Strongly coupled graphene/Mn 3 O 4 composite with enhanced electrochemical performance for supercapacitor electrode

Jin, Guizhen; Xiao, Xin; Li, Shun; Zhao, Kuangmin; Wu, Yuanzhan; Sun, Dan; Wang, Fen

doi:10.1016/j.electacta.2015.08.032

Cited by 97 publications

(22 citation statements)

References 51 publications

(64 reference statements)

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“…Clearly,t hose nanoparticles do not detach from HCF after ultrasonication for 20 min, which indicates strong interactions. Figure [36,37] that correspondt od ifferent chemical states of carbon, which may result from the insufficientd ecomposition of resorcinol-formaldehyde( RF) resin duringt he calcination process and oxidation by the solution of KMnO 4 .T wo peaks in the Mn 2p spectrum (Figure 4c)a re observed at around6 41.5 and6 53.4 eV,w hich are attributed to Mn 2p 3/2 and Mn 2p 1/2 ,r espectively.T he splitting width of 11.9 eV is in good agreement with earlierr eports on Mn 3 O 4 -based materials, [38,39] which further reveals that most nanoparticles on HCF are Mn 3 O 4 .T he O1sd econvoluted spectrum ( Figure 4d)c onsists of four binding energy peaks at 529.9 and 531.3 eV,w hich are ascribed to MnÀOÀMn and MnÀ OÀC, respectively. [40] The existence of MnÀOÀCd emonstrates the strong chemical interaction between Mn 3 O 4 nanoparticles and HCF,w hich is in agreement with the TEM results.…”

Section: Resultssupporting

confidence: 84%

“…Two peaks in the Mn 2 p spectrum (Figure c) are observed at around 641.5 and 653.4 eV, which are attributed to Mn 2p 3/2 and Mn 2p 1/2 , respectively. The splitting width of 11.9 eV is in good agreement with earlier reports on Mn 3 O 4 ‐based materials, which further reveals that most nanoparticles on HCF are Mn 3 O 4 . The O 1s deconvoluted spectrum (Figure d) consists of four binding energy peaks at 529.9 and 531.3 eV, which are ascribed to Mn−O−Mn and Mn−O−C, respectively .…”

Section: Resultsmentioning

confidence: 94%

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In Situ Synthesis of Mn₃O₄ Nanoparticles on Hollow Carbon Nanofiber as High‐Performance Lithium‐Ion Battery Anode

Zhang

Jiang

et al. 2018

Chemistry A European J

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The practical applications of Mn O in lithium-ion batteries are greatly hindered by fast capacity decay and poor rate performance as a result of significant volume changes and low electrical conductivity. It is believed that the synthesis of nanoscale Mn O combined with carbonaceous matrix will lead to a better electrochemical performance. Herein, a convenient route for the synthesis of Mn O nanoparticles grown in situ on hollow carbon nanofiber (denoted as HCF/Mn O ) is reported. The small size of Mn O particles combined with HCF can significantly alleviate volume changes and electrical conductivity; the strong chemical interactions between HCF and Mn O would improve the reversibility of the conversion reaction for MnO into Mn O and accelerate charge transfer. These features endow the HCF/Mn O composite with superior cycling stability and rate performance if used as the anode for lithium-ion batteries. The composite delivers a high discharge capacity of 835 mA h g after 100 cycles at 200 mA g , and 652 mA h g after 240 cycles at 1000 mA g . Even at 2000 mA g , it still shows a high capacity of 528 mA h g . The facile synthetic method and outstanding electrochemical performance of the as-prepared HCF/Mn O composite make it a promising candidate for a potential anode material for lithium-ion batteries.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 94%

In Situ Synthesis of Mn₃O₄ Nanoparticles on Hollow Carbon Nanofiber as High‐Performance Lithium‐Ion Battery Anode

Zhang

Jiang

et al. 2018

Chemistry A European J

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“…An interesting phenomenon in the Raman spectra is that the intensity of the D-band decreases with an increase of NCS in the composite,i ndicating that the existence of NCS is helpful to improve the ordered structure of RGO.F urthermore,aslight left-shift of the G-band of NCS@RGO composites was detected, owing to the improvement of reduction degree of RGO and the close contact between NCS and RGO. [30,31] Figure S4a (Supporting Information) presents the survey X-ray photoelectron spectroscopy (XPS) images of NCS@RGO-2, which confirms the presence of nickel, cobalt, sulfur, and carbon elements.Inthe Ni 2p XPS spectrum (Figure 2c), two peaks at 857.1 and 875.1 eV were fitted, which are attributed to the 2p 3/2 and 2p 1/2 core levels of Ni 3+ . [32] In the Co 2p XPS spectrum (Figure 2d), two peaks were fitted at 782.3 and 798.4 eV,w hich stem from the 2p 3/2 and 2p 1/2 core levels of Co 2+ .…”

