# Energy Storage in Carbon Fiber-Based Batteries: Trends and Future Perspectives
## 3 Results and Discussion
### Sources  
Of the 840 documents examined, the vast majority were published as journal articles (90.0%). To a significantly less extent, documents were published as conference/proceedings paper (7.6%) and review articles (2.1%). Only two documents (0.2%) were published as book chapters. Additionally, \"ACS Applied Materials & Interfaces\" (h-index: 25 and total citations: 2208), \"Journal of Materials Chemistry A\" (h-index: 23 and total citations: 1810), \"Electrochimica Acta\" (h-index: 22 and total citations: 1874), \"Journal of Power Sources\" (h-index: 21 and total citations: 1406), and \"Electrochimica Acta\" (h-index: 19 and total citations: 997) emerged as the top-5 sources when considering the h-index and total citations received. The detailed list of the most impactful sources is depicted in Table 3.  
Using [PERSON]'s law, the sources were further examined. The documents were further analyzed using clustering by coupling. Specifically, documents were set as the analysis unit, references were used as the coupling measurement and citation score was used as the impact measure. Moreover, the clustering algorithm used was Walktrap, the number of units were set to 250, and the min cluster frequency was set to 5 which are the default values suggested by the tool used in this study. Specifically, the sources were grouped into three clusters. Cluster 1 has the most impactful sources, followed by cluster 2 and cluster 3. Based on the outcomes, cluster 1 had 11 (4.4%) sources, cluster 2 had 42 (16.9%) sources, and cluster 3 had 195 (78.6%) sources. Moreover, cluster 1 had a total of 292 (34.8%) published documents, cluster 2 had 274 (32.6%) published documents, and cluster 3 also had 274 (32.6%) published documents. Table 4 presents the top-10 sources according to [PERSON]'s law. Out of all sources, \"ACS Applied Materials & Interfaces\", \"Electrochimica Acta\", \"Journal of Materials Chemistry A\", \"Chemical Engineering Journal\", and \"Journal of Alloys and Compounds\" arose as the top-5 most impactful ones following [PERSON]'s law.  
\begin{table}
\begin{tabular}{c c c c c} \hline
**Year** & **MeanTCperDoc** & **N** & **MeanTCperYear** & **CitableYears** \\ \hline
2013 & 109.47 & 17 & 9.12 & 12 \\
2014 & 95.31 & 16 & 8.66 & 11 \\
2015 & 33.08 & 25 & 3.31 & 10 \\
2016 & 60.89 & 36 & 6.77 & 9 \\
2017 & 50.92 & 66 & 6.36 & 8 \\
2018 & 68.18 & 83 & 9.74 & 7 \\
2019 & 54.25 & 89 & 9.04 & 6 \\
2020 & 40.95 & 111 & 8.19 & 5 \\
2021 & 24.4 & 106 & 6.1 & 4 \\
2022 & 16.73 & 144 & 5.58 & 3 \\
2023 & 7.69 & 147 & 3.85 & 2 \\ \hline \end{tabular}
\end{table}
Table 2: Annual scientific production and citations (2013–2023).  
\begin{table}
\begin{tabular}{c c c c c c c} \hline
**Sources** & **h-Index** & **g-Index** & **m-Index** & **TC** & **NP** & **PY\_Start** \\ \hline ACS Applied Materials \& Interfaces & 25 & 44 & 2.083 & 2208 & 44 & 2013 \\ Journal of Materials Chemistry A & 23 & 30 & 1.917 & 1810 & 30 & 2013 \\ Electrochimica Acta & 22 & 26 & 2.75 & 1874 & 26 & 2017 \\ Journal of Power Sources & 21 & 27 & 1.909 & 1406 & 27 & 2014 \\ Chemical Engineering Journal & 17 & 29 & 2.125 & 997 & 29 & 2017 \\ Small & 15 & 19 & 1.875 & 1012 & 19 & 2017 \\ Advanced Functional Materials & 14 & 15 & 1.273 & 1381 & 15 & 2014 \\ Carbon & 14 & 19 & 1.167 & 705 & 19 & 2013 \\ Nano Energy & 14 & 15 & 1.167 & 1480 & 15 & 2013 \\ \hline \end{tabular}
\end{table}
Table 3: Most impactful sources based on h-index and total citations.