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Achieving Insertion‐Like Capacity at Ultrahigh Rate via Tunable Surface Pseudocapacitance

The insertion/deinsertion mechanism enables plenty of charge‐storage sites in the bulk phase to be accessible to intercalated ions, giving rise to at least one more order of magnitude higher energy density than the adsorption/desorption mechanism. However, the sluggish ion diffusion in the bulk phas... Full description

Journal Title: Advanced Materials March 2018, Vol.30(12), pp.n/a-n/a
Main Author: Zhai, Teng
Other Authors: Sun, Shuo , Liu, Xiaojing , Liang, Chaolun , Wang, Gongming , Xia, Hui
Format: Electronic Article Electronic Article
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ID: ISSN: 0935-9648 ; E-ISSN: 1521-4095 ; DOI: 10.1002/adma.201706640
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recordid: wj10.1002/adma.201706640
title: Achieving Insertion‐Like Capacity at Ultrahigh Rate via Tunable Surface Pseudocapacitance
format: Article
creator:
  • Zhai, Teng
  • Sun, Shuo
  • Liu, Xiaojing
  • Liang, Chaolun
  • Wang, Gongming
  • Xia, Hui
subjects:
  • Chemical Adsorption
  • Dual Ions
  • Hematite
  • Oxygen Vacancies
  • Supercapacitors
  • Ultrahigh Rate
ispartof: Advanced Materials, March 2018, Vol.30(12), pp.n/a-n/a
description: The insertion/deinsertion mechanism enables plenty of charge‐storage sites in the bulk phase to be accessible to intercalated ions, giving rise to at least one more order of magnitude higher energy density than the adsorption/desorption mechanism. However, the sluggish ion diffusion in the bulk phase leads to several orders of magnitude slower charge‐transport kinetics. An ideal energy‐storage device should possess high power density and large energy density simultaneously. Herein, surface‐modified FeO quantum dots anchored on graphene nanosheets are developed and exhibit greatly enhanced pseudocapacitance via fast dual‐ion‐involved redox reactions with both large specific capacity and fast charge/discharge capability. By using an aqueous NaSO electrolyte, the oxygen‐vacancy‐tuned FeO surface greatly enhances the absorption of SO anions that majorly increase the surface pseudocapacitance. Significantly, the FeO‐based electrode delivers a high specific capacity of 749 C g at 5 mV s and retains 290 C g at an ultrahigh scan rate of 3.2 V s. With a novel dual‐electrolyte design, a 2 V FeO/NaSO//MnO/NaSO asymmetric supercapacitor is constructed, delivering a high energy density of 75 W h kg at a power density of 3125 W kg. is achieved by surface‐modified FeO quantum dots anchored on graphene nanosheets, exhibiting greatly enhanced pseudocapacitance via fast dual‐ion‐involved redox reactions and fast charge/discharge capability. Significantly, the electrode achieves a high capacity up to 749 C g in the NaSO electrolytes and retains 290 C g at an ultrahigh scan rate of 3.2 V s.
language:
source:
identifier: ISSN: 0935-9648 ; E-ISSN: 1521-4095 ; DOI: 10.1002/adma.201706640
fulltext: fulltext
issn:
  • 0935-9648
  • 09359648
  • 1521-4095
  • 15214095
url: Link


