Harvesting the Gas Molecules by Bioinspired Design of 1D/2D Hybrids Toward Sensitive Acetone Detecting

Single-atom catalysts (SACs) are highly attractive in many surface-dependent reactions due to their extraordinary reactivity and maximum atomic efficiency. However, in a practical catalytic system, guiding and transferring the reactant molecules to target single-atom sites are crucial processes for achieving high-efficient reactions. Herein, gas-microchannels on TiO₂ nanorod-supported Pt single-atom catalyst by in situ growing derivative TiO₂ nanosheets are constructed. Those perpendicular-grown TiO₂ nanosheets can guide gas molecules to the reactive single Pt sites and thus realize an intact system of guidance-transfer-reaction. Experimentally, the local coordination and electronic states of Pt species decrease with the growth of nanosheets, which could significantly strengthen the adsorption and activation of oxygen molecules toward the acetone sensing. The final Pt₁/TiO₂ catalysts exhibit a high sensing response (13.6–50 ppm) to acetone gas, which are approximately three times higher than that of catalysts without scaly shell (4.8–50 ppm).