An Ultralong, Highly Oriented Nickel‐Nanowire‐Array Electrode Scaffold for High‐Performance Compressible Pseudocapacitors

Chen, Xu; Li, Ziheng; Yang, Cheng; Zou, Peichao; Xie, Binghe; Lin, Ziyin; Zhang, Zhexu; Li, Baohua; Kang, Feiyu; Wong, Ching‐Ping

doi:10.1002/adma.201602720

Cited by 14 publications

(14 citation statements)

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“…Generally, SCs are divided into two categories; one, referred to as electric double‐layer capacitors (EDLCs), is based on the accumulation of electrolyte ions near the surface of electrode materials in the form of electrical double layer (EDL), and the other one, referred to as pseudo‐capacitor, involves “reversible” Faradic reaction and is mainly based on either metal oxides or conductive polymers . Recently, there has been great interest in pseudo‐capacitors due to their relatively higher Faradic capacitances than EDLCs .…”

Section: Introductionmentioning

confidence: 99%

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

et al. 2019

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Summary In this work, we prepare a series of activated carbons (ACs) from xylose with different combinations of hydrothermal synthesis (HTS) and chemical activation with KOH. The prepared ACs exhibit a variety of morphologies and porous structures, which depend on the conditions used in the hydrothermal synthesis and the chemical activation. The largest surface area (SBET) of the prepared ACs, which is calculated by the Brunauere Emmette Teller (BET) method, is ~3500 m2/g, and the largest volume fraction of mesopores of the prepared ACs is 60%. The correlations between the specific electrochemical properties of the ACs and the structures of the ACs (ie, porous structures and morphologies) are discussed. Spherical ACs exhibit superior rate performance with low impedance. The ACs with three‐dimensional interconnected network of large surface area and porosity possess high specific capacitance. The largest specific capacitance reaches 340 F/g at a current density of 0.5 A/g and 220 F/g at a current density of 50 A/g, which are superior or comparable to those of similar systems. The long‐term capacitance retention is ~86.8% after 10 000 cycles at a current density of 50 A/g. The energy density reaches 48 Wh/kg at a power density of 13.6 kW/kg.

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Section: Introductionmentioning

confidence: 99%

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

et al. 2019

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“…[189][190][191] Intercalation pseudocapacitances of 2D nanosheets emerge when ions intercalate into the tunnels or layers of a redox-active material accompanied by Faradaic charge-transfer with no crystallographic phase change, as defined in Section 2. [189][190][191] Intercalation pseudocapacitances of 2D nanosheets emerge when ions intercalate into the tunnels or layers of a redox-active material accompanied by Faradaic charge-transfer with no crystallographic phase change, as defined in Section 2.…”

Section: Intercalation Pseudocapacitancementioning

confidence: 99%

“…Despite high theoretical capacitance (1450 F g −1 ) of RuO 2 , other transition metal oxides and hydroxides such as Co 3 O 4 , [189] MnO 2 , [199] TiO 2 , [195] Mn 3 O 4 , [200] Fe 3 O 4 , [22] and Nb 2 O 5 [24] have been investigated as an alternative candidate because of the limitation of high cost and scarcity. [191] Even for intrinsic pseudocapacitance, nanostructuring is effective for improving the utilization of redox active sites at nonequilibrium status. [199,[201][202][203] The surface redox reaction of MnO 2 in aqueous electrolytes is associated with the change in the oxidation state of the redox couple Mn +4/+3 at the surface or in the bulk.…”

Section: Transition Metal Oxide and Hydroxidesmentioning

confidence: 99%

“…2D nanosheets, especially metal hydroxides or oxides, with ultrahigh specific surface areas are attractive electrodes for high‐performance pseudocapacitors . Intercalation pseudocapacitances of 2D nanosheets emerge when ions intercalate into the tunnels or layers of a redox‐active material accompanied by Faradaic charge–transfer with no crystallographic phase change, as defined in Section .…”

