Graphene encapsulated NiS/Ni3S4 mesoporous nanostructure: A superlative high energy supercapacitor device with excellent cycling performance

Nandhini, S.; Muralidharan, G.

doi:10.1016/j.electacta.2020.137367

Cited by 36 publications

(16 citation statements)

References 48 publications

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“…Due to their special electrical, optical, and thermal properties, graphene added composite materials have been extensively studied for different energy conversion and sensing applications. [173][174][175][176][177][178][179][180][181][182] A simple schematic illustration on the formation of graphene covered grains in the bulk is shown in Fig. 16.…”

Section: Secondary Phase At Grain Boundariesmentioning

confidence: 99%

Core–shell nanostructures for better thermoelectrics

Mulla

Dunnill

2022

Mater. Adv.

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Section: Secondary Phase At Grain Boundariesmentioning

confidence: 99%

Core–shell nanostructures for better thermoelectrics

Mulla

Dunnill

2022

Mater. Adv.

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“…According to Equation (1), the energy density (E) of the device will show linear correlation on the specific capacitance (C), whereas will be proportional to the square of the voltage window (V 2 ). Although numerous excellent works are available on the improving the specific capacitance, [20,21] rate performance, [22][23][24][25] cycling stability, [26][27][28] and so forth, of electrode materials. However, little attention has been paid to the expansion of the working voltage of supercapacitors, even though theoretically it is a more effective optimization approach.…”

Section: Introductionmentioning

confidence: 99%

Perspectives on Working Voltage of Aqueous Supercapacitors

Guo

Zhou

Pang

et al. 2022

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Aqueous supercapacitors have the superiorities of high safety, environmental friendliness, inexpensive, etc. High energy density supercapacitors are not conducive to manufacturing due to the limitation of water thermodynamic decomposition potential, resulting in a narrow working voltage window. To address such challenges, a great endeavor has started to investigate high voltage aqueous supercapacitors as well as making some progress. This review summarizes key strategies regarding the realization of wide working voltage of aqueous supercapacitors and analyzes the involved mechanism, including the optimization of electrodes, electrolytes, diaphragms, and supercapacitor structures. From the perspective of extending the theoretical voltage window, electrode functionalization, heteroatom doping, neutral electrolyte, water‐in‐salt electrolyte, introducing redox mediators into electrolyte, and designing asymmetric structure are effective strategies for achieving this goal. Further, the actual voltage window can be maximized by optimizing the electrode mass ratio, adjusting potential of zero voltage, and electrode functionalization. The challenge and future of expanding working voltage of aqueous supercapacitors are further discussed. Importantly, this review provides inspiration for the development of supercapacitors with high energy density.

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“…Among them, nickel sulfides have high theoretical specific capacities. However, the periodic ion insertion/de-insertion during the charge/discharge process will cause significant volume changes, which leading to its rapid capacity attenuation, low energy density [20] and poor cycling stability [21]. For examples, energy densities of Ni3S4/carbon cloth//active carbon (AC) hybrid supercapacitor (HSC) [22] and Cu(NiCo)2S4/Ni3S4//AC HSC [23] only reached 14.6 Wh kg -1 and 40.5 Wh kg -1 at 785.5 W kg -1 and 750.8 W kg -1 , respectively, and their specific capacitance values were only maintained at ~84.7% and ~85.0% after 5000 charge/discharge cycles, respectively.…”

Section: Introductionmentioning

confidence: 99%