N-doped and oxygen vacancy-rich NiCo2O4 nanograss for supercapacitor electrode

Song, Wei; Wan, Caichao; Zhang, Luyu; Liu, Xinyi; Tian, Wenyan; Su, Ji; Cheng, Wenjie; Wu, Yiqiang

doi:10.1016/j.cej.2021.132242

Cited by 140 publications

(89 citation statements)

References 59 publications

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“…Particularly, TMOs, such as NiO [ 7 ], MoO 3 [ 8 ], Co 3 O 4 [ 9 ], and MnO 2 [ 10 ], have received considerable attention due to their low cost, convenience of synthesis, environmental friendliness, and relatively high capacitance. Compared to binary TMOs, ternary TMOs materials containing two different metal cations, such as NiCo 2 O 4 [ 11 ], ZnCo 2 O 4 [ 12 , 13 ], CoMoO 4 [ 14 ], MnMoO 4 [ 15 ], and NiMoO 4 [ 16 ], as well as some solid solutions [ 17 ], exhibit higher electrochemical activity due to the rich redox reactions stemming from the multiple oxidation states of the transition-metal components. It has been proposed that NiMoO 4 has a good reversible capacitance and electrochemical characteristics for SCs/ASCs applications because of the electrochemical active Ni cation and improved electronic conductivity from Mo cation [ 16 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

et al. 2022

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Developing high-performance electrode materials is in high demand for the development of supercapacitors. Herein, defect and interface engineering has been simultaneously realized in NiMoO4 nanowire arrays (NWAs) using a simple sucrose coating followed by an annealing process. The resultant hierarchical oxygen-deficient NiMoO4@C NWAs (denoted as “NiMoO4−x@C”) are grown directly on conductive ferronickel foam substrates. This composite affords direct electrical contact with the substrates and directional electron transport, as well as short ionic diffusion pathways. Furthermore, the coating of the amorphous carbon shell and the introduction of oxygen vacancies effectively enhance the electrical conductivity of NiMoO4. In addition, the coated carbon layer improves the structural stability of the NiMoO4 in the whole charging and discharging process, significantly enhancing the cycling stability of the electrode. Consequently, the NiMoO4−x@C electrode delivers a high areal capacitance of 2.24 F cm−2 (1720 F g−1) at a current density of 1 mA cm−2 and superior cycling stability of 84.5% retention after 6000 cycles at 20 mA cm−2. Furthermore, an asymmetric super-capacitor device (ASC) has been constructed with NiMoO4−x@C as the positive electrode and activated carbon (AC) as the negative electrode. The as-assembled ASC device shows excellent electrochemical performance with a high energy density of 51.6 W h kg−1 at a power density of 203.95 W kg−1. Moreover, the NiMoO4//AC ASC device manifests remarkable cyclability with 84.5% of capacitance retention over 6000 cycles. The results demonstrate that the NiMoO4−x@C composite is a promising material for electrochemical energy storage. This work can give new insights on the design and development of novel functional electrode materials via defect and interface engineering through simple yet effective chemical routes.

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Section: Introductionmentioning

confidence: 99%

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

et al. 2022

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“…The following eqn ( 15) is used to better distinguish the contribution of diffusion control and surface capacitor control processes to the total capacitance. [54][55][56][57] i(V)…”

Section: Resultsmentioning

confidence: 99%

Interfacial engineering in amorphous/crystalline heterogeneous nanostructures as a highly effective battery-type electrode for hybrid supercapacitors

et al. 2022

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“…After the activation by KOH, a hierarchical porous structure is formed for KA-GSDC ( Figure 6 c), indicating a higher potential surface area. An abundant pore structure with a large surface area is conducive to ion transfer and promotes the reduction reaction of electrolytes, which are of great significance to improve the cell’s performance [ 40 ]. To investigate the purity of the GSDC, an EDX analysis is carried out in Figure 6 d, where there are primarily two signals including oxygen (18.56 wt%) and carbon (81.44 wt%) that are detected.…”

Section: Resultsmentioning

confidence: 99%

“…The I D / I G intensity ratios of GSDC and KA-GSDC are 1.08 and 1.11, respectively. It is worth noting that a higher intensity ratio indicates a higher degree of defects, which is positively correlated with the fraction of mesopores [ 40 ]. Moreover, the previous study has demonstrated that the increased defect density contributes to the catalytic ability in DSSCs [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

Dual Application of Waste Grape Skin for Photosensitizers and Counter Electrodes of Dye-Sensitized Solar Cells

Yuan

Wan

2022

Nanomaterials

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Dye-sensitized solar cells (DSSCs), a powerful system to convert solar energy into electrical energy, suffer from the high cost of the Pt counter electrode and photosensitizer. In this study, the dual application of waste grape skin is realized by employing the grape skin and its extract as the carbon source of the carbon-based counter electrode and photosensitizer, respectively. The ultraviolet–visible absorption and Fourier transform infrared spectroscopy verify the strong binding between the dye molecules (anthocyanins) in the extract and the TiO2 nanostructure on the photoanode, contributing to a high open-circuit voltage (VOC) value of 0.48 V for the assembled DSSC device. Moreover, the waste grape skin was subjected to pyrolysis and KOH activation and the resultant KOH-activated grape skin-derived carbon (KA-GSDC) possesses a large surface area (620.79 m2 g−1) and hierarchical porous structure, leading to a high short circuit current density (JSC) value of 1.52 mA cm−2. Additionally, the electrochemical impedance spectroscopy reveals the efficient electron transfer between the electrocatalyst and the redox couples and the slow recombination of electrolytic cations and the photo-induced electrons in the conduction band of TiO2. These merits endow the DSSC with a high photovoltaic efficiency of 0.48%, which is 33% higher than that of a common Pt-based DSSC (0.36%). The efficiency is also competitive, compared with some congeneric DSSCs based on other natural dyes and Pt counter electrode. The result confirms the feasibility of achieving the high-value application of waste grape skin in DSSCs.

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N-doped and oxygen vacancy-rich NiCo2O4 nanograss for supercapacitor electrode

Cited by 140 publications

References 59 publications

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

Interfacial engineering in amorphous/crystalline heterogeneous nanostructures as a highly effective battery-type electrode for hybrid supercapacitors

Dual Application of Waste Grape Skin for Photosensitizers and Counter Electrodes of Dye-Sensitized Solar Cells

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