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

被引：70

作者：

Lee, JY ^{[1
]}

Strasser, P ^{[1
]}

Eiswirth, M ^{[1
]}

Ertl, G ^{[1
]}

机构：

[1] Max Planck Gesell, Fritz Haber Inst, Dept Phys Chem, D-14195 Berlin, Germany

来源：

ELECTROCHIMICA ACTA | 2001年 / 47卷 / 03期

关键词：

electrocatalytic oxidation; formic acid; Bi/Pt electrode; galvanostatic oscillations; hidden negative impedance;

D O I：

10.1016/S0013-4686(01)00744-7

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 [应用化学];

摘要：

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. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：501 / 508

页数：8

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