“…Carbon nanotubes (CNTs) have recently become popular to be used as carbon support in electrocatalysts because of their extraordinary electrical, chemical, mechanical, and thermal characteristics, particularly their high surface-tovolume ratio (Lilloja et al, 2021;Devrim & Arıca, 2020;Mohideen et al, 2020;Fard et al, 2020;Wang et al, 2020d;Antolini, 2007;Matsumoto et al, 2004;Coq et al, 1998). Similarly, multi-walled carbon nanotubes (MWNTs) have attracted some attention as the superior carbon support for electrocatalysts (Wang et al, 2023;Bekmezci et al, 2023;Yang et al, 2019;Xu et al, 2006;Wu et al, 2005;Li et al, 2003). However, the most popular type of carbon support material for PEMFCs is still Vulcan XC-72 carbon black (Şahin et al, 2023;Alawadhi et al, 2020;Sapkota et al, 2022;Liu et al, 2004;Matsumoto et al, 2004;Bock et al, 2004).…”