Carbon Letters

Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.

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Quartiles

The set of journals have been ranked according to their SJR and divided into four equal groups, four quartiles. Q1 (green) comprises the quarter of the journals with the highest values, Q2 (yellow) the second highest values, Q3 (orange) the third highest values and Q4 (red) the lowest values.

Category	Year	Quartile
Ceramics and Composites	2015	Q2
Ceramics and Composites	2016	Q1
Ceramics and Composites	2017	Q2
Ceramics and Composites	2018	Q2
Ceramics and Composites	2019	Q2
Ceramics and Composites	2020	Q3
Ceramics and Composites	2021	Q3
Ceramics and Composites	2022	Q2
Ceramics and Composites	2023	Q1
Energy Engineering and Power Technology	2015	Q2
Energy Engineering and Power Technology	2016	Q1
Energy Engineering and Power Technology	2017	Q2
Energy Engineering and Power Technology	2018	Q2
Energy Engineering and Power Technology	2019	Q2
Energy Engineering and Power Technology	2020	Q3
Energy Engineering and Power Technology	2021	Q3
Energy Engineering and Power Technology	2022	Q2
Energy Engineering and Power Technology	2023	Q2
Inorganic Chemistry	2015	Q3
Inorganic Chemistry	2016	Q2
Inorganic Chemistry	2017	Q3
Inorganic Chemistry	2018	Q3
Inorganic Chemistry	2019	Q3
Inorganic Chemistry	2020	Q3
Inorganic Chemistry	2021	Q3
Inorganic Chemistry	2022	Q2
Inorganic Chemistry	2023	Q1
Materials Chemistry	2015	Q2
Materials Chemistry	2016	Q1
Materials Chemistry	2017	Q2
Materials Chemistry	2018	Q2
Materials Chemistry	2019	Q2
Materials Chemistry	2020	Q3
Materials Chemistry	2021	Q2
Materials Chemistry	2022	Q2
Materials Chemistry	2023	Q1
Organic Chemistry	2015	Q3
Organic Chemistry	2016	Q2
Organic Chemistry	2017	Q3
Organic Chemistry	2018	Q3
Organic Chemistry	2019	Q3
Organic Chemistry	2020	Q3
Organic Chemistry	2021	Q3
Organic Chemistry	2022	Q2
Organic Chemistry	2023	Q1
Process Chemistry and Technology	2015	Q2
Process Chemistry and Technology	2016	Q2
Process Chemistry and Technology	2017	Q2
Process Chemistry and Technology	2018	Q2
Process Chemistry and Technology	2019	Q2
Process Chemistry and Technology	2020	Q3
Process Chemistry and Technology	2021	Q3
Process Chemistry and Technology	2022	Q2
Process Chemistry and Technology	2023	Q2
Renewable Energy, Sustainability and the Environment	2015	Q2
Renewable Energy, Sustainability and the Environment	2016	Q2
Renewable Energy, Sustainability and the Environment	2017	Q3
Renewable Energy, Sustainability and the Environment	2018	Q3
Renewable Energy, Sustainability and the Environment	2019	Q3
Renewable Energy, Sustainability and the Environment	2020	Q3
Renewable Energy, Sustainability and the Environment	2021	Q3
Renewable Energy, Sustainability and the Environment	2022	Q3
Renewable Energy, Sustainability and the Environment	2023	Q2

SJR

The SJR is a size-independent prestige indicator that ranks journals by their 'average prestige per article'. It is based on the idea that 'all citations are not created equal'. SJR is a measure of scientific influence of journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from It measures the scientific influence of the average article in a journal, it expresses how central to the global scientific discussion an average article of the journal is.

Year	SJR
2015	0.438
2016	0.686
2017	0.440
2018	0.423
2019	0.399
2020	0.380
2021	0.409
2022	0.576
2023	0.855

Total Documents

Evolution of the number of published documents. All types of documents are considered, including citable and non citable documents.

Year	Documents
2014	3
2015	40
2016	55
2017	59
2018	64
2019	67
2020	74
2021	113
2022	128
2023	217

Citations per document

This indicator counts the number of citations received by documents from a journal and divides them by the total number of documents published in that journal. The chart shows the evolution of the average number of times documents published in a journal in the past two, three and four years have been cited in the current year. The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric.

