Abstract

In extension to our previous work, studies have been conducted to illustrate the effect of incorporation of Co₂O₃ on photo-conversion efficiency of Mn₂O₃–4TiO₂ composite thin films. Therefore, the bimetallic crystal [Mn₂Ti₄(TFA)₈(THF)₆(OH)₄(O)₂]⋅0.4THF (1) was mixed with Co(OAc)₂ to fabricate Mn₂O₃–Co₂O₃–4TiO₂ (MCT) thin films via aerosol-assisted chemical vapour deposition (AACVD) method. The thin films were properly characterized by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray (EDX), Atomic Force Microscopy (AFM) and UV-Vis spectroscopy to evaluate their crystalline structure, chemical composition, topography, surface roughness and band gaps. Finally, the films were subjected to record their photo-electrochemical response in terms of Linear Scan Voltammetry (LSV) and Electrochemical Impedance Spectroscopy (EIS) using 0.5 M NaOH electrolyte solution. A photocurrent density of 4.91 mA cm^–2 was observed at 0.65 V vs Ag/AgCl/3M KCl with a promising photo conversion efficiency of 2.86%. Furthermore, impedance studies revealed a decrease in charge transfer resistance (R_ct) from 123.79 to 56.43 Ω under illumination conditions.

中文翻译：

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具有提高的光转换效率的三金属（Mn-Co-Ti）氧化物光电阳极

摘要

作为我们之前工作的延伸，已经进行了研究以说明 Co ₂ O ₃的掺入对 Mn ₂ O ₃ –4TiO ₂复合薄膜的光转换效率的影响。因此，将双金属晶体 [Mn ₂ Ti ₄ (TFA) ₈ (THF) ₆ (OH) ₄ (O) ₂ ]⋅0.4THF (1 ) 与 Co(OAc) ₂混合以制备 Mn ₂ O ₃ –Co ₂ O ₃ –4TiO ₂(MCT) 薄膜通过气溶胶辅助化学气相沉积 (AACVD) 方法。通过 X 射线衍射 (XRD)、场发射扫描电子显微镜 (FESEM)、能量色散 X 射线 (EDX)、原子力显微镜 (AFM) 和紫外-可见光谱对薄膜进行了适当的表征，以评估它们的晶体结构，化学成分、形貌、表面粗糙度和带隙。最后，使用 0.5 M NaOH 电解质溶液，根据线性扫描伏安法 (LSV) 和电化学阻抗谱 (EIS) 来记录薄膜的光电化学响应。4.91 mA cm ^{–2 的}光电流密度在 0.65 V vs Ag/AgCl/3M KCl 下观察到有希望的光转换效率为 2.86%。此外，阻抗研究表明，在光照条件下，电荷转移电阻 ( R _ct ) 从 123.79 Ω 降至 56.43 Ω。