Strongly Coupled 2D Transition Metal Chalcogenide-MXene-Carbonaceous Nanoribbon Heterostructures with Ultrafast Ion Transport for Boosting Sodium/Potassium Ions Storage.
Strongly Coupled 2D Transition Metal Chalcogenide-MXene-Carbonaceous Nanoribbon Heterostructures with Ultrafast Ion Transport for Boosting Sodium/Potassium Ions Storage.
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DOI：
10.1007/s40820-021-00623-5
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发表时间：
2021-04-22
影响因子：
26.6
通讯作者：
Han W
中科院分区：
文献类型：
--
作者：
Cao J;Li J;Li D;Yuan Z;Zhang Y;Shulga V;Sun Z;Han W
首次提出了二维MXene纳米片材独特的“Janus”界面组装策略。对于较大半径的Na/K离子存储，获得了由大容量过渡金属硫化物、高导电性二维MXen和富N真菌碳基质组成的三元异质结构。强耦合的2D基三元异质结的高可及表面和界面为低能垒的Na和K离子提供了极好的表面假电容存储。网上版载有补充材料，可在10.1007/s40820-021-00623-5查阅。MXenes结合了二维(2D)纳米材料的优点，在下一代充电电池中显示出巨大的潜力。与其他2D材料类似，MXenes通常会出现严重的自团聚、低容量和不满意的耐久性，特别是对于较大的钠/钾离子，这损害了它们的实用价值。本工作设计了一种新型的具有超快离子传输特性的过渡金属硒(MSe，M- = ，Cu，Ni，Co)、MXene纳米片和富N碳纳米带自组装的三元异质结构，用于缓速型钠离子电池和钾离子电池。由于化学性质的多样性，带正电荷的MSE通过静电吸附固定在负电性羟基(-OH)表面，而真菌来源的CNRib则通过氨基桥联和氢键与MXene的另一侧结合。这种独特的基于MXene的异质结构防止了2D材料的重新堆积，增加了本征电导率，最重要的是，提供了超快的界面离子传输路径和额外的表面和界面存储位置，从而提高了SIB和PIB应用中的高速存储性能。定量动力学分析和密度泛函理论计算都表明，界面离子传输比原始Mxenes高几个数量级，从而大大增强了Na+(536.3 mAhg−1@0.1A g−1)和K+(305.6 mAhg−1@1.0A g−1)的储存能力和良好的长期循环稳定性。因此，这项工作为2D材料工程和低成本、但动力迟滞的后Li电池提供了新的见解。网上版载有补充材料，可在10.1007/s40820-021-00623-5查阅。
Unique “Janus” interfacial assemble strategy of 2D MXene nanosheets was proposed firstly. Ternary heterostructure consisting of high capacity transitional metal chalcogenide, high conductive 2D MXene and N rich fungal carbonaceous matrix was achieved for larger radius Na/K ions storages. The highly accessible surfaces and interfaces of the strongly coupled 2D based ternary heterostructures provide superb surficial pseudocapacitive storages for both Na and K ions with low energy barriers was verified. The online version contains supplementary material available at 10.1007/s40820-021-00623-5. Combining with the advantages of two-dimensional (2D) nanomaterials, MXenes have shown great potential in next generation rechargeable batteries. Similar with other 2D materials, MXenes generally suffer severe self-agglomeration, low capacity, and unsatisfied durability, particularly for larger sodium/potassium ions, compromising their practical values. In this work, a novel ternary heterostructure self-assembled from transition metal selenides (MSe, M = Cu, Ni, and Co), MXene nanosheets and N-rich carbonaceous nanoribbons (CNRibs) with ultrafast ion transport properties is designed for sluggish sodium-ion (SIB) and potassium-ion (PIB) batteries. Benefiting from the diverse chemical characteristics, the positively charged MSe anchored onto the electronegative hydroxy (–OH) functionalized MXene surfaces through electrostatic adsorption, while the fungal-derived CNRibs bonded with the other side of MXene through amino bridging and hydrogen bonds. This unique MXene-based heterostructure prevents the restacking of 2D materials, increases the intrinsic conductivity, and most importantly, provides ultrafast interfacial ion transport pathways and extra surficial and interfacial storage sites, and thus, boosts the high-rate storage performances in SIB and PIB applications. Both the quantitatively kinetic analysis and the density functional theory (DFT) calculations revealed that the interfacial ion transport is several orders higher than that of the pristine MXenes, which delivered much enhanced Na+ (536.3 mAh g−1@ 0.1 A g−1) and K+ (305.6 mAh g−1@ 1.0 A g−1 ) storage capabilities and excellent long-term cycling stability. Therefore, this work provides new insights into 2D materials engineering and low-cost, but kinetically sluggish post-Li batteries. The online version contains supplementary material available at 10.1007/s40820-021-00623-5.
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