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Enhanced dehydrogenation kinetics of LiBH4 catalyzed by Ti/V/Li3BO3 hetero-ensembles derived from Ti2VC2 MXene.

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Title: Enhanced dehydrogenation kinetics of LiBH4 catalyzed by Ti/V/Li3BO3 hetero-ensembles derived from Ti2VC2 MXene.
Authors: Chen, Jinting1,2 (AUTHOR), Wang, Lei1,2 (AUTHOR), Yao, Ming1,2 (AUTHOR), Pan, Yue1,2 (AUTHOR), Zhang, Zeyu1,2 (AUTHOR), Li, Yawei1,2 (AUTHOR), Huang, Haixiang1,2 (AUTHOR), Liu, Bogu1,2 (AUTHOR), Yuan, Jianguang2 (AUTHOR), Zhang, Bao2 (AUTHOR), Wu, Ying1,2 (AUTHOR) wuying@ncepu.edu.cn
Source: Journal of Alloys & Compounds. Apr2026, Vol. 1062, pN.PAG-N.PAG. 1p.
Subjects: Dehydrogenation kinetics, Lithium borohydride, Activation energy, Heterogeneous catalysis, Hydrogen storage, Heterogeneous catalysts, Dehydrogenation
Abstract: To address the sluggish dehydrogenation kinetics and high operating temperatures of LiBH 4 , Ti 2 VC 2 MXene was incorporated with LiBH 4 to modify its dehydrogenation performance. With 40 wt% Ti 2 VC 2 MXene additive, the onset dehydrogenation temperature of LiBH 4 is reduced to 98.31 °C, while the peak hydrogen release occurs at 332.86 °C. Isothermal dehydrogenation measurements demonstrate that the composite rapidly desorbs 9.50 wt% H 2 within 40 min at 325 °C, 10.67 times faster than that of LiBH 4. Furthermore, the addition of 40 wt% Ti 2 VC 2 MXene effectively lowers the activation energies for the dehydrogenation to 104.76 and 112.99 kJ mol⁻1, respectively. Mechanism studies reveal that the enhanced dehydrogenation performance originates from the in-situ formation of catalytic active species, including Ti0, V0 and Li 3 BO 3 , promoting the cleavage of ionic and covalent bonds in LiBH 4. Simultaneously, the multiphase Ti/V/Li 3 BO 3 hetero-ensembles create abundant interfacial boundaries, serving as efficient pathways for hydrogen diffusion and accelerating the dehydrogenation kinetics. [Display omitted] • Addition of Ti 2 VC 2 lowers onset and peak desorption temperatures of LiBH 4 by 166.99 and 84.44 °C, respectively. • The LiBH 4 -40Ti 2 VC 2 releases 9.50 wt% H 2 at 325 °C within 40 min, about 10.67 times higher than that of LiBH 4. • The in-situ formed Ti/V/Li 3 BO 3 hetero-ensembles construct abundant interfaces, boosting the hydrogen release rate. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:To address the sluggish dehydrogenation kinetics and high operating temperatures of LiBH 4 , Ti 2 VC 2 MXene was incorporated with LiBH 4 to modify its dehydrogenation performance. With 40 wt% Ti 2 VC 2 MXene additive, the onset dehydrogenation temperature of LiBH 4 is reduced to 98.31 °C, while the peak hydrogen release occurs at 332.86 °C. Isothermal dehydrogenation measurements demonstrate that the composite rapidly desorbs 9.50 wt% H 2 within 40 min at 325 °C, 10.67 times faster than that of LiBH 4. Furthermore, the addition of 40 wt% Ti 2 VC 2 MXene effectively lowers the activation energies for the dehydrogenation to 104.76 and 112.99 kJ mol⁻1, respectively. Mechanism studies reveal that the enhanced dehydrogenation performance originates from the in-situ formation of catalytic active species, including Ti0, V0 and Li 3 BO 3 , promoting the cleavage of ionic and covalent bonds in LiBH 4. Simultaneously, the multiphase Ti/V/Li 3 BO 3 hetero-ensembles create abundant interfacial boundaries, serving as efficient pathways for hydrogen diffusion and accelerating the dehydrogenation kinetics. [Display omitted] • Addition of Ti 2 VC 2 lowers onset and peak desorption temperatures of LiBH 4 by 166.99 and 84.44 °C, respectively. • The LiBH 4 -40Ti 2 VC 2 releases 9.50 wt% H 2 at 325 °C within 40 min, about 10.67 times higher than that of LiBH 4. • The in-situ formed Ti/V/Li 3 BO 3 hetero-ensembles construct abundant interfaces, boosting the hydrogen release rate. [ABSTRACT FROM AUTHOR]
ISSN:09258388
DOI:10.1016/j.jallcom.2026.187624