Recent Research of NiCo₂O₄/Carbon Composites for Supercapacitors

Round 1

Reviewer 1 Report

This manuscript summarized the recent research report about of NiCo2O4/carbon composites for supercapacitors. The carbon materials include graphene/r-GO, CNT, and amorphous carbon. For comparison between these composites and the pure NiCo2O4, I suggest the authors also include the research results of pure NiCo2O4 as the electrode material. To illustrate a clear picture for readers, authors should add a table to list the composite materials, sample form (powder or film), and the capacitance property so that the advantage and disadvantage of the specific composite could be easily displayed.

Author Response

Thanks for your suggestion. We have added some research results of pure NiCo2O4 as the electrode material in the introduction section because there have been many pulished papers related to it. Some more pictures are added in the revision. Because the specific capacitance of materials have been mentioned in the maintext, we did not show them in a table.

Reviewer 2 Report

In this review article, the authors try to illustrate the current trends in NiCo₂O₄/Carbon composite-based supercapacitors, which is interesting and meaningful. However, some reasons prohibit us from considering this paper for direct publication in the present form. The article has several following issues which need to be fixed before publication.

1.     The importance of the work are not justified properly.

2.      As authors entitled as “Recent research of NiCo₂O₄/carbon composites for supercapacitors” for such application electrochemical data are also equally essential. So, we suggest to add required electrochemical data related to supercapacitor applications.

3.     Other major characterizations such as XRD-analysis, TEM-analysis data need to be added.

4.     As the authors indicate on page 1 (lines; 39,40 and 41) “Redox-capacitors usually have high specific capacitances, about 10-100 times more than those of EDLCs, but being restricted 40 by the poor conductivity, leading to limited rate capability and cycle stability”. We suggested authors to illustrate such evidence with suitable explanation.

 

5.     We recommend the authors should study from the following several works to perform test or simulation for exploiting the reason: ACS Appl. Mater. Interfaces 2022, 14, 20, 23285–23296 and Electrochem 2021, 2(2), 236-250.

Author Response

Thanks for your advice. 

These electrochemical parameters related to supercapacitors have added in the first paragraph of Introduction.

Other characterizations such as XRD-analysis, TEM-analysis data were also added.

“Redox-capacitors usually have high specific capacitances, about 10-100 times more than those of EDLCs”. It is because that "There are Faradic reactions occurring on the surface of the former one, while physical accumulation of double layer of charges forms at the interface of electrodes and electrolyte for EDLCs".

Some new references were added in the revised manuscript.

Round 2

Reviewer 2 Report

The authors revised the manuscript satisfactorily by addressing the reviewer's concerns. So I suggest accepting it as it is.