Synthesis, characterization, electrochemical impedance spectroscopy performance and photodegradation of methylene blue: Mesoporous PEG/TiO2 by sol-gel electrospinning

IF 2.8 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER

Physica B-condensed Matter Pub Date : 2024-10-13 DOI:10.1016/j.physb.2024.416627

Dieketseng Tsotetsi , Tumelo Seadira , Pontsho Mbule , Mokhotjwa Dhlamini

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Abstract

Sol-gel and electrospinning methods successfully prepared porous TiO₂ fibers. The samples were calcined at temperatures of 450 °C and 550 °C and characterized using different techniques. XRD analysis also revealed crystalline anatase and rutile phases of mp-TiO₂ observed at calcining temperatures of 450 °C and 550 °C, whereas as-prepared showed an amorphous-like structure. Relatively higher surface area and photocatalytic efficiency were increased with a decrease in crystallite size. All samples absorb UV region. The Rs value of TiO₂ calcined at 550 °C was 16.6 Ω, which is much lower than those of the 450 °C calcined TiO₂ powder electrode (52.7 Ω) and as-prepared TiO₂ electrode (95.3 Ω). In addition, the Rp resistance of TiO₂ calcined at 550 °C electrode (5.85 kΩ) was also lower than those of 450 °C calcined TiO₂ powder (39.0 kΩ) and as-prepared TiO₂ electrode (68.9 kΩ), revealing better electronic and ionic conduction of TiO₂ calcined at 550 °C electrode.

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亚甲基蓝的合成、表征、电化学阻抗谱性能和光降解：溶胶-凝胶电纺丝法制备介孔 PEG/TiO2

溶胶凝胶法和电纺丝法成功制备了多孔二氧化钛纤维。样品在 450 ℃ 和 550 ℃ 的温度下煅烧，并采用不同的技术进行表征。XRD 分析还显示，在 450 ℃ 和 550 ℃ 的煅烧温度下，mp-TiO2 可观察到锐钛矿相和金红石相结晶，而制备的样品则显示出无定形结构。随着晶体尺寸的减小，比表面积和光催化效率也相对增大。所有样品都能吸收紫外线。550 °C 煅烧的 TiO2 的 Rs 值为 16.6 Ω，远低于 450 °C 煅烧的 TiO2 粉末电极（52.7 Ω）和未制备的 TiO2 电极（95.3 Ω）。此外，550 ℃煅烧的二氧化钛电极的 Rp 电阻（5.85 kΩ）也低于 450 ℃煅烧的二氧化钛粉末电极（39.0 kΩ）和制备的二氧化钛电极（68.9 kΩ），这表明 550 ℃煅烧的二氧化钛电极具有更好的电子和离子传导性。

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来源期刊

Physica B-condensed Matter 物理-物理：凝聚态物理

CiteScore

4.90

自引率

7.10%

发文量

703

审稿时长

44 days

期刊介绍： Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces