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<p>The ErCo<sub>2</sub> intermetallic compound exhibits a significant magnetocaloric effect at approximately 32 K and has potential applications as a magnetic refrigeration material for hydrogen liquefaction. However, exposure to a hydrogen atmosphere may lead to hydride formation, which weakens the magnetocaloric effect. Thus, preventing hydrogen permeation into ErCo<sub>2</sub> is crucial. Herein, we enhance the hydrogen permeation barrier (HPB) performance of ErCo<sub>2</sub> particles by using electroless Cu plating followed by oxidation treatment to form a CuO layer with a thickness of a few micrometers. In experiments, ErCo<sub>2</sub> particles, with a　1.5- to 5-µm-thick CuO surface layer, exhibited a large magnetic entropy change of 24 J kg⁻¹ K⁻¹ even after exposure to a H<sub>2</sub> atmosphere at 1.27 MPa and 296 K for 7 d. Experimental analyses and first-principles calculations revealed the potential of CuO as an HPB material for magnetic refrigeration.</p>

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Enhancing hydrogen permeation barrier performance of ErCo2 magnetic refrigeration material via surface oxide layer formation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月7日

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  • Ya Xu,
  • Keiji Oyoshi,
  • Haruka Yoshikawa,
  • Hiroyuki Takeya,
  • Hiroshi Amekura,
  • Takafumi D. Yamamoto,
  • Yoshitaka Matsushita,
  • Alexei A. Belik,
  • Miyoko Tanaka,
  • Akiko T. Saito,
  • Koji Kamiya,
  • Yoshihiko Takeda

摘要

The ErCo2 intermetallic compound exhibits a significant magnetocaloric effect at approximately 32 K and has potential applications as a magnetic refrigeration material for hydrogen liquefaction. However, exposure to a hydrogen atmosphere may lead to hydride formation, which weakens the magnetocaloric effect. Thus, preventing hydrogen permeation into ErCo2 is crucial. Herein, we enhance the hydrogen permeation barrier (HPB) performance of ErCo2 particles by using electroless Cu plating followed by oxidation treatment to form a CuO layer with a thickness of a few micrometers. In experiments, ErCo2 particles, with a　1.5- to 5-µm-thick CuO surface layer, exhibited a large magnetic entropy change of 24 J kg⁻¹ K⁻¹ even after exposure to a H2 atmosphere at 1.27 MPa and 296 K for 7 d. Experimental analyses and first-principles calculations revealed the potential of CuO as an HPB material for magnetic refrigeration.