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<p>K<sub>1−<i>x</i></sub>Na<sub><i>x</i></sub>NbO<sub>3</sub> (KNN) powders were prepared using a molten salt method, and their piezo-catalysis performances were improved by controlling their composition and introducing defects. KNN powders exhibit a short rod shape and are composed of stacked cubic particles. By adjusting the K/Na ratio in the reactant, the K/Na ratio in the actual composition of KNN approaches 1:1, which is near the morphotropic phase boundary of KNN. Samples with this composition exhibit the optimum piezo-catalysis performance on degradation of RhB solution, with a degradation efficiency constant (K) value of 83.4 × 10<sup>–3</sup>/min. Furthermore, the effects of oxygen vacancies on piezo-catalytic performance are studied. K value of the sample annealed in N<sub>2</sub> has doubled, reaching a maximum of 162.6 × 10<sup>–3</sup>/min. Thus, our work provides an effective approach to improve piezo-catalysis performances by phase boundary and defect engineering.</p>

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Controlled A-site stoichiometric ratio and enhanced piezo-catalysis of K1−xNaxNbO3 powders prepared using a molten salt method

  • 期刊论文

  • 发表日期：

    2025年1月23日

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  • Xin Wang,
  • Tongfei Yang,
  • Min Xiao,
  • Qichao Wu,
  • Pengrong Ren

摘要

K1−xNaxNbO3 (KNN) powders were prepared using a molten salt method, and their piezo-catalysis performances were improved by controlling their composition and introducing defects. KNN powders exhibit a short rod shape and are composed of stacked cubic particles. By adjusting the K/Na ratio in the reactant, the K/Na ratio in the actual composition of KNN approaches 1:1, which is near the morphotropic phase boundary of KNN. Samples with this composition exhibit the optimum piezo-catalysis performance on degradation of RhB solution, with a degradation efficiency constant (K) value of 83.4 × 10–3/min. Furthermore, the effects of oxygen vacancies on piezo-catalytic performance are studied. K value of the sample annealed in N2 has doubled, reaching a maximum of 162.6 × 10–3/min. Thus, our work provides an effective approach to improve piezo-catalysis performances by phase boundary and defect engineering.