High-performance NiCo₂O₄@Ni₃S₂core/shell mesoporous nanothorn arrays on Ni foam for supercapacitors

Growth of Ultrathin Mesoporous Ni-Mo Oxide Nanosheet Arrays on Ni Foam for High-performance Supercapacitor Electrodes

“…Figure 7C shows the CV curves of the Ni-Mo oxide nanosheets (NMO-2) at various scan rates from 5 to 50 mV/s. A pair of evident redox peaks is observed in each CV profile, which reveals the distinct characteristics of pseudocapacitance due to the reversible Faradaic redox reaction of Ni-Mo oxide with the alkaline electrolyte [46]. It is well accepted that the main function of the incorporated Mo element is to improve the electrical conductivity of metal oxide, and shall not be involved in any Faradaic redox reaction [47], which is also supported by the presence of only one couple of redox peaks in Figure 7C.…”

Hierarchical ZnCo2O4@NiCo2O4 Core–Sheath Nanowires: Bifunctionality towards High‐Performance Supercapacitors and the Oxygen‐Reduction Reaction

“…[50] Figure S4 ( Figure 7B furtherc onfirms the pseudocapacitance behavior with ad istinct plateau region, which is mainly due to the redox reactiono fN ia nd Co speciesi nt he alkaline electrolyte. The specific capacitance at variousd ischarge current densities for ZnCo 2 Figure 7C.A tt he current density of 1Ag [39] ). Although the specific capacitance decreases gradually with increasingt he current density because of insufficient active material involved in the redox reactiona th igh current densities, the specific capacitance of ZnCo 2 …”

“…[36][37][38] Amongv ariousM TMOs,s pinel nickel cobaltite (NiCo 2 O 4 )h as been suggested as ap romising alternative candidate for pseudocapacitors and ORR catalyst because of its better electrical conductivity and richer redox chemical valences over its two corresponding single-component oxides. [39][40][41][42] Yang et al developed one-dimensional( 1D) hierarchical nanostructure of NiCo 2 O 4 nanosheets on halloysite nanotubes through af acile co-precipitation method, which reveals ultra-high capacitance and remarkable cycling stability in virtue of the intense cationanion exchange performance between NiCo 2 O 4 and halloysite. [10] Cao and co-workers reported the low-cost preparation of three-dimensional (3D) macroporous NiCo 2 O 4 sheets as highly efficient non-noblem etal electrocatalyst for ORR, with the unique 3D macroporous structure efficiently decreasing the mass transport resistance and resulting in af our-electron pathway in alkaline conditions.…”

“…[10,11,39] Additionally,m ore effective active sites and largely decreased mass transport resistance can be achieved from the core-shell/porous structures,t hus allowing easier accession of reaction speciest ot he actives urface sites and being greatlyb eneficial for both supercapacitor and ORR performance.…”

NiCo2S4/Ni(OH)2 core-shell heterostructured nanotube arrays on carbon-fabric as high-performance pseudocapacitor electrodes

“…Therefore, it is still a great challenge to boost the electrochemical utilization of Ni(OH) 2 materials by rationally designing electrodes with their microstructures. An emerging attractive concept is to directly grow smart integrated array architectures with the combination of two types of materials and nanostructures on conducting substrates as binder-free electrodes for supercapacitors [15][16][17]. In this way, many competitive advantages such as rich accessible electroactive sites, short ion transport pathways, superior electron collection efficiency, desirable cycle life and excellent rate performance are obtained.…”