电化学阻抗谱法研究铈改性TiO2 纳米管阵列光电极裂解水产氢动力学

doi:10.6023/A1109195

化学学报 ›› 2012, Vol. 70 ›› Issue (9): 1109-1116.DOI: 10.6023/A1109195 上一篇下一篇

研究论文

电化学阻抗谱法研究铈改性TiO₂ 纳米管阵列光电极裂解水产氢动力学

张胜寒, 梁可心, 檀玉

华北电力大学环境科学与工程学院保定 071003

投稿日期:2011-09-19 修回日期:2011-12-26 发布日期:2012-02-06
通讯作者: 梁可心
基金资助:
中央高校基本科研业务费(No. 11QX79)资助项目.

Dynamics Study on the Cerium and Oxidative Cerium Modified TiO₂ Nanotube Arrays for Hydrogen Production by Water Splitting Using Electrochemical Impedance Spectrum

Zhang Shenghan, Liang Kexin, Tan Yu

School of Environmental Science and Engineering, North China Electric Power University, Baoding 071003

Received:2011-09-19 Revised:2011-12-26 Published:2012-02-06
Supported by:
The project was supported by the Fundamental Research Funds for the Central Universities (No. 11QX79)

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摘要/Abstract

通过阳极氧化法在纯钛板上制备TiO₂ 纳米管阵列电极. 在光电化学电解池阳极中加入供电子物质乙二醇, 显著减小了TiO₂ 纳米管的电荷传递阻抗, 促进了光电催化裂解水产氢反应. 采用阴极电沉积和阳极氧化法制备了单质铈和氧化铈共同改性的TiO₂ 纳米管阵列半导体光阳极, 其平带电位向电负方向移动. 采用电化学阻抗谱法(EIS)对改性后TiO₂ 纳米管阵列在光电催化裂解水产氢中的电子传输性能以及界面性质进行了表征, 确定了各阻抗弧对应的电极过程. 采用合理的等效电路模型计算了电极的电子传输动力学参数. 结果表明, 经铈改性后的TiO₂ 纳米管阵列膜电阻明显减小, 有利于氢气的产生. 探讨了单质铈与氧化铈促进TiO₂ 纳米管阵列电荷传输的作用机理.

关键词: TiO₂ 纳米管, 单质铈, 氧化铈, 电化学阻抗谱, 裂解水, 氢气

TiO₂ nanotube arrays photoelectrodes were prepared by anode oxidation on pure Ti sheet. The donor material glycol (C₂H₆O₂) added in the anode electrolyte significantly reduced the charge transfer impedance of TiO₂ nanotubes to promote the photocatalytic water splitting for hydrogen production. TiO₂ nanotube arrays electrodes were modified by cerium and oxidative cerium with electrochemical deposition and anodic oxidation. The flat band potential moves to the negative potential direction after modification. Electrochemical impedance spectrum (EIS) measurement was used to investigate the electron transfer characteristic in photoelectrodes and the interface characteristic in the photoelectrochemical cell (PEC) for hydrogen production. Arcs of EIS and corresponding electrode processes were discussed. Dynamic parameters of the electrodes were calculated by reasonable electrical equivalent circuit fitting. The results indicate that TiO₂ nanotube arrays electrode modified by cerium and oxidative cerium could largely decrease the electron transfer resistance which contributes to hydrogen production. The mechanism of the cerium and oxidative cerium acting on TiO₂ nanotube arrays to promote charge transfer is discussed.

Key words: TiO₂ nanotube, cerium, oxidative cerium, EIS, water splitting, hydrogen

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张胜寒, 梁可心, 檀玉. 电化学阻抗谱法研究铈改性TiO₂ 纳米管阵列光电极裂解水产氢动力学[J]. 化学学报, 2012, 70(9): 1109-1116.

Zhang Shenghan, Liang Kexin, Tan Yu. Dynamics Study on the Cerium and Oxidative Cerium Modified TiO₂ Nanotube Arrays for Hydrogen Production by Water Splitting Using Electrochemical Impedance Spectrum[J]. Acta Chimica Sinica, 2012, 70(9): 1109-1116.

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电化学阻抗谱法研究铈改性TiO₂ 纳米管阵列光电极裂解水产氢动力学

Dynamics Study on the Cerium and Oxidative Cerium Modified TiO₂ Nanotube Arrays for Hydrogen Production by Water Splitting Using Electrochemical Impedance Spectrum

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