Surface activated Co3O4/MoO3 nanostructured electrodes by air-plasma treatment toward enhanced supercapacitor

Chen, Jinyu; Nakate, Umesh T.; Nguyen, Que Thi; Wei, Yuwen; Park, Sungjune

doi:10.1016/j.mseb.2022.115928

Cited by 11 publications

(8 citation statements)

References 49 publications

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“…Linearity is achieved up to R 2 values of 0.9714 and 0.9712 for the anodic peak current of EMO and GMO samples, respectively. Moreover, the power law , can be used to estimate how much of a faradic contribution there is i = a v b where i is the peak current (anodic or cathodic) and a and b are constants. When b ∼ 0.5, the diffusion-controlled process is dominant, whereas when b ∼ 1, the surface capacitive process is dominant.…”

Section: Resultsmentioning

confidence: 99%

“…The Trasatti approach is used to analyze the energy storage mechanism of the samples in order to acquire a greater understanding of the contributing phenomenon. The pseudocapacitance and EDLC contribution to the total capacitance value is thoroughly investigated using the following equations: ,, 1 C = k ′ v 1 / 2 + 1 C normalT C = k ′ v − 1 / 2 + C 0 where C T is the total capacitance, C 0 is the electric double layer capacitance (EDLC), C is the voltammetric capacitance, v is the voltammetric scan rate, and k ′ is a constant. It is possible to determine the pseudocapacitance contribution C p by using the relation C T = C 0 + C p …”

Section: Resultsmentioning

confidence: 99%

“…Linearity is achieved up to R 2 values of 0.9714 and 0.9712 for the anodic peak current of EMO and GMO samples, respectively. Moreover, the power law 21,23 can be used to estimate how much of a faradic contribution there is…”

Section: Is Given Belowmentioning

confidence: 99%

“…and can undergo reversible redox reactions, which means that they can rapidly store and release energy. Consequently, RuO 2 , MnO 2 , Co 3 O 4 , NiO, Fe 2 O 3 , TiO 2 , V 2 O 5 , WO 3 , CuO, ZnO, and their various composites , are the most widely utilized electrode materials for supercapacitors. High-temperature sustainability with low dimensional nanorods is one of the major issues as surface-to-volume proportion is one of the most important parameters for high specific capacitance .…”

Section: Introductionmentioning

confidence: 99%

“…and can undergo reversible redox reactions, which means that they can rapidly store and release energy. Consequently, RuO 2 , 19 MnO 2 , 20 Co 3 O 4 , 21 NiO, 22 Interestingly, Er and Gd have gained widespread recognition for their potential to be successful dopants in various oxide materials because of their 4f electron configuration. 22,47,48 Specifically, Gd has a half-filled electronic configuration, leading to excellent stability.…”

Section: Introductionmentioning

confidence: 99%

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Rare Earth Ion-Doped α-MnO₂Nanorods for an Asymmetric Supercapacitor

Mondal,

Kundu,

Paul

et al. 2024

ACS Appl. Nano Mater.

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The limited electrical conductivity of manganese dioxide (MnO 2 ) hinders its broad use as an electrode in all-solid-state supercapacitor devices (ASDs). To overcome this, trivalent gadolinium (Gd) and erbium (Er) ions are incorporated into MnO 2 , effectively addressing the issue. This involves synthesizing α-MnO 2 nanorods infused with Gd and Er by using a modified chemical process. Through the creation of crystal defects, augmentation of electrical conductivity, and increased porosity, the electrochemical performance is significantly enhanced. Cyclic voltammetry and galvanostatic charge− discharge measurements within the range of −0.2 to +0.6 V unveil improved capacitance values of 798 and 647 F g −1 at 1 A g −1 current density for Gd-and Er-doped α-MnO 2 respectively, maintaining 92.4% and 89.7% charge retention after 5000 cycles. Analysis reveals that both samples are primarily dominated by electric double-layer capacitance (EDLC). Furthermore, surface capacitance outweighs diffusion-controlled processes in the electrochemical storage mechanism. The Gd-doped α-MnO 2 coated device depicts a peak energy density of 78.5 Wh kg −1 at 106.01 W kg −1 power density for 0.5 A g −1 and maximum power density of 498.1 W kg −1 at 9.13 Wh kg −1 energy density for 3 A g −1 . Even a handcrafted 1 cm × 1 cm device achieves 2.252 V potential, effectively illuminating commercial LEDs.

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