Highly Active IrOx Nanoparticles/Black Si Electrode for Efficient Water Splitting with Conformal TiO2 Interface Engineering

作者：Kan, Miao; Qian, Xufang; Zhang, Taiyang; Yue, Dongting; Zhao, Yixin^*

来源：ACS Sustainable Chemistry and Engineering, 2017, 5(11): 10940-10946.

DOI：10.1021/acssuschemeng.7b02850

• Water splitting
• IrOx nanoparticles
• Nanoporous silicon
• Conformal TiO2

Here we report a highly active electrochemical water splitting electrode fabricated from colloidal IrOx nanoparticles and nanoporous Si stabilized by conformal TiO2. The colloidal amorphous IrOx nanoparticles are highly active for oxygen evolution reaction. However, their application for water splitting has a dilemma that the traditional annealing process could lead to low activities but the nanoparticles based electrode without annealing usually exhibited low stability. This nanostructured water splitting electrode exhibited both the high activities as the colloidal IrOx nanoparticles and comparable stability as a traditional thermal annealing fabricated electrode. The impedance study revealed that conformal TiO2 significantly inhibits the interface oxidation and maintains the high activity of colloidal IrOx nanoparticles catalysts. The conformal TiO2 interface engineering combined with nanocatalysts would be a promising strategy to achieve balanced activities splitting.

• 出版日期2017-11
• 单位上海交通大学