Thermal decomposition of zinc hydroxy-sulfate-hydrate minerals

Staminirova, Tsveta; Petrova, Nadia; Kirov, Georgi

doi:10.1007/s10973-016-5325-x

Cited by 27 publications

(16 citation statements)

References 22 publications

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“…[54] For the KMO after cycling at 1.2 V (Figure S11b, Supporting Information), weight loss peaks at 157, 267, and 397 °C are observed, in agreement with the different decomposition steps of ZHS into ZnO. [55] Those results and the proposed mechanism are in good agreement with the work from Pan et al [37] Moreover, results of the EQCM/in-operando XRD study provide the first direct evidence of the generation of ZHS during cycling, assumed to originated from the local pH increase as the consequence of proton intercalation.…”

Section: Charge Storage Mechanismsupporting

confidence: 66%

Alkali Ions Pre‐Intercalated Layered MnO₂ Nanosheet for Zinc‐Ions Storage

Liu

Huang

et al. 2021

Advanced Energy Materials

166

116

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Compared with organic electrolytes, aqueous electrolytes are safer (no risk of burning) and can achieve an ionic conductivity several orders of magnitude higher than organic electrolytes. [1][2][3][4] This makes aqueous rechargeable batteries cheap, nonpolluting and safe, with potentially high power density capability (although the cell voltage is limited). [1] However, the widely studied aqueous lithium-ion batteries and sodium-ion batteries have low specific capacities (<150 mAh g −1 ). [2] Among potential alternatives, the aqueous Zn-ion battery (AZIB) is currently attracting significant attention due to key features of Zn metal, including abundance (low cost) and high theoretical specific capacity (820 mAh g −1 ). [5][6][7][8][9] The main challenges for the development of aqueous Zn-ion batteries are to achieve dendrite-free Zn deposit at the anode [10,11] and find suitable cathode materials. MnO 2 (theoretical capacity is 308 mAh g −1 ) is one of the most attractive cathode materials for aqueous zinc ion batteries due to their high energy density and high power density. [5,6,8,[11][12][13][14][15] Among various crystallographic polymorphs (α-, β-, γ-, δ-, λ-, and εtype), birnessite-type δ-MnO 2 with layered structure owns a large interlayer spacing (≈0.7 nm), which is more suitable for rapid and reversible (de-)insertion of Zn ions. [16] However, δ-MnO 2 was reported to show poor rate capability and cycling stability. [15] According to the literature, δ-MnO 2 -based cathodes are limited by the serious structural degradation with phase transformation, which is mainly attributed to the cointercalation of water molecules and dissolution of Mn during cycling processes. [17,18] It has been reported that the preintercalation of large cations (such as, K + , Ce 3+ , and Ca 2+ ) in MnO 2 during synthetic process can stabilize the structure through coordination of guest-ions with adjacent host atoms. [16,[19][20][21][22][23][24][25] Moreover, the preintercalation of alkaline ion strategy in MnO 2 has also attracted much attention as an effective approach to enhance the electronic conductivity, activating more active sites, and promoting diffusion kinetics. [25] To date, various types of reaction mechanisms have been reported for Mn oxide-based positive electrode of Zn-MnO 2 battery in Zn-containing aqueous electrolyte. [15,[26][27][28] Pan et al. [26] proposed a chemical-assisted conversion reaction mechanism Recently, rechargeable zinc-ion batteries in mild acidic electrolytes have attracted considerable research interest as a result of their high sustainability, safety, and low cost. However, the use of conventional Zn-ion storage materials is hindered by insufficient specific capacity, sluggish reaction kinetics, or poor cycle life. Here, these limitations are addressed by preintercalating alkali ions and water crystals into layered δ-MnO 2 (birnessite) to prepare K 0.27 MnO 2 •0.54H 2 O (KMO) and Na 0.55 Mn 2 O 4 •1.5H 2 O with ultrathin nanosheet morphology via a rapid molten salt method. In these materials, alk...

