Kinetics of thiocyanate orientation conversion on Pt surface studied by in situ step-scan time-resolved microscope FTIR spectroscopy
2013
Zhou, Zhiyou | Tian, Na | Sun, ShiGang
Fast surface dynamic processes of thiocyanate adsorbed on a nanostructured Pt microelectrode were studied by in situ step-scan time-resolved microscope FTIR spectroscopy (in situ SSTR-MFTIRS) at a time resolution of 100 μs. It was found that SCN⁻ adsorbs preferentially on Pt surface through N atom at low potential, while through S atom at high potential. The potential-induced orientation conversion between N- and S-bounded forms is very reversible, and occurs only within 2 ms after potential alternation. However, the rate constant (4×10³ s⁻¹) of conversion from N- to S-bounded adsorption is nearly double to that of the reverse process (2×10³ s⁻¹). The difference in kinetics of two processes may be explained through the hard-soft acid-base principle.
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