Asymmetric supercapacitors based on La-doped MoO3 nanobelts as advanced negative electrode and VOR nanosheets as positive electrode

Shi, Zijun; Liu, Juyin; Gao, Yanfang; Yu, Xu

doi:10.1007/s10853-020-05284-0

Cited by 27 publications

(15 citation statements)

References 62 publications

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“…[ 59 ] Furthermore, the relaxation time constant (τ 0 ) is calculated by the formula τ 0 = 1/ f 0 , where f 0 is the frequency at the angle of 45°. [ 21,47 ] Through calculation, the τ 0 values (Figure S5, Supporting Information) of OV‐MoO 3 , OV‐MoO 3 /Ce = 40/1, OV‐MoO 3 /Ce = 30/1, and OV‐MoO 3 /Ce = 20/1 are 6.31, 4.34, 3.61, and 6.67 s, respectively. The smaller τ 0 value indicates that MoO 3 /Ce = 30/1 has a faster frequency response and confirms rapid adsorption/diffusion of electrolyte ions on the MoO 3 /Ce = 30/1 surface.…”

Section: Resultsmentioning

confidence: 99%

Advanced Oxygen‐Vacancy Ce‐Doped MoO₃ Ultrathin Nanoflakes Anode Materials Used as Asymmetric Supercapacitors with Ultrahigh Energy Density

Zhou

Chao

et al. 2022

Advanced Energy Materials

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Asymmetric supercapacitors (ASC) meet the high power and energy demand in energy storage devices; however, the low capacitance of the anode materials severely hinders the development of ASCs. MoO3 with its high theoretical capacity is an ideal anode material, but its low electrical conductivity limits the application of capacitive energy storage. Herein, abundant oxygen vacancies Ce‐doped MoO3 (OV‐MoO3/Ce) ultrathin nanoflakes anode materials with a thickness of 1.51‐2.01 nm are constructed by a simple hydrothermal method. It is found that the nanostructure of MoO3 can be controllably changed from thick nanobelts into ultrathin nanoflakes by adjusting the Ce doping concentration. And Ce doping in the OV‐MoO3 lattice can additionally introduce abundant oxygen vacancies without introducing Ce oxide and other impurities. Benefiting from the synergy of ample oxygen vacancies, high specific surface area, and accelerated ion diffusion and charge mobility, the optimized OV‐MoO3/Ce electrode achieves a high specific capacitance (1439.0 F g‐1 at 2 mV s‐1 and 1446.3 F g‐1 at 5 A g‐1) and good cycle stability. More impressively, the ASC assembled using optimized OV‐MoO3/Ce as anode materials can provide an ultrahigh energy density of 150.0 Wh kg‐1 at a power density of 800 W kg‐1, and the practical demonstration of the assembled ASC device highlights its great potential for high energy storage.

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Section: Resultsmentioning

confidence: 99%

Advanced Oxygen‐Vacancy Ce‐Doped MoO₃ Ultrathin Nanoflakes Anode Materials Used as Asymmetric Supercapacitors with Ultrahigh Energy Density

Zhou

Chao

et al. 2022

Advanced Energy Materials

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“…These values of the Co-MoO 3– x electrode are significantly higher than those observed for the P-MoO 3 electrode. The C g of the Co-MoO 3– x electrode is equivalent to or even greater than those of previously reported MoO 3 -based electrodes, which is more significant, such as rGO/MoO 3– x (307 C/g at 1 A/g), MoO 3 film (306 C/g at 1 A/g), MoO 3– x (484 C/g at 1 A/g), and La-doped MoO 3 (420 C/g at 1 A/g) . The long-term cycle performances of the P-MoO 3 and Co-MoO 3– x electrodes are evaluated at a current density of 20 A/g for 3000 cycles (Figure d).…”

Section: Resultsmentioning

confidence: 94%

Revealing Interstitial Diffusion and Vacancy Diffusion Kinetics of Battery-like Electrodes for High-Performance Pseudocapacitors

Yin

Hao

2023

ACS Appl. Energy Mater.

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Battery-type materials have been identified as highly promising electrode materials for supercapacitors due to their high theoretical capacitance. However, their substantially lower practical capacitance is due to their poor electrode kinetics, which severely restrict the usage of redox-active regions on the electrode surface. To address this issue, the oxygen-vacancy-abundant Co-MoO 3−x microsphere structure is used as a representative example to explore the interstitial diffusion and vacancy diffusion kinetics by adjusting the internal crystal structure, ultimately achieving an accelerated H + ion transport rate. First-principles simulations show that the defect structure in Co-MoO 3−x , which originates from Co 3d orbitals and is generated close to the Fermi level, can modulate the electronic states. The prepared asymmetric supercapacitor device using Co-MoO 3−x exhibits a very high specific capacitance of 167.7 C/g at 1 A/g, a high energy density of 30.2 Wh/kg at a power density of 865 W/kg, and an excellent capacitance retention of 82.1% after 5000 cycles in H 2 SO 4 electrolyte. This research demonstrates the potential for internal crystal structure adjustment to enhance the performance of electrode materials, especially battery-like electrode materials, for high-performance supercapacitors.

