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<p>Mg<sub>3</sub>(Sb, Bi)<sub>2</sub> is the most promising candidate as a next-generation thermoelectric cooling material; however, its application is bottlenecked by poor moisture stability. We demonstrate a protection strategy for Mg<sub>3</sub>(Sb, Bi)<sub>2</sub> by constructing anodic phases that are preferentially corroded to protect the cathodic material matrix, as enabled by the in situ formation of uniformly distributed multiscale anodic phases based on a large Pilling–Bedworth ratio, low equilibrium potential, high chemical inertness and rapid oxide/hydroxide coverage ability. Mg<sub>17</sub>Al<sub>12</sub> preferentially corrodes and promotes the formation of a protective film, reducing the average corrosion rate of Mg<sub>3</sub>(Sb, Bi)<sub>2</sub> by 92% to ~95 μm year<sup>−1</sup> in air and 86% to ~0.36 μm h<sup>−1</sup> in water, achieving excellent corrosion resistance. The cooling performance of the fabricated module is comparable with that of commercial bismuth telluride modules at 300 K, and exceeds them at 325 K and 350 K. Meanwhile, no performance degradation is observed after 28-day aging at 350 K and 70% relative humidity. Our study addresses the issues of moisture stability of Mg<sub>3</sub>(Sb, Bi)<sub>2</sub> during storage, processing and application, and could be extended to other aqueous vapour-sensitive materials.</p>

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Anodic protection enables moisture-stable Mg3(Sb, Bi)2 for thermoelectric cooling

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Zhiyuan Yu,
  • Yuxin Sun,
  • Haijun Wu,
  • Fengkai Guo,
  • Jin Hu,
  • Ming Liu,
  • Xianghong Zhou,
  • Hao Wu,
  • Jinsuo Hu,
  • Lankun Wang,
  • Yuke Zhu,
  • Haoyang Tong,
  • Jianbo Zhu,
  • Zihang Liu,
  • Wei Cai,
  • Weishu Liu,
  • Jiehe Sui

摘要

Mg3(Sb, Bi)2 is the most promising candidate as a next-generation thermoelectric cooling material; however, its application is bottlenecked by poor moisture stability. We demonstrate a protection strategy for Mg3(Sb, Bi)2 by constructing anodic phases that are preferentially corroded to protect the cathodic material matrix, as enabled by the in situ formation of uniformly distributed multiscale anodic phases based on a large Pilling–Bedworth ratio, low equilibrium potential, high chemical inertness and rapid oxide/hydroxide coverage ability. Mg17Al12 preferentially corrodes and promotes the formation of a protective film, reducing the average corrosion rate of Mg3(Sb, Bi)2 by 92% to ~95 μm year−1 in air and 86% to ~0.36 μm h−1 in water, achieving excellent corrosion resistance. The cooling performance of the fabricated module is comparable with that of commercial bismuth telluride modules at 300 K, and exceeds them at 325 K and 350 K. Meanwhile, no performance degradation is observed after 28-day aging at 350 K and 70% relative humidity. Our study addresses the issues of moisture stability of Mg3(Sb, Bi)2 during storage, processing and application, and could be extended to other aqueous vapour-sensitive materials.