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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
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Voltaic/Galvanic Cells02:47

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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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Qualitative Analysis

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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
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Gradient Structured Separator Enables Stable Aqueous Zinc Metal Batteries.

Zehua Zhao, Yan Zhang, Huandi Zhang

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    A novel functional separator using cerium fluoride (CeF3) nanoparticles on glass fibers enhances aqueous zinc-ion battery performance. This separator suppresses dendrite growth and side reactions, enabling stable cycling for over 2500 hours.

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    Area of Science:

    • Materials Science
    • Electrochemistry
    • Energy Storage

    Background:

    • Developing stable aqueous zinc-ion batteries is crucial for sustainable energy storage.
    • Zinc dendrite growth and parasitic side reactions hinder battery performance and lifespan.
    • Functional separators are key to improving electrochemical performance by controlling ion transport and preventing undesirable reactions.

    Purpose of the Study:

    • To design and fabricate a functional separator with a gradient structure for aqueous zinc-ion batteries.
    • To investigate the separator's ability to suppress zinc dendrite growth and parasitic side reactions.
    • To enhance the electrochemical performance and cycling stability of zinc anodes.

    Main Methods:

    • Fabrication of a functional separator using cerium fluoride (CeF3) nanoparticles functionalized glass fibers.
    • Experimental characterization of the separator's structure and properties.
    • Electrochemical testing of Zn||Zn cells with the functional separator, including long-term cycling stability tests.
    • Theoretical calculations to understand ion transport mechanisms.

    Main Results:

    • The functional separator exhibits a gradient structure that effectively tailors Zn2+ flux and restrains SO42- transport.
    • The CeF3 nanoparticles promote dense zinc deposition and suppress side reactions through interaction with water molecules.
    • The modified Zn||Zn cells demonstrated excellent cycling stability, achieving 2500 hours at 1 mA cm-2 and 1 mAh cm-2, and 1000 hours at 5 mA cm-2 and 5 mAh cm-2.

    Conclusions:

    • The developed CeF3-functionalized gradient separator is a promising strategy for advancing aqueous zinc-ion battery technology.
    • This separator design effectively addresses key challenges like dendrite formation and side reactions.
    • The findings offer a new solution for developing high-performance and long-lasting aqueous zinc-ion batteries.