Reconstruction and intercalating anion exchange of ZnAl-layered double hydroxide

Kang, Geon-Hyeong; Park, Il‐Kyu

doi:10.1016/j.ceramint.2021.10.078

Cited by 13 publications

(8 citation statements)

References 33 publications

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“…However, (003), (006), (015), and other characteristic peaks corresponding to Mg-Al LDO have disappeared, showing the characteristic peak of the metal oxide [ 47 ]. The characteristic peaks of hydrotalcite have reappeared in Mg-Al LDO Cl − , which is consistent with the reconstruction of the layered structure [ 59 ]. It is observed that the reflection of (003) has shifted to a higher 2θ angle and that the d-spacing has decreased from 0.793 nm for Mg-Al LDH to 0.786 nm for Mg-Al LDO Cl − (as shown in Table S2 ).…”

Section: Resultssupporting

confidence: 73%

The Performance and Mechanism of a Mg-Al Double-Layer Oxide in Chloride ion Removal from an Aqueous Solution

Yang

et al. 2022

Nanomaterials

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The increasing threat of chloride ions (Cl−) has led researchers to explore efficient removal technologies. Sewage treatment with a double-layer hydroxide/oxide (LDH/LDO) is receiving increasing attention. In this work, Mg-Al LDO adsorbents were produced by the calcination of the Mg-Al LDH precursor, which was constituted by improved coprecipitation. The influence of calcination temperature, calcination time, adsorbent dosage, Cl− initial concentration, contact time, and adsorption temperature on Cl− elimination was investigated systematically. The experimental results showed that a better porous structure endowed the Mg-Al LDO with outstanding adsorption properties for Cl−. The adsorption process was well matched to the pseudo-second-order kinetics model and the Freundlich model. Under optimal conditions, more than 97% of the Cl− could be eliminated. Moreover, the removal efficiency was greater than 90% even after 11 adsorption–desorption cycles. It was found that the electrostatic interaction between Cl− and the positively charged Mg-Al LDO laminate, coupled with the reconstruction of the layer structure, was what dominated the Cl− removal process.

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Section: Resultssupporting

confidence: 73%

The Performance and Mechanism of a Mg-Al Double-Layer Oxide in Chloride ion Removal from an Aqueous Solution

Yang

et al. 2022

Nanomaterials

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“…A peak at 1085 cm −1 in Fe/Co LDH corresponds to the symmetric stretching of the carbonate anion (CO 3 2− ) present between the lattice of two metallic hydroxides and a peak at 1355 cm −1 resembles the vibration present on the external surface of the LDH. 43 Further, the peaks lower to 760 cm −1 are a result of the stretching modes (E 1g , A 1g ) in the metal−metal and metal−ligand vibration. Specifically, the peaks observed at 468 and 672 cm −1 correspond to the Co metal, further guaranteeing the presence of nanoparticles of cobalt.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…Among all composites, CoL 2:1 revealed the highest degree of disorder ( I D / I G = 1.05) and is anticipated to possess the maximum electrocatalytic activity since carbon defects tend to soar up the OER and ORR activity. A peak at 1085 cm –1 in Fe/Co LDH corresponds to the symmetric stretching of the carbonate anion (CO 3 2– ) present between the lattice of two metallic hydroxides and a peak at 1355 cm –1 resembles the vibration present on the external surface of the LDH . Further, the peaks lower to 760 cm –1 are a result of the stretching modes (E 1g , A 1g ) in the metal–metal and metal–ligand vibration.…”

Section: Resultsmentioning

confidence: 99%

In-Situ Nanoarchitectonics of Fe/Co LDH over Cobalt-Enriched N-Doped Carbon Cookies as Facile Oxygen Redox Electrocatalysts for High-Rate Rechargeable Zinc–Air Batteries

