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12. A general Lewis acidic etching route for preparing MXenes with enhanced electrochemical performance in non-aqueous electrolyte

Author

Li, Youbing, Shao, Hui, Lin, Zifeng, Lu, Jun, Persson, Per O. A., Eklund, Per, Hultman, Lars, Li, Mian, Chen, Ke, Zha, Xian-Hu, Du, Shiyu, Rozier, Patrick, Chai, Zhifang, Raymundo-Piñero, Encarnacion, Taberna, Pierre-Louis, Simon, Patrice, and Huang, Qing

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science
Abstract

Two-dimensional carbides and nitrides of transition metals, known as MXenes, are a fast-growing family of 2D materials that draw attention as energy storage materials. So far, MXenes are mainly prepared from Al-containing MAX phases (where A = Al) by Al dissolution in F-containing solution, but most other MAX phases have not been explored. Here, a redox-controlled A-site-etching of MAX phases in Lewis acidic melts is proposed and validated by the synthesis of various MXenes from unconventional MAX phase precursors with A elements Si, Zn, and Ga. A negative electrode of Ti3C2 MXene material obtained through this molten salt synthesis method delivers a Li+ storage capacity up to 738 C g-1 (205 mAh g-1) with high-rate performance and pseudocapacitive-like electrochemical signature in 1M LiPF6 carbonate-based electrolyte. MXene prepared from this molten salt synthesis route offer opportunities as high-rate negative electrode material for electrochemical energy storage applications.

Published
2019

17. Influences from Solvents on Charge Storage in Titanium Carbide MXenes

Author

Wang, Xuehang, primary, Mathis, Tyler S., additional, Li, Ke, additional, Lin, Zifeng, additional, Vlcek, Lukas, additional, Torita, Takeshi, additional, Osti, Naresh C., additional, Hatter, Christine, additional, Urbankowski, Patrick, additional, Sarycheva, Asia, additional, Tyagi, Madhusudan, additional, Mamontov, Eugene, additional, Simon, Patrice, additional, and Gogotsi, Yury, additional

Published
2023
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38. Tailoring Tribological Characteristics in Titanium Alloys by Laser Surface Texturing and 2D Ti3C2Tx MXene Nanocoating.

Author

Zhang, Qicheng, Li, Yong, Liang, Fei, Zhang, Haoran, Wang, Bin, Li, Xiaopeng, Lin, Zifeng, Lin, Yan, and Chen, Xiang

Subjects
STRAIN hardening, SURFACE texture, SUBSTRATES (Materials science), NANOCOATINGS, WEAR resistance
Abstract

The inferior tribological properties of titanium (Ti) and its alloys, due to their limited work hardening capability and the mechanical instability of their oxide scale, pose substantive challenges in practical applications. Surface texturing and the application of 2D material coatings are acknowledged as efficacious strategies for enhancing these properties. Nevertheless, the rapid loss of effectiveness when employing these methods in isolation highlights a significant limitation. Herein, a 50‐nm‐thick MXene nanocoating is deposited onto groove‐textured pure Ti surface, effectuating a reduction in the coefficient of friction (COF) from ≈0.57 to 0.17, thereby substantially mitigating wear on the Ti substrate. The grooved surface architecture plays a vital role in storing MXenes and facilitating lubricant replenishment through the stirring effect of frictional stress during subsequent friction process. Further, the continuous decomposition and reorganization of MXene coating results in the formation of a robust tribofilm that resists oxidation and plastic deformation in the subsurface layer, markedly enhancing the friction and wear resistance. These findings are crucial for improving tribological performance in Ti and its alloys and provide a straightforward yet effective strategy for tailoring their tribological properties by integrating LST with 2D material nanocoating. [ABSTRACT FROM AUTHOR]

Published
2024
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39. Influence of Surface Groups on Electrochemical Properties of Molten Salt Synthesized Ti3C2Tx in Mild Aqueous Electrolytes.

Author

Guan, Bin, Ma, Guoliang, and Lin, Zifeng

Subjects
AQUEOUS electrolytes, ELECTRIC conductivity, DEIONIZATION of water, ENERGY storage, MINIMAL surfaces, FUSED salts
Abstract

MXene, notable for its excellent electrical conductivity and tunable surface groups, has garnered widespread attention in the field of electrochemical energy storage. Here, Ti3C2Tx MXene was synthesized by a Lewis acid molten salt‐shielded synthesis (MS3). The surface groups (−Cl, −O) were modified by washing Ti3C2Tx samples with various solutions (deionized water, 0.5 M hydrochloric acid (HCl), 0.5 M ammonium persulfate solution (APS)) and/or thermal treatments under an argon atmosphere at 300 °C, 500 °C, and 700 °C. It is shown that deionized water and HCl solution washing have minimal impact on the surface groups, while APS washing can increase the content of −O surface group. Conversely, thermal treatment may remove the −O. Electrochemical charge storage behavior of these Ti3C2Tx variants were further investigated in a 1 M acetate electrolyte buffered at pH=5.0. It is indicated that the −Cl surface group is electrochemically inert, whereas the −O may significantly improve the charge storage performance. Ti3C2Tx with high −O content delivered an impressive maximum capacity of 155 C g−1. This research underscores the crucial role of surface groups on the electrochemical performance of Ti3C2Tx in mild aqueous electrolytes, offering valuable insights for future modifications and applications of Ti3C2Tx in energy storage technologies. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Ti2CTx MXene Cathode Host for Enhanced Zinc‐Bromine Battery Performance.

Author

Guo, Jiajun, Ma, Guoliang, Liu, Guoqiang, Dai, Chunlong, and Lin, Zifeng

Subjects
BROMINE, CARBON-based materials, ENERGY storage, CATHODES, ELECTRIC batteries, CHEMICAL kinetics
Abstract

Aqueous zinc‐bromine batteries represent a promising large‐scale energy storage system, yet generally suffer from the dissolution of polybromides in the cathode. Currently, various nonpolar carbon materials are employed as hosts for the bromine cathode. Still, they typically exhibit weak adsorption capabilities toward polybromides. Here, a highly conductive Ti2CTx MXene synthesized through an eco‐friendly molten salt method is reported, serving as an ideal bromine cathode host material for the first time. Ti2CTx MXene shows strong chemisorptive capability to soluble polybromide species and can effectively immobilize them for enhanced coulombic efficiency and prolong cycling life of zinc‐bromine batteries. Additionally, Ti2CTx MXene enhances the reaction kinetics of the bromine cathode. Benefiting from the synergistic polybromide adsorption and catalysis effects of Ti2CTx, the dual‐plating zinc‐bromine batteries exhibit good cycle stability, with a capacity retention of 87% after 3000 cycles, outperforming traditional carbon host which fail after 2300 cycles. Meanwhile, Ti2CTx achieves a much lower polarization voltage of only 84 mV, significantly less than 240 mV observed with carbon hosts. This research highlights the potential of developing host materials with polybromide chemisorptive properties to advance the performance of zinc‐bromine batteries. [ABSTRACT FROM AUTHOR]

Published
2024
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