Journal
ACS NANO
Volume 15, Issue 2, Pages 3423-3433Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c10491
Keywords
biosorption; Ti3C2Tx MXenes; porous hybrid fibers; sodium-ion batteries; potassium-ion batteries; density functional theory calculations
Categories
Funding
- National Natural Science Foundation of China (NSFC) [21571080]
- Australian Research Council (ARC) [FT180100387, DP200103568]
- Australian Research Council [FT180100387, DP200103568] Funding Source: Australian Research Council
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This study designed a MXene@N-doped carbonaceous nanofiber structure through an in situ bioadsorption strategy, significantly improving the performance of sodium- and potassium-ion batteries. The microorganism-derived 2D MXene-1D N-doped carbonaceous nanofiber structure with fully opened pores and transport channels enhances ion conduction and transport, showing potential for addressing challenges in 2D energy storage materials.
As a typical family of two-dimensional (2D) materials, MXenes present physiochemical properties and potential for use in energy storage applications. However, MXenes suffer some of the inherent disadvantages of 2D materials, such as severe restacking during processing and service and low capacity of energy storage. Herein, a MXene@N-doped carbonaceous nanofiber structure is designed as the anode for high-performance sodium- and potassium-ion batteries through an in situ bioadsorption strategy; that is, Ti3C2Tx nanosheets are assembled onto Aspergillus niger biofungal nanoribbons and converted into a 2D/1D heterostructure. This microorganism-derived 2D MXene-1D N-doped carbonaceous nanofiber structure with fully opened pores and transport channels delivers high reversible capacity and long-term stability to store both Na+ (349.2 mAh g(-1) at 0.1A g(-1) for 1000 cycles) and K+ (201.5 mAh g(-1) at 1.0 A g(-1) for 1000 cycles). Ion-diffusion kinetics analysis and density functional theory calculations reveal that this porous hybrid structure promotes the conduction and transport of Na and K ions and fully utilizes the inherent advantages of the 2D material. Therefore, this work expands the potential of MXene materials and provides a good strategy to address the challenges of 2D energy storage materials.
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