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Related Concept Videos

Standard Electrode Potentials03:02

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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 p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
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Fabrication of VB2/Air Cells for Electrochemical Testing
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Built-in Electric Field in 1D/2D Heterostructure Boosts Zinc Air Battery Performance.

Xue Long1,2, Yuhua Xie2, Qing Li2

  • 1State Key Laboratory for Hubei New Textile Materials and Advanced Processing Technology, School of Materials Science and Engineering, Wuhan Textile University, 430200 Wuhan, China.

ACS Applied Materials & Interfaces
|September 19, 2024
PubMed
Summary

A novel cobalt oxide/cobalt disulfide (CoO/CoS2) heterostructure boosts rechargeable zinc-air battery (ZAB) performance by enhancing oxygen reactions. This breakthrough offers a promising energy storage solution.

Keywords:
Rechargeable zinc air batterybuild-in electric fieldheterostructureoxygen evolution reactionoxygen reduction reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Rechargeable zinc-air batteries (ZABs) face limitations due to poor oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) activities.
  • Developing efficient electrocatalysts is crucial for advancing ZAB technology.

Purpose of the Study:

  • To investigate a 1D/2D CoO/CoS2 heterostructure as an advanced electrocatalyst for ZABs.
  • To elucidate the mechanism behind the enhanced catalytic activity.

Main Methods:

  • Fabrication of a 1D/2D CoO/CoS2 heterostructure.
  • Electrochemical characterization of OER and ORR performance.
  • Analysis of electronic structure and charge transfer dynamics.

Main Results:

  • The CoO/CoS2 heterostructure exhibits significantly enhanced OER specific activity (3.8-fold over CoO, 2.2-fold over CoS2) and ORR kinetic current density (46-fold over CoO, 6.6-fold over CoS2).
  • Rechargeable ZABs utilizing CoO/CoS2 achieved a peak power density of 215.6 mW cm-2, outperforming Pt/C-IrO2.
  • The system demonstrated excellent stability, maintaining performance for 600 hours, and achieved 83.8 mW cm-2 in all-solid-state configurations.

Conclusions:

  • The built-in electric field in the CoO/CoS2 heterostructure effectively modulates electronic properties, mitigating intermediate adsorption and boosting catalytic activity.
  • The CoO/CoS2 heterostructure represents a highly efficient and durable electrocatalyst for high-performance rechargeable ZABs, including potential applications in wearable devices.