Self-Assembly of 0D–2D Heterostructure Electrocatalyst from MOF and MXene for Boosted Lithium Polysulfide Conversion Reaction,Advanced Materials

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Self-Assembly of 0D–2D Heterostructure Electrocatalyst from MOF and MXene for Boosted Lithium Polysulfide Conversion Reaction
Advanced Materials ( IF 27.4 ) Pub Date : 2021-07-09 , DOI: 10.1002/adma.202101204
Zhengqing Ye ₁ , Ying Jiang ₁ , Li Li _{1,

2,

3} , Feng Wu _{1,

2,

3} , Renjie Chen _{1,

2,

3}

Affiliation

The design of nanostructured electrocatalysts with high activity and long-term durability for the sluggish lithium polysulfide (LiPS) conversion reaction is essential for the development of high-performance lithium–sulfur (Li–S) batteries. Here, the self-assembly of bimetallic selenides on nitrogen-doped MXene (CoZn-Se@N-MX) based on the self-assembly of metal–organic framework and MXene is reported. A combination of 0D CoZn-Se nanoparticles and 2D N-MX nanosheet co-catalysts forms double lithiophilic-sulfifilic binding sites that effectively immobilize and catalytically convert LiPS intermediates. This 0D–2D heterostructure catalyst has a hierarchical porous architecture with a large active area and enables rapid Li ion diffusion, reduces the activation energy of Li₂S deposition, and lowers the energy barrier of Li₂S dissolution. In addition, an assembled CoZn-Se@N-MX hybrid synergistically prevents the aggregation of the CoZn-Se nanoparticles and restacking of the active areas of N-MX nanosheets during assembly and the LiPS conversion process. The Li–S battery with this 0D–2D catalyst delivers excellent rate capability, ultralong cycling life (over 2000 cycles), and a high areal capacity of 6.6 mAh cm⁻² with a low electrolyte/sulfur ratio of 5 µL mg⁻¹.

中文翻译：

MOF和MXene自组装0D-2D异质结构电催化剂用于促进多硫化锂转化反应

为缓慢的多硫化锂（LiPS）转化反应设计具有高活性和长期耐久性的纳米结构电催化剂对于开发高性能锂硫（Li-S）电池至关重要。在这里，报道了基于金属-有机骨架和 MXene 自组装的双金属硒化物在氮掺杂 MXene (CoZn-Se@N-MX) 上的自组装。0D CoZn-Se 纳米颗粒和 2D N-MX 纳米片助催化剂的组合形成了双亲锂硫结合位点，可有效固定和催化转化 LiPS 中间体。这种 0D-2D 异质结构催化剂具有分层多孔结构，活性面积大，可实现锂离子快速扩散，降低锂₂的活化能S 沉积，降低 Li ₂ S 溶解的能垒。此外，组装的 CoZn-Se@N-MX 杂化物在组装和 LiPS 转换过程中协同防止 CoZn-Se 纳米颗粒的聚集和 N-MX 纳米片活性区域的重新堆叠。具有这种 0D-2D 催化剂的 Li-S 电池具有出色的倍率性能、超长循环寿命（超过 2000 次循环）以及 6.6 mAh cm ^-2的高面积容量和 5 µL mg ^-1的低电解质/硫比。

更新日期：2021-08-17

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