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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

405
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...
405

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Selective Interface Engineering with Large π-Conjugated Molecules Enables Durable Zn Anodes.

Feng Zhang1, Qiangqiang Meng1, Jia-Wei Qian1

  • 1Division of Nanomaterials & Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, School of Chemistry and Materials Science, CAS Key Laboratory of Mechanical Behavior and Design of Materials (LMBD), School of Engineering Science, University of Science and Technology of China, Hefei, Anhui, 230026, PR China.

Angewandte Chemie (International Ed. in English)
|January 24, 2025
PubMed
Summary
This summary is machine-generated.

Grafting large molecules like bilirubin onto zinc surfaces prevents dendrite growth in aqueous zinc batteries. This enhances stability and performance, enabling longer battery life.

Keywords:
aqueous zinc-ion batteryd-band centerinterface engineeringlarge π-conjugated moleculespreferential absorption

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Computational Chemistry

Background:

  • Aqueous zinc ion batteries face challenges with dendrite growth and side reactions at the zinc/electrolyte interface.
  • These issues limit battery performance and lifespan.

Purpose of the Study:

  • To investigate the use of large π-conjugated molecules to modify the Zn/electrolyte interface.
  • To enhance the stability and performance of aqueous zinc ion batteries.

Main Methods:

  • Density functional theory (DFT) calculations were employed to study the adsorption of molecules on Zn surfaces.
  • Experimental validation involved fabricating and testing modified zinc anodes and full cells.

Main Results:

  • Grafting molecules like bilirubin (BR) onto Zn surfaces promotes preferential adsorption on non-(002) facets.
  • This leads to interfacial charge redistribution, an upshifted Zn d-band center, and improved H+ fixation.
  • BR-modified anodes demonstrated excellent Coulombic efficiency (99.86% over 4000 cycles) and prolonged lifespan (over 1600 hours at 10 mA cm⁻²).
  • Full cells using BR-modified anodes showed high capacity retention (e.g., 86.1% after 1400 cycles).

Conclusions:

  • Grafting large π-conjugated molecules selectively exposes Zn(002) facets, regulates the electrical double layer (EDL), and upshifts the Zn d-band center.
  • This strategy offers a promising pathway for developing durable and high-performance aqueous zinc anodes.