Enhanced Redox properties of amorphous Fe63.3-83.3Co0-20Si4B8P4Cu0.7 alloys via long-term CV cycling

Chaoqun Fu, Jiahui Qu, Zhenhua Dan, Fengxiang Qin, Yan Zhang, Nobuyoshi Hara, Hui Chang, Lian Zhou

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Effect of partial substitution of Fe by Co on the Redox properties and cyclicity of amorphous Fe83.3Si4B8P4Cu0.7 alloy has been investigated in 0.5 M KOH solution by short-term and long-term cyclic voltammetry (CV). Redox performance of amorphous Fe83.3-xCoxSi4B8P4Cu0.7 (x = 0, 1, 4, 10 and 20 at.%) alloys is enhanced by the partial substitution of Fe by Co of 1–20 at.%, and the best chemical composition is considered to be Fe79.3Co4Si4B8P4Cu0.7 on the basis of the highest Redox peak current density after short-term CV cycling. The flake-shaped FeOOH, CoOOH and/or Fe-oxides and Co-oxides form and become more and more with an increasing of the cycle numbers. After 3000 cycles of the long-term CVs, amorphous Fe79.3Co4Si4B8P4Cu0.7 alloy also exhibits the superior and stable Redox properties with two times higher oxidation peak current densities than amorphous Fe83.3Si4B8P4Cu0.7 alloy. Redox peak current densities after long-term CV cycling are enhanced more than 200 times due to the octahedral crystalline Fe3O4, Co3O4 and CoO with a large surface area in comparison to those after the short-term CVs. The substitution of Fe by 4 at.% Co is considered to be the optimal chemical composition for the enhancement of Redox properties and high stability during the long-term CV cycling.

Original languageEnglish
Pages (from-to)349-358
Number of pages10
JournalJournal of Alloys and Compounds
Volume751
DOIs
Publication statusPublished - 2018 Jun 30

Keywords

  • Amorphous Fe-Co-Si-B-P-Cu alloy
  • Cyclic voltammetry cycling
  • Octahedral FeO
  • Redox behavior

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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