Chu Tianshu, Wang Guiying, Zhang Xiangyu, Jia Yanyan, Dai Sheng, Liu Xinzhi, Zhang Li, Yang Xuan, Zhang Bowei, Xuan Fu-Zhen
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China.
Nano Lett. 2024 Aug 7;24(31):9666-9674. doi: 10.1021/acs.nanolett.4c02428. Epub 2024 Jul 29.
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) TiC to immobilize Pt atoms (SA Pt-TiC). The SA Pt-TiC 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-TiC 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-TiC catalyst exhibited high sensitivity (0.62-2.65 μA μM) and fast response properties for the multimodal identifications of ascorbic acid, dopamine, uric acid, and nitric oxide under the assistance of machine learning.
在此，我们通过在二维（2D）TiC中产生大量的O和Ti空位来固定Pt原子（SA Pt-TiC），从而报道了一种高密度双结构单原子催化剂（SAC）。SA Pt-TiC对pH通用的电化学析氢反应（HER）和多模态传感表现出优异的性能。对于HER催化，与商业20 wt% Pt/C相比，SA Pt-TiC在酸性和碱性介质中过电位约为30和110 mV时的Pt质量活性分别高45倍和34倍。更重要的是，在碱性HER过程中，揭示了分别主导Volmer和Heyrovsky步骤的Pt-C和Pt-Ti位点之间有趣的协同效应。此外，SA Pt-TiC催化剂在机器学习的辅助下，对抗坏血酸、多巴胺、尿酸和一氧化氮的多模态识别表现出高灵敏度（0.62 - 2.65 μA μM）和快速响应特性。
