Aqueous Supercapacitor with Ultrahigh Voltage Window Beyond 2.0 Volt

Liu, Ji‐Chi; Huang, Zi‐Hang; Ma, Tianyi

doi:10.1002/sstr.202000020

Cited by 99 publications

(61 citation statements)

References 88 publications

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“…However, concerns on LIBs such as short cycling lifespan, thermal instability and increasing scarcity of metal lithium have been raised, which have inspired the research and development of next-generational ESDs. [1][2][3][4][5][6] Based on either ion adsorption and desorption on interface (electrical double-layer capacitors (EDLCs)) or rapid redox reactions (pseudocapacitors (PCs)) to store energy, [7] supercapacitors (SCs) have been attracting growing research and industrial interest in recent years among these promising ESDs, mainly due to their high Graphene-based supercapacitors have been attracting growing attention due to the predicted intrinsic high surface area, high electron mobility, and many other excellent properties of pristine graphene. However, experimentally, the state-of-the-art graphene electrodes face limitations such as low surface area, low electrical conductivity, and low capacitance, which greatly limit their electrochemical performances for supercapacitor applications.…”

Section: Introductionmentioning

confidence: 99%

Hybridized Graphene for Supercapacitors: Beyond the Limitation of Pure Graphene

Zhang

Yang

Lau

et al. 2021

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105

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Graphene‐based supercapacitors have been attracting growing attention due to the predicted intrinsic high surface area, high electron mobility, and many other excellent properties of pristine graphene. However, experimentally, the state‐of‐the‐art graphene electrodes face limitations such as low surface area, low electrical conductivity, and low capacitance, which greatly limit their electrochemical performances for supercapacitor applications. To tackle these issues, hybridizing graphene with other species (e.g., atom, cluster, nanostructure, etc.) to enlarge the surface area, enhance the electrical conductivity, and improve capacitance behaviors are strongly desired. In this review, different hybridization principles (spacers hybridization, conductors hybridization, heteroatoms doping, and pseudocapacitance hybridization) are discussed to provide fundamental guidance for hybridization approaches to solve these challenges. Recent progress in hybridized graphene for supercapacitors guided by the above principles are thereafter summarized, pushing the performance of hybridized graphene electrodes beyond the limitation of pure graphene materials. In addition, the current challenges of energy storage using hybridized graphene and their future directions are discussed.

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Section: Introductionmentioning

confidence: 99%

Hybridized Graphene for Supercapacitors: Beyond the Limitation of Pure Graphene

Zhang

Yang

Lau

et al. 2021

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105

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“…Supercapacitors (SCs), owing to the merit of fast charge/discharge rate, ultralong life span and high power output, have aroused enormous attentions [6][7][8][9]. Carbon materials, conducting polymers and transition metal oxides (TMOs) are the most widely used electrode materials in SCs [10][11][12]. Particularly, TMOs, such as CoO [13,14], Co 3 O 4 [15], NiO [16] and Fe 3 O 4 [17], deliver much higher specific capacitance than that of carbon materials and conductive polymers benefiting from the multiple reversible faradaic redox reactions.…”

Section: Introductionmentioning

confidence: 99%

Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor

et al. 2021

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Although CoO is a promising electrode material for supercapacitors due to its high theoretical capacitance, the practical applications still suffering from inferior electrochemical activity owing to its low electrical conductivity, poor structural stability and inefficient nanostructure. Herein, we report a novel Cu0/Cu+ co-doped CoO composite with adjustable metallic Cu0 and ion Cu+ via a facile strategy. Through interior (Cu+) and exterior (Cu0) decoration of CoO, the electrochemical performance of CoO electrode has been significantly improved due to both the beneficial flower-like nanostructure and the synergetic effect of Cu0/Cu+ co-doping, which results in a significantly enhanced specific capacitance (695 F g−1 at 1 A g−1) and high cyclic stability (93.4% retention over 10,000 cycles) than pristine CoO. Furthermore, this co-doping strategy is also applicable to other transition metal oxide (NiO) with enhanced electrochemical performance. In addition, an asymmetric hybrid supercapacitor was assembled using the Cu0/Cu+ co-doped CoO electrode and active carbon, which delivers a remarkable maximal energy density (35 Wh kg−1), exceptional power density (16 kW kg−1) and ultralong cycle life (91.5% retention over 10,000 cycles). Theoretical calculations further verify that the co-doping of Cu0/Cu+ can tune the electronic structure of CoO and improve the conductivity and electron transport. This study demonstrates a facile and favorable strategy to enhance the electrochemical performance of transition metal oxide electrode materials.

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“…In the past few years, the construction of heterogeneous interfaces during the synthesis of TMCs crystals has aroused extensive research interests due to its improved high ion carrier mobility and broad electrode potential, mainly because the unique structure can decrease the activity of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at high voltage window [144][145][146][147]. For example, the NiFeP@NiCo 2 S 4 /carbon cloth (NiFeP@NiCo 2 S 4 /CC) hybrid electrode with NiFeP@NiCo 2 S 4 heterostructure was successfully manufactured by using a novel combination of hydrothermal reaction, phosphorization treatment, and electrodeposition technique strategy (Fig.…”

Section: Heterogeneous Interfacementioning

confidence: 99%

Recent Developments of Transition Metal Compounds-Carbon Hybrid Electrodes for High Energy/Power Supercapacitors

et al. 2021

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Due to their rapid power delivery, fast charging, and long cycle life, supercapacitors have become an important energy storage technology recently. However, to meet the continuously increasing demands in the fields of portable electronics, transportation, and future robotic technologies, supercapacitors with higher energy densities without sacrificing high power densities and cycle stabilities are still challenged. Transition metal compounds (TMCs) possessing high theoretical capacitance are always used as electrode materials to improve the energy densities of supercapacitors. However, the power densities and cycle lives of such TMCs-based electrodes are still inferior due to their low intrinsic conductivity and large volume expansion during the charge/discharge process, which greatly impede their large-scale applications. Most recently, the ideal integrating of TMCs and conductive carbon skeletons is considered as an effective solution to solve the above challenges. Herein, we summarize the recent developments of TMCs/carbon hybrid electrodes which exhibit both high energy/power densities from the aspects of structural design strategies, including conductive carbon skeleton, interface engineering, and electronic structure. Furthermore, the remaining challenges and future perspectives are also highlighted so as to provide strategies for the high energy/power TMCs/carbon-based supercapacitors.

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Aqueous Supercapacitor with Ultrahigh Voltage Window Beyond 2.0 Volt

Cited by 99 publications

References 88 publications

Hybridized Graphene for Supercapacitors: Beyond the Limitation of Pure Graphene

Hybridized Graphene for Supercapacitors: Beyond the Limitation of Pure Graphene

Interior and Exterior Decoration of Transition Metal Oxide Through Cu0/Cu+ Co-Doping Strategy for High-Performance Supercapacitor

Recent Developments of Transition Metal Compounds-Carbon Hybrid Electrodes for High Energy/Power Supercapacitors

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