In this study, a new nanocomposite was synthesized using the sol-gel method by immobilizing of -substituted Keggin-type polyoxometalate containing barium (PWBa) on the surface of barium manganese oxide (BaMnO) nanoceramics. The corresponding nanocomposite, denoted as PWBa@BaMnO, was utilized as an effective heterogeneous catalyst in the water splitting for O evolution reaction (OER). The characterization of the PWBa@BaMnO nanocatalyst was performed using various techniques, such as FT-IR, UV–vis, XRD, SEM, and EDX methods. After the successful preparation of the PWBa@BaMnO, its catalytic performance in the OER process was evaluated at different pH values (pH = 7 and 9) using ceric ammonium nitrate (CAN) as an efficient oxidant. The as-prepared nanocomposite exhibited remarkable turnover frequency (TOF), turnover number (TON), and O evolution values of 0.702 , 971.68 , and 0.0014 at pH = 9, respectively. Moreover, the influence of CAN concentration, pH value, and the amounts of KOH and BaCl on the OER process was assessed, and a plausible reaction mechanism was suggested. In this research, the PWBa@BaMnO nanocatalyst has provided valuable insights on the design of other catalysts for water oxidation reactions and beyond.

中文翻译：

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新型纳米复合材料 PW11Ba@BaMnO2 的合成和表征作为水氧化过程的高效纳米催化剂

本研究采用溶胶-凝胶法，将β-取代Keggin型多金属氧酸盐（PWBa）固定在氧化钡锰（BaMnO）纳米陶瓷表面，合成了一种新型纳米复合材料。相应的纳米复合材料，表示为PWBa@BaMnO，被用作水分解析氧反应（OER）中的有效多相催化剂。 PWBa@BaMnO 纳米催化剂的表征采用多种技术进行，例如 FT-IR、UV-vis、XRD、SEM 和 EDX 方法。成功制备PWBa@BaMnO后，使用硝酸高铈铵（CAN）作为高效氧化剂，在不同pH值（pH = 7和9）下评估其在OER过程中的催化性能。所制备的纳米复合材料在 pH = 9 时表现出显着的转换频率 (TOF)、转换数 (TON) 和 O 析出值，分别为 0.702、971.68 和 0.0014。此外，还评估了 CAN 浓度、pH 值以及 KOH 和 BaCl 的量对 OER 过程的影响，并提出了合理的反应机制。在这项研究中，PWBa@BaMnO 纳米催化剂为水氧化反应及其他反应的其他催化剂的设计提供了宝贵的见解。