Effect of the polyethyleneimine-cobalt complex on reduction current of oxygen

Baoqing Shentu, Zhixue Weng, Hiroyuki Nishide

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The reversible oxygen-binding properties of the polyethyleneimine-cobalt (PEI-Co) complex and the effect of the PEI-Co complex on the reduction current of oxygen were studied. The color of the PEI-Co complex in the electrolyte solution changed on exposure to oxygen atmosphere, which was monitored by UV-visible absorption spectrometry. The UV-visible absorption spectra of the PEI-Co complex displayed a new adsorption band at 310 nm, with an isosbestic point at 280 nm. The spectral change was attributed to the reversible oxygen-adduct formation of the PEI-Co complex even in the electrolyte solution. The oxygen-binding equilibrium curve of the PEI-Co complex obeyed a Langmuir isotherm, to give the high oxygen-binding affinity (p50 = 0.667 kPa). And the apparent dissociation rate constant of oxygen from the PEI-Co complex (kd = 1.1 × 105 s-1) was also high. The aqueous solution of the PEI-Co complex that had rapid and reversible oxygen-binding properties functioned as an oxygen-enriching medium for oxygen electrode to enhance the diffusion-controlled current for the oxygen reduction. Based on the rapid release of oxygen from the PEI-Co complex, a high current was obtained for the reduction of oxygen in the presence of the PEI-Co complex, and the current increased with the increase of the concentration of the PEI-Co complex and the oxygen concentration in the atmosphere. The reduction current reached a saturated value near [ethyleneimine unit]/[Co] = 5, which suggested the structure of a six-coordinate μ-dioxo dinuclear complex [N 5CoIII-O2-CoIIIN5]. A new type of oxygen-diffusion electrode for metal/air batteries and fuel cells is proposed using the oxygen-enriching material immobilized at the electrode surface.

Original languageEnglish
Pages (from-to)859-863
Number of pages5
JournalActa Polymerica Sinica
Issue number6
Publication statusPublished - 2004 Dec

Fingerprint

Polyethyleneimine
Cobalt
Oxygen
Electrolytes
Electrodes
Fuel cells

Keywords

  • Oxygen electrode
  • Polyethyleneimine-cobalt complex
  • Reduction current
  • Reversible oxygen-binding

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

Effect of the polyethyleneimine-cobalt complex on reduction current of oxygen. / Shentu, Baoqing; Weng, Zhixue; Nishide, Hiroyuki.

In: Acta Polymerica Sinica, No. 6, 12.2004, p. 859-863.

Research output: Contribution to journalArticle

@article{467c337a5ea346b19169c81d51e216af,
title = "Effect of the polyethyleneimine-cobalt complex on reduction current of oxygen",
abstract = "The reversible oxygen-binding properties of the polyethyleneimine-cobalt (PEI-Co) complex and the effect of the PEI-Co complex on the reduction current of oxygen were studied. The color of the PEI-Co complex in the electrolyte solution changed on exposure to oxygen atmosphere, which was monitored by UV-visible absorption spectrometry. The UV-visible absorption spectra of the PEI-Co complex displayed a new adsorption band at 310 nm, with an isosbestic point at 280 nm. The spectral change was attributed to the reversible oxygen-adduct formation of the PEI-Co complex even in the electrolyte solution. The oxygen-binding equilibrium curve of the PEI-Co complex obeyed a Langmuir isotherm, to give the high oxygen-binding affinity (p50 = 0.667 kPa). And the apparent dissociation rate constant of oxygen from the PEI-Co complex (kd = 1.1 × 105 s-1) was also high. The aqueous solution of the PEI-Co complex that had rapid and reversible oxygen-binding properties functioned as an oxygen-enriching medium for oxygen electrode to enhance the diffusion-controlled current for the oxygen reduction. Based on the rapid release of oxygen from the PEI-Co complex, a high current was obtained for the reduction of oxygen in the presence of the PEI-Co complex, and the current increased with the increase of the concentration of the PEI-Co complex and the oxygen concentration in the atmosphere. The reduction current reached a saturated value near [ethyleneimine unit]/[Co] = 5, which suggested the structure of a six-coordinate μ-dioxo dinuclear complex [N 5CoIII-O2-CoIIIN5]. A new type of oxygen-diffusion electrode for metal/air batteries and fuel cells is proposed using the oxygen-enriching material immobilized at the electrode surface.",
keywords = "Oxygen electrode, Polyethyleneimine-cobalt complex, Reduction current, Reversible oxygen-binding",
author = "Baoqing Shentu and Zhixue Weng and Hiroyuki Nishide",
year = "2004",
month = "12",
language = "English",
pages = "859--863",
journal = "Acta Polymerica Sinica",
issn = "1000-3304",
publisher = "Science Press",
number = "6",

