We report the design and synthesis of a bismuth metal–organic framework (MOF), MOF-836. This MOF is loaded with Sb salts in its pores and is used as the precursor for the production of Bi–Sb alloy nanoparticles by the nanoscale laser metallurgy method in the air. The resulting Bi–Sb alloy nanoparticles, Bi_1–xSb_x(from MOF-836), exhibit uniform particle sizes of 30 ± 10 nm, and their compositions are precisely controlled by tuning the content of Sb in MOF-836. These Bi–Sb alloys, along with the ones prepared from another Bi-MOF, CAU-7, were employed as anodes for sodium-ion batteries (SIBs). The nanosized Bi_0.70Sb_0.30(from MOF-836) alloys showed a specific capacity of 259.8 mAh g^–1 at 200 mA g^–1 after 500 cycles, and excellent cycling performance, capacity retention of 180.9 mAh g^–1 at 1 A g^–1 over 1000 cycles with a capacity loss of only 0.055% per cycle. This nanoscale laser metallurgy method using MOFs as precursors represents a new way to prepare alloy nanoparticles.

中文翻译：

---

激光冶金从MOF合成钠离子电池的均匀Bi-Sb合金纳米粒子

我们报告了铋金属有机框架（MOF），MOF-836的设计和合成。该MOF在其孔中充满了Sb盐，并被用作通过纳米级激光冶金法在空气中生产Bi-Sb合金纳米颗粒的前体。生成的Bi–Sb合金纳米粒子Bi _{1– x} Sb _x（来自MOF-836）显示出30±10 nm的均匀粒径，并且可以通过调节MOF-836中的Sb含量来精确控制其成分。这些Bi-Sb合金以及由另一种Bi-MOF CAU-7制备的合金被用作钠离子电池（SIB）的阳极。纳米Bi _0.70 Sb _0.30（来自MOF-836）合金在200 mA g下的比容量为259.8 mAh g ^–1经过500次循环后^–1，并且具有出色的循环性能，在1000次循环中，在1 A g ^–1下的容量保持率为180.9 mAh g ^–1，每个循环的容量损失仅为0.055％。这种以MOFs为前体的纳米级激光冶金方法代表了一种制备合金纳米颗粒的新方法。