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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.
Electrodeposition can...
747
Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Voltaic/Galvanic Cells02:47

Voltaic/Galvanic Cells

58.7K
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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Related Experiment Video

Updated: Sep 27, 2025

Simultaneous Multi-surface Anodizations and Stair-like Reverse Biases Detachment of Anodic Aluminum Oxides in Sulfuric and Oxalic Acid Electrolyte
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A solid-state electrolysis process for upcycling aluminium scrap.

Xin Lu1, Zhengyang Zhang2, Takehito Hiraki1

  • 1Graduate School of Engineering, Tohoku University, Sendai, Japan.

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|April 13, 2022
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Summary

A new solid-state electrolysis (SSE) process upcycles aluminium scrap into high-purity metal, comparable to primary aluminium. This energy-efficient recycling method meets rising demand for high-grade aluminium.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Metallurgy

Background:

  • Current aluminium scrap recycling via remelting downgrades quality, limiting its use to casting alloys.
  • Increasing demand for high-grade aluminium in electric vehicles will decrease demand for low-grade recycled aluminium used in internal combustion engines.

Purpose of the Study:

  • To develop a novel method for upcycling aluminium scrap to meet future high-grade aluminium demand.
  • To introduce a solid-state electrolysis (SSE) process for upgrading recycled aluminium.

Main Methods:

  • Proposed a solid-state electrolysis (SSE) process utilizing molten salts for aluminium scrap upcycling.
  • Demonstrated the SSE process's capability to produce high-purity aluminium from casting alloys.

Main Results:

  • The SSE process yields aluminium with purity comparable to primary aluminium.
  • Industrial-scale SSE is estimated to consume less than half the energy of primary aluminium production.
  • Effective recycling of aluminium scrap can consistently meet high-grade aluminium demand.

Conclusions:

  • The SSE process offers an efficient, low-energy solution for upcycling aluminium scrap.
  • This technology enables true sustainability in the aluminium lifecycle.
  • Meeting future high-grade aluminium demand is achievable through advanced recycling.