MnO2 by XPS

Stranick, Michael

doi:10.1116/1.1247888

Cited by 118 publications

(71 citation statements)

References 5 publications

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“…The X-ray photoelectron spectroscopy (XPS) spectrum of 4-fold-symmetry HMNTAs (Figure 1 b) indicates that there are four elements (Mn, O, K, and C) in the product where the C signal may be attributed to adventitious carbon during the measurement. Insets give the Mn 2p and O1s spectra of the HMNTAs, respectively, [ 34 ] which are in good agreement with previous studies in α-MnO 2 , [ 35,36 ] indicating that the Mn 4+ ions are dominant in the HMNTAs. Element analysis by XPS reveals that the atomic ratio of Mn to O is close to 1:2, which is consistent with energy dispersive spectroscopy (EDS) results ( Figure S2, Supporting Information).…”

Section: Synthesis and Characterization Of The Hmntassupporting

confidence: 84%

Hierarchical α‐MnO₂ Tube‐on‐Tube Arrays with Superior, Structure‐Dependent Pseudocapacitor Performance Synthesized via a Selective Dissolution and Coherent Growth Mechanism

Bao

Zhao

Luo

et al. 2016

Adv Materials Inter

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The experimental section of this manuscript contains an inappropriate first paragraph. The correct first paragraph of the experimental section is found below. CORRECTION 4. Experimental Section Preparation of HMNTAs: The MNT array on Si substrate is prepared using the method reported previously [31] and used as substrate without further treatment. In a typical experimental procedure, a MNT substrate is placed into Tefl on-lined stainless steel autoclave with a capacity of 100 mL. 2.5 × 10 −3 KMnO 4 and 10 × 10 −3 m concentrated HCl were added to 45 mL deionized water to form the precursor solution. The solution was transferred into the autoclave and the autoclave was then sealed and hydrothermally treated at 140 °C for 12 h. After the autoclave was cooled down to room temperature naturally, the products were collected and washed by deionized water. After washing, the as-prepared 4-fold-symmetry HMNTA on Si substrate was dried in air overnight. The as-synthesized products can be easily exfoliated and collected for further use. The 2-fold-symmetry HMNTAs are obtained by the same procedures but increasing the amount of KMnO 4 from 2.5 × 10 −3 to 3.33 × 10 −3 m.

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Section: Synthesis and Characterization Of The Hmntassupporting

confidence: 84%

Hierarchical α‐MnO₂ Tube‐on‐Tube Arrays with Superior, Structure‐Dependent Pseudocapacitor Performance Synthesized via a Selective Dissolution and Coherent Growth Mechanism

Bao

Zhao

Luo

et al. 2016

Adv Materials Inter

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“…[19][20][21][22][23][24][25][26] These have been taken into account when performing the XPS analysis; the results of some are summarized in Table I. [19][20][21][22][23][24][25][26] These have been taken into account when performing the XPS analysis; the results of some are summarized in Table I.…”

Section: Resultsmentioning

confidence: 99%

Surface Structure of LiMn[sub 2]O[sub 4] Electrodes

Eriksson

Gustafsson

Thomas

2002

Electrochem. Solid-State Lett.

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“…2i and 2j show the deconvoluted O1s core level peaks. The peak consists of three components at 529.6 eV assigned to Mn-O bonds, 23 at 531.4 eV assigned to C=O(H), Mn-OH bonds and at 533.8 eV assigned to adsorbed H 2 O. Table II shows the % concentration of the above components.…”

Section: Resultsmentioning

confidence: 99%

High-Voltage LiNi_0.5Mn_1.5O_4-_δSpinel Material Synthesized by Microwave-Assisted Thermo-Polymerization: Some Insights into the Microwave-Enhancing Physico-Chemistry

