Hierarchical mesoporous NiO nanoarrays with ultrahigh capacitance for aqueous hybrid supercapacitor

Transition metal sulfides have been suggested as promising materials for efficient energy storage with superior electrochemical performances. Compound NiMoS4-A was synthesized by a facile chemical co-precipitation process, followed by calcining at 450 o C in Ar. The asprepared NiMoS4-A electrode exhibits a high specific capacity of 313 C g -1 at 1 A g -1 and good rate capability (83% retention at 10 A g -1 ). Electrochemical impedance spectroscopy (EIS) results indicate that the good performances could be attributed to the low internal and charge transfer resistances. Additionally, the quantitative charge storage analysis reveals that the Faradaic redox process dominates at lower scan rates (78% at 1 mV s -1 ), while the capacitive effect dominates at higher scan rates (56% at 20 mV s -1 ). Furthermore, a hybrid supercapacitor (HSC), with NiMoS4-A as the positive electrode and activated carbon (AC) as the negative electrode, displays a high energy density of 35 Wh kg -1 at an average power density of 400 W kg -1 . Meanwhile, the HSC exhibits excellent cycle stability, maintaining 82% of the initial capacitance after 10000 charge-discharge cycles even at a high current density of 5 A g -1 . These good electrochemical performances indicate that NiMoS4-A is a promising positive electrode material for hybrid supercapacitors.3

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“…7 Many materials have been claimed holding good supercapacitor performances such as MnO2, 12,13 NiO, 14,15 …”

Section: 8mentioning

confidence: 99%

Synthesis of NiMoS₄for High-Performance Hybrid Supercapacitors

Lan

Humphreys

et al. 2017

J. Electrochem. Soc.

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“…Zhu et al [102] Using a facile, low-cost, and environment-friendly template method, Liu et al [103] successfully prepared hierarchical mesoporous NiO nanoarrays (NiOHMNAs). The synthesis process of NiO-HMNAs is shown in Fig.…”

Section: Nickel Oxidesmentioning

confidence: 99%

Hierarchically nanostructured transition metal oxides for supercapacitors

et al. 2017

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“…Generally, electrode materials can be divided into three categories: carbon materials [8][9][10], conductive polymer materials [11][12][13][14], and transition metal oxides (TMOs) (MnO 2 , NiO, Co 3 O 4 , NiCo 2 O 4 , ZnCo 2 O 4 , etc.) [15][16][17][18][19][20][21]. Among the candidate electrode materials, TMOs have higher specific capacity and energy density than carbonbased materials and more excellent chemical stability than conductive polymer materials, considered as a promising choice for the supercapacitors.…”

Section: Introductionmentioning

confidence: 99%