Synthesis of Cu-YSZ and Ni-Cu-YSZ cermets by a novel electroless technique for use as solid oxide fuel cell anode: Application potentiality towards fuel flexibility in biogas atmosphere

Rajashree Konar, Jayanta Mukhopadhyay, Abhijit Das Sharma, Rajendra N. Basu

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

A novel electroless technique is employed for synthesizing Cu-YSZ cermet with discrete deposition of Cu onto 8 mol% yttria-stabilized zirconia (YSZ) and alloyed with 90 weight % Ni using electroless Ni-YSZ cermet by mechanical mixing and heat treatment under controlled atmosphere for the application as solid oxide fuel cell anode. X-ray diffractograms using Lorentzian fits revealed a shift of Ni-Cu (111) and Ni-Cu (200) peaks suggesting the solid solution of the bimetallic phases. Unique core-shell microstructures for both Cu-YSZ and Ni-Cu-YSZ with YSZ as core and Cu/Ni-Cu as shell are observed. EDAX analyses confirms 90:10 weight ratios (Ni:Cu) in the shell position for the alloy cermet. While only 23 vol% of metal content in Cu-YSZ gives electrical conductivity of 700 S cm-1, a reasonably high value of 490 S cm-1 is obtained with 32 vol% of metal in Ni-Cu-YSZ. Electroless Ni-Cu-YSZ exhibits 98% efficiency towards methane reforming in simulated biogas environment and also shows significant tolerance to H2S (upto 25 ppm) in the input stream of the gas.

Original languageEnglish
Pages (from-to)1151-1160
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume41
Issue number2
DOIs
StatePublished - 12 Jan 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Keywords

  • Electroless Cu-YSZ
  • Electroless Ni-Cu-YSZ
  • Methane conversion in biogas
  • Ni-Cu alloying
  • Solid oxide fuel cell anode
  • Sulphur tolerance

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