Novel fabrication of Porous Ni-5 wt.% Al alloy electrode below the melting point of Aluminum

Hyung Chul Ham, Sun Hee Choi, Seong Cheol Jang, Shin Ae Song, Sung Pil Yoon, Jonghee Han, Suk Woo Nam

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

An in-situ sintered Ni-5 wt.% Al alloy anode for high-temperature fuel cells (HTFCs) was fabricated successfully using a green sheet consisting of a physical mixture of inexpensive Ni and Al elemental powders at reduced temperatures. Two processes-the formation of Ni-Al alloy via the AlCl3 activator under flowing hydrogen gas and the sintering of Ni-Al-occurred at the same time during pretreatment for cell operation. The AlCl3 activator reduced the synthesis reaction temperature and sintering temperature of Ni-Al alloy to nearly 600 °C. A twophase alloy of a Ni3Al intermetallic compound and a Ni-Al solid solution was obtained after sintering at 600 °C. The creep resistance of the in-situ sintered Ni-5 wt.% Al alloy was better than that of the conventional Ni-Al alloy green sheet, even though the sintering temperature of the Ni-5 wt.% Al alloy was 600 °C. This novel preparation method for Ni-Al alloys can greatly reduce the cost of anode fabrication for HTFCs and in turn accelerate the commercialization of HTFCs.

Original languageEnglish
Pages (from-to)2131-2136
Number of pages6
JournalScience of Advanced Materials
Volume9
Issue number12
DOIs
Publication statusPublished - 2017 Dec 1

Bibliographical note

Funding Information:
Acknowledgments: This research was supported by the Global Research Laboratory Program through the National Research Foundation of Korea, funded by the Ministry of Science, ICT and Future Planning of Republic of Korea (Grant Number NRF-2009-00406) and also supported by the KIST institutional program at the Korea Institute of Science and Technology (2E27302).

Funding Information:
This research was supported by the Global Research Laboratory Program through the National Research Foundation of Korea, funded by the Ministry of Science, ICT and Future Planning of Republic of Korea (Grant Number NRF-2009-00406) and also supported by the KIST institutional program at the Korea Institute of Science and Technology (2E27302).

Publisher Copyright:
© 2017 by American Scientific Publishers.

Keywords

  • AlCl activator
  • Creep
  • High-temperature fuel cell
  • Mechanical strength
  • Nickel-Aluminum alloy

ASJC Scopus subject areas

  • General Materials Science

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