}

TY - JOUR

T1 - Effect of the polyethyleneimine-cobalt complex on reduction current of oxygen

AU - Shentu, Baoqing

AU - Weng, Zhixue

AU - Nishide, Hiroyuki

PY - 2004/12

Y1 - 2004/12

N2 - The reversible oxygen-binding properties of the polyethyleneimine-cobalt (PEI-Co) complex and the effect of the PEI-Co complex on the reduction current of oxygen were studied. The color of the PEI-Co complex in the electrolyte solution changed on exposure to oxygen atmosphere, which was monitored by UV-visible absorption spectrometry. The UV-visible absorption spectra of the PEI-Co complex displayed a new adsorption band at 310 nm, with an isosbestic point at 280 nm. The spectral change was attributed to the reversible oxygen-adduct formation of the PEI-Co complex even in the electrolyte solution. The oxygen-binding equilibrium curve of the PEI-Co complex obeyed a Langmuir isotherm, to give the high oxygen-binding affinity (p50 = 0.667 kPa). And the apparent dissociation rate constant of oxygen from the PEI-Co complex (kd = 1.1 × 105 s-1) was also high. The aqueous solution of the PEI-Co complex that had rapid and reversible oxygen-binding properties functioned as an oxygen-enriching medium for oxygen electrode to enhance the diffusion-controlled current for the oxygen reduction. Based on the rapid release of oxygen from the PEI-Co complex, a high current was obtained for the reduction of oxygen in the presence of the PEI-Co complex, and the current increased with the increase of the concentration of the PEI-Co complex and the oxygen concentration in the atmosphere. The reduction current reached a saturated value near [ethyleneimine unit]/[Co] = 5, which suggested the structure of a six-coordinate μ-dioxo dinuclear complex [N 5CoIII-O2-CoIIIN5]. A new type of oxygen-diffusion electrode for metal/air batteries and fuel cells is proposed using the oxygen-enriching material immobilized at the electrode surface.

AB - The reversible oxygen-binding properties of the polyethyleneimine-cobalt (PEI-Co) complex and the effect of the PEI-Co complex on the reduction current of oxygen were studied. The color of the PEI-Co complex in the electrolyte solution changed on exposure to oxygen atmosphere, which was monitored by UV-visible absorption spectrometry. The UV-visible absorption spectra of the PEI-Co complex displayed a new adsorption band at 310 nm, with an isosbestic point at 280 nm. The spectral change was attributed to the reversible oxygen-adduct formation of the PEI-Co complex even in the electrolyte solution. The oxygen-binding equilibrium curve of the PEI-Co complex obeyed a Langmuir isotherm, to give the high oxygen-binding affinity (p50 = 0.667 kPa). And the apparent dissociation rate constant of oxygen from the PEI-Co complex (kd = 1.1 × 105 s-1) was also high. The aqueous solution of the PEI-Co complex that had rapid and reversible oxygen-binding properties functioned as an oxygen-enriching medium for oxygen electrode to enhance the diffusion-controlled current for the oxygen reduction. Based on the rapid release of oxygen from the PEI-Co complex, a high current was obtained for the reduction of oxygen in the presence of the PEI-Co complex, and the current increased with the increase of the concentration of the PEI-Co complex and the oxygen concentration in the atmosphere. The reduction current reached a saturated value near [ethyleneimine unit]/[Co] = 5, which suggested the structure of a six-coordinate μ-dioxo dinuclear complex [N 5CoIII-O2-CoIIIN5]. A new type of oxygen-diffusion electrode for metal/air batteries and fuel cells is proposed using the oxygen-enriching material immobilized at the electrode surface.

KW - Oxygen electrode

KW - Polyethyleneimine-cobalt complex

KW - Reduction current

KW - Reversible oxygen-binding

UR - http://www.scopus.com/inward/record.url?scp=14944369597&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=14944369597&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:14944369597

SP - 859

EP - 863

JO - Acta Polymerica Sinica

JF - Acta Polymerica Sinica

SN - 1000-3304

IS - 6

ER -