Graphite electrode destroyed in electrolysis

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SUMMARY

The discussion centers on the degradation of graphite electrodes in a Hoffman apparatus during electrolysis, specifically when using a makeshift power supply from an Xbox power block and battery acid as the electrolyte. The negative graphite electrode disintegrates into powder, leading to a cessation of gas production and the formation of black mush in the electrolyte. The primary conclusion is that the graphite electrode's composition is likely the cause of its failure, and a recommendation is made to use carbon fibers as a more durable alternative.

PREREQUISITES
  • Understanding of electrolysis principles
  • Familiarity with Hoffman apparatus construction
  • Knowledge of materials used in electrodes, specifically graphite and carbon fibers
  • Basic electrical circuit knowledge, particularly with power supplies
NEXT STEPS
  • Research the properties and applications of carbon fibers in electrolysis
  • Explore alternative electrolytes for improved electrode longevity
  • Learn about the effects of different power supplies on electrolysis efficiency
  • Investigate electrode materials and their degradation mechanisms in electrolysis
USEFUL FOR

Electrochemists, hobbyists building electrolysis setups, and materials scientists interested in electrode performance and durability.

Samson4
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I built a Hoffman apparatus with graphite electrodes. I hooked it up to a make shift power supply from an xbox powerblock. It was filled with battery acid for the electrolyte. Now, the graphite electrode is 99% graphite rod.

For some reason the graphite electrode on the negative(black) connection turns to powder. It stops producing gas; upon inspection, I find black mush floating in the electrolyte. Can anyone shed some light on the reason why? I'm tired of redoing this. It also happened with corrugated graphite ribbon electrodes.
 
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Samson4 said:
For some reason the graphite electrode on the negative(black) connection turns to powder. It stops producing gas; upon inspection, I find black mush floating in the electrolyte. Can anyone shed some light on the reason why?

The graphite electrode turns to powder because it is made of powder. Use carbon fibers instead.
 

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