A Novel Phase‐Transformation Activation Process toward Ni–Mn–O Nanoprism Arrays for 2.4 V Ultrahigh‐Voltage Aqueous Supercapacitors

Zuo, Wenhua; Xie, Chaoyue; Xu, Ping; Li, Yuanyuan; Liu, Jinping

doi:10.1002/adma.201703463

Cited by 249 publications

(158 citation statements)

References 57 publications

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“…[13] Given by this equation, the energy density is proportional to the square of operating voltage window. [14] Most recently, layered polyanionic phosphates, such as VOPO 4 , Na 3 V 2 (PO 4 ) 3 , NaVOPO 4 , KVPO 4 F, and KVOPO 4 , have been considered as promising electrode materials for energy storage because of their high thermal and structural stability. [14] Most recently, layered polyanionic phosphates, such as VOPO 4 , Na 3 V 2 (PO 4 ) 3 , NaVOPO 4 , KVPO 4 F, and KVOPO 4 , have been considered as promising electrode materials for energy storage because of their high thermal and structural stability.…”

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confidence: 99%

Novel Sub‐5 nm Layered Niobium Phosphate Nanosheets for High‐Voltage, Cation‐Intercalation Typed Electrochemical Energy Storage in Wearable Pseudocapacitors

Jiang

Tian

et al. 2019

Advanced Energy Materials

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A series of advanced progress has been made toward flexible supercapacitor design in recent years, including micro-SCs based on serpentine interconnections, [8] fiber-shaped SCs, [9] and the devices based on new crumpled-graphene papers, [10] tricot weave, [11] hierarchically buckled sheah-core fibers. [12] Nevertheless, the practical application of WSSPs is still limited by their low energy density. [13] According to the equation of energy density E = 1/2 C V 2 , for a given supercapacitor (SC), the energy density highly depends on the specific capacitance (C) and operating voltage window (V). [13] Given by this equation, the energy density is proportional to the square of operating voltage window. In general, the electrochemical stability window of most energystorage materials is less than 0.8 V in aqueous electrolytes due to the water splitting at 1.23 V, and high-voltage materials is highly desired to enhance the energy density. [14] Most recently, layered polyanionic phosphates, such as VOPO 4 , Na 3 V 2 (PO 4 ) 3 , NaVOPO 4 , KVPO 4 F, and KVOPO 4 , have been considered as promising electrode materials for energy storage because of their high thermal and structural stability. [15] More importantly, it has been theoretically predicted a much higher potential (≈1.0 V in aqueous electrolyte) in layered phosphates than in most of the traditional pseudocapacitive materials due to the enhanced iconicity of metaloxygen bond with the existence of [PO 4 ] 3− group. [16][17][18][19] Meanwhile, niobium (Nb) is an important transition metal element with rich oxidation states (Nb 3+ , Nb 4+ , and Nb 5+ ) for potential electrochemical energy storage. A unique Li + -intercalation pseudocapacitance has been found in T-Nb 2 O 5 (40 µm thick) electrode, which holds a great perspective on the development of electrochemical electrodes. [20,21] Especially, the pseudocapacitance occurs in the T-Nb 2 O 5 bulk rather than the surface or near-surface of the electrode, resulting high specific capacitances and energy density. [20] These interesting results inspire us to consider whether Nb atoms could be intercalated into the layered polyanionic phosphate to form layered niobium phosphate as high-performance electrode materials for WSSPs.

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confidence: 99%

Novel Sub‐5 nm Layered Niobium Phosphate Nanosheets for High‐Voltage, Cation‐Intercalation Typed Electrochemical Energy Storage in Wearable Pseudocapacitors

Jiang

Tian

et al. 2019

Advanced Energy Materials

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“…

the demands for energy storage and conversion systems of high energy and power density increase rapidly. [8][9][10][11][12][13] For example, nickel hydroxides (Ni(OH) 2 ) have been successfully used in rechargeable alkaline batteries (due to their low-cost and high capacity) [5,14] and in hybrid supercapacitors (due to high rate capability). [8][9][10][11][12][13] For example, nickel hydroxides (Ni(OH) 2 ) have been successfully used in rechargeable alkaline batteries (due to their low-cost and high capacity) [5,14] and in hybrid supercapacitors (due to high rate capability).

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mentioning

confidence: 99%

Rational Design of Nickel Hydroxide‐Based Nanocrystals on Graphene for Ultrafast Energy Storage

