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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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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Interfacial double-coordination effect reconstructing anode/electrolyte interface for long-term and highly reversible

Jie Zhou1, Huaming Yu1, Piao Qing1

  • 1State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China.

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Thiamine hydrochloride (TH) additive stabilizes the zinc metal anode in aqueous zinc-ion batteries (ZIBs) by preventing dendrite formation and side reactions. This enhances battery lifespan and performance.

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Aqueous zinc-ion batteriesDouble-coordination effectElectric double layerElectrolyte additivesZinc metal anodes

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Aqueous zinc-ion batteries (ZIBs) are promising for energy storage.
  • Reversible zinc metal anode cycling is crucial but hindered by unstable interfaces.
  • Interfacial side reactions and dendrite growth limit ZIB performance.

Purpose of the Study:

  • To improve the stability and reversibility of zinc metal anodes in ZIBs.
  • To investigate the role of thiamine hydrochloride (TH) as an electrolyte additive.
  • To enhance the cycle life and performance of ZIBs.

Main Methods:

  • Electrochemical deposition and dissolution studies.
  • Spectroscopic characterizations (e.g., XPS, FTIR) to analyze interface chemistry.
  • Electrochemical performance testing of zinc anodes and full cells.

Main Results:

  • Thiamine hydrochloride (TH) adsorbs onto the zinc anode via Zn-N and Zn-S coordination bonds.
  • TH forms hydrogen bonds with water, guiding Zn2+ diffusion and preventing dendrites.
  • TH suppresses interfacial side reactions, enabling dendrite-free deposition.
  • Ultra-long cycle lifespan of 2045 h at 1 mA cm-2 and 773 h at 5 mA cm-2 achieved.
  • Improved capacity retention and rate performance in Zn//NVO full cells.

Conclusions:

  • Thiamine hydrochloride (TH) effectively stabilizes the anode/electrolyte interface (AEI) in ZIBs.
  • TH promotes reversible zinc deposition and inhibits detrimental side reactions.
  • The coordinated TH layer enhances the overall stability and practical applicability of ZIBs.