Nickel oxide encapsulated nitrogen-rich carbon hollow spheres with multiporosity for high-performance pseudocapacitors having extremely robust cycle life

Kim, Se Yun; Jeong, Hyung Mo; Kwon, Jun Ho; Ock, Il Woo; Suh, Won Hyuck; Stucky, Galen D.; Kang, Jeung Ku

doi:10.1039/c4ee02897j

Cited by 92 publications

(50 citation statements)

References 47 publications

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“…4a and b, respectively), the galvanostatic charge/dischargevoltage profiles are highly symmetrical and the Coulombic efficiency exceeds 97% in all cases. These results compare favourably with the values (not exceeding 65%) that can be estimated from the data of an hybrid electrochemical capacitor based on porous nickel oxide encapsulated carbon hollow spheres and nitrogen-doped graphene used positive and negative electrodes, respectively [27].…”

Section: Specific Energysupporting

confidence: 55%

New generation of hybrid carbon/Ni(OH)2 electrochemical capacitor using functionalized carbon electrode

Comte

Brousse

Bélanger

2016

Journal of Power Sources

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Section: Specific Energysupporting

confidence: 55%

New generation of hybrid carbon/Ni(OH)2 electrochemical capacitor using functionalized carbon electrode

Comte

Brousse

Bélanger

2016

Journal of Power Sources

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“…However, their capacitances (less than 300 F g À1 ) are too low to meet the growing needs for high-performance energy-storage equipment [6]. Transition metal oxide or hydroxide-based nanomaterials with remarkable theoretical capacitances, such as RuO 2 [7], MnO 2 [8][9][10], NiO [11][12][13], Co(OH) 2 [14,15] and Ni(OH) 2 [16,17], are chosen as the alternative electrode materials. Among the investigated transition metal oxide or hydroxide-based nanomaterials, nickel-based compounds such as Ni(OH) 2 have attracted a large amount of attention due to their low toxicity, low cost and excellent electrochemical properties [16][17][18][19], in addition, Ni(OH) 2 is also a typical paramagnetic material [20].…”

Section: Introductionmentioning

confidence: 99%

Cycling stability of ultrafine β-Ni(OH)2 nanosheets for high capacity energy storage device via a multilayer nickel foam electrode

Mao

Guo

et al. 2016

Electrochimica Acta

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Keywords:b-Ni(OH) 2 nanosheets hybrid supercapacitor multilayer nickel foam A B S T R A C T Ultrafine b-Ni(OH) 2 nanosheets with an average diameter of about 14.5 nm have been fabricated by immersing Na(HCO 3 ) 2 nanoparticles into 6 M KOH solution. The multilayer nickel foam system was introduced to improve the cycling stability of ultrafine b-Ni(OH) 2 nanosheets without using acetylene black. The results demonstrated that the specific discharge capacity of the b-Ni(OH) 2 electrode was up to 524.5C g À1 at 5 A g À1 and retained 83.8% after 1000 cycles, which was better than those of other b-Ni (OH) 2 electrodes obtained using acetylene black as conductors (retained 59.1% after 1000 cycles). Even after 5000 cycles, the specific capacity also maintained 80.8%. In addition, a hybrid supercapacitor was successfully fabricated based on ultrafine b-Ni(OH) 2 nanosheets and active carbon, the corresponding energy density and power density at 0.1 A g À1 were calculated to be 20.45 Wh kg À1 and 75 W kg À1 , respectively. What's more, the hybrid supercapacitor could light up a set of low-voltage light-emitting diodes.

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“…The electrochemical performance of hybrid supercapacitors is sensitive to the nature of the electrode materials, which are the key to developing a long cycle-life hybrid supercapacitor with high energy and power density. In a typical hybrid supercapacitor, the capacitive electrode is usually 4 activated carbon [11][12][13][14]22] or graphene [15,18,23,24], and the battery-type electrode is lithium intercalation compounds [7,8] or transition metal compounds [16,17,22,24,25].…”

Section: Introductionmentioning

confidence: 99%

A high-energy, long cycle-life hybrid supercapacitor based on graphene composite electrodes

Zhao

Chen

Xiong

et al. 2017

Energy Storage Materials

168

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Hybrid supercapacitors consisting of a battery-type faradaic electrode/capacitive electrode couple could achieve significantly improved energy density compared to that of the state-of-theart supercapacitors due to the extended voltage window and introduction of a battery-type electrode with high capacity. However, their commercial application is still hampered by lacking of proper electrode materials and structures. Here, a series of Co x Ni 1-x (OH) 2-reduced graphene oxide (rGO) nanocomposites are derived from a facile process at room temperature using hydrous hydrazine and different ratios of Co(II) to Ni(II) to tune the composition and morphology. In particular, an architectural composite electrode consisting of porous Co x Ni 1x (OH) 2 disks wrapped by rGO achieves high capacity, rate capability (743 and 545 C g-1 at 1 A g-1 and 20 A g-1 , respectively), and long cycling life. When coupled with a p-phenylenediamine (PPD)-modified rGO, the resulting hybrid supercapacitor exhibits superior energy densities of 72 and 44 W h Kg-1 at a power density of 797 W Kg-1 and 16.7 kW Kg-1 , respectively, and excellent cycling stability for 20,000 cycles at 20 A g-1 , implying that it is a very promising device for portable power and next-generation energy storage.

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Nickel oxide encapsulated nitrogen-rich carbon hollow spheres with multiporosity for high-performance pseudocapacitors having extremely robust cycle life

Abstract: Nickel oxide-encapsulated hollow carbon nitride spheres with multiporosity show an ∼250% enhancement in capacitance, in addition to their robust cycle life.

Cited by 92 publications

References 47 publications

New generation of hybrid carbon/Ni(OH)2 electrochemical capacitor using functionalized carbon electrode

New generation of hybrid carbon/Ni(OH)2 electrochemical capacitor using functionalized carbon electrode

Cycling stability of ultrafine β-Ni(OH)2 nanosheets for high capacity energy storage device via a multilayer nickel foam electrode

A high-energy, long cycle-life hybrid supercapacitor based on graphene composite electrodes

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