The effect of vacancy defective Mg (0001) surface on hydrogenation of Ni-Mg-CNTs: A mechanistic investigation

Underlying factors of mega pressure hysteresis in cerium-rich CaCu5-type metal hydrides and effective modification strategies

“…S2 in the ESI, † the calibration detail information for specic plane aer fast Fourier transform (FFT) treatment for Fig. 1(d-k) of LaNi 5 and CeNi 5 TEM cross-sectional samples reveal beam direction (BD) is [101] and [1][2][3][4][5][6][7][8][9][10], respectively. Besides, the (010) crystal face at BD: [101] and the (001) crystal face at BD: [1-10] can laterally or directly reect the lattice parameters a and c, from which one can likewise identify a sharp contraction on the a-axis and slight stretching phenomenon on the c-axis.…”

“…As a renewable and highly efficient energy carrier, hydrogen has received much attention in reducing or even eliminating energy and environmental crises. [1][2][3][4][5] Nevertheless, the commercialization of the hydrogen industry continues to be limited by the prohibitive cost of hydrogen storage and transportation. 6,7 Till date, hydrogen storage materials (HSMs) with varying crystal congurations have been explored, among which rare earth (RE)-based alloys with a CaCu 5 -type crystal structure stand out because of their high volumetric hydrogen storage capacity, room temperature de-/hydrogenation properties, and favorable PCT characteristics.…”

Boosting Hydrogen Storage Performance of MgH2 by Oxygen Vacancy-Rich H-V2O5 Nanosheet as an Excited H-Pump

“…In the case of oxygen vacancy-rich 2D V 2 O 5 nanosheets, the presence of oxygen vacancies could lead to a shift in the position of the Fermi energy level towards the valence band, resulting in an increase in the number of available states for electron transfer. Numerous experimental and theoretical studies have revealed that oxygen vacancies can boost hydrogen diffusion and decrease the activation energy of hydrogen sorption reactions, because oxygen vacancies can accelerate the electron transfer [ 31 – 35 ]. However, to the best of our knowledge, given the numerous researches on Mg-based hydrogen storage composites, it still lacks studies regarding the influence of oxygen vacancies-rich V 2 O 5 nanosheets on the hydrogen storage performances of MgH 2 and the specific mechanism of the oxygen vacancy remains vague.…”

CNTs-Pd as Efficient Bidirectional Catalyst for Improving Hydrogen Absorption/Desorption Kinetics of Mg/MgH2

“…Currently, a variety of hydrogen storage materials are being continuously discovered and researched. − Metal or metal intermetallic compounds with high atomic mass are considered typical hydrogen storage materials. ,− In recent years, magnesium hydride (MgH 2 ) has garnered increased attention due to its high hydrogen capacity (7.6 wt %), surpassing the final target established by the US Department of Energy for onboard hydrogen storage systems (6.5 wt %), as well as its excellent reversibility, natural abundance (ranking as the eighth most abundant element in the Earth’s crust), low cost (priced at $3 per kilogram for magnesium), and environmental compatibility, making it as one of the most promising hydrogen storage materials. ,− Nonetheless, MgH 2 continues to face challenges with its high thermal stability (Δ H = 76 kJ/mol) and sluggish dehydrogenation kinetics, which impede its practical application. , To address these limitations, significant efforts have been undertaken, proposing and exploring various effective approaches, including nanomaterials, nanoconfinement, and catalyst doping. ,,− …”