still detected, which was also the reason for the slow increase of OER reactivity in the Ni-700 durability test, due to the gradual exposure of more Ni metal participating in the OER process.…”

“…79 The O 1s peaks at the binding energy of 531.6/532.3 eV were related to the OH − group and H 2 O, 80 while 533.7 eV was assigned to NiOOH. 79 The presence of metal Ni was still detected, which was also the reason for the slow increase of OER reactivity in the Ni-700 durability test, due to the gradual exposure of more Ni metal participating in the OER process. As shown in Table S12 (ESI†), the N/Ni ratio and the N/O ratio decreased revealing the destruction of Ni-CP and Ni-700 in the OER process.…”