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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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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method
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Superwetting Electrodes for Gas-Involving Electrocatalysis.

Wenwen Xu1, Zhiyi Lu2, Xiaoming Sun1,3

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering , Beijing University of Chemical Technology , Beijing 100029 , P. R. China.

Accounts of Chemical Research
|June 9, 2018
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Summary

Superwetting electrodes with nanoarray structures enhance gas management in electrochemical reactions. These biomimetic surfaces improve reaction rates and energy efficiency for applications like water splitting and fuel cells.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Surface Science

Background:

  • Gas-involving electrochemical reactions are crucial for energy conversion.
  • Efficient gas management is vital for high reaction rates and industrial applications.
  • Biomimetic surfaces with micro/nanostructures offer unique wetting capabilities for gas management.

Purpose of the Study:

  • To summarize recent work on understanding and achieving superwetting properties of electrode surfaces.
  • To present the design and fabrication of superwetting electrodes for gas-involving electrochemical reactions.
  • To analyze the feasibility of superwetting electrodes for enhancing electrochemical reaction performance.

Main Methods:

  • Defining criteria for superaerophobic and superaerophilic surfaces.
  • Utilizing nanoarray-based surface engineering to achieve superwetting properties.
  • Fabricating superwetting electrodes using hydrothermal reactions, electrodeposition, and vapor phase growth.

Main Results:

  • High roughness of nanoarray architecture is critical for superaerophobic and superaerophilic surfaces.
  • Superaerophobic electrodes accelerate gas bubble evolution, leading to faster and more stable currents for gas evolution reactions (hydrogen, oxygen, hydrazine oxidation).
  • Superaerophilic electrodes enhance gas diffusion and electron transport for gas consumption reactions (oxygen reduction reaction).

Conclusions:

  • Superwetting electrodes significantly improve the performance of gas-involving electrochemical reactions compared to traditional planar electrodes.
  • Energy conversion systems utilizing superwetting electrodes demonstrate higher energy efficiencies.
  • Further exploration of superwetting electrodes holds promise for advanced energy conversion technologies.