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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...
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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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Local reaction environment in electrocatalysis.

Chaojie Chen1, Huanyu Jin1, Pengtang Wang1

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Manipulating the local reaction environment, beyond traditional electrocatalyst design, significantly boosts electrocatalytic performance. This review details strategies for optimizing reaction conditions to enhance electrocatalysis.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Electrocatalyst performance is traditionally enhanced through material modification.
  • Emerging research highlights the impact of the local reaction environment on electrocatalytic processes.
  • Understanding and engineering this environment is crucial for advancing electrocatalysis.

Purpose of the Study:

  • To critically review recent advancements in local reaction environment engineering for electrocatalysis.
  • To comprehensively assess the strategies and principles involved in manipulating the reaction environment.
  • To identify future research directions in this emerging field.

Main Methods:

  • Review of recent literature on local reaction environment engineering.
  • Analysis of interactions between surface structure, ion distribution, and local electric fields.
  • Discussion of protocols for modifying interfacial reactant concentration, mass transport, adsorption/desorption, and binding energy.
  • Evaluation of electrode physical structures and reaction cell configurations.
  • Integration of *operando* investigation techniques.

Main Results:

  • Local reaction environment engineering offers significant performance enhancements for various electrocatalytic reactions.
  • Key factors influencing the local environment include surface structure, ion distribution, and electric fields.
  • Protocols like controlling interfacial concentration and mass transport, alongside electrode/cell design, are effective.
  • *Operando* studies confirm the benefits of rational local environment modifications.

Conclusions:

  • Rational engineering of the local reaction environment significantly enhances electrocatalytic processes by optimizing interface thermodynamics and kinetics.
  • This approach offers a powerful complementary strategy to conventional electrocatalyst design.
  • Further research is needed for a comprehensive understanding and effective modulation of the local reaction environment for broader applications.