Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (01): 56-60.doi: 10.3866/PKU.WHXB19950111

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Kinetics and Time Resolved FTIR Spectroscopic Characters of Dissociative Adsorption of HCOOH on Pt Electrode

Sun Shi-Gang, Lu Guo-Qiang   

  1. State Key Laboratory for Physical Chemistry of the Solid Surface,Department of Chemistry,Institute of Physical Chemistry,Xiamen University,Xiamen 361005
  • Received:1993-12-20 Revised:1994-05-04 Published:1995-01-15
  • Contact: Sun Shi-Gang

Abstract:

The surface molecular process of dissociative adsorption of formic acid on Pt electrode has been investigated by using potential step technique and in situ time resolved FTIR spectroscopy. The results demonstrated that the rate of dissociative adsorption of HCOOH on Pt electrode depends on electrode potentials, yielding a volcanic relationship with the maximum located near -0.06V vs SCE. From the variation of the quantity of products of the dissociative adsorption, detected by electrochemical transient technique, with different adsorption time the initial rate (vi) of this surface reaction has been evaluated, the maximum of vi was evaluated at 9.33×10-11mol•cm-2•s-1 for a solution containing 10-3mol•L-1HCOOH and at -0.06V. The in situ time resolved FTIR spectroscopic results confirmed both the volcanic variation of vi with Ead and the kinetic properties of the dissociative adsorption of HCOOH on Pt electrode.

Key words: Formic acid, Dissociative adsorption, Surface reaction kinetics, Potential step technique, Time resolved infrared spectroscopy