Oxygen consumption upon electrochemically polarised zinc

S. Thomas; I. S. Cole; Y. Gonzalez-Garcia; M. Chen; M. Musameh; J. M.C. Mol; H. Terryn; N. Birbilis

doi:10.1007/s10800-014-0684-0

Oxygen consumption upon electrochemically polarised zinc

S. Thomas^*
, I. S. Cole
, Y. Gonzalez-Garcia
, M. Chen
, M. Musameh
, J. M.C. Mol
, H. Terryn
, N. Birbilis

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

A Pt microelectrode was used to measure the oxygen consumption by redox reduction (ORR) on electrochemically polarised zinc in the redox competition mode. Zinc was polarised in the active and passive state, using a pH 7 and pH 13 solution, respectively. At pH 7, the oxygen concentration measured at a distance of 50 μm from the zinc surface, using the Pt microelectrode, is 15-60 % of the bulk oxygen concentration. Therefore, correspondingly, the oxygen consumption by zinc (due to ORR) is 40-85 % of the bulk oxygen concentration. At pH 13, where zinc undergoes passivation, the oxygen consumption by zinc is 70-80 % of the bulk oxygen concentration. The ORR rate on the surface of zinc passive films (ZnO/Zn(OH)₂) is thus significant when compared to that on bare/actively corroding zinc. The influence of the electrode kinetics of zinc corrosion, on oxygen diffusion towards the metal surface has been investigated in this study.

Original language	English
Pages (from-to)	747-757
Number of pages	11
Journal	Journal of Applied Electrochemistry
Volume	44
Issue number	6
DOIs	https://doi.org/10.1007/s10800-014-0684-0
Publication status	Published - Jun 2014
Externally published	Yes

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@article{eee0ca10b4bf49598cf90c9c0beb3cf3,

title = "Oxygen consumption upon electrochemically polarised zinc",

abstract = "A Pt microelectrode was used to measure the oxygen consumption by redox reduction (ORR) on electrochemically polarised zinc in the redox competition mode. Zinc was polarised in the active and passive state, using a pH 7 and pH 13 solution, respectively. At pH 7, the oxygen concentration measured at a distance of 50 μm from the zinc surface, using the Pt microelectrode, is 15-60 \% of the bulk oxygen concentration. Therefore, correspondingly, the oxygen consumption by zinc (due to ORR) is 40-85 \% of the bulk oxygen concentration. At pH 13, where zinc undergoes passivation, the oxygen consumption by zinc is 70-80 \% of the bulk oxygen concentration. The ORR rate on the surface of zinc passive films (ZnO/Zn(OH)2) is thus significant when compared to that on bare/actively corroding zinc. The influence of the electrode kinetics of zinc corrosion, on oxygen diffusion towards the metal surface has been investigated in this study.",

keywords = "Oxygen, Oxygen reduction reaction, Passivity, SECM, Zinc",

author = "S. Thomas and Cole, \{I. S.\} and Y. Gonzalez-Garcia and M. Chen and M. Musameh and Mol, \{J. M.C.\} and H. Terryn and N. Birbilis",

note = "{\textcopyright}2014 The authors ",

year = "2014",

month = jun,

doi = "10.1007/s10800-014-0684-0",

language = "English",

volume = "44",

pages = "747--757",

journal = "Journal of Applied Electrochemistry",

issn = "0021-891X",

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TY - JOUR

T1 - Oxygen consumption upon electrochemically polarised zinc

AU - Thomas, S.

AU - Cole, I. S.

AU - Gonzalez-Garcia, Y.

AU - Chen, M.

AU - Musameh, M.

AU - Mol, J. M.C.

AU - Terryn, H.

AU - Birbilis, N.

PY - 2014/6

Y1 - 2014/6

N2 - A Pt microelectrode was used to measure the oxygen consumption by redox reduction (ORR) on electrochemically polarised zinc in the redox competition mode. Zinc was polarised in the active and passive state, using a pH 7 and pH 13 solution, respectively. At pH 7, the oxygen concentration measured at a distance of 50 μm from the zinc surface, using the Pt microelectrode, is 15-60 % of the bulk oxygen concentration. Therefore, correspondingly, the oxygen consumption by zinc (due to ORR) is 40-85 % of the bulk oxygen concentration. At pH 13, where zinc undergoes passivation, the oxygen consumption by zinc is 70-80 % of the bulk oxygen concentration. The ORR rate on the surface of zinc passive films (ZnO/Zn(OH)2) is thus significant when compared to that on bare/actively corroding zinc. The influence of the electrode kinetics of zinc corrosion, on oxygen diffusion towards the metal surface has been investigated in this study.

AB - A Pt microelectrode was used to measure the oxygen consumption by redox reduction (ORR) on electrochemically polarised zinc in the redox competition mode. Zinc was polarised in the active and passive state, using a pH 7 and pH 13 solution, respectively. At pH 7, the oxygen concentration measured at a distance of 50 μm from the zinc surface, using the Pt microelectrode, is 15-60 % of the bulk oxygen concentration. Therefore, correspondingly, the oxygen consumption by zinc (due to ORR) is 40-85 % of the bulk oxygen concentration. At pH 13, where zinc undergoes passivation, the oxygen consumption by zinc is 70-80 % of the bulk oxygen concentration. The ORR rate on the surface of zinc passive films (ZnO/Zn(OH)2) is thus significant when compared to that on bare/actively corroding zinc. The influence of the electrode kinetics of zinc corrosion, on oxygen diffusion towards the metal surface has been investigated in this study.

KW - Oxygen

KW - Oxygen reduction reaction

KW - Passivity

KW - SECM

KW - Zinc

UR - https://www.scopus.com/pages/publications/84903308141

U2 - 10.1007/s10800-014-0684-0

DO - 10.1007/s10800-014-0684-0

M3 - Article

AN - SCOPUS:84903308141

SN - 0021-891X

VL - 44

SP - 747

EP - 757

JO - Journal of Applied Electrochemistry

JF - Journal of Applied Electrochemistry

IS - 6

ER -

Oxygen consumption upon electrochemically polarised zinc

Abstract

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