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Structural, opto-electronic and photoelectrochemical properties of tin doped hematite nanoparticles for water splitting
Materials Science in Semiconductor Processing ( IF 4.1 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.mssp.2019.104873
Satirtha K. Sarma , Ratan Mohan , Anupam Shukla

Abstract For application in photoelectrochemical water splitting, pristine and Sn doped (1%, 3% and 5%) hematite nanoparticles were prepared hydrothermally via a two step heating process. XRD results showed that the products match the rhombohedral crystal system. The peak broadening of hematite nanoparticles due to small crystallite size and strain were analyzed by Scherrer's equation and Williamson Hall plot method respectively. A decrease in crystallite size and an increase in lattice strain is observed with dopant addition. Structural change from nanorods to nanocorals is seen for the Sn doped hematite products. Selected Area Diffraction patterns reveal crystallinity of both the doped and undoped powders. Sn 3d XPS peak analysis reveals that Sn has been doped into the hematite lattice. Linear Sweep Voltammetry and Electrochemical Impedance Spectroscopy analysis confirm that 1% Sn doped hematite has the highest photocurrent density (3 mA/cm2 at 1 V vs. Ag/AgCl) and least charge transfer resistance among the doped products. UV-VIS, Photoluminescence and Mott-Schottky analysis further show that optimum optical and electrical properties are observed for hematite doped with 1% Sn.

中文翻译:

用于分解水的锡掺杂赤铁矿纳米颗粒的结构、光电和光电化学性能

摘要 为了应用于光电化学水分解,通过两步加热过程水热制备了原始和 Sn 掺杂(1%、3% 和 5%)的赤铁矿纳米粒子。XRD结果表明产物符合菱面体晶系。分别通过谢勒方程和威廉姆森霍尔图法分析了赤铁矿纳米颗粒由于小晶粒尺寸和应变而导致的峰展宽。随着掺杂剂的加入,观察到微晶尺寸的减小和晶格应变的增加。对于掺杂 Sn 的赤铁矿产品,可以看到从纳米棒到纳米珊瑚的结构变化。选定区域衍射图显示掺杂和未掺杂粉末的结晶度。Sn 3d XPS 峰分析表明,Sn 已掺杂到赤铁矿晶格中。线性扫描伏安法和电化学阻抗谱分析证实,掺杂 1% Sn 的赤铁矿具有最高的光电流密度(1 V 时为 3 mA/cm2 与 Ag/AgCl 相比),并且在掺杂产品中具有最低的电荷转移电阻。UV-VIS、光致发光和莫特-肖特基分析进一步表明,掺杂 1% Sn 的赤铁矿观察到了最佳的光学和电学特性。
更新日期:2020-03-01
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