摘要
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 s.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*103s-1) of conversion from N-to S-bounded adsorption is nearly double to that of the reverse process(2*103s-1).The difference in kinetics of two processes may be explained through the hard-soft acid-base principle.
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 poten- tial-induced orientation conversion between N- and S-bounded forms is very reversible, and occurs only within 2 ms after poten- tial alternation. However, the rate constant （4×10^3s^-1） of conversion from N- to S-bounded adsorption is nearly double to that of the reverse process （2×10^3s^-1））. The difference in kinetics of two processes may be explained through the hard-soft acid-base prin- ciple.
基金
supported by the National Natural Science Foundation of China (21073152,20833005,20933004,and 21021002)
the Fundamental Research Funds for the Central Universities (2010121021 and2012121019)
Program for New Century Excellent Talents in University(NECT-11-0301)
Outstanding Young Scientific Talents Cultivation Plan of Colleges in Fujian Province (JA10003)