Section: Intercalation Pseudocapacitancementioning

confidence: 99%

“…Among intrinsic pseudocapacitive metal oxides, MnO 2 has been extensively investigated because of its low cost, environment friendless and high theoretical specific capacitance (≈1233 F g −1 ) . The surface redox reaction of MnO 2 in aqueous electrolytes is associated with the change in the oxidation state of the redox couple Mn +4/+3 at the surface or in the bulk . Even for intrinsic pseudocapacitance, nanostructuring is effective for improving the utilization of redox active sites at nonequilibrium status .…”

Section: Intercalation Pseudocapacitancementioning

confidence: 99%

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Emergent Pseudocapacitance of 2D Nanomaterials

Yun

Yeon

et al. 2018

Advanced Energy Materials

250

190

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naming of energy storage devices after their own core materials: conventional batteries such as lead-acid batteries, which are named after the lead-based active material and the acidic electrolyte; nickelcadmium batteries named after the nickeland cadmium-based active materials; nickel-metal hybrid batteries named after the nickel-and metal hydride-based active materials; state-of-the-art lithium-ion batteries (LIBs), named after the lithiated host materials and lithium-ion carriers; and next-generation batteries such as sodiumion, lithium-sulfur, and lithium-air batteries, which are named after the lithium metal anode and sulfur or O 2 cathode. [4][5][6][7][8][9] In short, whenever energy storage materials made a breakthrough, new-generation energy storage devices appeared. Among electrochemical energy storage devices, supercapacitors (SCs), which can store charges at the surface, have advantages over LIB and conventional batteries in terms of high power, fast charging/ discharging rates, and long cyclability, as will be discussed in Section 2.1. However, the low energy density of SCs remains a critical challenge for emerging applications such as next-generation electronic systems, electrical vehicles (EVs), and renewable energy storage systems (ESSs). [10,11] Based on the long history of energy storage research, new and emerging materials are expected to provide solutions to this problem.Returning to the chronological development of SCs, SCs have been revolutionized by the emergence of new materials, as Two dimensional (2D) nanomaterials are very attractive due to their unique structural and surface features for energy storage applications. Motivated by the recent pioneering works demonstrating "the emergent pseudocapacitance of 2D nanomaterials," the energy storage and nanoscience communities could revisit bulk layered materials though state-of-the-art nanotechnology such as nanostructuring, nanoarchitecturing, and compositional control. However, no review has focused on the fundamentals, recent progress, and outlook on this new mechanism of 2D nanomaterials yet. In this study, the key aspects of emergent pseudocapacitors based on 2D nanomaterials are comprehensively reviewed, which covers the history, classification, thermodynamic and kinetic aspects, electrochemical characteristics, and design guidelines of materials for extrinsically surface redox and intercalation pseudocapacitors. The structural and compositional controls of graphene and other carbon nanosheets, transition metal oxides and hydroxides, transition metal dichalcogenides, and metal carbide/nitride on both microscopic and macroscopic levels will be particularly addressed, emphasizing the important results published since 2010. Finally, perspectives on the current impediments and future directions of this field are offered. Unlimited combinations and modifications of 2D nanomaterials can provide a rational strategy to overcome intrinsic limitations of existing materials, offering a new-generation energy storage materials toward a high and new p...

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Insight into the role of interfacial reconstruction of manganese oxides toward enhanced electrochemical capacitors

Zhang

et al. 2020

Chemical Engineering Journal

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An Ultralong, Highly Oriented Nickel‐Nanowire‐Array Electrode Scaffold for High‐Performance Compressible Pseudocapacitors

Cited by 14 publications

References 0 publications

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

High‐performance activated carbons for electrochemical double layer capacitors: Effects of morphology and porous structures

Emergent Pseudocapacitance of 2D Nanomaterials

Insight into the role of interfacial reconstruction of manganese oxides toward enhanced electrochemical capacitors

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