u表面电化学氮还原的谱学研究

ttenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) and differential electrochemical mass spectrometry (DEMS) were used for in situ monitoring the electrochemical nitrogen reduction reaction (NRR) process on Au electrode.The results showed that in N2-saturated electrolyte solution, the characteristic absorption peaks ofkey intermediate species located at 2958 cm-1 (N-H stretching vibration), 1480 cm-1 (H-N-H bending vibration), 1330 cm-1 (-NH2 symmetrical vibration), and 1110 cm-1 (N-N stretching vibration), and the nitrogen-containing species were confirmed to bethe products of nitrogen reductionin combination with Ar atmosphere control experiments.The signal of m/z=31 (NH-NH2) was detected by differential electrochemical mass spectrometry, this finding provides the direct experimental evidence that nitrogen reduction on Au electrode follows an associative alternationmechanism. This study has successfully realized the dynamic analysis of the NRR mechanism by combining the electrochemical in situ spectroscopy and mass spectrometry techniques.