Herein, ZnS nanoparticles on Nitrogen (N) and Sulphur (S) co-doped carbon nanosheets ([email protected]) are prepared through a highly efficient sol-gel synthesis. Interestingly, the ZnS nanoparticles are encapsulated in ultrathin carbon shells, which are crucial to buffer the volume changes of ZnS during sodium ion intercalation/de-intercalation. Meanwhile, the nanosheets and ultrafine carbon shells together constitute the N, S co-doped carbon framework, which not only can give rise to abundant active sites for sodium storage but also greatly enhance the electrical conductivity. As a result, the [email protected] achieves a reversible capacity of 734 mAh g⁻¹ at 0.5 A g⁻¹ and excellent cycling stability (73.6% capacity retention after 380 cycles at 0.5 A g⁻¹).

本文中，通过高效溶胶-凝胶合成制备了氮（N）和硫（S）共掺杂碳纳米片（[电子邮件保护]）上的ZnS纳米粒子。有趣的是，ZnS纳米粒子被封装在超薄碳壳中，这对于缓冲钠离子嵌入/脱嵌过程中ZnS的体积变化至关重要。同时，纳米片和超细碳壳共同构成了氮，硫共掺杂碳骨架，不仅可以形成丰富的钠存储活性位，而且可以大大提高导电性。结果，[受电子邮件保护]在0.5 A g ^-1下可实现734 mAh g ^-1的可逆容量，并具有出色的循环稳定性（在0.5 A g ^-1下进行380次循环后，容量保持率为73.6％））。