Abstract Due to its promising applications on catalysis, electronics and electrochemical energy storage, 2D Mo2C has emerged as an important member in the 2D family. Herein, an efficient and high-yield method was proposed for the preparation of ultra-thin 2D Mo2C via Na2CO3-assited carbothermal reduction of 2H–MoS2. It was found that 2H–MoS2 can be completely carbonized to Mo2C at a MoS2:Na2CO3:C molar ratio of 2:4.2:11 at 850 °C for 2 h. Meanwhile, the prepared Mo2C were intercalated by the co-product Na2S. After leaching treatment with deionized water, the intercalated Na2S was removed and high crystalline 2D Mo2C were successfully prepared. Furthermore, the addition of Na2CO3 as a desulfurizer can greatly promote the carburization and exfoliation rates of 2H–MoS2. As can be seen from the FE-SEM images, the prepared Mo2C has a pretty regular layered structure with the layer thickness of 5–15 nm.

中文翻译：

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通过 Na2CO3 辅助碳热还原 2H-MoS2 的二维碳化钼 (Mo2C) 的拓扑化学合成

摘要 由于其在催化、电子和电化学储能方面的有前景的应用，二维 Mo2C 已成为二维家族的重要成员。在此，提出了一种通过 Na2CO3 辅助碳热还原 2H-MoS2 制备超薄二维 Mo2C 的高效且高产率的方法。结果表明，在 MoS2:Na2CO3:C 摩尔比为 2:4.2:11 的条件下，2H-MoS2 可以在 850°C 下完全碳化为 Mo2C，时间为 2 小时。同时，制备的 Mo2C 被副产物 Na2S 嵌入。用去离子水浸出处理后，嵌入的 Na2S 被去除，成功制备了高结晶度的 2D Mo2C。此外，添加 Na2CO3 作为脱硫剂可以极大地促进 2H-MoS2 的渗碳和剥离速率。从 FE-SEM 图像中可以看出，