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Related Concept Videos

Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Formation of Complex Ions03:45

Formation of Complex Ions

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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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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...
30.0K
Electrodeposition01:08

Electrodeposition

1.2K
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...
1.2K
Intermolecular Forces03:13

Intermolecular Forces

68.7K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Standard Electrode Potentials03:02

Standard Electrode Potentials

49.6K
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 Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction
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Gradient interfacial water dynamics for stable aqueous metal anodes.

Tianrui Zheng1, Zhengyu Ju1, Amy C Marschilok2,3,4,5

  • 1Materials Science and Engineering Program and Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712.

Proceedings of the National Academy of Sciences of the United States of America
|January 2, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a new hydrogel interlayer using vermiculite nanosheets to stabilize zinc anodes in aqueous batteries. This innovation improves battery longevity and performance for grid-scale energy storage.

Keywords:
Zn ion batteriesenergy storagegradient designwater dynamics

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous metal batteries offer safe and cost-effective grid-scale energy storage.
  • Dendritic growth and water side reactions limit the stability of aqueous zinc batteries.
  • High water activity in electrolytes hinders charge transport and high-rate performance.

Purpose of the Study:

  • To develop a stable zinc anode for aqueous batteries.
  • To address interfacial water dynamics and dendrite formation.
  • To enhance charge transport kinetics for high-rate operation.

Main Methods:

  • Fabrication of a gradient composite hydrogel interlayer with vermiculite (VMT) nanosheets in a polyacrylamide matrix.
  • Utilizing VMT nanosheets to bind free water and reduce its activity.
  • Tuning water activity gradients within the hydrogel for optimized ion transport.

Main Results:

  • Achieved stable cycling of Zn||Zn symmetric cells for over 2,000 hours at 5 mA cm-2.
  • Demonstrated sustained high current densities up to 40 mA cm-2.
  • Suppressed dendritic growth and parasitic side reactions at the zinc anode.

Conclusions:

  • The VMT-based hydrogel interlayer effectively regulates interfacial water dynamics, enhancing zinc anode stability.
  • Optimized water activity gradients facilitate high ion diffusion kinetics, enabling high-rate battery operation.
  • This approach advances the practical application of aqueous batteries for grid-scale energy storage.