English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
Add to Basket
  Local TagsRelease HistoryDetailsSummary

Released
Journal Article

On the origin of oscillations in the electrocatalytic oxidation of HCOOH on a Pt electrode modified by Bi deposition

MPS-Authors
/persons/resource/persons21788

Lee,  Jaeyoung
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons22145

Strasser,  Peter
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21488

Eiswirth,  Markus
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21498

Ertl,  Gerhard
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

External Resource
No external resources are shared
Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Lee, J., Strasser, P., Eiswirth, M., & Ertl, G. (2001). On the origin of oscillations in the electrocatalytic oxidation of HCOOH on a Pt electrode modified by Bi deposition. Electrochimica Acta, 47(3), 501-508. doi:10.1016/S0013-4686(01)00744-7.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-1741-9
Abstract
We report experimental observations on the temporal dynamics in the electrocatalytic oxidation of formic acid (HCOOH) on a polycrystalline Pt electrode modified by deposition of bismuth. Bismuth modification significantly enhanced the current density of HCOOH oxidation, since it suppressed the poisoning branch and increased the apparent direct oxidation rate. Impedance spectroscopy and the galvanostatic scan in HCOOH oxidation on Bi/Pt exhibited a hidden negative differential resistance and a Hopf bifurcation. The electrocatalytic oxidation of HCOOH on Bi/Pt spontaneously underwent transitions from homogeneous catalytic activity to spatiotemporally inhomogeneous distributions of the interfacial electrode potential, in the form of traveling pulses of the interfacial potential.