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 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.

尽管阴离子掺杂已被广泛实施以增加 TiO ₂的可见光活性，但它通常会引起电流起始电位的显着阳极偏移。在此，我们展示了一种通过氮/钴共植入实现显着增强的可见光光电化学活性的 TiO ₂光阳极的巨大阴极位移的有效方法。氮/钴共掺杂的TiO ₂纳米棒阵列（N/Co-TiO ₂）相对于仅氮掺杂的TiO ₂（N-TiO ₂）表现出350mV的起始电位阴极位移。此外，N/Co-TiO ₂的可见光（λ > 420 nm）光电流密度达到0.46 mA/cm^{如图2所示}，在N-TiO _{2 中，}在1.23 V电压下远超过0.07 mA/cm ²相对于可逆氢电极(RHE)。系统表征研究表明，增强的光电化学性能可归因于高能氮/钴离子的表面协同溅射。