Highly porous metal organic framework derived NiO hollow spheres and flowers for oxygen evolution reaction and supercapacitors

Bifunctional Catalytic Activity of Solvothermally Synthesized CeO2 Nanosphere/NiO Nanoflake Nanocomposites

“…In an alkaline solution, Ni 3+ can generate NiO(OH) by absorbing OH − , which crucially improves the OER activity of the catalyst. 55 Notably, the slight shifting of the Ni 2p peak toward a higher binding energy for the CeO 2 /NiO-2 nanocomposite as compared to the pure NiO confirms the electronic coupling between NiO and CeO 2 at the interface. Thus, it can be concluded that the presence of NiO enhances the percentage of Ce 3+ associated with the oxygen vacancy defects.…”

“…Apart from these peaks, Ni 2p XPS spectra display additional peaks corresponding to Ni 3+ at ∼873 and ∼855 eV. 55 The existence of Ni 3+ is due to the presence of some Ni 2 O 3 on the surface, which arises due to the lattice defects. 56 The amount of Ni 3+ present in pure NiO and the CeO 2 /NiO-2 nanocomposite is 15 and 20%, respectively.…”

Enhanced electrocatalytic activity of low-cost NiO microflowers on graphene paper for the oxygen evolution reaction

“…24 Thanks to the unique size dependent properties, mass diffusion, and high surface area, nanostructured NiO is oen used as a high-performance OER catalyst. [21][22][23]25,[27][28][29] Finally, graphene supported NiO nanostructures have been demonstrated in the literature to be a very good option, since graphene enhances electron transport and hence catalytic performance, 30 promotes nanostructure dispersion and inhibits their aggregation.…”

Flexible solid-state hybrid supercapacitors for the internet of everything (IoE)

“…39,46,47 They store charge faradaically through the charge transfer between the electrode and electrolyte. Common pseudocapacitor electrode materials include metal oxides [48][49][50][51][52][53] and conductive polymers. 51,[54][55][56][57][58][59] However, those materials have high resistivity, which is not conducive to electron transport in the electrochemical process.…”