Synthesis of nanoflower-shaped MXene derivative with unexpected catalytic activity for dehydrogenation of sodium alanates.

Zou, Guodong; Liu, Baozhong; Guo, Jianxin; Zhang, Qingrui; Fernandez, Carlos; Peng, Qiuming

Abstract

Surface group modification and functionalization of two-dimensional materials in many cases are deemed as effective approaches to achieve some distinctive properties. Herein, we present a new nanoflower-shaped TiO2/C composite which was synthesized by in situ alcoholysis of two-dimensional layered MXene (Ti3C2(OHxF1-x)2) in a dilute HF solution (0.5 wt %) for the first time. Furthermore, it is demonstrated that it bestows a strong catalytic activity for the dehydrogenation of NaAlH4. The results show that the NaAlH4 containing 10 wt % A0.9R0.1-TiO2/C (containing 90% anatase TiO2 and 10% rutile TiO2) composite merely took ∼85 min to reach a stable and maximum dehydrogenation capacity of ∼3.08 wt % at 100 °C, and it maintains stable after ten cycles, which is the best Ti-based catalyst for the dehydrogenation of NaAlH4 reported so far. Theoretical calculation confirms that this C-doping TiO2 crystals remarkably decreases desorption energy barrier of Al-H bonding in NaAlH4, accelerating the breakdown of Al-H bonding. This finding raises the potential for development and application of new fuel cells.

Citation

ZOU, G., LIU, B., GUO, J., ZHANG, Q., FERNANDEZ, C. and PENG, Q. 2017. Synthesis of nanoflower-shaped MXene derivative with unexpected catalytic activity for dehydrogenation of sodium alanates. ACS applied materials and interfaces [online], 9(8), pages 7611-7618. Available from: https://doi.org/10.1021/acsami.6b13973

• Journal Article Type: Article
• Acceptance Date: Feb 13, 2017
• Online Publication Date: Feb 14, 2017
• Publication Date: Mar 1, 2017
• Deposit Date: Nov 2, 2017
• Publicly Available Date: Feb 15, 2018
• Journal: ACS applied materials and interfaces
• Print ISSN: 1944-8244
• Electronic ISSN: 1944-8252
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 8
• Pages: 7611-7618
• DOI: https://doi.org/10.1021/acsami.6b13973
• Keywords: Catalytic properties; Dehydrogenation; MXene; Phase transformation; Two dimension
• Public URL: http://hdl.handle.net/10059/2572
• Contract Date: Nov 2, 2017