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titleAchieving Insertion‐Like Capacity at Ultrahigh Rate via Tunable Surface Pseudocapacitance
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subjectChemical Adsorption ; Dual Ions ; Hematite ; Oxygen Vacancies ; Supercapacitors ; Ultrahigh Rate
descriptionThe insertion/deinsertion mechanism enables plenty of charge‐storage sites in the bulk phase to be accessible to intercalated ions, giving rise to at least one more order of magnitude higher energy density than the adsorption/desorption mechanism. However, the sluggish ion diffusion in the bulk phase leads to several orders of magnitude slower charge‐transport kinetics. An ideal energy‐storage device should possess high power density and large energy density simultaneously. Herein, surface‐modified FeO quantum dots anchored on graphene nanosheets are developed and exhibit greatly enhanced pseudocapacitance via fast dual‐ion‐involved redox reactions with both large specific capacity and fast charge/discharge capability. By using an aqueous NaSO electrolyte, the oxygen‐vacancy‐tuned FeO surface greatly enhances the absorption of SO anions that majorly increase the surface pseudocapacitance. Significantly, the FeO‐based electrode delivers a high specific capacity of 749 C g at 5 mV s and retains 290 C g at an ultrahigh scan rate of 3.2 V s. With a novel dual‐electrolyte design, a 2 V FeO/NaSO//MnO/NaSO asymmetric supercapacitor is constructed, delivering a high energy density of 75 W h kg at a power density of 3125 W kg. is achieved by surface‐modified FeO quantum dots anchored on graphene nanosheets, exhibiting greatly enhanced pseudocapacitance via fast dual‐ion‐involved redox reactions and fast charge/discharge capability. Significantly, the electrode achieves a high capacity up to 749 C g in the NaSO electrolytes and retains 290 C g at an ultrahigh scan rate of 3.2 V s.
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descriptionThe insertion/deinsertion mechanism enables plenty of charge‐storage sites in the bulk phase to be accessible to intercalated ions, giving rise to at least one more order of magnitude higher energy density than the adsorption/desorption mechanism. However, the sluggish ion diffusion in the bulk phase leads to several orders of magnitude slower charge‐transport kinetics. An ideal energy‐storage device should possess high power density and large energy density simultaneously. Herein, surface‐modified FeO quantum dots anchored on graphene nanosheets are developed and exhibit greatly enhanced pseudocapacitance via fast dual‐ion‐involved redox reactions with both large specific capacity and fast charge/discharge capability. By using an aqueous NaSO electrolyte, the oxygen‐vacancy‐tuned FeO surface greatly enhances the absorption of SO anions that majorly increase the surface pseudocapacitance. Significantly, the FeO‐based electrode delivers a high specific capacity of 749 C g at 5 mV s and retains 290 C g at an ultrahigh scan rate of 3.2 V s. With a novel dual‐electrolyte design, a 2 V FeO/NaSO//MnO/NaSO asymmetric supercapacitor is constructed, delivering a high energy density of 75 W h kg at a power density of 3125 W kg. is achieved by surface‐modified FeO quantum dots anchored on graphene nanosheets, exhibiting greatly enhanced pseudocapacitance via fast dual‐ion‐involved redox reactions and fast charge/discharge capability. Significantly, the electrode achieves a high capacity up to 749 C g in the NaSO electrolytes and retains 290 C g at an ultrahigh scan rate of 3.2 V s.
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abstractThe insertion/deinsertion mechanism enables plenty of charge‐storage sites in the bulk phase to be accessible to intercalated ions, giving rise to at least one more order of magnitude higher energy density than the adsorption/desorption mechanism. However, the sluggish ion diffusion in the bulk phase leads to several orders of magnitude slower charge‐transport kinetics. An ideal energy‐storage device should possess high power density and large energy density simultaneously. Herein, surface‐modified FeO quantum dots anchored on graphene nanosheets are developed and exhibit greatly enhanced pseudocapacitance via fast dual‐ion‐involved redox reactions with both large specific capacity and fast charge/discharge capability. By using an aqueous NaSO electrolyte, the oxygen‐vacancy‐tuned FeO surface greatly enhances the absorption of SO anions that majorly increase the surface pseudocapacitance. Significantly, the FeO‐based electrode delivers a high specific capacity of 749 C g at 5 mV s and retains 290 C g at an ultrahigh scan rate of 3.2 V s. With a novel dual‐electrolyte design, a 2 V FeO/NaSO//MnO/NaSO asymmetric supercapacitor is constructed, delivering a high energy density of 75 W h kg at a power density of 3125 W kg. is achieved by surface‐modified FeO quantum dots anchored on graphene nanosheets, exhibiting greatly enhanced pseudocapacitance via fast dual‐ion‐involved redox reactions and fast charge/discharge capability. Significantly, the electrode achieves a high capacity up to 749 C g in the NaSO electrolytes and retains 290 C g at an ultrahigh scan rate of 3.2 V s.
doi10.1002/adma.201706640
orcididhttp://orcid.org/0000-0002-2517-2410
pages1-9
date2018-03