Cites per document	Year	Value
Cites / Doc. (4 years)	2014	0.000
Cites / Doc. (4 years)	2015	4.000
Cites / Doc. (4 years)	2016	2.023
Cites / Doc. (4 years)	2017	1.459
Cites / Doc. (4 years)	2018	1.866
Cites / Doc. (4 years)	2019	2.087
Cites / Doc. (4 years)	2020	1.816
Cites / Doc. (4 years)	2021	2.337
Cites / Doc. (4 years)	2022	3.519
Cites / Doc. (4 years)	2023	5.495
Cites / Doc. (3 years)	2014	0.000
Cites / Doc. (3 years)	2015	4.000
Cites / Doc. (3 years)	2016	2.023
Cites / Doc. (3 years)	2017	1.459
Cites / Doc. (3 years)	2018	1.870
Cites / Doc. (3 years)	2019	2.079
Cites / Doc. (3 years)	2020	1.821
Cites / Doc. (3 years)	2021	2.454
Cites / Doc. (3 years)	2022	3.957
Cites / Doc. (3 years)	2023	5.952
Cites / Doc. (2 years)	2014	0.000
Cites / Doc. (2 years)	2015	4.000
Cites / Doc. (2 years)	2016	2.023
Cites / Doc. (2 years)	2017	1.411
Cites / Doc. (2 years)	2018	1.825
Cites / Doc. (2 years)	2019	2.073
Cites / Doc. (2 years)	2020	1.573
Cites / Doc. (2 years)	2021	2.879
Cites / Doc. (2 years)	2022	4.374
Cites / Doc. (2 years)	2023	6.440

Total Cites

Self-Cites

Evolution of the total number of citations and journal's self-citations received by a journal's published documents during the three previous years.
Journal Self-citation is defined as the number of citation from a journal citing article to articles published by the same journal.

Cites	Year	Value
Self Cites	2014	0
Self Cites	2015	1
Self Cites	2016	26
Self Cites	2017	26
Self Cites	2018	49
Self Cites	2019	43
Self Cites	2020	39
Self Cites	2021	59
Self Cites	2022	152
Self Cites	2023	289
Total Cites	2014	0
Total Cites	2015	12
Total Cites	2016	87
Total Cites	2017	143
Total Cites	2018	288
Total Cites	2019	370
Total Cites	2020	346
Total Cites	2021	503
Total Cites	2022	1005
Total Cites	2023	1875

External Cites per Doc

Cites per Doc

Evolution of the number of total citation per document and external citation per document (i.e. journal self-citations removed) received by a journal's published documents during the three previous years. External citations are calculated by subtracting the number of self-citations from the total number of citations received by the journal’s documents.

Cites	Year	Value
External Cites per document	2014	0
External Cites per document	2015	3.667
External Cites per document	2016	1.419
External Cites per document	2017	1.194
External Cites per document	2018	1.552
External Cites per document	2019	1.837
External Cites per document	2020	1.616
External Cites per document	2021	2.166
External Cites per document	2022	3.358
External Cites per document	2023	5.035
Cites per document	2014	0.000
Cites per document	2015	4.000
Cites per document	2016	2.023
Cites per document	2017	1.459
Cites per document	2018	1.870
Cites per document	2019	2.079
Cites per document	2020	1.821
Cites per document	2021	2.454
Cites per document	2022	3.957
Cites per document	2023	5.952

% International Collaboration

International Collaboration accounts for the articles that have been produced by researchers from several countries. The chart shows the ratio of a journal's documents signed by researchers from more than one country; that is including more than one country address.

Year	International Collaboration
2014	0.00
2015	15.00
2016	21.82
2017	8.47
2018	20.31
2019	13.43
2020	16.22
2021	22.12
2022	18.75
2023	22.58

Citable documents

Non-citable documents

Not every article in a journal is considered primary research and therefore "citable", this chart shows the ratio of a journal's articles including substantial research (research articles, conference papers and reviews) in three year windows vs. those documents other than research articles, reviews and conference papers.

Documents	Year	Value
Non-citable documents	2014	0
Non-citable documents	2015	0
Non-citable documents	2016	1
Non-citable documents	2017	2
Non-citable documents	2018	4
Non-citable documents	2019	4
Non-citable documents	2020	4
Non-citable documents	2021	2
Non-citable documents	2022	2
Non-citable documents	2023	1
Citable documents	2014	0
Citable documents	2015	3
Citable documents	2016	42
Citable documents	2017	96
Citable documents	2018	150
Citable documents	2019	174
Citable documents	2020	186
Citable documents	2021	203
Citable documents	2022	252
Citable documents	2023	314

Cited documents

Uncited documents

Ratio of a journal's items, grouped in three years windows, that have been cited at least once vs. those not cited during the following year.

Documents	Year	Value
Uncited documents	2014	0
Uncited documents	2015	0
Uncited documents	2016	13
Uncited documents	2017	33
Uncited documents	2018	41
Uncited documents	2019	48
Uncited documents	2020	55
Uncited documents	2021	45
Uncited documents	2022	35
Uncited documents	2023	24
Cited documents	2014	0
Cited documents	2015	3
Cited documents	2016	30
Cited documents	2017	65
Cited documents	2018	113
Cited documents	2019	130
Cited documents	2020	135
Cited documents	2021	160
Cited documents	2022	219
Cited documents	2023	291