Kagome lattice materials have attracted significant research interest due to their unique electronic structures and emergent quantum phenomena. Three-dimensional kagome systems have been extensively investigated, while the exploration of two-dimensional (2D) kagome materials remains relatively limited, presenting both scientific challenges and opportunities. In this work, through systematic first-principles calculations, $M{\mathrm{B}}_6$ ($M=\mathrm{In},\mathrm{Tl}$), featuring in bilayer kagome borophene, are predicted to exhibit remarkable phonon-mediated superconductivity. These two compounds display superconducting transition temperatures ($T_c$) of 7.0 and 5.0 K, respectively, which are nearly two orders of magnitude higher than the 0.03 K predicted in intrinsic bilayer kagome borophene. Our analysis reveals that the coupling between B-$p_z$, $M\text{−}{p}_x/p_y$ ($M=\mathrm{In},\mathrm{Tl}$) electrons and low-frequency phonons of metal atoms contributes greatly to their superconductivity. Notably, $M{\mathrm{B}}_6$ ($M=\mathrm{In},\mathrm{Tl}$) possess nontrivial band topology, suggesting the potential candidates for topological superconductivity. This work not only expands the family of 2D superconducting materials, but also provides a theoretical exploration for novel quantum phenomena in kagome systems.

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• Electrical properties
• Low-temperature superconductors
• Superconductivity
• Topological materials