探索用于光催化分解 N2O 的铋基材料

IF 3.2 Q2 CHEMISTRY, PHYSICAL Energy advances Pub Date : 2024-06-21 DOI:10.1039/D4YA00240G
Shalu Atri, Sitharaman Uma, Rajamani Nagarajan, Maros Gregor, Tomas Roch, Miroslava Filip Edelmannova, Martin Reli, Kamila Koci, Martin Motola and Olivier Monfort
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引用次数: 0

摘要

这项工作的重点是研究三种不同的铋基材料,即 CaBi2O2(CO3)2(CBOC)、Ca4Bi6O13(CBO)和 Bi2Ce2O7(BCO)作为光催化剂还原 N2O 的情况。这项研究强调了铋离子作为光催化剂的有效性,无论其存在于具有自我调节电子和形态特性的不同结构中。本研究采用湿化学方法合成了单相 CBOC、CBO 和 BCO 样品,它们呈现出明显的形态特征,如板状、哑铃状和不规则状结晶。从紫外-可见漫反射光谱(DRS)数据来看,CBO 的光带隙为 2.52 eV,低于 CBOC(3.95 eV),而 CBOC 是由 CBO 合成的。BCO 的光带隙最低,为 2.16 eV。根据 CBO > CBOC > BCO 的趋势,CBO 显示出最高的光电流生成和最低的功函数测量值。CBO 和 BCO 中的氧空位在光催化分解 N2O 的过程中发挥了关键作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Exploration of bismuth-based materials for photocatalytic decomposition of N2O†

This work is focused on the investigation of three different Bi-based materials, i.e., CaBi2O2(CO3)2 (CBOC), Ca4Bi6O13 (CBO), and Bi2Ce2O7 (BCO), as photocatalysts in N2O reduction. This study has emphasized the effectiveness of the bismuth ion, irrespective of its presence in different structures with self-regulating electronic and morphological properties, when employed as a photocatalyst. Monophasic CBOC, CBO, and BCO samples have been synthesized by wet-chemical methods, and they exhibit distinct morphological features such as plate-like, dumbbell-shaped, and irregularly shaped crystallites. From the UV-visible diffuse reflectance spectroscopy (DRS) data, CBO exhibits a lower optical band gap of 2.52 eV compared to CBOC (3.95 eV), which CBO is synthesized from. BCO shows the lowest optical band gap of 2.16 eV. CBO exhibits the highest photocurrent generation and the lowest value in work function measurements, following the trend as CBO > CBOC > BCO. The efficiency of the Bi-based materials in photocatalytic decomposition of N2O also follows a similar trend as observed in the photocurrent measurements, wherein the CBO sample exhibits a maximum of 10.4% decomposition of N2O under UV-A in 24 h. Oxygen vacancies in CBO and BCO have been reasoned to play a crucial role in the photocatalytic decomposition of N2O.

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