Vertically aligned 1T-2H MoS2 on 3D porous carbon for ultrahigh-performance flexible energy storage device,Journal of Materials Chemistry A

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Vertically aligned 1T-2H MoS2 on 3D porous carbon for ultrahigh-performance flexible energy storage device
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2023-09-26 , DOI: 10.1039/d3ta05004a
Zhao Wang _{1,

2,

3} , Zongwei Guo _{1,

2,

3} , Jiajun Luo _{1,

2,

3} , Xuesong Wang ₄ , Ming Li _{1,

2,

3} , Yuhui Ao _{1,

2,

3} , Lin Jin _{1,

2,

3}

Affiliation

The capacitance, conductivity, and ion migration ability of electrode materials are key factors affecting the energy density of supercapacitors (SCs). The synergistic application of porous carbon and two-dimensional (2D) materials can solve these problems. In this study, we successfully constructed porous B, N co-doped carbon (BNC) scaffolds on the surface of carbon cloth (CC), and vertically ordered 1T-2H MoS₂ (1T-2H MS) nanosheets with large interlayer spacing were then assembled on their surfaces, providing highly distributed active sites and large specific surface areas, and rapid charge transfer capability for high-capacity electrode materials. Refined structural characterization and density functional theory (DFT) calculations indicated that 1T-2H MS@BNC/CC heterostructures have reasonable structural/phase design advantages, with a conversion rate of up to 77%. Benefiting from the structure and metal phase advantages, the 1T-2H MS@BNC/CC electrode exhibited a good electrochemical storage mechanism under alkaline conditions, with an ultrahigh-performance of 994.3 F g⁻¹ at a current density of 0.5 A g⁻¹, and cycling stability was maintained at 80% even after 6000 cycles. Furthermore, the resulting 1T-2H MS@BNC/CC//AC/CC asymmetrically flexible, all-solid-state supercapacitors (FASCs) achieved a dramatically high energy density of 92.3 Wh kg⁻¹ at 349.7 W kg⁻¹ and remarkable cycling lifespan (∼91% retention over 1000 cycles). Surprisingly, a single FASC could successfully activate the electronic clock for 15 minutes, and two FASCs in a series could light up the LED for 10 minutes. The outstanding FASCs exhibited perfect structural and durable stability upon bending, indicating their superiority in flexible energy storage devices.

中文翻译：

3D多孔碳上垂直排列的1T-2H MoS2用于超高性能柔性储能装置

电极材料的电容、电导率和离子迁移能力是影响超级电容器（SC）能量密度的关键因素。多孔碳和二维（2D）材料的协同应用可以解决这些问题。在本研究中，我们成功地在碳布（CC）表面构建了多孔B、N共掺杂碳（BNC）支架，并垂直有序排列了1T-2H MoS ₂然后在其表面组装具有大层间距的（1T-2H MS）纳米片，为高容量电极材料提供高度分布的活性位点和大的比表面积以及快速的电荷转移能力。精细的结构表征和密度泛函理论（DFT）计算表明1T-2H MS@BNC/CC异质结构具有合理的结构/相设计优势，转化率高达77%。^{受益于结构和金属相的优势，1T-2H MS@BNC/CC电极在碱性条件下表现出良好的电化学存储机制，在0.5 A g −1}的电流密度下具有994.3 F g ⁻¹的超高性能。，循环稳定性在6000次循环后仍保持在80%。此外，所得的1T-2H MS@BNC/CC//AC/CC不对称柔性全固态超级电容器（FASC）在349.7 W kg ^{-1下实现了92.3 Wh kg}^-1的极高能量密度和出色的循环性能使用寿命（1000 次循环后保持率为 91%）。令人惊讶的是，单个 FASC 可以成功激活电子时钟 15 分钟，串联的两个 FASC 可以点亮 LED 10 分钟。出色的FASC在弯曲时表现出完美的结构和持久稳定性，表明了其在柔性储能装置中的优越性。

更新日期：2023-09-26

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