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Special Issue:
SPECIAL TOPIC — Ion beam modification of materials and applications
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| 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)† |
| College of Materials Science and Engineering, Hunan University, Changsha 410082, China |
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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.
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Received: 07 January 2021
Revised: 24 February 2021
Accepted manuscript online: 12 March 2021
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PACS:
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85.40.Ry
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(Impurity doping, diffusion and ion implantation technology)
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71.20.Nr
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(Semiconductor compounds)
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68.49.Sf
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(Ion scattering from surfaces (charge transfer, sputtering, SIMS))
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89.60.-k
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(Environmental studies)
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| Fund: 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. |
Corresponding Authors:
Changzhong Jiang
E-mail: czjiang@hnu.edu.cn
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Cite this article:
Xianyin Song(宋先印), Hongtao Zhou(周洪涛), and Changzhong Jiang(蒋昌忠) Cathodic shift of onset potential on TiO2 nanorod arrays with significantly enhanced visible light photoactivity via nitrogen/cobalt co-implantation 2021 Chin. Phys. B 30 058505
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