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

• 作者: Xianyin Song Hongtao Zhou Changzhong Jiang
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: SPECIAL TOPIC — Ion beam modification of materials and applications
• 页码范围: 128-134
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/abee07

摘要

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 (λ ＞ 420 nm) photocurrent density of N/Co-TiO2 reaches 0.46 mA/cm2,far exceeding 0.07 mA/cm2 in N-TiO2 at 1.23 V versus reversible hydrogen elec-trode (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.