Experimental and theoretical studies on two-dimensional vanadium carbide hybrid nanomaterials derived from V4AlC3 as excellent catalyst for MgH2

Zhiqiang Lan, Huiren Liang, Xiaobin Wen, Jiayang Hu, Hua Ning, Liang Zeng, Haizhen Liu, Jun Tan, Jürgen Eckert, Jin Guo

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

1 Zitat (Scopus)

Abstract

Hydrogen is considered one of the most ideal future energy carriers. The safe storage and convenient transportation of hydrogen are key factors for the utilization of hydrogen energy. In the current investigation, two-dimensional vanadium carbide (VC) was prepared by an etching method using V4AlC3 as a precursor and then employed to enhance the hydrogen storage properties of MgH2. The studied results indicate that VC-doped MgH2 can absorb hydrogen at room temperature and release hydrogen at 170 °C. Moreover, it absorbs 5.0 wt.% of H2 within 9.8 min at 100 °C and desorbs 5.0 wt.% of H2 within 3.2 min at 300 °C. The dehydrogenation apparent activation energy of VC-doped MgH2 is 89.3 ± 2.8 kJ/mol, which is far lower than that of additive-free MgH2 (138.5 ± 2.4 kJ/mol), respectively. Ab-initio simulations showed that VC can stretch Mg-H bonds and make the Mg-H bonds easier to break, which is responsible for the decrease of dehydrogenation temperature and conducive to accelerating the diffusion rate of hydrogen atoms, thus, the hydrogen storage properties of MgH2 are remarkable improved through addition of VC.
OriginalspracheEnglisch
Seiten (von - bis)3790-3799
Seitenumfang10
FachzeitschriftJournal of magnesium and alloys
Jahrgang11.2023
AusgabenummerOctober
DOIs
PublikationsstatusAngenommen/In Druck - 7 Okt. 2022

Bibliographische Notiz

Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant Nos. 52261038 and 51861002 ), the Natural Science Foundation of Guangxi Province (Grant No. 2018GXNSFAA294125 ), and the Innovation-driven Development Foundation of Guangxi Province (Grant No. AA17204063 ). J.E. acknowledges additional support by the Ministry of Science and Higher Education of the Russian Federation in the framework of the Increase Competitiveness Program of NUST "MISiS" (grant number K2-2020-046). We thank LetPub ( www.letpub.com ) for its linguistic assistance during the preparation of this manuscript.

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