Structure-designed synthesis of Cu-doped Co3O4@N-doped carbon with interior void space for optimizing alkali-ion storage

Kong, Huabin; Wu, Yueming; Hong, Weizhao; Yan, Chunshuang; Yu-qin, Zhao; Chen, Gang

doi:10.1016/j.ensm.2019.06.015

Cited by 74 publications

(27 citation statements)

References 36 publications

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“…In order to address these disadvantages, some strategies have been employed, such as coating with carbon materials or conducting polymers to enhance the conductivity and accommodate the large volume change during charge/discharge process [20][21][22]. However, the synthesis of coating layer is usually complicated [23] and the protection layer often ruptures under drastic volume change [24]. In addition, the intrinsic weak electrical conductivity of TMOs has not been changed.…”

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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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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“…And they return to almost their original positions without the doping of Li. As lithium has the smallest ionic radius among V, Li, and Zn, [ 21 ] it is expected that Li + can enter the interstitial space in Zn 3 V 3 O 8 /V 2 O 3 . To further test the degree of graphitization, Raman scattering spectra of LNZVO@C and LNZVO were tested.…”

Section: Resultsmentioning

confidence: 99%

Matched Facet‐Induced Microflower‐Like Li, Ni‐Codoped Zn₃V₃O₈/V₂O₃ Nanoplate Assemblies Grown on Bamboo‐Like Carbon Nanotube for High Energy Density Lithium‐Ion Capacitors

et al. 2020

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Herein, Li, Ni‐codoped Zn3V3O8/V2O3@bamboo‐like carbon nanotube (BCNT) is synthesized as an anode for a Li‐ion capacitor (LIC), which exhibits a high capacity and excellent cycling stability. The capacity retention is 91.0% after 2000 cycles at 5 A g−1. Meanwhile, the formation mechanism of the hierarchical morphology of LNZVO@C is investigated. It is expected that the formation of Zn3V3O8/V2O3 nanoplates is based on their matched d spacings, d(311)(Zn3V3O8) ≈ d(110)(V2O3). The lateral and radial (thickness) directions of the nanoplate are along Zn3V3O8 (311) and (111) facets, respectively. Density functional theory (DFT) calculations reveal that the Zn2VO4 (311/111) heterointerface is thermodynamically favorable, and its good stability is associated with the charge transfer from the V atoms on the (111) surface to the V atoms on the (311) surface. Although the existence of ZnV2O4 phase is not beneficial for the formation of ZnV2O4 (311)/(111) interface, it favors the improvement of electron conductivity. Meanwhile, a KOH‐activated BCNT is designed as the cathode for LIC, which shows a relatively high capacity. The LNZVO@C//FBCNT LIC with carbon nanotube–derived cathode and anode can provide high energy densities.

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“…For decades, tremendous research efforts have been devoted to study many candidates such as carbonaceous materials, [ 6 ] transition metal oxides, [ 7 ] and transition metal dichalcogenides [ 8 ] to replace graphite. Among them, tin [ 9 ] and tin‐based compounds such as SnO 2 , [ 10 ] SnS, [ 11 ] and SnSe 2 [ 12 ] have been investigated as promising SIB anode materials because of their relatively high theoretical capacities.…”

Section: Introductionmentioning

confidence: 99%

SeC Bonding Promoting Fast and Durable Na⁺ Storage in Yolk–Shell SnSe₂@SeC

Xiao

Liu

et al. 2020

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Tin‐based compounds have received much attention as anode materials for lithium/sodium ion batteries owing to their high theoretical capacity. However, the huge volume change usually leads to the pulverization of electrode, giving rise to a poor cycle performance, which have severely hampered their practical application. Herein, highly durable yolk–shell SnSe2 nanospheres (SnSe2@SeC) are prepared by a multistep templating method, with an in situ gas‐phase selenization of the SnO2@C hollow nanospheres. During this process, Se can be doped into the carbon shell with a tunable amount and form SeC bonds. Density functional theory calculation results reveal that the SeC bonding can enhance the charge transfer properties as well as the binding interaction between the SnSe2 core and the carbon shell, favoring an improved rate performance and a superior cyclability. As expected, the sample delivers reversible capacities of 441 and 406 mAh g−1 after 2000 cycles at 2 and 5 A g−1, respectively, as the anode material for a sodium‐ion battery. Such performances are significantly better than the control sample without the SeC bonding and also other metal selenide‐based anodes, evidently showing the advantage of Se doping in the carbon shell.

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Structure-designed synthesis of Cu-doped Co3O4@N-doped carbon with interior void space for optimizing alkali-ion storage

Cited by 74 publications

References 36 publications

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

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

Matched Facet‐Induced Microflower‐Like Li, Ni‐Codoped Zn₃V₃O₈/V₂O₃ Nanoplate Assemblies Grown on Bamboo‐Like Carbon Nanotube for High Energy Density Lithium‐Ion Capacitors

SeC Bonding Promoting Fast and Durable Na⁺ Storage in Yolk–Shell SnSe₂@SeC

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Structure-designed synthesis of Cu-doped Co3O4@N-doped carbon with interior void space for optimizing alkali-ion storage

Cited by 74 publications

References 36 publications

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

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

Matched Facet‐Induced Microflower‐Like Li, Ni‐Codoped Zn3V3O8/V2O3 Nanoplate Assemblies Grown on Bamboo‐Like Carbon Nanotube for High Energy Density Lithium‐Ion Capacitors

SeC Bonding Promoting Fast and Durable Na+ Storage in Yolk–Shell SnSe2@SeC

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Matched Facet‐Induced Microflower‐Like Li, Ni‐Codoped Zn₃V₃O₈/V₂O₃ Nanoplate Assemblies Grown on Bamboo‐Like Carbon Nanotube for High Energy Density Lithium‐Ion Capacitors

SeC Bonding Promoting Fast and Durable Na⁺ Storage in Yolk–Shell SnSe₂@SeC