Sol–gel electrospun mesoporous ZnMn2O4 nanofibers with superior specific surface area

Shamitha, C.; Senthil, T.; Wu, Lixin; Kumar, B. Sachin; Anandhan, S.

doi:10.1007/s10854-017-7479-0

Cited by 24 publications

(8 citation statements)

References 44 publications

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“…The Raman spectrum of EDM grown from the solution containing 4 mM MnSO 4 and 0.1 M ZnSO 4 (Figure 8, blue plot) is different from that of EDM electrodeposited in the absence of Zn 2+ . The bands at ≈318, 370, and 668 cm −1 are compatible with tetragonal spinel ZnMn 2 O 4 [ 62–67 ] and those at ≈ 500, 574, and 658 cm −1 with δ‐MnO 2 . [ 68 ] Spectral assignment on the basis of the literature cannot be definitive, and a rigorous structural analysis is beyond the scope of this paper, but the profoundly modified pattern witnesses a strong effect of Zn 2+ on the electrocrystallization of EDM.…”

Section: Resultsmentioning

confidence: 99%

What Happens to MnO₂ When It Comes in Contact with Zn²⁺? An Electrochemical Study in Aid of Zn/MnO₂‐Based Rechargeable Batteries

et al. 2022

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In the science and technology of electrochemical energy storage, different allotropes of MnO2, fabricated with a variety of methods, are assembled into electrodes, playing the role of cathode or oxygen reduction reaction (ORR) electrocatalyst. Often, MnO2‐based cathodes are combined with Zn anodes into different types of batteries, resulting in contact between MnO2 and its electrochemical reaction products, and Zn2+. Awareness is growing that this interaction adversely affects the functional performance of MnO2, but no definitive understanding has been reached for this issue. This study contributes, through electrochemical measurements accompanied by microscopy and Raman spectroscopy, to a better understanding of the way the electrochemical behavior of two technologically representative types of manganese dioxide ‐ hydrothermally grown α‐MnO2 and electrodeposited γ‐MnO2 (EDM) ‐ is degraded when these materials are exposed to neutral and alkaline aqueous solutions, containing Zn2+. Specifically, we highlighted different types of irreversible changes in electrochemical response, which can be interpreted with phase‐formation processes. Such changes result in the deactivation of α‐MnO2 as ORR electrocatalyst, and of both α‐MnO2 and EDM as zinc‐ion battery (ZIB) cathodes. The electroactivity of EDM for ZIB operation can be restored if Mn2+ is added to the neutral electrolyte, because a phase, active in discharge, is electrodeposited during charging.

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Section: Resultsmentioning

confidence: 99%

What Happens to MnO₂ When It Comes in Contact with Zn²⁺? An Electrochemical Study in Aid of Zn/MnO₂‐Based Rechargeable Batteries

et al. 2022

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“…According to the literature, a size effect in R(λ) spectra might be expected for the nanometric grains. [71,114,115] However, the ceramic grains' size varied randomly in the 1-20 μm range. Hence, I do not relate the R magnitude to porosity and grain morphology.…”

Section: Discussionmentioning

confidence: 99%

Visible–Near‐Infrared Diffuse Reflectance and Optical Energy Gap of Sodium Niobate Modified by Mn Ions: Na(Nb_1−zMn_z)O₃ and (Na_1−xBi_x)(Nb_1−yMn_y)O₃ Compounds Study

Molak

2022

Physica Status Solidi (b)

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The optical and electrical properties of sodium niobate crystals and ceramics doped with Mn atoms are studied. Na(Nb1−zMnz)O3 crystals exhibit actual z = 0–1.0 wt% Mn content. The Na(Nb1−zMnz)O3 ceramics contains Mn from the 0–5 wt% range. The (Na1−xBix)(Nb1−yMny)O3 ceramics is codoped with x = 0.015–0.50 and y = 0.01–0.33. Mn addition decreases the reflectance magnitude. Combined nonstoichiometry and local disorder in the crystal lattice, resulting from Mn doping and oxygen vacancies, induce contributions to the electronic structure. The visible and near‐infrared (Vis–NIR) diffuse reflectance, R(λ), spectra include a linear combination of contributions. The modified Kubelka–Munk function representation allows estimation of the optical energy gap, Egap. This estimation is qualitative because of the complex structure of the samples. Two optical gaps, showing dependence on Mn content, are discerned when Mn content <1 wt%. Egap,high changes toward the Shockley–Queisser limit, from 1.85 to 1.4 eV, when Mn content is low (z < 1 wt%). Simultaneous occurrence of Egap,low of 1.0–1.3 eV suggests tuning possibility. Egap of ≈1 eV dominates optical properties when Mn content is >1 wt%. The optical features are consistent with activation energy attributed to thermally generated electrical conductivity.

