Journal
CHINESE PHYSICS B
Volume 30, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/abee07
Keywords
ion implantation; TiO2; surface sputtering; photo-electrochemical water splitting
Categories
Funding
- National Natural Science Foundation of China [11875211]
- Major Science and Technology Program of Changsha, China [kq1902046]
- Fundamental Research Funds for the Central Universities, China
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By co-implanting nitrogen and cobalt, a significant cathodic shift of TiO2 photoanode was achieved, leading to enhanced visible light photo-electrochemical activity. The nitrogen/cobalt co-doped TiO2 nanorod arrays showed improved performance with a much higher visible-light photocurrent density.
Despite anionic doping has been widely implemented to increase the visible light activity of TiO2, 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 TiO2 photoanode with significantly enhanced visible light photo-electrochemical activity by nitrogen/cobalt co-implantation. The nitrogen/cobalt co-doped TiO2 nanorod arrays (N/Co-TiO2) exhibit a cathodic shift of 350 mV in onset potential relative to only nitrogen-doped TiO2 (N-TiO2). Moreover, the visible-light (lambda > 420 nm) photocurrent density of N/Co-TiO2 reaches 0.46 mA/cm(2), far exceeding 0.07 mA/cm(2) in N-TiO2 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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