中国物理B ›› 2021, Vol. 30 ›› Issue (5): 58505-058505.doi: 10.1088/1674-1056/abee07

所属专题： SPECIAL TOPIC — Ion beam modification of materials and applications

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Cathodic shift of onset potential on TiO2 nanorod arrays with significantly enhanced visible light photoactivity via nitrogen/cobalt co-implantation

Xianyin Song(宋先印), Hongtao Zhou(周洪涛), and Changzhong Jiang(蒋昌忠)†   

  1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China
  • 收稿日期:2021-01-07 修回日期:2021-02-24 接受日期:2021-03-12 出版日期:2021-05-14 发布日期:2021-05-14
  • 通讯作者: Changzhong Jiang E-mail:czjiang@hnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11875211), the Major Science and Technology Program of Changsha, China (Grant No. kq1902046), and the Fundamental Research Funds for the Central Universities, China.

Cathodic shift of onset potential on TiO2 nanorod arrays with significantly enhanced visible light photoactivity via nitrogen/cobalt co-implantation

Xianyin Song(宋先印), Hongtao Zhou(周洪涛), and Changzhong Jiang(蒋昌忠)†   

  1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China
  • Received:2021-01-07 Revised:2021-02-24 Accepted:2021-03-12 Online:2021-05-14 Published:2021-05-14
  • Contact: Changzhong Jiang E-mail:czjiang@hnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11875211), the Major Science and Technology Program of Changsha, China (Grant No. kq1902046), and the Fundamental Research Funds for the Central Universities, China.

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摘要： Despite anionic doping has been widely implemented to increase the visible light activity of TiO$_{2}$, it often gives rise to a dramatical anodic shift in current onset potential. Herein, we show an effective method to achieve the huge cathodic shift of TiO$_{2}$ photoanode with significantly enhanced visible light photo-electrochemical activity by nitrogen/cobalt co-implantation. The nitrogen/cobalt co-doped TiO$_{2}$ nanorod arrays (N/Co-TiO$_{2}$) exhibit a cathodic shift of 350 mV in onset potential relative to only nitrogen-doped TiO$_{2}$ (N-TiO$_{2}$). Moreover, the visible-light ($\lambda >420 $ nm) photocurrent density of N/Co-TiO$_{2}$ reaches 0.46 mA/cm$^{2}$, far exceeding 0.07 mA/cm$^{2}$ in N-TiO$_{2}$ at 1.23 V $versus$ reversible hydrogen electrode (RHE). Systematic characterization studies demonstrate that the enhanced photo-electrochemical performance can be attributed to the surface synergic sputtering of high-energy nitrogen/cobalt ions.

关键词: ion implantation, TiO2, surface sputtering, photo-electrochemical water splitting

Abstract: Despite anionic doping has been widely implemented to increase the visible light activity of TiO$_{2}$, it often gives rise to a dramatical anodic shift in current onset potential. Herein, we show an effective method to achieve the huge cathodic shift of TiO$_{2}$ photoanode with significantly enhanced visible light photo-electrochemical activity by nitrogen/cobalt co-implantation. The nitrogen/cobalt co-doped TiO$_{2}$ nanorod arrays (N/Co-TiO$_{2}$) exhibit a cathodic shift of 350 mV in onset potential relative to only nitrogen-doped TiO$_{2}$ (N-TiO$_{2}$). Moreover, the visible-light ($\lambda >420 $ nm) photocurrent density of N/Co-TiO$_{2}$ reaches 0.46 mA/cm$^{2}$, far exceeding 0.07 mA/cm$^{2}$ in N-TiO$_{2}$ at 1.23 V $versus$ reversible hydrogen electrode (RHE). Systematic characterization studies demonstrate that the enhanced photo-electrochemical performance can be attributed to the surface synergic sputtering of high-energy nitrogen/cobalt ions.

Key words: ion implantation, TiO2, surface sputtering, photo-electrochemical water splitting

中图分类号:  (Impurity doping, diffusion and ion implantation technology)

  • 85.40.Ry
71.20.Nr (Semiconductor compounds) 68.49.Sf (Ion scattering from surfaces (charge transfer, sputtering, SIMS)) 89.60.-k (Environmental studies)