Kun Zhou,Wei Liu,Peifang Wang,Juan Chen,Huinan Che,Bin Liu,Yanhui Ao
Rational design of piezo-assisted photocatalytic systems for simultaneously efficient ultilization of solar and mechanical energy is promising but still challenging. In this work, a novel Bi 4 Ti 3 O 12 @C (BTO@C) Schottky heterojunction with high piezo-assisted photocatalytic performance is rationaly designed, and the degradation reaction rate constant k for RhB reaches 0.092 min −1 in 30 min. Experimental results and density functional theory (DFT) calculations show that C-layer is tightly coated on the surface of BTO. Furthermore, C-O covalent bonds , which act as electron transfer channels, are formed at the interface of BTO and C-layer. Meanwhile, the presence of piezoelectric potential field of BTO@C under piezo-assisted photocatalytic conditions further promotes the transfer of photogenerated electrons from BTO to C-layer, which synergistically contributes to the performance enhancement. This work provides a new idea for the design and development of efficient piezo-assisted photocatalytic materials.
The complex reaction interface and the high reaction barrier for C─C coupling hinder the conversion of CO 2 toward high-value C 2+ products. In this work, thiol is employed to modify facet-controlled Cu nanoparticles, systematically elucidating the tripartite interaction between organic modifiers, active sites, and key intermediates. Theoretical calculations, Kelvin Probe Force Microscope (KPFM), and in situ investigations reveal that the thiol-derived spatial potential field facilitates CO 2 activation and the formation of hydrocarbon intermediates ( * COH). More importantly, the results demonstrate that the C 2+ products of the thiol-modified catalyst are strongly dependent on the crystal planes: the potential field preferentially drives suitable adsorbed * COH to asymmetric * CO- * COH coupling on Cu (100)/(111) interface. Consequently, the C 2+ selectivity of the thiol-modified Cu (100)/(111) interface-rich Cu nanoparticle is intrinsically enhanced, exhibiting high selectivity to C 2+ products with a faradaic efficiency (FE) of 85.44%. Remarkably, the structure achieves a C 2 H 4 FE of 73.79% ± 2.69% with a peak partial current density of 345.75 mA cm − 2 (total current: 1.38 A). Beyond establishing a high-efficiency CO 2 to C 2+ conversion protocol, this study provides mechanistic insights into the selective steering of C─C coupling through tailored surface modifications.
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