β-Ni(OH) 2 nanosheets grown on graphene as advanced electrochemical pseudocapacitor materials with improved rate capability and cycle performance

Uniformly Dispersed ZnFe2O4 Nanoparticles on Nitrogen-Modified Graphene for High-Performance Supercapacitor as Electrode

“…8d , all these Nyquist plots exhibit a semicircle in the high frequency region and vertical line in the low frequency region. It is accepted that the semicircle diameter corresponds to the charge transfer impedance of the electrode and the straight line reveals the frequency dependence of ion diffusion/transport from electrolyte to the electrode surface 30 34 . Compared with ZnFe 2 O 4 NPs, the ZnFe 2 O 4 /NRG owns a much smaller semicircle and a more vertical line, indicating faster reaction kinetics and lower ion diffusion resistance.…”

“…Among various good conductive materials, graphene, as one of carbonaceous materials, represents an attractive substrate for the immobilization of active species to provide good electron transfer paths and improve stability of the entire hybrid, because of its porous two-dimensional structure, large specific surface area and exceptional high conductivity 26 27 28 . Simultaneously, it has been certified that graphene can act as a support to prevent the loaded nanomaterials from aggregation by balancing their high interface energy 29 30 31 . By the virtue of these advantages, a variety of electrode materials integrating pseudocapacitive component with graphene have been successfully constructed for achieving high-performance energy storage devices 32 33 34 .…”

Capacitance Performance of Nanostructured CoNi2S4 with Different Morphology Grown on Carbon Cloth for Supercapacitors

“…Thus considerable efforts have been focused on the design of binder‐free electrode architectures to avoid the “dead surface”, which is good for more efficient charge exchange and electrolyte penetration. Based on this consideration, many people choose to grow materials on conductive substrates such as Ni foam, graphene, and carbon cloth in order to increase the utilization efficiency of the electroactive materials. Many transition‐metal oxides have been built on carbon fiber; these include NiCo 2 O 4 , Ni(OH) 2 , Co 3 O 4 nanowires@MnO 2 nanolayer, NiMoO 4 nanowires, and MnO 2 nanosheet arrays which finally display excellent electrochemical performance.…”

“…[a] Z. Ai, Prof. Z. Hu, Y. Liu, M. Yao Department of Chemistry Tongji University graphene, [26,27] and carbon cloth [28][29][30][31][32] in order to increase the utilization efficiency of the electroactivem aterials. Many transition-metal oxidesh ave been built on carbon fiber;t hese include NiCo 2 O 4 , [28] Ni(OH) 2 , [29] Co 3 O 4 nanowires@MnO 2 nanolayer, [30] NiMoO 4 nanowires, [31] and MnO 2 nanosheet arrays [32] which finally displaye xcellent electrochemical performance.I nspired by the benefits of these strategies, some researchers also tried to grow nickel and cobalt sulfides on nickel foam and carbon fiber.S of ar,t hree-dimensional porousN iCo 2 S 4 nanonetworks on nickel foam, [33] hierarchicalm ushroom-like CoNi 2 S 4 arrays on nickel foam, [34] CoNi 2 S 4 nanoribbons on carbon fibers, [35] CoNi 2 S 4 nanosheet arrays supportedo nN i foams, [36] burl-like nickel cobalt sulfide on carbon fibers, [37] and NiCo 2 S 4 nanotube arrays on Ni foam [17] have been fabricated.…”

Self-assembling Ni(OH)2/α-Fe2O3 composites for pseudocapacitors with excellent electrochemical performance

“…The metal oxides/hydroxides, including Fe 2 O 3 /rGO [14], Ni(OH) 2 /rGO [15][16][17], NiO/rGO [18,19], ZnO/rGO [20], polyaniline/Ni(OH) 2 [21], etc, have undergone considerable research to improve their electrochemical performance as pseudocapacitors. In recent years, Fe 2 O 3 has been studied intensively in the application of pseudocapacitors due to its various advantages such as variable oxidation states, abundant resources, low cost, and green credentials [14,[22][23][24].…”