Hydrogen Bond Donors Influence on the Electrochemical Performance of Composite Graphene Electrodes/Deep Eutectic Solvents Interface
Round 1
Reviewer 1 Report
In his manuscript, Dr Brandao describe the effect of DES (Deep Eutectic Solvant) composition to the performance of graphene / graphite materials for energy storage. The paper is well written and many characterisations were done to demonstrate the influence of the DES. Thus it is recommended that this manuscript be accepted for publication in Electrochem once the authors revise it by addressing the following minor points:
- text editing: line 92-94 graphite and graphene should be removed .
- legend of figure 2 G_REF should be replaced by "commercial graphene"
- on figure 4 the legends into figure should be homogeneous.
- in materials & Methods, authors should describe briefly the fabrication of graphene/Graphite modified electrodes even if it is already published.
- did authors try to change the area density of carbon in their composites ?
- in conclusion authors may introduce some perspectives. Graphene and graphite is a long story and I do not see some future improvements of such studies.
Author Response
Dear reviewer,
Please find attached the file with our comments.
Kind regards
Author Response File: 
Author Response.pdf
Reviewer 2 Report
The authors presents a study on the effect of composition of deep eutectic solvents with two different H2 bond donors on the electrochemical performance of carbon allotropes composite electrodes. This is a reasonably good study and presents interesting results relevant to the energy research field. I recommend to publish this article in electrochem after minor corrections/ attending few comments.
- The studies and results presented are supported by electrochemical measurements/analysis, however lacks some details such as the influence of different physico-chemical parameters of DES on the capacitance etc. Such detailed studies would add relevant information and would be interesting for the readers (But not absolutely necessary to publish these results in the current form).
- Is it possible to do N2 adsorption-desorption isotherm studies on a single layer of graphene (exfoliated and transformed to a substrate for instance) within the same electrochemical system and see whether the experimental surface area calculations are matching with the theoretical values for graphene (2630 m2.g-1)?
- Could you please explain the rational behind the choice of two HBDs presented in the study?
- Regarding the redox peak observed around +0.4V, is there any evidence for the urea reduction at this potential range? Have you performed any background CVs for eg. to confirm this?
- Is there any literature evidence to support the suggestion that the higher capacitance retention for the R200 is due to the higher viscosity of the DES?
Author Response
Dear reviewer,
Please find attached the file with our comments.
Kind regards
Author Response File: Author Response.pdf
Reviewer 3 Report
Please see attached for comments.
Comments for author File: Comments.pdf
Author Response
Dear reviewer,
Please find attached the file with our comments.
Kind regards
Author Response File: Author Response.pdf
