Dual carbon engineering enabling 1T/2H MoS2 with ultrastable potassium ion storage performance,Nanoscale Horizons

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Dual carbon engineering enabling 1T/2H MoS2 with ultrastable potassium ion storage performance
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2023-12-20 , DOI: 10.1039/d3nh00404j
Rong Hu ₁ , Yanqi Tong ₁ , Jinling Yin ₁ , Junxiong Wu ₂ , Jing Zhao ₁ , Dianxue Cao ₁ , Guiling Wang ₁ , Kai Zhu ₁

Affiliation

Potassium-ion batteries (PIBs) as a promising and low-cost battery technology offer the advantage of utilizing abundant and cost-effective K-salt sources. However, the effective adoption of PIBs necessitates the identification of suitable electrode materials. The 1T phase of MoS₂ exhibits enhanced electronic conductivity and greater interlayer spacing compared to the 2H phase, leading to a capable potassium ion storage ability. Herein, we fabricated dual carbon engineered 1T/2H MoS₂ via a secure and straightforward ammonia-assisted hydrothermal method. The 1T/2H MoS₂@rGO@C structure demonstrated an expanded interlayer spacing (9.3 Å). Additionally, the sandwich-like structural design not only enhanced material conductivity but also effectively curbed the agglomeration of nanosheets. Remarkably, 1T/2H MoS₂@rGO@C exhibited impressive potassium storage ability, delivering capacities of 351.0 mA h g⁻¹ at 100 mA g⁻¹ and 233.8 mA h g⁻¹ at 1000 mA g⁻¹ following 100 and 1000 cycles, respectively. Moreover, the construction of a K-ion full cell was successfully achieved, utilizing perylene tetracarboxylic dianhydride (PTCDA) as the cathode, and manifesting a capacity of 294.3 mA h g⁻¹ at 100 mA g⁻¹ after 160 cycles. This underscores the substantial potential of employing the 1T/2H MoS₂@rGO@C electrode material for PIBs.

中文翻译：

双碳工程使 1T/2H MoS2 具有超稳定的钾离子存储性能

钾离子电池（PIB）作为一种有前景的低成本电池技术，具有利用丰富且经济高效的钾盐来源的优势。然而，PIB 的有效采用需要确定合适的电极材料。与2H相相比，MoS ₂的1T相表现出增强的电子传导性和更大的层间距，从而具有强大的钾离子存储能力。在此，我们通过安全且简单的氨辅助水热方法制造了双碳工程 1T/2H MoS ₂ 。 1T/2H MoS ₂ @rGO@C 结构表现出扩大的层间距（9.3 Å）。此外，类似三明治的结构设计不仅增强了材料的导电性，还有效地抑制了纳米片的团聚。值得注意的是，1T/2H MoS ₂ @rGO@C表现出令人印象深刻的钾储存能力，在100和1000次循环后，在100 mA g ^-1下的容量分别为351.0 mA hg ^-1和在1000 mA g ^-1下的233.8 mA hg ^{-1 。} 。此外，成功构建了钾离子全电池，利用苝四甲酸二酐（PTCDA）作为阴极，并在160次循环后在100 mA g ^-1下表现出294.3 mA hg ^-1的容量。这强调了将 1T/2H MoS ₂ @rGO@C 电极材料用于 PIB 的巨大潜力。

更新日期：2023-12-20

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