Photocatalytic activity of Al2O3:Eu2+ and Al2O3:Ce3+ coatings formed by plasma electrolytic oxidation of aluminum

IF 4.9 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY Journal of Physics and Chemistry of Solids Pub Date : 2025-08-01 Epub Date: 2025-03-18 DOI:10.1016/j.jpcs.2025.112709

Stevan Stojadinović , Nenad Radić

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Abstract

The potential of Al₂O₃:Eu²⁺ and Al₂O₃:Ce³⁺ coatings as photocatalysts in decomposition of methyl orange (MO) under UV irradiation was investigated. These coatings were formed on aluminum substrate by plasma electrolytic oxidation (PEO) in supporting electrolyte (SE, boric acid + borax) containing Eu₂O₃ and CeO₂ particles, respectively. The photocatalytic activity (PA) was investigated using MO decomposition (10 cm³ of 8 mg/L). Al₂O₃ is not commonly used as a photocatalyst due to its wide band gap and low PA, but the PA of Al₂O₃ coatings formed by PEO in SE is around 50 % after 8 h of irradiation. A high concentration of oxygen vacancies formed in the Al₂O₃ during PEO can be associated with this PA. The PA of Al₂O₃:Eu²⁺ and Al₂O₃:Ce³⁺ is significantly higher than that of pure Al₂O₃. The main reason for this is the increase in oxygen vacancies concentration caused by the incorporation of Eu²⁺ and Ce³⁺ into the Al₂O₃ crystal structure. The PA of Al₂O₃:Eu²⁺ and Al₂O₃:Ce³⁺ formed in SE with addition 4 g/L Eu₂O₃ and 4 g/L CeO₂ particles, respectively, is around 80 % after 8 h of irradiation. Eu²⁺ and Ce³⁺ act both as reducing agents for adsorbed oxygen species and as electron traps through the conversion of Eu²⁺/Eu³⁺ and Ce³⁺/Ce⁴⁺.

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铝等离子体电解氧化形成的Al2O3:Eu2+和Al2O3:Ce3+涂层的光催化活性

研究了Al2O3:Eu2+和Al2O3:Ce3+涂层在紫外光照射下作为甲基橙（MO）分解光催化剂的潜力。这些涂层分别在含有Eu2O3和CeO2颗粒的支撑电解质（SE，硼酸+硼砂）中通过等离子体电解氧化（PEO）在铝基体上形成。采用MO分解（10 cm3 / 8 mg/L）考察其光催化活性（PA）。Al2O3的禁带较宽，PA较低，不常用作光催化剂，但PEO在SE中辐照8 h后形成的Al2O3涂层PA约为50%。在PEO过程中，Al2O3中形成的高浓度氧空位可能与这种PA有关。Al2O3:Eu2+和Al2O3:Ce3+的PA明显高于纯Al2O3。这主要是由于Eu2+和Ce3+掺入Al2O3晶体结构导致氧空位浓度增加所致。在SE中加入4 g/L的Eu2O3和4 g/L的CeO2，经过8 h的辐照后，形成的Al2O3:Eu2+和Al2O3:Ce3+的PA分别在80%左右。Eu2+和Ce3+既作为吸附氧的还原剂，又通过Eu2+/Eu3+和Ce3+/Ce4+的转化成为电子陷阱。

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来源期刊

Journal of Physics and Chemistry of Solids 工程技术-化学综合

CiteScore

7.80

自引率

2.50%

发文量

605

审稿时长

40 days

期刊介绍： The Journal of Physics and Chemistry of Solids is a well-established international medium for publication of archival research in condensed matter and materials sciences. Areas of interest broadly include experimental and theoretical research on electronic, magnetic, spectroscopic and structural properties as well as the statistical mechanics and thermodynamics of materials. The focus is on gaining physical and chemical insight into the properties and potential applications of condensed matter systems. Within the broad scope of the journal, beyond regular contributions, the editors have identified submissions in the following areas of physics and chemistry of solids to be of special current interest to the journal: Low-dimensional systems Exotic states of quantum electron matter including topological phases Energy conversion and storage Interfaces, nanoparticles and catalysts.