Oxygen vacancies enhancing capacitance of MgCo2O4 for high performance asymmetric supercapacitors

Wang, Hongzhi; Mi, Nanyang; Sun, Shaofeng; Zhang, Weiguo; Yao, Susu

doi:10.1016/j.jallcom.2021.159294

Cited by 46 publications

(9 citation statements)

References 57 publications

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“…Our following studies on valence band maximum (VBM) values confirmed the decrease in VBM values from 1.34 eV at the SnO 2 film to a value of 0.82 eV at 2D SnO 2 -ZnO heterointerfaces. It confirms the alteration of energy band alignment at 2D SnO 2 -ZnO heterointerfaces. − …”

Section: Resultssupporting

confidence: 58%

Two-Dimensional SnO₂-ZnO Nanohybrid Electrode Fabricated via Atomic Layer Deposition for Electrochemical Supercapacitors

Lopa

Akbari

et al. 2023

Energy Fuels

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Two-dimensional (2D) heterostructures of transition metal oxides (TMOs) are promising candidates for high-performance electrochemical supercapacitors (ESCs). Herein, sub-10 nm 2D SnO2-ZnO heterostructures were constructed on Au-modified SiO2/Si wafers by an atomic layer deposition (ALD) technique for ESC application. The cyclic voltammetry (CV) study revealed the pseudocapacitive-type Faradaic redox reactions of the 2D SnO2-ZnO heterostructure electrode with good reversibility. The electrode exhibited high energy storage capability with a high specific capacitance (C s) of 538.90 F g–1 at a scan rate and current density of 10 mV s–1 and 8.0 A g–1, respectively. The corresponding energy density and the power density were 14.80 Wh kg–1 and 2512.35 W kg–1, respectively, at 8.0 A g–1. The high energy storage capacity of the heterostructure electrode can be ascribed to the combination of improved infiltration and intercalation/deintercalation of electrolyte ions induced by the nanoscale thickness and enhanced redox activity of the heterostructure. Furthermore, the 2D electrode displayed excellent electrochemical robustness with a capacitance retention of 96.3% after 5000 charge/discharge cycles.

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Section: Resultssupporting

confidence: 58%

Two-Dimensional SnO₂-ZnO Nanohybrid Electrode Fabricated via Atomic Layer Deposition for Electrochemical Supercapacitors

Lopa

Akbari

et al. 2023

Energy Fuels

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“…The peak contribution areas of O lat and O vac were 85.70 % and 14.30 %, respectively. This moderately high percentage of O vac in 2D SnO 2 -In 2 O 3 heterostructure is beneficial for obtaining high capacitance in ESCs [44].…”

Section: Xps Analysesmentioning

confidence: 95%

ALD-fabricated two-dimensional SnO2-In2O3 n-n nanohybrid electrode for electrochemical supercapacitors

Lopa

Akbari²,

Zhuiykov³

2022

Electrochimica Acta

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“…have been extensively studied with different nanostructures for supercapacitor electrode material. Some nanostructured spinel cobaltites such as MnCo 2 O 4 , 17 ZnCo 2 O 4 , 18 NiCo 2 O 4 , 19 MgCo 2 O 4 , 20 FeCo 2 O 4 , 21 etc. were reported with good energy storage performance.…”

Section: Introducitonmentioning

confidence: 99%

Facile synthesis of MgCo ₂ O ₄ hexagonal nanostructure via co‐precipitation approach and its supercapacitive properties

Bhagwan

Krishna

2022

Intl J of Energy Research

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Summary Magnesium cobalt oxide (MgCo2O4) hexagonal nanoplates were prepared via a fast and simple co‐precipitation process. The electrochemical properties of MgCo2O4 nanostructures were characterized by various techniques. Furthermore, the MgCo2O4 hexagonal nanoplate material was used for supercapacitors. In three‐electrode scheme, MgCo2O4 hexagonal nanoplate electrode demonstrated a good specific capacity of 164 mAh g−1 at 3 A g−1. Furthermore, an aqueous asymmetric supercapacitor (ASC) using MgCo2O4//activated carbon (AC) was also fabricated. The MgCo2O4//AC delivered 39 mAh g−1 of specific capacity at 1 A g−1. It revealed the high energy density of 28.34 W h kg−1 with the power density of 363 W kg−1 with the current density of 0.5 A g−1. The impressive electrochemical performance is mainly associated to high surface area of 55 m2 g−1 resulted from voids/gaps in‐between hexagonal nanoplates of MgCo2O4. Also, a toy motor fan, 11 light‐emitting diodes (LEDs), and a kitchen timer were functionalized by series linked two ASCs for practical applications.

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Oxygen vacancies enhancing capacitance of MgCo2O4 for high performance asymmetric supercapacitors

Cited by 46 publications

References 57 publications

Two-Dimensional SnO₂-ZnO Nanohybrid Electrode Fabricated via Atomic Layer Deposition for Electrochemical Supercapacitors

Two-Dimensional SnO₂-ZnO Nanohybrid Electrode Fabricated via Atomic Layer Deposition for Electrochemical Supercapacitors

ALD-fabricated two-dimensional SnO2-In2O3 n-n nanohybrid electrode for electrochemical supercapacitors

Facile synthesis of MgCo ₂ O ₄ hexagonal nanostructure via co‐precipitation approach and its supercapacitive properties

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Oxygen vacancies enhancing capacitance of MgCo2O4 for high performance asymmetric supercapacitors

Cited by 46 publications

References 57 publications

Two-Dimensional SnO2-ZnO Nanohybrid Electrode Fabricated via Atomic Layer Deposition for Electrochemical Supercapacitors

Two-Dimensional SnO2-ZnO Nanohybrid Electrode Fabricated via Atomic Layer Deposition for Electrochemical Supercapacitors

ALD-fabricated two-dimensional SnO2-In2O3 n-n nanohybrid electrode for electrochemical supercapacitors

Facile synthesis of MgCo 2 O 4 hexagonal nanostructure via co‐precipitation approach and its supercapacitive properties

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About

Two-Dimensional SnO₂-ZnO Nanohybrid Electrode Fabricated via Atomic Layer Deposition for Electrochemical Supercapacitors

Two-Dimensional SnO₂-ZnO Nanohybrid Electrode Fabricated via Atomic Layer Deposition for Electrochemical Supercapacitors

Facile synthesis of MgCo ₂ O ₄ hexagonal nanostructure via co‐precipitation approach and its supercapacitive properties