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The specific significance of the present findings is mainly relying on the new insights provided in relation to the surface chemistry and electronic properties of different types of sp2/sp3-hybridized nanocarbon materials. Given their extensive use in the field of catalysis, the present results provide valuable information in relation to the underlying mechanism of carbon-catalyzed reactions.

The novelty of the present work is the elucidation of the essential differences between conventional sp2-hybridized nanocarbons(NCs) and sp3-hybridized ultra-dispersed nanodiamonds(NDs) and theirs' derivatives(UNDDs), by means of advanced characterization techniques, such as EELS, XPS, etc. More importantly, probe reactions were employed to fully gain insight into structure-property relationships. The novelty level is considered very good.

The present findings clearly revealed that the differences in surface chemistry (e.g. oxygen defects) and electronic properties(e.g. work function) can be mainly accounted for the diferences in catalytic activity. In this regard, the superior reactivity of UNDDs can receive a consistent explanation; the specific electronic structure and the lower work function of UNDDs are mainly responsible for the enhanced catalytic activity.

Towards improving the abstract of the present article the following issues should be considered:
- it should outine the methods used to accomplish the main objectives
- it should shortly present the main findings
- it should draw the main conclusions

The latest advances in the field should be clearly stated and shortly discussed, in order the originality and the novelty of the present work to be revealed. In particular, the argument that"the essential differences between a UNDD system and conventional NCs in catalytic reactions have rarely been studied"should be justified. What about the studies so far performed in relation to surface chemistry and catalytic properties of NDs-based materials?

Although the latest works in the field are properly cited, there is no corresponding discussion about the recent developments in the field towards revealing the step beyond attempted in the present study. Since the present work aims at exploring the physicochemical properties of UNDDs, the recent advances in the field should be clearly stated.

Materials and Methods were not provided. However, based on the online supporting information of the aforementioned paper the following issues should be considered:
- Not enough information is provided about the preparation of GR and MWCNTs
- The reaction conditions(catalyst mass, flow rate, GHSV) should be clearly stated

YES. However, towards improving the impact of the present work the following issues could be considered:
Besides TPD, TPR studies could be also carried out to gain insight into the reactivity of different oxygen functional groups(surface, bulk, interface) as well as into the oxygen storage capacity (OSC). These studies are expected to shed more light towards establishing a more reliable structure-activity relationship.

To improve the impact of the present work towards publishing in a higher IF journal the following issues should be also considered:
1) The relationship between sp2(%), SBET and conductivity should be discussed in a more thorough manner.
2) The catalytic activity is mainly related with the work function.
It could be of major importance to provide/discuss the role of other identifying parameters(conductivity. oxygen abundance, surface area, etc) on the catalytic activity. Despite the fact that a completely different type of probe reactions is employed.
(one oxidation and one reduction process)a similar trend is obtained(Fig.5). An explanation should be provided.

YES

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The article could be published in journals of higher impact factor if suitably modified(see comments above). In that case new experiments in conjunction with major modifications are required by authors.

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