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“…ZnMn 2 O 4 has been widely used in Li-ion batteries, supercapacitors, sensors, and thermistors. Shamitha et al successfully fabricated ZnMn 2 O 4 nanofibers via the sol-gel assisted electrospinning method using poly(styrene- co -acrylonitrile) as a sacrificial polymeric binder, and the influence of calcination temperature on the synthesis of ZnMn 2 O 4 nanofibers was investigated [84]. Before heat treatment, the average diameter of the composite fiber precursors was about 281 nm.…”

Section: Synthesis Of 1d Structural Materials By the Sol-gel Methodsmentioning

confidence: 99%

Synthesis of Hollow Sphere and 1D Structural Materials by Sol-Gel Process

Zhang

2017

Materials

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The sol-gel method is a simple and facile wet chemical process for fabricating advanced materials with high homogeneity, high purity, and excellent chemical reactivity at a relatively low temperature. By adjusting the processing parameters, the sol-gel technique can be used to prepare hollow sphere and 1D structural materials that exhibit a wide application in the fields of catalyst, drug or gene carriers, photoactive, sensors and Li-ion batteries. This feature article reviewed the development of the preparation of hollow sphere and 1D structural materials using the sol-gel method. The effects of calcination temperature, soaking time, pH value, surfactant, etc., on the preparation of hollow sphere and 1D structural materials were summarized, and their formation mechanisms were generalized. Finally, possible future research directions of the sol-gel technique were outlined.

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Sol–gel electrospun mesoporous ZnMn2O4 nanofibers with superior specific surface area

Cited by 24 publications

References 44 publications

What Happens to MnO₂ When It Comes in Contact with Zn²⁺? An Electrochemical Study in Aid of Zn/MnO₂‐Based Rechargeable Batteries

What Happens to MnO₂ When It Comes in Contact with Zn²⁺? An Electrochemical Study in Aid of Zn/MnO₂‐Based Rechargeable Batteries

Visible–Near‐Infrared Diffuse Reflectance and Optical Energy Gap of Sodium Niobate Modified by Mn Ions: Na(Nb_1−zMn_z)O₃ and (Na_1−xBi_x)(Nb_1−yMn_y)O₃ Compounds Study

Synthesis of Hollow Sphere and 1D Structural Materials by Sol-Gel Process

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Sol–gel electrospun mesoporous ZnMn2O4 nanofibers with superior specific surface area

Cited by 24 publications

References 44 publications

What Happens to MnO2 When It Comes in Contact with Zn2+? An Electrochemical Study in Aid of Zn/MnO2‐Based Rechargeable Batteries

What Happens to MnO2 When It Comes in Contact with Zn2+? An Electrochemical Study in Aid of Zn/MnO2‐Based Rechargeable Batteries

Visible–Near‐Infrared Diffuse Reflectance and Optical Energy Gap of Sodium Niobate Modified by Mn Ions: Na(Nb1−zMnz)O3 and (Na1−xBix)(Nb1−yMny)O3 Compounds Study

Synthesis of Hollow Sphere and 1D Structural Materials by Sol-Gel Process

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What Happens to MnO₂ When It Comes in Contact with Zn²⁺? An Electrochemical Study in Aid of Zn/MnO₂‐Based Rechargeable Batteries

What Happens to MnO₂ When It Comes in Contact with Zn²⁺? An Electrochemical Study in Aid of Zn/MnO₂‐Based Rechargeable Batteries

Visible–Near‐Infrared Diffuse Reflectance and Optical Energy Gap of Sodium Niobate Modified by Mn Ions: Na(Nb_1−zMn_z)O₃ and (Na_1−xBi_x)(Nb_1−yMn_y)O₃ Compounds Study