I would like to ask about the best method for reducing graphene oxide by ascorbic acid. Is it necessary to use high temperature or it can be performed at room temperature?
Currently I use to reduce graphene oxide by the following procedure:
1. Solvothermal reduction in aqueous media at 120 ºC for 48 h.
2. Addition of ascorbic acid to the black product from the previous stage in a proportion of 20/1 w/w, typically 15 g of ascorbic acid to 0,75 of GO.
I don´t know if the application of the combination of solvothermal and chemical reduction is unnecessary and I would like to optimize the process in terms of time and efficiency.
Dear Dr Rodolfo Fernández-Martínez
I have done experiments for cote r-GO on nano heterostructure. In this synthesis pathway, L-ascorbic acid was the reducing agent. Based on my experience I would like to say single-step reduction can fulfil your requirement. The solvothermal reduction would be the most effective due to the universal reducing effect than the chemical method.
However, you can increase the rate of reduction and reaction time can be reduced in high-temperature solvothermal reactions by using a low boiling point solvent. You can do 180 ºC for 4 hr and resulted black powder need to characterize by Raman for Id/Ig analysis to understand the reducing efficiency.
Dear Dr. Rodolfo Fernández-Martínez thank you for sharing this very interesting chemical question. I have also done experiments for the reduction of GO by L-ascorbic acid, TFA, supercritical alcohol under different conditions. The essential advantage of the solvothermal method is that by raising the temperature and pressure to the critical point, practically any substance can be dissolved in the solvent. you can optimize the process by increasing temperature and reducing time. If you want to process the reaction at a lower temperature, then use TFA.
Also please have a look at the following potentially useful article:
Reduction of graphene oxide viaL-ascorbic acid
Article Reduction of graphene oxide via L-ascorbic acid
One-pot reduction of graphene oxide at subzero temperatures
Article One-pot reduction of graphene oxide at subzero temperatures
The reduction of graphene oxide
Article The reduction of graphene oxide
I hope this helps. Good luck with your work!
In our work we tested the reduction effect of different reducing agents. We observed that reduction of L-ascorbic acid at lower temperatures gives the best electrocatalytic activity. Reduction at high temperatures requires less time, however which also damages the surface of rGO. you can see the comparison work below.
https://www.sciencedirect.com/science/article/abs/pii/S0021979720302307
Best Regards
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