Hierarchical NiCo₂O₄@NiMoO₄ core–shell hybrid nanowire/nanosheet arrays for high-performance pseudocapacitors

Abstract

Hierarchical NiCo2O4@NiMoO4 core–shell nanowire/nanosheet arrays were successfully fabricated and assembled in an asymmetric supercapacitor device with outstanding electrochemical performance.

Rapid microwave-assisted synthesis of mesoporous NiMoO4 nanorod/reduced graphene oxide composites for high-performance supercapacitors

“…From the inset of Fig. 11, it can be seen that two asassembled button cell in series can be able to energize the LED brightly (red lamp with starting voltage of 2.2 V), suggesting that these devices are very promising candidates for various practical applications [51]. The schematic of the structure of the asassembled button cell shown in Fig.…”

Enhanced cycling stability of NiCo2S4@NiO core-shell nanowire arrays for all-solid-state asymmetric supercapacitors

“…Therefore, the maximum harvest of pseudocapacitance can be achieved from the NiCo 2 S 4 @NiO core-shell nanostructure36373839. (iii) The combination of NiCo 2 S 4 and NiO with different redox reaction potential results in more electro active sites for the Faradaic redox reactions404142. (iv) Comparing with the bare NiCo 2 S 4 NAWs, the three-dimensional core-shell structure of the NiCo 2 S 4 @NiO NAWs can retard the inside strain which caused by the volume changes during the cycling, The NiCo 2 S 4 NWAs are served as rigid back-bones to support NiO by interlinking the polymeric chains, the NiO nanosheets coated on the NiCo 2 S 4 NWs may relieve the stress exerted on inner nanowires caused by severe volume change, and thus suppress the degradation of the NiCo 2 S 4 core434445.…”

“…The highest energy density obtained here is superior than that of many reported ASC devices based on NiCo 2 S 4 , such as the NiCo 2 S 4 nanosheet//AC with the energy density of 25.5 W h Kg −1  49, the NiCo 2 S 4 //AC with the energy density of 22.8 W h kg −1 at 0.16 W kg −1  50, the NiCo 2 S 4 (nanosheets)//AC with the energy density of 22.4 W h kg −1 at 0.335 kW kg −1  49 and mesoporous NiCo 2 S 4 (nanoparticles)//AC with the energy density of 28.3 W h kg −1 at 0.245 kW kg −1  51. Compared with a sequence of other ASC devices based the core-shell structure, like CNT@NiO//PCPs (25.4 W h kg −1 at 0.4 kW kg −1 ) 52, Ni(OH)@3DNi//AC (21.8 W h kg −1 at 0.66 kW kg −1 ) 46 and NiCo 2 O 4 @NiMoO 4 //AC (21.7 W h kg −1 at 0.157 kW kg −1 ) 41, the result of NiCo 2 S 4 @NiO//AC device developed here also possesses a competitive superiority. In order to further demonstrate the potential application of the ASC, a green light-emitting diode (LED) indicator was powered after charging to 3.2 V for 20 s, as shown in Fig.…”

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

“…Due to the many advantages such as simplicity, rapid response, excellent reproducibility and stability, electrochemical methods have attracted great interests and are widely used in the fields of energy conversion, biological and environmental analysis [36][37][38][39][40][41][42]. Specifically, the electrochemical measurements of the electrodes were performed on a CHI 760E electrochemical workstation (Chenhua, Shanghai) in a standard three-electrode system in 2 M KOH aqueous electrolyte at room temperature.…”