High-Density Dual-Structure Single-Atom Pt Electrocatalyst for Efficient Hydrogen Evolution and Multimodal Sensing
Tianshu Chu, Guiying Wang, Xiangyu Zhang, Yanyan Jia, Sheng Dai, Xinzhi Liu, Li Zhang, Xuan Yang, Bowei Zhang, Fu‐Zhen Xuan
Abstract
Herein, we report a high-density dual-structure single-atom catalyst (SAC) by creating a large number of vacancies of O and Ti in two-dimensional (2D) Ti 3 C 2 to immobilize Pt atoms (SA Pt-Ti 3 C 2 ). The SA Pt-Ti 3 C 2 showed excellent performance toward the pH-universal electrochemical hydrogen evolution reaction (HER) and multimodal sensing. For HER catalysis, compared to the commercial 20 wt % Pt/C, the Pt mass activities of SA Pt-Ti 3 C 2 at the overpotentials of ∼30 and 110 mV in acid and alkaline media are 45 and 34 times higher, respectively. More importantly, during the alkaline HER process, an interesting synergetic effect between Pt-C and Pt-Ti sites that dominated the Volmer and Heyrovsky steps, respectively, was revealed. Moreover, the SA Pt-Ti 3 C 2 catalyst exhibited high sensitivity (0.62–2.65 μA μM –1 ) and fast response properties for the multimodal identifications of ascorbic acid, dopamine, uric acid, and nitric oxide under the assistance of machine learning.