ZnO and reduced graphene oxide electrodes for all-in-one supercapacitor devices

Buldu-Akturk, Merve; Toufani, Maryam; Tufani, Ali; Erdem, Emre

doi:10.1039/d2nr00018k

Cited by 100 publications

(36 citation statements)

References 55 publications

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“…Bookmark not defined. 42 42 can be observed here, and the deviation of this value is an indication of the delocalization of the electrons. Moreover, we can observe the presence of a hyperfine peak with a g factor value of ∼1.96 in the spectrum of pristine ZnO, which is not present in the case of N-CDs.…”

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confidence: 53%

N-Doped Carbon Dots and ZnO Conglomerated Electrodes for Optically Responsive Supercapacitor Applications

2023

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The over-dependence of human society on fossil fuels for energy is exhausting the level of such non-renewable energy sources. Alternative energy storage systems have gained more popularity recently to counter this issue. In this context, we report the fabrication of N-doped carbon dot (N-CD)-decorated ZnO-based electrodes for supercapacitor applications. Due to the light-responsive nature of the N-CDs and ZnO, the electrode was also responsive under the influence of UV light. After the experimental tests, it was found that the areal capacitance value of the supercapacitor increased upto ∼58.9% when illuminated compared to that under the dark conditions. Moreover, the device showed a maximum areal capacitance of 2.6 mF/cm2 after photocharging and galvanostatically discharging at a current density value of 1.6 μA/cm2, which is quite comparable with the previously reported data. The doping of N-CDs with ZnO showed a significant improvement in the areal capacitance value under both illuminated (∼58.64%) and dark conditions (∼22.08%) compared to the case of pristine ZnO, which justifies the purpose of attaching N-CDs with ZnO. Therefore, in brief, we have fabricated a photoresponsive electrode material for supercapacitor application by combining N-CDs and ZnO. An explicit electrochemical characterization of the electrode was also done to identify the contribution from diffusion-controlled capacitance and double layer capacitance, and it was observed that the diffusion-controlled capacitance gets reduced from 59.1 to 33.6% when the scan rate is increased from 2 to 75 mV/s. Moreover, a detailed study has also been done to understand the reaction mechanism. It was confirmed that the defects in the electrode material played a vital role in the intercalation of K+ ions.

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confidence: 53%

N-Doped Carbon Dots and ZnO Conglomerated Electrodes for Optically Responsive Supercapacitor Applications

2023

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“…The component of the Sn/C composite membrane was further explored via Raman spectroscopy. The Raman spectra (Figure C) of Sn/C-500 and Sn/C-600 display two distinct peaks at 1341.3/1593.5 and 1338.7/1594.8 cm –1 , which should be ascribed to the disorder-induced D band (A 1g mode) and the graphite G band (E 2g mode), respectively. , The degree of graphitization of carbonaceous materials can be evaluated based on the relative peak area A G /( A D + A G ). The A G /( A D + A G ) values of Sn/C-500 and Sn/C-600 are 0.27 and 0.31, indicating the establishment of a high conductive carbon network in the Sn/C composite membrane and the increased graphitization of carbonization product at higher temperature …”

Section: Results and Discussionmentioning

confidence: 99%

Precise Construction of Sn/C Composite Membrane with Graphene-Like Sn-in-Carbon Structural Units toward Hyperstable Anode for Lithium Storage

Ding

Zeng

et al. 2023

ACS Appl. Mater. Interfaces

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A new-type binder-free Sn/C composite membrane with densely stacked Sn-in-carbon nanosheets was prepared by vacuum-induced self-assembly of graphene-like Sn alkoxide and following in situ thermal conversion. The successful implementation of this rational strategy is based on the controllable synthesis of graphene-like Sn alkoxide by using Na−citrate with the critical inhibitory effect on polycondensation of Sn alkoxide along the a and b directions. Density functional theory calculations reveal that graphene-like Sn alkoxide can be formed under the joint action of oriented densification along the c axis and continuous growth along the a and b directions. The Sn/C composite membrane constructed by graphene-like Sn-in-carbon nanosheets can effectively buffer volume fluctuation of inlaid Sn during cycling and much enhance the kinetics of Li + diffusion and charge transfer with the developed ion/electron transmission paths. After temperature-controlled structure optimization, Sn/C composite membrane displays extraordinary Li storage behaviors, including reversible half-cell capacities up to 972.5 mAh g −1 at a density of 1 A g −1 for 200 cycles, 885.5/729.3 mAh g −1 over 1000 cycles at large current densities of 2/4 A g −1 , and terrific practicability with reliable fullcell capacities of 789.9/582.9 mAh g −1 up to 200 cycles under 1/4 A g −1 . It is worthy of noting that this strategy may open up new opportunities to fabricate advanced membrane materials and construct hyperstable self-supporting anodes in lithium ion batteries.

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“…34,35 Fig. 4b shows the intensity ratio of the I D / I G 36–39 corresponding to the defects in the graphene film on BTO particles. The ID/IG ratios of RS00, RS30, and RS60 exhibit 2.23, 2.14, and 2.07, respectively.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of dielectric performance of encapsulation in barium titanate oxide using size-controlled reduced graphene oxide

et al. 2022

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ZnO and reduced graphene oxide electrodes for all-in-one supercapacitor devices

Abstract: The nature and positions of defects, i.e., whether they are at the surface or in the lattice, in ZnO and carbonaceous electrodes were identified via EPR spectroscopy. It was shown that defects play a crucial role in supercapacitor device performance.

Cited by 100 publications

References 55 publications

N-Doped Carbon Dots and ZnO Conglomerated Electrodes for Optically Responsive Supercapacitor Applications

N-Doped Carbon Dots and ZnO Conglomerated Electrodes for Optically Responsive Supercapacitor Applications

Precise Construction of Sn/C Composite Membrane with Graphene-Like Sn-in-Carbon Structural Units toward Hyperstable Anode for Lithium Storage

Enhancement of dielectric performance of encapsulation in barium titanate oxide using size-controlled reduced graphene oxide

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