A level Chemistry Fuel cell help

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effertiti
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#1
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#1
It was about glucose-oxygen fuel cell

At the negative electrode glucose reacted with water to form CO2 and H+

At the positive electrode O2 reacts with H+ forming water

what is the half-equation for the negative and positive electrode? and the overall equation
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deskochan
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https://journals.plos.org/plosone/ar...atinum%20anode.
From this article,
glucose is not completely oxidized and the theoretical maximum rate of electron transfer from
glucose oxidation is not achieved in abiotically catalyzed glucose fuel cells.
Instead, glucose is principally oxidized to gluconic acid
Anode: C6H12O6 + H2O --> C6H12O7 (gluconic acid) + 2H+ + 2e-
Cathode : O2 + 4H+ + 4e- --> 2H2O
Overall : 2C6H12O6 + O2 --> 2C6H12O7
Last edited by deskochan; 1 year ago
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effertiti
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(Original post by deskochan)
https://journals.plos.org/plosone/ar...atinum%20anode.
From this article,
glucose is not completely oxidized and the theoretical maximum rate of electron transfer from
glucose oxidation is not achieved in abiotically catalyzed glucose fuel cells.
Instead, glucose is principally oxidized to gluconic acid
Anode: C6H12O6 + H2O --> C6H12O7 (gluconic acid) + 2H+ + 2e-
Cathode : O2 + 4H+ + 4e- --> 2H2O
Overall : 2C6H12O6 + O2 --> 2C6H12O7
apologies but... shouldn't the glucose produce carbon dioxide and hydrogen ions on the anode rather than gluconic acid?
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deskochan
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(Original post by effertiti)
apologies but... shouldn't the glucose produce carbon dioxide and hydrogen ions on the anode rather than gluconic acid?
Don't need to apologize because I also need to learn. As the scientific articles said, they found the glucose is not completely oxidized to carbon dioxide and usually oxidized to gluconic acid. Of course, I don't know whether it is in A level because I google relevant issues in A level but cannot be found. Thus, I still need open-minded and to learn and you tell me more about the source of the question and its relevance to the GCE A level.
Last edited by deskochan; 1 year ago
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effertiti
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#5
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(Original post by deskochan)
Don't need to apologize because I also need to learn. As the scientific articles said, they found the glucose is not completely oxidized to carbon dioxide and usually oxidized to gluconic acid. Of course, I don't know whether it is in A level because I google relevant issues in A level but cannot be found. Thus, I still need open-minded and to learn and you tell me more about the source of the question and its relevance to the GCE A level.
Ah it was an exam question that I had and I'm thinking about how badly i answered it
Last edited by effertiti; 1 year ago
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