Zhao

Zhang

et al. 2017

Advanced Energy Materials

218

111

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the demands for energy storage and conversion systems of high energy and power density increase rapidly. To meet the everincreasing demands, transition metal compounds have been widely studied as catalysts for chemical and energy transformation processes (e.g., oxygen reduction and evolution reaction) [1][2][3][4] and as electrode materials for rechargeable batteries [5][6][7] and supercapacitors. [8][9][10][11][12][13] For example, nickel hydroxides (Ni(OH) 2 ) have been successfully used in rechargeable alkaline batteries (due to their low-cost and high capacity) [5,14] and in hybrid supercapacitors (due to high rate capability). [15] Hybrid supercapacitors, composed of a capacitive electrode and a battery-type Faradaic electrode, have demonstrated significantly higher energy density than conventional carbon-based electrical double-layer capacitors (EDLCs), due largely to the higher capacity of the battery-type electrode and the broader voltage window of the electrode pair. [16][17][18][19][20] Moreover, hybrid supercapacitors can achieve much higher power density than rechargeable batteries. Typically, one electrode of a hybrid supercapacitor is a carbon-based material whereas the other electrode (i.e., battery-type electrode) is a lithium electroactive material (such as Sn [16] and Li 4 Ti 5 O 12 [21] ) or an anionic redox active transition metal-based oxide/hydroxide. [15,22] As a promising battery-type electrode for hybrid supercapacitor in alkaline electrolyte, Ni(OH) 2 usually exhibits a pair of distinctly separated Faradaic redox peaks due to its phase transition. [23] This material was widely reported as a "pseudocapacitive" material for supercapacitors in the past decade, [24][25][26][27][28][29][30] but has recently been regarded as a battery-type material because of its batterytype behavior in alkaline media. [31][32][33] However, Ni(OH) 2 electrodes usually suffer from an irreversible phase transition, [34,35] large volume variation, [14] and low electronic conductivity, [36] resulting in poor durability and limited rate capability.Numerous efforts have been devoted to addressing the above issues. In order to enhance the electronic conductivity, an electronically conductive second phase has been introduced [15,24,37] or Ni(OH) 2 has been grown on a conductive substrate. [28,38,39] As a highly conductive two-demonstrational material with high surface area, graphene is an ideal substrate to improve the electronic conductivity of Ni(OH) 2 . [15,24,40] To further improve Compact, light, and powerful energy storage devices are urgently needed for many emerging applications; however, the development of advanced power sources relies heavily on advances in materials innovation. Here, the findings in rational design, one-pot synthesis, and characterization of a series of Ni hydroxide-based electrode materials in alkaline media for fast energy storage are reported. Under the guidance of density functional theory calculations and experimental investigations, a composite electrode composed of Co-/Mn-substituted...

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“…[117a] This device displayed energy densities of 59.75 and 11.33 Wh kg −1 at power densities of 1464 and 14 880 W kg −1 , respectively, in a voltage window of 1 V, with no significant capacity loss after 50 000 cycles. [118] This design was based on the formation of Ni 0.25 Mn 0.75 O @ C electrode with high oxygen evolution potential and displayed electrochemical response in the potential range of 0-1.4 V. Thus, an asymmetric cell made of activated carbon||Ni 0.25 Mn 0.75 O @C in LiCl-PVA electrolyte (Figure 13i,j) could operate in a working voltage window of 2.4 V (Figure 13k), delivering high energy and power densities (Figure 13l). [117b] It delivered energy densities of 45.2 and 37.0 Wh kg −1 at power densities of 400 and 6400 W kg −1 , respectively, within the working voltage window of 1.6 V and the capacity retention was 96.5% after 3000 cycles.…”

Section: Carbon||metal Oxide/hydroxide Supercapacitorsmentioning

confidence: 99%

Metal Oxide and Hydroxide–Based Aqueous Supercapacitors: From Charge Storage Mechanisms and Functional Electrode Engineering to Need‐Tailored Devices

2019

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Energy storage devices that efficiently use energy, in particular renewable energy, are being actively pursued. Aqueous redox supercapacitors, which operate in high ionic conductivity and environmentally friendly aqueous electrolytes, storing and releasing high amounts of charge with rapid response rate and long cycling life, are emerging as a solution for energy storage applications. At the core of these devices, electrode materials and their assembling into rational configurations are the main factors governing the charge storage properties of supercapacitors. Redox‐active metal compounds, particularly oxides and hydroxides that store charge via reversible valence change redox reactions with electrolyte ions, are prospective candidates to optimize the electrochemical performance of supercapacitors. To address this target, collaborative investigations, addressing different streams, from fundamental charge storage mechanisms and electrode materials engineering to need‐tailored device assemblies, are the key. Over the last few years, significant achievements in metal oxide and hydroxide–based aqueous supercapacitors have been reported. This work discusses the most recent achievements and trends in this field and brings into the spotlight the authors' viewpoints.

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A Novel Phase‐Transformation Activation Process toward Ni–Mn–O Nanoprism Arrays for 2.4 V Ultrahigh‐Voltage Aqueous Supercapacitors

Cited by 249 publications

References 57 publications

Novel Sub‐5 nm Layered Niobium Phosphate Nanosheets for High‐Voltage, Cation‐Intercalation Typed Electrochemical Energy Storage in Wearable Pseudocapacitors

Novel Sub‐5 nm Layered Niobium Phosphate Nanosheets for High‐Voltage, Cation‐Intercalation Typed Electrochemical Energy Storage in Wearable Pseudocapacitors

Rational Design of Nickel Hydroxide‐Based Nanocrystals on Graphene for Ultrafast Energy Storage

Metal Oxide and Hydroxide–Based Aqueous Supercapacitors: From Charge Storage Mechanisms and Functional Electrode Engineering to Need‐Tailored Devices

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