Au Induced Hydrogen Spillover on Au-TiO 2 for Highly Selective Ammonia Synthesis

The localized surface plasma resonance induced hydrogenation is widely used in the chemical synthesis. However, the hydrogen (H ₂ ) activation on plasma metal and its immigration process is ambiguous on the metal-oxides interface. Here, the theoretical studies show that the plasma metal (Au) on TiO ₂ can generate a strong electric field at metal-oxides interface due to charge enrichment. The ultra-vis spectrums show that this charge enrichment feature promotes the metal-hydrogen bond formation on Au-TiO ₂ . The in-situ Raman shows that the formed Ti-H bond demonstrates the active H* transformation from Au to TiO ₂ , and further activate the NH ₃ synthesis. As a result, the Au-TiO ₂ shows high nitrate conversion of 75% and selectivity of NH ₃ of 82%. This work provides a new approach to disclose the relationship between catalytic performance and charge state on catalysts.