Morphological Engineering of Zn(II)-Tripyridine Supramolecular Catalysts for CO2 Photoconversion to CO
Binyu Xiao1, Xinyi Tian1, Bohao Wang1
1Hebei Provincial Key Laboratory of Photoelectric Control on Surface and Interface, and College of Science, Hebei University of Science and Technology, Yuhua Road 70, Shijiazhuang 050080, P. R. China.
Abstract:
In this study, we designed and synthesized a novel organic ligand (L3Tpy) using lysine as a bridging unit and terpyridine as the core coordinating group. A Zn-L3Tpy coordination polymer gel (CPG) was subsequently prepared via a facile one-step ultrasonic treatment of a precursor solution containing L3Tpy and ZnCl2 in N,N-dimethylformamide (DMF). Comprehensive characterization using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) revealed that the gel possesses a short-range ordered lamellar stacking structure. Photocatalytic CO2 reduction experiments demonstrated that the Zn-L3Tpy CPG achieved a CO production rate of 24 μmol g-1 h-1, representing a 2-fold enhancement over its nongelated Zn-L3Tpy. Photoelectrochemical analysis further indicated that the short-range ordered lamellar structure facilitated efficient charge mobility, thereby significantly improving the CO2 reduction performance. This work presents a viable structural optimization strategy to enhance the photocatalytic efficiency of metal-organic complexes for sustainable CO2 conversion.
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