We present a comprehensive first-principles investigation of the structural stability, vibrational characteristics, and superconducting properties of the Janus ${\mathrm{Ti}}_2\mathrm{CSH}$ monolayer. Janus MXene (JMXene) materials, such as ${\mathrm{Ti}}_2\mathrm{CSH}$, have attracted significant attention because of their intrinsic two-dimensional structure and the absence of out-of-plane symmetry, which give rise to novel physical phenomena. Phonon calculations confirm the dynamical stability of the monolayer, while electronic structure and electron-phonon coupling analyses reveal a strong phonon-mediated pairing mechanism. Anisotropic Migdal-Eliashberg theory predicts a single-gap superconducting state, with gap values between 4.29 and 4.71 meV at 10 K and a critical temperature ($T_c$) of 22.6 K. These findings demonstrate that hydrogenation of ${\mathrm{Ti}}_2{\mathrm{CS}}_2$ into ${\mathrm{Ti}}_2\mathrm{CSH}$ significantly enhances superconductivity, thereby establishing ${\mathrm{Ti}}_2\mathrm{CSH}$ as a promising two-dimensional superconductor with potential applications in quantum and nanoscale technologies.

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• Crystal structure
• Superconductivity
• MXenes
• First-principles calculations