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We report protonation in several compounds by an ionic-liquid-gating method,with optimized gating conditions. This leads to single superconducting phasesfor several compounds. Non-volatility of protons allow post-gatingmagnetization and transport measurements. The superconducting transitiontemperature $T_C$ is enhanced to 43.5~K for FeSe$_{0.93}$S$_{0.07}$, and 41~Kfor FeSe after protonation. Superconductivity with $T_c$$\approx$15~K forZrNCl, $\approx$7.2~K for 1$T$-TaS$_2$, and $\approx$3.8~K for Bi$_2$Se$_3$ areinduced after protonation. Electric transport in protonatedFeSe$_{0.93}$S$_{0.07}$ confirms high-temperature superconductivity. Our$^{1}$H NMR measurements on protonated FeSe$_{1-x}$S$_{x}$ reveal enhancedspin-lattice relaxation rate $1/^{1}T_1$ with increasing $x$, which isconsistent with LDA calculations that H$^{+}$ are located in the interstitialsites close to the anions.

Ionic-liquid-gating induced protonation and superconductivity in FeSe, FeSe0.93S0.07, ZrNCl, 1T-TaS2, and Bi2Se3