PERTANIKA JOURNAL OF SCIENCE AND TECHNOLOGY

The growth in the development of renewable energy sources has led to tremendous attention to the research in energy storage systems. One of the electrochemical energy storage systems that have shown great potential to be used on a large scale is vanadium redox flow batteries (VRBs), as they possess flexible designs, long life cycles, and high energy density. Carbon felts (CF), and graphite felts (GF) have commonly been used as electrodes in VRBs. To improve market penetration using VRB technology, researchers have focused on electrode modifications to increase the power density and rate capabilities of VRBs. One of the carbon-based modifications which have shown significant improvements in the performance of VRBs is the use of graphene, which has outstanding electrochemical and physical characteristics as an electrocatalyst. In this review, electrochemical, physical, and other methods which have been reported in the graphene functionalization of graphite felt/carbon felt are discussed. The working principle and limiting methods were elaborated on and discussed for each method. Finally, recommendations for future developments are also highlighted.

• Al-Dhahebi, A. M., Ling, J., Krishnan, S. G., Yousefzadeh, M., Elumalai, N. K., Saheed, M. S. M., Ramakrishna, S., & Jose, R. (2022). Electrospinning research and products: The road and the way forward. Applied Physics Reviews, 9(1), Article 011319. https://doi.org/10.1063/5.0077959

• An, S. J., Zhu, Y., Lee, S. H., Stoller, M. D., Emilsson, T., Park, S., Velamakanni, A., An, J., & Ruoff, R. S. (2010). Thin film fabrication and simultaneous anodic reduction of deposited graphene oxide platelets by electrophoretic deposition. The Journal of Physical Chemistry Letters, 1(8), 1259-1263. https://doi.org/10.1021/jz100080c

• Bellani, S., Najafi, L., Prato, M., Oropesa-Nuñez, R., Martín-Garciá, B., Gagliani, L., Mantero, E., Marasco, L., Bianca, G., Zappia, M. I., Demirci, C., Olivotto, S., Mariucci, G., Pellegrini, V., Schiavetti, M., & Bonaccorso, F. (2021). Graphene-based electrodes in a vanadium redox flow battery produced by rapid low-pressure combined gas plasma treatments. Chemistry of Materials, 33(11), 4106-4121. https://doi.org/10.1021/acs.chemmater.1c00763

• Diba, M., Fam, D. W. H., Boccaccini, A. R., & Shaffer, M. S. P. (2016). Electrophoretic deposition of graphene-related materials: A review of the fundamentals. Progress in Materials Science, 82, 83-117. https://doi.org/10.1016/j.pmatsci.2016.03.002

• Ding, C., Zhang, H., Li, X., Liu, T., & Xing, F. (2013). Vanadium flow battery for energy storage: Prospects and challenges. The Journal of Physical Chemistry Letters, 4(8), 1281-1294. https://doi.org/10.1021/jz4001032

• González, Z., Flox, C., Blanco, C., Granda, M., Morante, J. R., Menéndez, R., & Santamaría, R. (2017). Outstanding electrochemical performance of a graphene-modified graphite felt for vanadium redox flow battery application. Journal of Power Sources, 338, 155-162. https://doi.org/10.1016/j.jpowsour.2016.10.069

• Gürsu, H., Gençten, M., & Şahin, Y. (2018). Cyclic voltammetric preparation of graphene-coated electrodes for positive electrode materials of vanadium redox flow battery. Ionics, 24(11), 3641-3654. https://doi.org/10.1007/s11581-018-2547-x

• Jing, M., Xu, Z., Fang, D., Fan, X., Liu, J., & Yan, C. (2019). Anchoring effect of the partially reduced graphene oxide doped electrospun carbon nanofibers on their electrochemical performances in vanadium flow battery. Journal of Power Sources, 425, 94–102. https://doi.org/10.1016/j.jpowsour.2019.04.003

• Li, W., Liu, J., & Yan, C. (2013). Reduced graphene oxide with tunable C/O ratio and its activity towards vanadium redox pairs for an all vanadium redox flow battery. Carbon, 55, 313-320. https://doi.org/10.1016/j.carbon.2012.12.069

• Li, W., Zhang, Z., Tang, Y., Bian, H., Ng, T. W., Zhang, W., & Lee, C. S. (2016). Graphene-nanowall-decorated carbon felt with excellent electrochemical activity toward VO2+/VO2+ couple for all vanadium redox flow battery. Advanced Science, 3(4), 1-7. https://doi.org/10.1002/advs.201500276

• Long, T., Long, Y., Ding, M., Xu, Z., Xu, J., Zhang, Y., Bai, M., Sun, Q., Chen, G., & Jia, C. (2021). Large scale preparation of 20 cm × 20 cm graphene modified carbon felt for high performance vanadium redox flow battery. Nano Research, 14(10), 3538-3544. https://doi.org/10.1007/s12274-021-3564-z

• Ma, Y., Han, J., Wang, M., Chen, X., & Jia, S. (2018). Electrophoretic deposition of graphene-based materials: A review of materials and their applications. Journal of Materiomics, 4(2), 108-120. https://doi.org/10.1016/j.jmat.2018.02.004

• Moghim, M. H., Eqra, R., Babaiee, M., Zarei-Jelyani, M., & Loghavi, M. M. (2017). Role of reduced graphene oxide as nano-electrocatalyst in carbon felt electrode of vanadium redox flow battery. Journal of Electroanalytical Chemistry, 789, 67-75. https://doi.org/10.1016/j.jelechem.2017.02.031

• Nia, P. M., Abouzari-lotf, E., Woi, P. M., Alias, Y., Ting, T. M., Ahmad, A., & Jusoh, N. W. C. (2018). Electrodeposited reduced graphene oxide as a highly efficient and low-cost electrocatalyst for vanadium redox flow batteries. Electrochimica Acta, 297, 31-39 https://doi.org/10.1016/j.electacta.2018.11.109

• Opar, D. O., Nankya, R., Lee, J., & Jung, H. (2020). Three-dimensional mesoporous graphene-modified carbon felt for high-performance vanadium redox flow batteries. Electrochimica Acta, 330, Article 135276. https://doi.org/10.1016/j.electacta.2019.135276

• Sankar, A., Michos, I., Dutta, I., Dong, J., & Angelopoulos, A. P. (2018). Enhanced vanadium redox flow battery performance using graphene nanoplatelets to decorate carbon electrodes. Journal of Power Sources, 387, 91-100. https://doi.org/10.1016/j.jpowsour.2018.03.045

• Tang, X., & Yan, X. (2017). Dip-coating for fibrous materials: mechanism, methods and applications. Journal of Sol-Gel Science and Technology, 81(2), 378-404. https://doi.org/10.1007/s10971-016-4197-7

• Xia, L., Zhang, Q., Wu, C., Liu, Y., Ding, M., Ye, J., Cheng, Y., & Jia, C. (2019). Graphene coated carbon felt as a high-performance electrode for all vanadium redox flow batteries. Surface and Coatings Technology, 358, 153-158. https://doi.org/10.1016/j.surfcoat.2018.11.024

• Zhang, C., Liang, P., Yang, X., Jiang, Y., Bian, Y., Chen, C., Zhang, X., & Huang, X. (2016). Biosensors and bioelectronics binder-free graphene and manganese oxide coated carbon felt anode for high-performance microbial fuel cell CF GO / CF rGO / CF. Biosensors and Bioelectronic, 81, 32-38. https://doi.org/10.1016/j.bios.2016.02.051