Abstract

Layered perovskite-like niobate CsBa₂Nb₃O₁₀ has been synthesized in a pure single-phase state for the first time using both nitrates and carbonates of cesium and barium. Unlike its Ca-, Sr- and Pb-containing analogs, the niobate obtained was shown not to undergo substitution of interlayer alkali cations with protons (protonation) upon acid treatments under various conditions. A potential reason for its chemical inactivity may consist in partial disordering of cesium and barium cations between the interlayer space and perovskite slab, hindering the interlayer ion exchange. Optical bandgap energy of CsBa₂Nb₃O₁₀, being equal to 2.8 eV, potentially allows using visible light (λ < 443 nm) for driving photocatalytic reactions. However, the photocatalytic potential of this niobate towards hydrogen production remains untapped since the activity of the interlayer space in protonation and hydration reactions, as shown earlier, is a fundamentally important factor determining the photocatalytic performance of ion-exchangeable layered perovskite-like oxides.

中文翻译：

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层状钙钛矿型铌酸盐CsBa2Nb3O10的合成、离子交换和光催化性能：与相关Dion-Jacobson相A的比较分析 $${\text{A}}_{2}^{'}$$ Nb3O10 (A = K、Rb、Cs；A' = Ca、Sr、Pb)

摘要

层状钙钛矿型铌酸盐CsBa₂Nb₃ O₁₀ 首次使用铯和钡的硝酸盐和碳酸盐以纯单相状态合成。与含 Ca、Sr 和 Pb 的类似物不同，所获得的铌酸盐在各种条件下进行酸处理后，不会发生层间碱金属阳离子被质子取代（质子化）的情况。其化学不活性的一个潜在原因可能在于层间空间和钙钛矿板之间的铯和钡阳离子部分无序，阻碍了层间离子交换。 CsBa的光学带隙能量₂Nb₃O< a i=11>10等于2.8 eV，可能允许使用可见光（λ<443 nm）来驱动光催化反应。然而，这种铌酸盐对制氢的光催化潜力尚未开发，因为如前所述，质子化和水合反应中层间空间的活性是决定离子交换层状钙钛矿类氧化物光催化性能的根本性重要因素。< /span>