Qi Chen,Ling Hu,Yingzhang Shi,Cheng Liu,Yidong Hou,Jinhong Bi,Jimmy C. Yu,Ling Wu
Heterogeneous photocatalytic degradation of antibiotic involves the activation of antibiotic molecules and the photocatalytic oxidation process. However, the simultaneous improvement of these processes is still a challenge. Herein, S-scheme heterojunctions consisted of Cu 2 O nanocluster with defective WO 3 nanosheets were constructed for efficient photocatalytic degradation of levofloxacin (LVX). The typical CNS-5 composite (5 wt% Cu 2 O/WO 3 ) achieves an optimal LVX degradation efficiency of 97.9% within 80 min. The spatial charge separation and enhancement of redox capacity were realized by the formation of S-scheme heterojunction between Cu 2 O and WO 3 . Moreover, their interfacial interaction would lead to the loss of lattice oxygen and the generation of W 5+ sites. It is witnessed that the C–N of piperazine ring and C O of carboxylic acid in LVX are coordinated with W 5+ sites to build the electronic bridge to activate LVX, greatly promoting the further degradation. This work highlights the important role of selective coordination activation cooperated with S-type heterojunctions for the photocatalytic degradation and offers a new view to understand the degradation of antibiotics at molecular level.
Electrocatalytic hydrogen production in neutral electrolytes offers a sustainable pathway toward clean hydrogen, but its development is severely constrained by sluggish reaction kinetics and the lack of high-performance non-noble metal electrocatalysts. Herein, efficient hydrogen production is achieved by integrating heterogeneous structure engineering with iron (Fe) doping, fabricating the Fe-Cu2O/WO3/CF material. Results demonstrate that Fe doping and Cu₂O/WO₃ heterojunction construction exert a synergistic effect in optimizing the catalyst's structural and electronic properties: Fe doping induces lattice distortion, generating abundant oxygen vacancies and coordinatively unsaturated active sites, while the Cu₂O/WO₃ heterojunction accelerates interfacial electron transfer. Electrochemical tests show that Fe-Cu₂O/WO₃/CF exhibits excellent HER activity, requiring overpotentials of 95 mV to achieve current densities of 10 mA·cm⁻² and better long-term stability over 40 hours of continuous operation compared to the undoped counterpart. The significantly enhanced HER performance is comprehensively attributed to the combined contributions of optimized electronic structure, enriched active sites and accelerated charge transfer. Specifically, the cooperative interplay of Cu, Fe, and W with distinct d-band center energies, together with Fe doping-induced electronic modulation, upshifts the d-band center, strengthens the interaction between the catalyst surface and reaction intermediates, and induces the formation of different metal-O bonds for directional electron transfer. Meanwhile, Fe2+ (3d6) in tetrahedral (Cu2O phase) and octahedral (WO3 phase) coordination environments optimizes electron transfer and H* adsorption/desorption behavior via π orbital interactions and electron repulsion with O²-. By exploring the synergistic catalytic activation mechanism of heterojunctions and heteroatom doping, this work provides a theoretical foundation for the rational design of high-efficiency non-noble metal oxide catalysts for neutral water electrolysis.
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