用于能源和环境应用的太阳能活性 ZnO-Eu2O3,Materials Chemistry and Physics

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用于能源和环境应用的太阳能活性 ZnO-Eu2O3
Materials Chemistry and Physics ( IF 4.3 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.matchemphys.2020.123624
S. Balachandran , K. Jeeva Jothi , K. Selvakumar , D.K. Bhat , K. Sathiyanarayanan , M. Swaminathan

摘要 ZnO-Eu2O3 纳米复合材料是通过简单的水热法制备的。这种材料形成了一类潜在的光催化剂，其中 ZnO-Eu2O3 中增加的吸收行为预计与 Eu2O3 和 ZnO 材料的现有特性相结合。使用表面分析（SEM、EDS、HR-TEM、AFM、XRD）和光谱技术（XPS、DRS、PL）表征 ZnO-Eu2O3。从XRD图谱推断，形成了结晶良好的立方Eu2O3和ZnO的六方纤锌矿相。SEM图片显示了具有六方ZnO和立方Eu 2 O 3 的纳米薄片状结构的存在。ZnO-Eu2O3 比 Eu2O3 和 ZnO 具有更高的紫外和可见光吸收。ZnO-Eu2O3 产生更大的甲醇氧化电流，表明其在直接甲醇燃料电池 (DMFC) 中的阳极催化效率。这表明 ZnO-Eu2O3 的电催化活性高于 ZnO。据观察，在 -1.6 V 时，用于析氢反应 (HER) 的 ZnO-Eu2O3 (-103.17 mA cm-2) 的阴极电流密度 (ipc) 是 ZnO (-18.19 mA cm-2) 的五倍以上，并且ZnO-Eu2O3 放出的氢气为 15.6 mL，高于 ZnO (6.8 mL)。这表明 ZnO-Eu2O3 在水分解中具有优异的催化性能。该催化剂在中性 pH 值下在自然阳光下 75 分钟内光降解罗丹明 B (Rh-B) 时表现出 99.2% 的更高催化活性，而 Eu2O3 和 ZnO 同时产生 60% 和 82% 的降解。ZnO-Eu2O3 的降解量子效率大于 ZnO 和 Eu2O3。ZnO-Eu2O3 稳定且可重复使用。这种催化剂的多功能性使其适用于能源和环境应用。

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Solar active ZnO–Eu2O3 for energy and environmental applications

Abstract ZnO–Eu2O3 nanocomposite was fabricated by a simple hydrothermal route. This material forms a potential class of photocatalysts in which the increased absorption behaviour in ZnO–Eu2O3 is expected to couple with the existing characteristics of Eu2O3 and ZnO materials. ZnO–Eu2O3 was characterized using surface analytical (SEM, EDS, HR-TEM, AFM, XRD) and spectroscopic techniques (XPS, DRS,PL). From the XRD patterns, formation of well-crystallized cubic Eu2O3 and hexagonal wurtzite phase of ZnO were inferred. Presence of nanoflake like structure with hexagonal ZnO and cubical Eu2O3 is shown by SEM pictures. ZnO–Eu2O3 possesses higher UV and visible absorption than Eu2O3 and ZnO. ZnO–Eu2O3 produces larger methanol oxidation current indicating its anodic catalytic efficiency in direct methanol fuel cells (DMFCs). This reveals higher electrocatalytic activity of ZnO–Eu2O3 than ZnO. It is observed that at −1.6 V, cathodic current density (ipc) of ZnO–Eu2O3 (−103.17 mA cm−2) for Hydrogen evolution reaction (HER) is more than five times of ZnO (−18.19 mA cm−2) and the hydrogen evolved with ZnO–Eu2O3is 15.6 mL, which is higher than that of ZnO (6.8 mL). This indicates the superior catalytic property of ZnO–Eu2O3 in water splitting. This catalyst exhibited higher catalytic activity of 99.2% in the photodegradation of Rhodamine B (Rh-B) with natural sunlight in 75 min under neutral pH, whereas Eu2O3 and ZnO produced 60 and 82% degradations in the same time. Degradation quantum efficiency by ZnO–Eu2O3 is larger than ZnO and Eu2O3. ZnO–Eu2O3 was stable and reusable. The multifunctionality of this catalyst makes it suitable for energy and environmental applications.

更新日期：2020-12-01

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