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Section: Charge Storage Mechanismsupporting

confidence: 66%

Alkali Ions Pre‐Intercalated Layered MnO₂ Nanosheet for Zinc‐Ions Storage

Liu

Huang

et al. 2021

Advanced Energy Materials

166

116

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“…MS analysis data show the presence of SO 2 and O 2 as evolving gases. The effect 7 points the decomposition of Cu 2 O(SO 4 ) (Koga et al, 2008) followed by the decomposition of Zn 3 O(SO 4 ) 2 (endo-effect 8) (Straszko et al, 1997;Stanimirova et al, 2016). Tenorite (CuO) and zincite (ZnO) are obtained as final products of the thermal decomposition.…”

Section: Resultsmentioning

confidence: 99%

“…It is known that the thermal decomposition of copper hydroxide sulfates and zinc hydroxide sulfates leads to the formation of CuO (Koga et al, 2008) and ZnO (Moezzi et al, 2013;Liang et al, 2015), respectively as final products with various desired properties and applications. In contrast to the detailed characteristics of the thermal decomposition of various Zn-hydroxy-salt minerals with the final product ZnO (Stanimirova et al, 2016), the ther-mal behavior of Cu-hydroxy-salt minerals has been poorly studied.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of ktenasite

Delcheva¹,

Petrova²,

Stanimirova³

2020

Rev. Bulg. Geol. Soc.

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The aim of this paper is to report preliminary data concerning the thermal behavior of the ktenasite based on analysis of decomposition processes and obtained products using combined thermal and XRD methods. The ktenasite was prepared by a chemical reaction between 1 g of ZnO powder and 10 ml 1M solution of CuSO4 with periodical steering at room tem¬perature for 7 days. The obtained suspension was filtered, washed with distilled water, and dried at room temperature. The thermal decomposition process of the ktenasite including different processes such as dehydration, dehydroxylation and evolving of SO2 and O2 is rather complicated due to the simultaneous presence of both copper and zinc in the system and this suggests further investigations to clarify the reaction mechanism of the process.

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“…Figure 4b shows the FTIR spectra for pure Zn as well as for the anodized and annealed sample. The absorption band at around 430 cm −1 is associated with the vibration of Zn-O in ZnO [25]. Bands at around 600 and 1050 cm −1 can be assigned to the bending modes and vibration of SO 4…”

Section: Xrd Ftir and Xps Measurementsmentioning

confidence: 98%

Anodic ZnO Microsheet Coating on Zn with Sub-Surface Microtrenched Zn Layer Reduces Risk of Localized Corrosion and Improves Bioactivity of Pure Zn

Dong

Virtanen

2021

Coatings

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Zinc-based alloys are emerging as an alternative to magnesium- and iron-based alloys for biodegradable implant applications, due to their appropriate corrosion performance and biocompatibility. However, localized corrosion occurring on the zinc surface, which is generally associated with restricted mass transport at specific surface sites, such as in confined crevices, declines mechanical strength and can lead to the failure of implant materials. In order to improve corrosion behavior and bioactivity, we explore the effect of a ZnO microsheet coating fabricated on pure Zn via anodic oxidization. Samples were characterized with Scanning Electron Microscope (SEM) (including Energy Dispersive Spectroscopy (EDS), X-ray Photoelectron spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR), and X-ray Diffraction (XRD)). The microstructured surface consists of parallel Zn trenches on the bottom and ZnO/Zn3O(SO4)2 sheets on the top. This layer shows favorable Ca-phosphate precipitation as well as bovine serum albumin (BSA) adsorption properties. Electrochemical experiments indicate an increased corrosion resistance of surface-modified Zn by the presence of BSA in simulated body fluid. Most noteworthily, localized corrosion that has been previously observed for pure Zn in BSA-containing electrolytes does not occur on the Zn/ZnO-coated surface.

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Thermal decomposition of zinc hydroxy-sulfate-hydrate minerals

Cited by 27 publications

References 22 publications

Alkali Ions Pre‐Intercalated Layered MnO₂ Nanosheet for Zinc‐Ions Storage

Alkali Ions Pre‐Intercalated Layered MnO₂ Nanosheet for Zinc‐Ions Storage

Thermal decomposition of ktenasite

Anodic ZnO Microsheet Coating on Zn with Sub-Surface Microtrenched Zn Layer Reduces Risk of Localized Corrosion and Improves Bioactivity of Pure Zn

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Thermal decomposition of zinc hydroxy-sulfate-hydrate minerals

Cited by 27 publications

References 22 publications

Alkali Ions Pre‐Intercalated Layered MnO2 Nanosheet for Zinc‐Ions Storage

Alkali Ions Pre‐Intercalated Layered MnO2 Nanosheet for Zinc‐Ions Storage

Thermal decomposition of ktenasite

Anodic ZnO Microsheet Coating on Zn with Sub-Surface Microtrenched Zn Layer Reduces Risk of Localized Corrosion and Improves Bioactivity of Pure Zn

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Alkali Ions Pre‐Intercalated Layered MnO₂ Nanosheet for Zinc‐Ions Storage

Alkali Ions Pre‐Intercalated Layered MnO₂ Nanosheet for Zinc‐Ions Storage