Influence of starch used in the sol-gel synthesis of ZnO nanopowders

Almeida, Willians Lopes de; Freisleben, Lucas C.; Brambilla, Brenda Camargo; Isoppo, Victória Goulart; Rodembusch, Fabiano Severo; Sousa, Vânia Caldas de

doi:10.1007/s11051-023-05730-5

Cited by 2 publications

(2 citation statements)

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“…Another characteristic that can be determined from the powder X-ray diffraction pattern is the size of the crystallite of the manganese oxides. By calculating the broadening of the Bragg reflection for the characteristic peak (highest intensity peak) of the mineral phase with the application of the Debye-Scherrer equation (Equation (1)), it is possible to determine the crystallite size D (Table 3) [40,41]. These calculations show that the samples of nsutite have very small crystallite sizes that can help elevate their electrochemical properties.…”

Section: Micro-twinning (Tw)mentioning

confidence: 99%

“…This occurrence is likely due to the presence of manganese oxides (todorokite and nsutite) in conjunction with calcite (CaCO 3 ) and quartz (SiO 2 ) in the specific sample, which may act as catalysts in the development of manganese silicates, meaning the samples of manganese oxides that contain matrix calcite and quartz need to be separated first and then undergo heat treatment in order to transform into hausmannite successfully. the Bragg reflection for the characteristic peak (highest intensity peak) of the mineral phase with the application of the Debye-Scherrer equation (Equation (1)), it is possible to determine the crystallite size D (Table 3) [40,41]. These calculations show that the samples of nsutite have very small crystallite sizes that can help elevate their electrochemical properties.…”

Section: Micro-twinning (Tw)mentioning

confidence: 99%

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Electrochemical Behavior of Natural Manganese Oxides: Transforming Mining Waste into Energy Storage Materials

Soulamidis,

Kourmousi,

Mitsopoulou

et al. 2024

Minerals

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The present research explores the potential of manganese oxide waste ore in energy storage applications, focusing on supercapacitors. The investigation assesses the electrochemical capabilities of natural manganese oxides obtained from the Drama region, which has been the main mining center of Greece for manganese ore, especially that of battery-grade quality. Samples were collected from abandoned mining sites in the Kato Nevrokopi area, Drama. The structure and composition of the manganese minerals were determined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Electrochemical tests involved the preparation of electrodes using natural nsutite and heat-treated nsutite (hausmannite). Then, the designed electrodes were subjected to cyclic voltammetry tests and charge–discharge measurements. The hausmannite electrode exhibited a higher specific capacitance of 667 F/g at a current density of 0.2 A/g, and the electrode material retained 98.3% of its initial capacitance after 1000 cycles. This study provides new perspectives on simple and efficient methods for transforming natural nsutite material from mining waste to hausmannite with greater structural homogeneity and better electrochemical behavior.

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Section: Micro-twinning (Tw)mentioning

confidence: 99%

Section: Micro-twinning (Tw)mentioning

confidence: 99%