N-doped carbon coated Ti3C2 MXene as a high-efficiency catalyst for improving hydrogen storage kinetics and stability of NaAlH4

Zhenluo Yuan, Dafeng Zhang, Guangxin Fan, Yumei Chen, Yanping Fan and Baozhong Liu

Renewable Energy, 2022, vol. 188, issue C, 778-787

Abstract: The synthesis of highly stable catalysts for the de/hydriding kinetics and cycle stability of NaAlH4 is crucial. Herein, N-doped carbon coated two-dimensional layered Ti3C2 (Ti3C2/NC) catalyst was synthesized by a self-polymerization and heat-treatment method. Impressively, the Ti3C2/NC catalyst remarkably improves the dehydrogenation properties of NaAlH4 with dramatically enhanced dehydrogenation kinetics and stability. In detail, after adding 10 wt% Ti3C2/NC, the initial dehydrogenation temperature is lowered to 85 °C, 3.0 wt% hydrogen is liberated within 4 min at 140 °C, the first step of hydrogen desorption is completed in 57 min at 100 °C, and its capacity retention after 15 cycle tests can remain up to 96.3%. It can be found that in-situ formed Ti-species (Ti0 and Ti3+) during ball milling and the interaction between pyridinic-N and Ti0 are responsible for the enhanced hydrogen storage performance of NaAlH4. Moreover, the carbon can efficiently stabilize Ti species and results in high stability. This finding provides a new understanding of Ti-based MXene to catalyze the hydrogen storage for NaAlH4.

Keywords: Hydrogen storage materials; NaAlH4; MXene; Kinetics; Cycle stability (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:188:y:2022:i:c:p:778-787

DOI: 10.1016/j.renene.2022.02.068

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