How is the current density solved for in an electrolyzer unit?

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Discussion Overview

The discussion revolves around the determination of current density in an electrolyzer unit, specifically in the context of hydrogen production through electrolysis. Participants explore the relevant area for calculating current density, considering different aspects of the electrolysis apparatus.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions what area is used to calculate current density in hydrogen production.
  • Another suggests that the cross-sectional area of the electrolyte in the reaction volume may be relevant.
  • A different participant proposes that the electrode surface could be the area of interest for this calculation.
  • There is a mention of a Tafel plot, though its relevance is not elaborated upon.
  • A later reply reiterates the suggestion of using the electrode surface as the area for current density calculation.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the appropriate area for calculating current density, with no consensus reached on a definitive answer.

Contextual Notes

The discussion includes references to specific types of electrolyzers, such as alkaline electrolyzers, and the setup involving a battery and ammeter, which may influence the interpretation of the area in question.

Who May Find This Useful

This discussion may be of interest to individuals studying electrolysis, hydrogen production, or those involved in designing or analyzing electrolyzer units.

Shan43
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Hydrogen production rate is typically measured in current density, but what is the area in which the current is divided by to find such a value?
 
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Shan43 said:
Hydrogen production rate is typically measured in current density, but what is the area in which the current is divided by to find such a value?
Maybe the cross-sectional area of the electrolyte in the reaction volume of the electrolysis apparatus? Can you post some links to what you have been reading about electrolysis to help us understand your question better?

https://en.wikipedia.org/wiki/Electrolysis

1641426785838.png
 
Electrode surface.
 
Tafel plot?
 
berkeman said:
Maybe the cross-sectional area of the electrolyte in the reaction volume of the electrolysis apparatus? Can you post some links to what you have been reading about electrolysis to help us understand your question better?

https://en.wikipedia.org/wiki/Electrolysis

View attachment 295166
Well this wasn't based off of much reading per say, but for context I'm talking about an alkaline electrolyzer where a battery (9V battery that alligator clips can attatch to) serves as a power source and wires connect to an ammeter which would then connect to an electrode. The charge will flow through the electrolyte solution to other electrode which connects through a wire back to the battery on the negative end. What would the area the current should be divided by in this context?

Sorry for the late reply btw
 
Shan43 said:
The charge will flow through the electrolyte solution to other electrode which connects through a wire back to the battery on the negative end. What would the area the current should be divided by in this context?
It seems like Borek's reply applies Occam's Razor:
Borek said:
Electrode surface.
 
berkeman said:
It seems like Borek's reply applies Occam's Razor:
Ok, thank you guys very much!
 
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