Citation: Erjun Lu, Junqian Tao, Can Yang, Yidong Hou, Jinshui Zhang, Xinchen Wang, Xianzhi Fu. Carbon-Encapsulated Pd/TiO₂ for Photocatalytic H₂ Evolution Integrated with Photodehydrogenative Coupling of Amines to Imines[J]. Acta Physico-Chimica Sinica, ;2023, 39(4): 221102. doi: 10.3866/PKU.WHXB202211029 shu

Carbon-Encapsulated Pd/TiO₂ for Photocatalytic H₂ Evolution Integrated with Photodehydrogenative Coupling of Amines to Imines

State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, China

Corresponding author: Jinshui Zhang, jinshui.zhang@fzu.edu.cn Xinchen Wang, xcwang@fzu.edu.cn
Received Date: 16 November 2022
Revised Date: 5 January 2023
Accepted Date: 5 January 2023
Available Online: 9 January 2023
Fund Project: the National Natural Science Foundation of China 21972022the National Natural Science Foundation of China 22072021the National Natural Science Foundation of China U21A20326

Supported metal nanocatalysts are promising candidates for heterogenous photocatalysis because the metal nanoparticles (e.g., Au, Pt, or Pd) loaded on the semiconductor surface not only act as a reductive cocatalyst, which accelerates the kinetics of reactions such as H⁺ reduction, but also trap the photoelectrons, which allows charge separation. Owing to these unique benefits, supported metal photocatalysts have been extensively studied for green H₂ production at the reductive side integrated with organic selective oxidation at the oxidative side in a closed photocatalytic redox cycle. Imines and their derivatives are important chemicals in the industrial production of functional polymers, agrochemicals, and pharmaceuticals. Recently, imines have been successfully produced via the photocatalytic dehydrogenative coupling of amines over supported metal nanocatalysts. However, owing to the strong adsorption of H atoms and imines on the metal surface, the produced imines are converted to secondary amines via a self-hydrogenation process, thus greatly decreasing the selectivity toward the desired imines. Herein, we demonstrate that the construction of an ultrathin carbon layer on a Pd/TiO₂ photocatalyst (Pd/TiO₂@C) via the thermal annealing of self-assembled polydopamine layers is a simple yet effective strategy to address this issue. Temperature-programmed reduction of hydro-oxygen titration and cyclic voltammetry curves for Pd/TiO₂vs. Pd/TiO₂@C indicate that the conformable coating of the carbon layer on the catalyst surface facilitates kinetic control of H atom adsorption on the supported Pd nanoparticles. Furthermore, in situ Fourier-transform infrared spectroscopy demonstrates that the conformably coated ultrathin carbon layer also decreases the adsorption of substrate molecules such as N-benzylidenebenzylamine on the catalyst surface, which weakens their interaction with the supported Pd nanoparticles. Thus, the construction of an ultrathin conformable carbon coating on Pd/TiO₂ is a facile strategy to kinetically control the adsorption behavior of H atoms and imines on the Pd surface during photocatalytic redox reactions, which can suppress the excessive hydrogenation of imines toward selectivity improvement. In addition, owing to the strong electronic interaction between the Pd nanoparticles and the carbon layer, the encapsulated Pd nanoparticles retain their unique catalytic properties toward the H₂ evolution reaction. As a result, Pd/TiO₂@C with an optimized carbon layer thickness facilitates improved photocatalytic synthesis of imines, with conversion and selectivity as high as 95% and 99%, respectively. This study provides an effective strategy to develop high-performance supported metal nanocatalysts for integrated photocatalytic systems to produce H₂ and valuable organic chemicals.
- Photocatalysis,
- Hydrogen evolution reaction,
- Amine oxidative coupling,
- Supported metal nanocatalysts,
- Surface modification
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Carbon-Encapsulated Pd/TiO2 for Photocatalytic H2 Evolution Integrated with Photodehydrogenative Coupling of Amines to Imines

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Carbon-Encapsulated Pd/TiO₂ for Photocatalytic H₂ Evolution Integrated with Photodehydrogenative Coupling of Amines to Imines