Zn5(OH)8Cl2·H2O sheets formed using cellulose as matrix via microwave-assisted method and its transformation to ZnO

Fu, Lian‐Hua; Yao, Dong; Li, Shu-Ming; Sun, Shaolong; Sun, Run‐Cang

doi:10.1016/j.matlet.2012.10.103

“…For ZBC-0.2, ZBC-1, and ZBC-4, the appearance of Zn 5 (OH) 8 Cl 2 .H 2 O or simonkolleite compound (JCPDS 07-0155) was observed instead of the characteristic peaks of ZnO nanoparticles. This finding indicated that the lower or higher content of molten ZnCl 2 prevented the formation of ZnO nanoparticles and subsequently formed simonkolleite layered-platelet structures …”

Section: Resultsmentioning

confidence: 90%

“…This finding indicated that the lower or higher content of molten ZnCl 2 prevented the formation of ZnO nanoparticles 36 and subsequently formed simonkolleite layered-platelet structures. 37 …”

Section: Resultsmentioning

confidence: 99%

Facile One-Step Pyrolysis of ZnO/Biochar Nanocomposite for Highly Efficient Removal of Methylene Blue Dye from Aqueous Solution

Luyen

¹

,

Nguyen

²

,

Dang

³

et al. 2023

ACS Omega

6

0

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In this work, we developed a facile one-step pyrolysis method for preparing porous ZnO/biochar nanocomposites (ZBCs) with a large surface area to enhance the removal efficiency of dye from aqueous solution. Peanut shells were pyrolyzed under oxygen-limited conditions with a molten salt ZnCl 2 , which played the roles of the activating agent and precursor for the formation of nanoparticles. The effects of the mass ratio between the molten salt ZnCl 2 and peanut shells as well as pyrolysis temperature on the formation of ZBCs were investigated. Characterization results revealed that the as-synthesized ZBCs exhibited a highly porous structure with a specific surface area of 832.12 m 2 /g, suggesting a good adsorbent for efficient removal of methylene blue (MB). The maximum adsorption capacity of ZBCs on MB was 826.44 mg/g, which surpassed recently reported adsorbents. The formation mechanism of ZnO nanoparticles on the biochar surface was due to ZnCl 2 vaporization and reaction with water molecules extracted from the lignocellulosic structures. This study provides a basis for developing a simple and large-scale synthesis method for wastewater with a high adsorption capacity.

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I₃⁻/I⁻ Redox Reaction‐mediated Organic Zinc‐Air Batteries with Accelerated Kinetics and Long Shelf Lives

Cui

¹

,

Ma

²

,

Lei

³

et al. 2023

Angewandte Chemie

0

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The storage time of Zn‐air batteries (ZABs) for practical implementation have been neglected long‐lastingly. ZABs based on organic solvents promise long shelf lives but suffer from sluggish kinetics. Here, we report a longly storable ZAB with accelerated kinetics mediated by I3−/I− redox. In the charge process, the electrooxidation of Zn5(OH)8Cl2⋅H2O is accelerated by I3− chemical oxidation. In the discharge process, I− adsorbed on the electrocatalyst changes the energy level of oxygen reduction reaction (ORR). Benefitting from these advantages, the prepared ZAB shows remarkably improved round‐trip efficiency (56.03 % vs. 30.97 % without the mediator), and long‐term cycling time (>2600 h) in ambient air without replacing any components or applying any protective treatment to Zn anode and electrocatalyst. After resting for 30 days without any protection, it can still directly discharge continuously for 32.5 h and charge/discharge very stably for 2200 h (440 cycles), which is evidently superior to aqueous ZABs (only 0/0.25 h, and 50/25 h (10/5 cycles) by mild/alkaline electrolyte replenishment). This study provides a strategy to solve both storage and sluggish kinetics issues that have been plaguing ZABs for centuries, opening up a new avenue to the industrial application of ZABs.

show abstract

I₃⁻/I⁻ Redox Reaction‐mediated Organic Zinc‐Air Batteries with Accelerated Kinetics and Long Shelf Lives

Cui

¹

,

Ma

²

,

Lei

³

et al. 2023

View full text Add to dashboard Cite

The storage time of Zn‐air batteries (ZABs) for practical implementation have been neglected long‐lastingly. ZABs based on organic solvents promise long shelf lives but suffer from sluggish kinetics. Here, we report a longly storable ZAB with accelerated kinetics mediated by I3−/I− redox. In the charge process, the electrooxidation of Zn5(OH)8Cl2⋅H2O is accelerated by I3− chemical oxidation. In the discharge process, I− adsorbed on the electrocatalyst changes the energy level of oxygen reduction reaction (ORR). Benefitting from these advantages, the prepared ZAB shows remarkably improved round‐trip efficiency (56.03 % vs. 30.97 % without the mediator), and long‐term cycling time (>2600 h) in ambient air without replacing any components or applying any protective treatment to Zn anode and electrocatalyst. After resting for 30 days without any protection, it can still directly discharge continuously for 32.5 h and charge/discharge very stably for 2200 h (440 cycles), which is evidently superior to aqueous ZABs (only 0/0.25 h, and 50/25 h (10/5 cycles) by mild/alkaline electrolyte replenishment). This study provides a strategy to solve both storage and sluggish kinetics issues that have been plaguing ZABs for centuries, opening up a new avenue to the industrial application of ZABs.

show abstract

Zn5(OH)8Cl2·H2O sheets formed using cellulose as matrix via microwave-assisted method and its transformation to ZnO

Cited by 18 publications

References 19 publications

Facile One-Step Pyrolysis of ZnO/Biochar Nanocomposite for Highly Efficient Removal of Methylene Blue Dye from Aqueous Solution

Facile One-Step Pyrolysis of ZnO/Biochar Nanocomposite for Highly Efficient Removal of Methylene Blue Dye from Aqueous Solution

I₃⁻/I⁻ Redox Reaction‐mediated Organic Zinc‐Air Batteries with Accelerated Kinetics and Long Shelf Lives

I₃⁻/I⁻ Redox Reaction‐mediated Organic Zinc‐Air Batteries with Accelerated Kinetics and Long Shelf Lives

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Zn5(OH)8Cl2·H2O sheets formed using cellulose as matrix via microwave-assisted method and its transformation to ZnO

Cited by 18 publications

References 19 publications

Facile One-Step Pyrolysis of ZnO/Biochar Nanocomposite for Highly Efficient Removal of Methylene Blue Dye from Aqueous Solution

Facile One-Step Pyrolysis of ZnO/Biochar Nanocomposite for Highly Efficient Removal of Methylene Blue Dye from Aqueous Solution

I3−/I− Redox Reaction‐mediated Organic Zinc‐Air Batteries with Accelerated Kinetics and Long Shelf Lives

I3−/I− Redox Reaction‐mediated Organic Zinc‐Air Batteries with Accelerated Kinetics and Long Shelf Lives

Contact Info

Product

Resources

About

I₃⁻/I⁻ Redox Reaction‐mediated Organic Zinc‐Air Batteries with Accelerated Kinetics and Long Shelf Lives

I₃⁻/I⁻ Redox Reaction‐mediated Organic Zinc‐Air Batteries with Accelerated Kinetics and Long Shelf Lives