Growth of Cr-Nitrides on Commercial Ni-Cr and Fe-Cr Base Alloys to Protect PEMFC Bipolar Plates

M. P. Brady; H. Wang; B. Yang; J. A. Turner; M. Bordignon; R. Molins; M. Abd Elhamid; L. Lipp; L. R. Walker

doi:10.1016/j.ijhydene.2006.08.044

Growth of Cr-Nitrides on Commercial Ni-Cr and Fe-Cr Base Alloys to Protect PEMFC Bipolar Plates

M. P. Brady, H. Wang, B. Yang, J. A. Turner, M. Bordignon, R. Molins, M. Abd Elhamid, L. Lipp, L. R. Walker

Chemistry and Nanoscience

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

110 Scopus Citations

Abstract

Nitridation of Cr-bearing alloys can yield low interfacial contact resistance (ICR), electrically conductive and corrosion-resistant CrN or Cr₂N base surfaces of interest for a range of electrochemical devices, including fuel cells, batteries, and sensors. This paper presents results of exploratory studies of the nitridation of commercially available, high Cr (30-35 wt%) Ni-Cr alloys and a ferritic high Cr (29 wt%) stainless steel for proton exchange membrane fuel cell (PEMFC) bipolar plates. A high degree of corrosion resistance in sulfuric acid solutions designed to simulate bipolar plate conditions and low ICR values were achieved. Oxygen impurities in the nitriding environment were observed to play a significant role in the nitrided surface structures that formed, with detrimental effects for the Ni-Cr base alloys, but beneficial effects for the stainless steel alloy. Positive results from single-cell fuel cell testing are also presented.

Original language	American English
Pages (from-to)	3778-3788
Number of pages	11
Journal	International Journal of Hydrogen Energy
Volume	32
Issue number	16
DOIs	https://doi.org/10.1016/j.ijhydene.2006.08.044 https://doi.org/10.1016/j.ijhydene.2006.08.044
State	Published - 2007

NREL Publication Number

NREL/JA-560-42504

Keywords

Bipolar plate
Fuel cell
Nitridation
Nitride
Oxidation

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Brady, M. P., Wang, H., Yang, B., Turner, J. A., Bordignon, M., Molins, R., Abd Elhamid, M., Lipp, L., & Walker, L. R. (2007). Growth of Cr-Nitrides on Commercial Ni-Cr and Fe-Cr Base Alloys to Protect PEMFC Bipolar Plates. International Journal of Hydrogen Energy, 32(16), 3778-3788. https://doi.org/10.1016/j.ijhydene.2006.08.044, https://doi.org/10.1016/j.ijhydene.2006.08.044

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abstract = "Nitridation of Cr-bearing alloys can yield low interfacial contact resistance (ICR), electrically conductive and corrosion-resistant CrN or Cr2N base surfaces of interest for a range of electrochemical devices, including fuel cells, batteries, and sensors. This paper presents results of exploratory studies of the nitridation of commercially available, high Cr (30-35 wt%) Ni-Cr alloys and a ferritic high Cr (29 wt%) stainless steel for proton exchange membrane fuel cell (PEMFC) bipolar plates. A high degree of corrosion resistance in sulfuric acid solutions designed to simulate bipolar plate conditions and low ICR values were achieved. Oxygen impurities in the nitriding environment were observed to play a significant role in the nitrided surface structures that formed, with detrimental effects for the Ni-Cr base alloys, but beneficial effects for the stainless steel alloy. Positive results from single-cell fuel cell testing are also presented.",

keywords = "Bipolar plate, Fuel cell, Nitridation, Nitride, Oxidation",

author = "Brady, {M. P.} and H. Wang and B. Yang and Turner, {J. A.} and M. Bordignon and R. Molins and {Abd Elhamid}, M. and L. Lipp and Walker, {L. R.}",

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Brady, MP, Wang, H, Yang, B, Turner, JA, Bordignon, M, Molins, R, Abd Elhamid, M, Lipp, L & Walker, LR 2007, 'Growth of Cr-Nitrides on Commercial Ni-Cr and Fe-Cr Base Alloys to Protect PEMFC Bipolar Plates', International Journal of Hydrogen Energy, vol. 32, no. 16, pp. 3778-3788. https://doi.org/10.1016/j.ijhydene.2006.08.044, https://doi.org/10.1016/j.ijhydene.2006.08.044

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AU - Brady, M. P.

AU - Wang, H.

AU - Yang, B.

AU - Turner, J. A.

AU - Bordignon, M.

AU - Molins, R.

AU - Abd Elhamid, M.

AU - Lipp, L.

AU - Walker, L. R.

PY - 2007

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AB - Nitridation of Cr-bearing alloys can yield low interfacial contact resistance (ICR), electrically conductive and corrosion-resistant CrN or Cr2N base surfaces of interest for a range of electrochemical devices, including fuel cells, batteries, and sensors. This paper presents results of exploratory studies of the nitridation of commercially available, high Cr (30-35 wt%) Ni-Cr alloys and a ferritic high Cr (29 wt%) stainless steel for proton exchange membrane fuel cell (PEMFC) bipolar plates. A high degree of corrosion resistance in sulfuric acid solutions designed to simulate bipolar plate conditions and low ICR values were achieved. Oxygen impurities in the nitriding environment were observed to play a significant role in the nitrided surface structures that formed, with detrimental effects for the Ni-Cr base alloys, but beneficial effects for the stainless steel alloy. Positive results from single-cell fuel cell testing are also presented.

KW - Bipolar plate

KW - Fuel cell

KW - Nitridation

KW - Nitride

KW - Oxidation

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JO - International Journal of Hydrogen Energy

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IS - 16

ER -

Growth of Cr-Nitrides on Commercial Ni-Cr and Fe-Cr Base Alloys to Protect PEMFC Bipolar Plates

Abstract

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Keywords

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