YCxFy nanosheets-supported Ni nanoparticles as a high-efficient catalyst for hydrogen desorption of MgH2

• Published in: Nano research Vol. 16; no. 8; pp. 10938 - 10945
• Main Authors: Peng, Cong, Zhang, Qingan
• Format: Journal Article
• Language: English
• Published: Beijing Tsinghua University Press 01.08.2023; Springer Nature B.V
• Subjects: Atomic/Molecular Structure and Spectra; Biomedicine; Biotechnology; Carbon; Catalysts; Chemical synthesis; Chemistry and Materials Science; Condensed Matter Physics; Crystallites; Crystals; Desorption; Electrocatalysis; Energy; Hydrogen; Hydrogen storage; Hydrogen storage materials; Hydrogenation; Kinetics; Magnesium; Magnesium fluorides; Materials Science; Nanoparticles; Nanosheets; Nanotechnology; Nitrogen; Research Article; Stability; magnesium hydride; kinetics; catalyst; hydrogen storage; cyclic stability
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-023-5800-1

Magnesium hydride (MgH 2 ) has been considered as a promising hydrogen storage material, but the pressing issues including sluggish kinetics and poor cyclic stability hampered its practical applications. Herein, a high-efficient catalyst comprising of YC x F y nanosheets-supported Ni nanoparticles (Ni 30 /YC x F y ) was designed and constructed aiming to resolve the abovementioned restrictions facing MgH 2 . After hybridizing with Ni 30 /YC x F y , the as-achieved MgH 2 –10 wt.% Ni 30 /YC x F y composite exhibits superior hydrogen desorption kinetics with an activation energy of 80.9 kJ·mol −1 and a high capacity retention of 97.6% after 50 cycles. It is confirmed that the in situ formed Mg 2 NiH 4 and YH 3 catalytic phases accelerate the hydrogen desorption kinetics, while the dispersed MgF 2 and carbon species prevent the crystallite growth, particle aggregation, and catalyst redispersion, contributing an excellent cyclic stability. This work provides a new strategy to synthesize efficient catalysts for hydrogen desorption of MgH 2 .