Allwyn,

Gokulnath,

Sathish

2024

ACS Appl. Mater. Interfaces

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The reality of long-term rechargeable and high-performance zinc−air batteries relies majorly on cost-effective and eminent bifunctional electrocatalysts, which can perform both the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER). Herein, we demonstrate a new approach for the synthesis of in-situ-grown layered double hydroxide of iron and cobalt over a cobalt nanoparticle-enriched nitrogen-doped carbon frame (CoL 2:1) by a simple coprecipitation reaction with facile scale-up and explore its electrocatalytic ORR and OER activity for an electrically rechargeable zinc−air battery. Consequently, the developed composite displays excellent ORR and OER activity with an ORR half-wave potential of 0.84 V, a limiting current density of 5.85 mA/cm 2 , and an OER overpotential of 320 mV with exceptional stability. The outstanding bifunctionality index of the catalyst (ΔE = 0.72 V) inspired us to utilize it as a cathode catalyst in an in-house developed prototype zinc−air battery. The battery could easily supply a specific capacity of 804 mAh/g with a maximum peak power density of 161 mW/cm 2 . The battery exhibits an attractive charge−discharge profile with a lesser voltage gap of 0.76 V at 10 mA/cm 2 with durability for a period of 200 h and a voltage efficiency of 97%, which surpassed the corresponding Pt/C + RuO 2 -based zinc−air battery. Further, a maximum load of 50 mA/cm 2 could easily be sustained during cycling, revealing its outstanding stability. A series-connected two CoL 2:1-based zinc−air batteries effortlessly enlighten a pinwheel fan and LED panel simultaneously, revealing its practicality. The high electrical conductivity and greater specific surface area of Co/N−C and its robust attachment with Fe/Co LDH preserves both active sites, thereby resulting in exceptional performance. Our method is capable of being flexible enough to create various bifunctional Co/N− C-based composite electrodes, opening up a feasible pathway to rechargeable zinc−air batteries with maximum energy density.

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“…At present, many different preparation methods of LDH have been reported, such as in situ growth, [28,[40][41][42] co-deposition [34,43], and anion exchange methods. [44] LDH prepared by the in situ growth method has attracted a lot of attention from researchers due to its simple preparation process, strong coating adhesion, and remarkable corrosion resistance. [28,[40][41][42]45] LDH film has been successfully prepared on Zn-Al alloys to improve the corrosion resistance of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of ZnAl‐LDH on corrosion resistance of Zn–55Al alloy in NaCl solution

Yang

Wang

Huang

et al. 2023

Materials & Corrosion

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ZnAl layered double hydroxides (Zn6Al2(OH)16CO3, LDH) are the unique phase in the corrosion products of Zn–Al coating compared with the corrosion products of pure Zn coating. The effect of LDH on the corrosion resistance of Zn–55Al coating is investigated in this work. The LDH preferentially grows on the Zn‐rich region of Zn–55Al alloy, and then gradually grows on the Al‐rich region. The prepared LDH film can effectively inhibit the formation of simonkolleite (Zn5(OH)8Cl2, ZHC), hydrozincite (Zn5(CO3)2(OH)6, HZ), and ZnO in the corrosion product film of Zn–55Al alloy, making the corrosion product film more dense and less prone to cracking, which can effectively prevent the corrosion of Zn–55Al alloy. The LDH film can effectively reduce the corrosion current density and improve the electrochemical impedance of pure Zn. In the end, the corrosion protection mechanism of LDH on the surface of Zn–55Al alloy was discussed.

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Reconstruction and intercalating anion exchange of ZnAl-layered double hydroxide

Cited by 13 publications

References 33 publications

The Performance and Mechanism of a Mg-Al Double-Layer Oxide in Chloride ion Removal from an Aqueous Solution

The Performance and Mechanism of a Mg-Al Double-Layer Oxide in Chloride ion Removal from an Aqueous Solution

In-Situ Nanoarchitectonics of Fe/Co LDH over Cobalt-Enriched N-Doped Carbon Cookies as Facile Oxygen Redox Electrocatalysts for High-Rate Rechargeable Zinc–Air Batteries

Effect of ZnAl‐LDH on corrosion resistance of Zn–55Al alloy in NaCl solution

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