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“…RE doping can improve the affinity and wettability of TMOs to the electrolytes because the RE element has a greater affinity for oxygen than the M element, [164] which is beneficial to the interfacial interaction between TMOs and electrolyte ions and improves the capacitive performance. Furthermore, the lattice strain induced by the dopants replacing the smaller M ions with RE with larger ionic radius leads to an increase in the interlayer spacing of the TMOs and the introduction of additional oxygen vacancies, [19,165] which can greatly improve the electrical conductivity, charge/electron transport and redox activity. [148] In recent years, Ce, [166][167][168][169][170][171] La, [172][173][174][175] Eu, [176] Gd, [177,178] Nd, [179] Er, [180] Yb, [181] Y, [182] and Dy [183] have been considered as dopants to introduce TMOs for SCs.…”

Section: Re/tmo Compositesmentioning

confidence: 99%

Rare Earth‐Based Nanomaterials for Supercapacitors: Preparation, Structure Engineering and Application

Zhou

2022

ChemSusChem

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Supercapacitors (SCs) can effectively alleviate problems such as energy shortage and serious greenhouse effect. The properties of electrode materials directly affect the performance of SCs. Rare earth (RE) is known as “modern industrial vitamins”, and their functional materials have been listed as key strategic materials. In the past few years, the number of scientific reports on RE‐based nanomaterials for SCs has increased rapidly, confirming that adding RE elements or compounds to the host electrode materials with various nanostructured morphologies can greatly enhance their electrochemical performance. Although RE‐based nanomaterials have made rapid progress in SCs, there are very few works providing a comprehensive survey of this field. In view of this, a comprehensive overview of RE‐based nanomaterials for SCs is provided here, including the preparation methods, nanostructure engineering, compounds, and composites, along with their capacitance performances. The structure–activity relationships are discussed and highlighted. Meanwhile, the future challenges and perspectives are also pointed out. This Review can not only provide guidance for the further development of SCs but also arouse great interest in RE‐based nanomaterials in other research fields such as electrocatalysis, photovoltaic cells, and lithium batteries.

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Asymmetric supercapacitors based on La-doped MoO3 nanobelts as advanced negative electrode and VOR nanosheets as positive electrode

Cited by 27 publications

References 62 publications

Advanced Oxygen‐Vacancy Ce‐Doped MoO₃ Ultrathin Nanoflakes Anode Materials Used as Asymmetric Supercapacitors with Ultrahigh Energy Density

Advanced Oxygen‐Vacancy Ce‐Doped MoO₃ Ultrathin Nanoflakes Anode Materials Used as Asymmetric Supercapacitors with Ultrahigh Energy Density

Revealing Interstitial Diffusion and Vacancy Diffusion Kinetics of Battery-like Electrodes for High-Performance Pseudocapacitors

Rare Earth‐Based Nanomaterials for Supercapacitors: Preparation, Structure Engineering and Application

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Asymmetric supercapacitors based on La-doped MoO3 nanobelts as advanced negative electrode and VOR nanosheets as positive electrode

Cited by 27 publications

References 62 publications

Advanced Oxygen‐Vacancy Ce‐Doped MoO3 Ultrathin Nanoflakes Anode Materials Used as Asymmetric Supercapacitors with Ultrahigh Energy Density

Advanced Oxygen‐Vacancy Ce‐Doped MoO3 Ultrathin Nanoflakes Anode Materials Used as Asymmetric Supercapacitors with Ultrahigh Energy Density

Revealing Interstitial Diffusion and Vacancy Diffusion Kinetics of Battery-like Electrodes for High-Performance Pseudocapacitors

Rare Earth‐Based Nanomaterials for Supercapacitors: Preparation, Structure Engineering and Application

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Product

Resources

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Advanced Oxygen‐Vacancy Ce‐Doped MoO₃ Ultrathin Nanoflakes Anode Materials Used as Asymmetric Supercapacitors with Ultrahigh Energy Density

Advanced Oxygen‐Vacancy Ce‐Doped MoO₃ Ultrathin Nanoflakes Anode Materials Used as Asymmetric Supercapacitors with Ultrahigh Energy Density