Ferroelectric K0.5Na0.5NbO3 catalysts for dye wastewater degradation

Single‐Crystal Ferroelectric‐Based (K,Na)NbO3 Microcuboid/CuO Nanodot Heterostructures with Enhanced Photo–Piezocatalytic Activity

“…Additionally, this k value is the highest among previously reported KNN-based RhB degrading piezocatalysts, photocatalysts, and photo-piezocatalysts (Figure 5e). [20,22,52,59,60] These results imply that the synergistic effect of the heterojunction formation and the strong single-crystal-induced piezoelectric potential accelerated the charge-carrier separation and transfer, which is consistent with the aforementioned electrochemical current density results. To elucidate the long-term stability, cycle tests of piezocatalytic dye degradation were repeated five times using KNN/CuO heterostructure, and each cycle was held for 25 min under ultrasonication (Figure S20, Supporting Information).…”

Facile synthesis of hierarchical CdS nanoflowers for efficient piezocatalytic hydrogen evolution

“…4c shows the curve of H 2 O 2 concentration as it changes over time during the reaction. 69–71 The results demonstrate that the concentration of H 2 O 2 increases with longer of piezoelectric catalysis time. Therefore, in the oxidation reaction of this catalytic system, the holes of CdS initially react with water molecules to generate ˙OH radicals, which then combine to produce H 2 O 2 .…”

Poling‐induced enhancement of piezocatalytic performance of 0.96K0.5Na0.5NbO3‐0.04Bi0.5Na0.5ZrO3 ceramic blocks

“…Poled KNN-based samples are negatively charged in a neutral pH environment. 13 Thus poled samples are more likely to react with cationic RhB and MB molecules, while the reaction with anionic Ab10B species is poor. Generally, the piezocatalytic activities obey the Langmuir-Hinshelwood model, as shown in Equation (3) 30 :…”

“…The electric field is one of the most common external control methods for piezocatalysts in many external energy fields. 13,14 Only when a strong DC electric field is applied to the piezoelectric ceramics, the domains in the ceramics are aligned along the electric field direction, the piezoelectric ceramics will have piezoelectric properties. This process is called artificial poling or single-domain processing.…”