Section: Resultsmentioning

confidence: 87%

A Robust Solid Electrolyte Interphase Layer Augments the Ion Storage Capacity of Bimetallic‐Sulfide‐Containing Potassium‐Ion Batteries

et al. 2019

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Metal-organic framework-derived NiCo 2.5 S 4 microrods wrapped in reduced graphene oxide (NCS@RGO) were synthesized for potassium-ion storage.Upon coordination with organic potassium salts,N CS@RGO exhibits an ultrahigh initial reversible specific capacity (602 mAh g À1 at 50 mA g À1 ) and ultralong cycle life (a reversible specific capacity of 495 mAh g À1 at 200 mA g À1 after 1900 cycles over 314 days). Furthermore,t he battery demonstrates ah igh initial Coulombic efficiency of 78 %, outperforming most sulfides reported previously.A dvanced ex situ characterization techniques,i ncluding atomic force microscopy, were used for evaluation and the results indicate that the organic potassium salt-containing electrolyte helps to form thin and robust solid electrolyte interphase layers,w hichr educe the formation of byproducts during the potassiation-depotassiation process and enhance the mechanical stability of electrodes.T he excellent conductivity of the RGO in the composites,a nd the robust interface between the electrodes and electrolytes,i mbue the electrode with useful properties;i ncluding,u ltrafast potassium-ion storage with areversible specific capacity of 402 mAh g À1 even at 2Ag À1 .

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“…This ability of EIS is the responsible that nowadays EIS has become a key experimental method in a large spectrum of fields [4]. This wide range of fields includes typically electrochemistry related fields as fuel cells [5][6][7][8][9][10][11][12], batteries [13][14][15][16][17], coatings [18][19][20], electrochemical sensors [21][22][23][24][25][26] and supercapacitors [27][28][29][30][31]. But it also includes fields not traditionally linked to electrochemistry as enzymatic kinetics [32], biochemistry [33][34][35], food quality control [36], cancer detection [37][38] and immunology [39][40], amongst others.…”

Section: Introductionmentioning

confidence: 99%

Application of a Montecarlo based quantitative Kramers-Kronig test for linearity assessment of EIS measurements

Giner-Sanz

Ortega

Pérez-Herranz

2016

Electrochimica Acta

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Electrochemical Impedance Spectroscopy (EIS) is a very powerful tool to study the behaviour of electrochemical systems. Three conditions must be fulfilled during EIS measurements: causality, linearity, and stability. If any of these conditions is not achieved, then the conclusions obtained from the analysis of the measured spectra may be biased, or even misguided. For this reason, the verification of the compliance of these conditions is critical before accepting any analysis performed on an experimental spectrum. In a previous work, an experimental spectrum quantitative validation technique based on Kramers-Kronig relations was presented. The validation method consists in a Kramers-Kronig (KK) validation test, by equivalent electrical circuit fitting, coupled with a Montecarlo error propagation method. The validation technique builds a consistency region for a given confidence level that allows to discriminate between the individual points of the EIS spectrum that are consistent with the four fundamental hypotheses, and the inconsistent ones. The aim of this work is to validate experimentally if the quantitative validation technique is able to detect nonlinearities. In order to achieve this goal, the EIS spectrum of a markedly nonlinear system was measured experimentally using different perturbation amplitudes. The validation technique was applied to each one of the measured spectra. The method successfully managed to identify large nonlinearities; but did not detect slight ones.

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Strongly coupled graphene/Mn 3 O 4 composite with enhanced electrochemical performance for supercapacitor electrode

Cited by 97 publications

References 51 publications

In Situ Synthesis of Mn₃O₄ Nanoparticles on Hollow Carbon Nanofiber as High‐Performance Lithium‐Ion Battery Anode

In Situ Synthesis of Mn₃O₄ Nanoparticles on Hollow Carbon Nanofiber as High‐Performance Lithium‐Ion Battery Anode

A Robust Solid Electrolyte Interphase Layer Augments the Ion Storage Capacity of Bimetallic‐Sulfide‐Containing Potassium‐Ion Batteries

Application of a Montecarlo based quantitative Kramers-Kronig test for linearity assessment of EIS measurements

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Strongly coupled graphene/Mn 3 O 4 composite with enhanced electrochemical performance for supercapacitor electrode

Cited by 97 publications

References 51 publications

In Situ Synthesis of Mn3O4 Nanoparticles on Hollow Carbon Nanofiber as High‐Performance Lithium‐Ion Battery Anode

In Situ Synthesis of Mn3O4 Nanoparticles on Hollow Carbon Nanofiber as High‐Performance Lithium‐Ion Battery Anode

A Robust Solid Electrolyte Interphase Layer Augments the Ion Storage Capacity of Bimetallic‐Sulfide‐Containing Potassium‐Ion Batteries

Application of a Montecarlo based quantitative Kramers-Kronig test for linearity assessment of EIS measurements

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In Situ Synthesis of Mn₃O₄ Nanoparticles on Hollow Carbon Nanofiber as High‐Performance Lithium‐Ion Battery Anode

In Situ Synthesis of Mn₃O₄ Nanoparticles on Hollow Carbon Nanofiber as High‐Performance Lithium‐Ion Battery Anode