“…In recent years, various studies focused on the development of late 3d transition metal-based systems as an alternative to costly noble metals for DMR catalysis. − , Within this context, nickel (Ni)-based catalysts are promising candidates due to their relatively high activity and earth abundance. Nevertheless, the major drawback of monometallic Ni-based catalysts when compared to noble metal-based catalysts is their lower activity and higher susceptibility to deactivation due to coke formation via either methane cracking or the reverse Boudouard reaction. − In order to increase catalyst activity and stability, researchers have implemented various approaches including (i) depositing the catalytic active phase on different support materials, , (ii) reducing the catalyst, particle size, , (iii) developing bimetallic catalysts based on transition metals, − and (iv) transition metal-based core–shell nanoarchitectures. − It has been shown that core-shell systems have the ability to prevent metal sintering and decrease carbon formation, while the production of bimetallic catalysts has been very successful in increasing the catalyst activity, stability, and selectivity. Among 3d transition metals, the addition of cobalt (Co) to Ni-based DMR catalysts results in the highest increase in activity.…”