Kebede

Yannopoulos

Sygellou

et al. 2017

J. Electrochem. Soc.

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Oxygen-deficient pristine (LMNO) and microwave-treated LiMn 1.5 Ni 0.5 O 4-δ (LMNOmic) cathode materials have been synthesized with modified thermo-polymerization synthesis technique. The XRD, XPS, CV and charge/discharge voltage profile analysis confirm that the microwave treatment enhance the electrochemical property by adjusting the lattice parameter, nickel content, and Mn 3+ content. The galvanostatic charge/discharge testing results show that LMNOmic exhibits high capacity of 133 mAh g −1 at a 0.1 C and a high retention of 95%, the LMNOmic delivered high capacity for various current rates 0.1, 0.5, 1, 2 C compared to non-microwave LMNO sample. Electrochemical impedance spectroscopy shows a gradual increase in impedance during continuous cycling, indicating a gradual formation of the cathode-electrolyte interphase (CEI) film at the active LMNO surface. The rise in impedance at the end of the 100 th cycle is about three times higher for the LMNOmic than the pristine LMNO. This work proves the urgent need for further work, specifically focusing on material design and coating and/or doping strategies that will complement microwave irradiation and ultimately permit the stabilization of the cathode-electrolyte interface upon long-term cycling. The success of such work will allow the full realization of the advantageous properties of the microwave-treatment of the LMNO and related cathode materials. LiMn 1.5 Ni 0.5 O 4-δ (LMNO) continues to attract attention and remains as one of the most promising candidates as cathode materials for rechargeable lithium-ion batteries due to its ability to provide a high operating voltage (∼4.7 V) and 3-D channels for diffusion of lithium ions in its spinel structure. [1][2][3][4][5][6][7][8][9][10][11] The advantageous properties of the LMNO such as high energy and high power density makes its suitable for heavy duty and electric vehicle applications. There is a strong demand for positive electrode materials with higher energy density Ws to realize more practical electric vehicles (EVs) and energy storage systems (ESSs). The two options to get high energy density electrode materials are either to increase the voltage (E av ) or the rechargeable capacity (Q rech ) as the energy density Ws defined as W s = ∫ Q rech d Q X E av . Moreover, the use of the high manganese (Mn) content in the cathode provides for a safer and less expensive cathode while the nickel (Ni) provides for a high voltage redox reaction of E av = 4.5 V vs Li + /Li and Q rech = 135 mAh g −1 , providing energy density of more than 600 mWh g −1 . LiMn 1.5 Ni 0.5 O 4 exists in two crystal structure forms known as ordered and disordered. The synthesis procedure of LiMn 1.5 Ni 0.5 O 4 is so crucial which determines to obtain either cation disordered face-centered cubic spinel with the space group Fd3m or its ordered variant where cation ordering on the octahedral sites lowers crystal symmetry to cubic primitive (space group P4 3 32). 6 In the disordered structure, Mn and Ni ions are more or less randomly distributed i...

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MnO2 by XPS

Cited by 118 publications

References 5 publications

Hierarchical α‐MnO₂ Tube‐on‐Tube Arrays with Superior, Structure‐Dependent Pseudocapacitor Performance Synthesized via a Selective Dissolution and Coherent Growth Mechanism

Hierarchical α‐MnO₂ Tube‐on‐Tube Arrays with Superior, Structure‐Dependent Pseudocapacitor Performance Synthesized via a Selective Dissolution and Coherent Growth Mechanism

Surface Structure of LiMn[sub 2]O[sub 4] Electrodes

High-Voltage LiNi_0.5Mn_1.5O_4-_δSpinel Material Synthesized by Microwave-Assisted Thermo-Polymerization: Some Insights into the Microwave-Enhancing Physico-Chemistry

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MnO2 by XPS

Cited by 118 publications

References 5 publications

Hierarchical α‐MnO2 Tube‐on‐Tube Arrays with Superior, Structure‐Dependent Pseudocapacitor Performance Synthesized via a Selective Dissolution and Coherent Growth Mechanism

Hierarchical α‐MnO2 Tube‐on‐Tube Arrays with Superior, Structure‐Dependent Pseudocapacitor Performance Synthesized via a Selective Dissolution and Coherent Growth Mechanism

Surface Structure of LiMn[sub 2]O[sub 4] Electrodes

High-Voltage LiNi0.5Mn1.5O4-δSpinel Material Synthesized by Microwave-Assisted Thermo-Polymerization: Some Insights into the Microwave-Enhancing Physico-Chemistry

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Hierarchical α‐MnO₂ Tube‐on‐Tube Arrays with Superior, Structure‐Dependent Pseudocapacitor Performance Synthesized via a Selective Dissolution and Coherent Growth Mechanism

Hierarchical α‐MnO₂ Tube‐on‐Tube Arrays with Superior, Structure‐Dependent Pseudocapacitor Performance Synthesized via a Selective Dissolution and Coherent Growth Mechanism

High-Voltage LiNi_0.5Mn_1.5O_4-_δSpinel Material Synthesized by Microwave-Assisted Thermo-Polymerization: Some Insights into the Microwave-Enhancing Physico-Chemistry