Ce-doped ZnO photoanode with enhanced photoelectrochemical performance

IF 8.3 2区工程技术 Q1 CHEMISTRY, PHYSICAL International Journal of Hydrogen Energy Pub Date : 2025-03-31 Epub Date: 2025-03-06 DOI:10.1016/j.ijhydene.2025.03.048

M. Sima , N. Preda , C. Negrila , E. Matei , A. Sima , V. Stancu

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Abstract

Photoanodes based Ce-doped ZnO nanorods arrays were prepared by hydrothermal method in order to improve photoelectrochemical efficiency of ZnO photoanodes in water splitting process. Scanning electron microscopy investigation showed ZnO based nanorods with length of around 500 nm and different thicknesses and growth directions. Some morphological changes were noted following the thermal treatment. Energy-dispersive X-ray analysis and X-ray photoelectron spectroscopy measurements proved the presence of cerium species both in bulk and on the surface of ZnO nanorods. A current density of 2.44 mA/cm² at 1.23 V against the reversible hydrogen electrode (0.265 V vs. Ag/AgCl) was obtained for Ce-doped ZnO sample, which is >162% increase over that of ZnO sample. The increased photocurrent value obtained for this sample was correlated with the passivation of surface defects evidenced by photoluminescence study and the increased concentration of Ce³⁺ on the surface. Also, the electrochemical impedance spectroscopy measurements suggested that Ce doping improves the charge transfer in bulk.

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具有增强光电化学性能的ce掺杂ZnO光阳极

为了提高ZnO光阳极在水分解过程中的光电效率，采用水热法制备了基于ce掺杂ZnO光阳极的纳米棒阵列。扫描电镜研究发现，ZnO基纳米棒的长度在500 nm左右，具有不同的厚度和生长方向。热处理后出现了一些形态变化。能量色散x射线分析和x射线光电子能谱测量证明了ZnO纳米棒的本体和表面都存在铈。ce掺杂ZnO样品在1.23 V时对可逆氢电极的电流密度为2.44 mA/cm2（对Ag/AgCl为0.265 V），比ZnO样品提高了162%。该样品光电流值的增加与光致发光研究证明的表面缺陷钝化和表面Ce3+浓度的增加有关。此外，电化学阻抗谱测试结果表明，Ce的掺杂改善了材料的电荷转移。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.