Solid Hydrogen Storage Materials Research Articles

Development of Materials for Solid State Hydrogen Storage

Series of high entropy alloys designed on Hume-Rothery criterion was prepared and the probability of the empirical approach to hydrogen storage materials preparation was investigated. Calculated HEA’s with equimolar compositions were selected from the list of alloys with limited VEC (valence electron concentration), ΔS and ΔH. The phase composition of prepared materials was compared with the prediction model and material characteristics such as chemical composition, and phase composition were studied. In this article material characterization of predicted high-entropy alloys with various prediction parameters values will be presented in terms of empirical prediction methods for solid-state hydrogen storage materials.

Hydrogen Storage Performance of Mg/MgH2 and Its Improvement Measures: Research Progress and Trends.

Due to its high hydrogen storage efficiency and safety, Mg/MgH2 stands out from many solid hydrogen storage materials and is considered as one of the most promising solid hydrogen storage materials. However, thermodynamic/kinetic deficiencies of the performance of Mg/MgH2 limit its practical applications for which a series of improvements have been carried out by scholars. This paper summarizes, analyzes and organizes the current research status of the hydrogen storage performance of Mg/MgH2 and its improvement measures, discusses in detail the hot studies on improving the hydrogen storage performance of Mg/MgH2 (improvement measures, such as alloying treatment, nano-treatment and catalyst doping), and focuses on the discussion and in-depth analysis of the catalytic effects and mechanisms of various metal-based catalysts on the kinetic and cyclic performance of Mg/MgH2. Finally, the challenges and opportunities faced by Mg/MgH2 are discussed, and strategies to improve its hydrogen storage performance are proposed to provide ideas and help for the next research in Mg/MgH2 and the whole field of hydrogen storage.

Sodium fluotitanate with the formation of multicomponent catalytic species for superior hydrogen storage of magnesium hydride

Magnesium hydride (MgH2) has attracted more research interest as an excellent solid hydrogen storage material. Still, its stable thermodynamics and sluggish kinetics are the main obstacles to the widespread application, which can be solved by the exploration of an efficient catalyst to improve its hydrogen storage performance. In this study, sodium fluotitanate (Na2TiF6, NTF) as an additive was introduced into MgH2 through ball milling to enhance its hydrogen storage performance because there is a potential formation of fluoride, titanium-containing substance and sodium-bearing species that are beneficial for performance improvement. Unsurprisingly, the mechanism analysis shows that the in-situ generated TiH2, MgF2, NaMgH3, and TiF4 catalytically active species can realize the dual regulation of kinetic and thermodynamic properties, which together coordinate the enhancement of the hydrogen storage properties of MgH2. The starting hydrogen release temperature of MgH2-NTF-10 is significantly decreased to 226 °C, about 183 and 33 °C lower than pristine MgH2 and as-milled MgH2, respectively. About 6.1 wt% of hydrogen can be released at 300 °C in only 30 min with a much lower activation energy of 143.08 kJ/mol. Moreover, the reversible hydrogen storage performance is well displayed for MgH2-NTF-10 after ten cycles of hydrogen de/absorption, with 95% hydrogen storage capacity retention. Our results show that the synergistic functions of multiphase active components from the three-in-one additive of NTF may advance MgH2 further to practical applications.

Exploring Hydrogen Incorporation into the Nb4AlC3 MAX Phases: Ab Initio Calculations.

The Nb4AlC3 MAX phase can be regarded as a TMC structure with stacking faults, which has great potential as a novel solid hydrogen storage material. Herein, we used ab initio calculations for understanding the hydrogen incorporation into Nb4AlC3 MAX phases, including equilibrium structural characteristics, energy changes, electronic structures, bonding characteristics, and diffusion paths. According to the calculated results, H has thermal stability in the interstice of the Nb-Al layer, and the most probable insertion site is an octahedron (3-site) composed of three Nb atoms and three Al atoms. When C vacancies are introduced, the Nb-C layer has a specific storage capacity for H. In addition, Al vacancies can also be used as possible sites for H incorporation. Moreover, the introduction of vacancies significantly increase the hydrogen storage capacity of the MAX phase. According to the electronic structure and bonding characteristics, the excellent hydrogen storage ability of the Nb4AlC3 structure may be due to the formation of ionic bonds between H and Nb/Al. It is worth noting that the H-Al bond in the 1-site is a covalent bond and an ionic bond key mixture. The linear synchronous transit optimization study shows that only H diffusion in Al vacancies is not feasible. In conclusion, the Nb-Al layer in Nb4AlC3 can provide favorable conditions for the continuous insertion and subsequent extraction of H, while the vacancy structure is more suitable for H storage. Our work provides solid theoretical results for understanding the hydrogen incorporation into Nb4AlC3 MAX phases that can be helpful for the design of advanced hydrogen storage materials.

Coupling ultralow-content ruthenium with nickel hydroxide via corrosion engineering for highly efficient hydrogen generation from ammonia borane

Efficient and controllable release of hydrogen from solid hydrogen storage materials is a promising way to produce hydrogen safely and on-demand. The development of economical, highly active, easily recyclable catalysts is critical for practical applications, which remains a great challenging. Herein, the easily controllable and cost-effective corrosion strategy is ingeniously developed to simply prepare ultralow-content ruthenium coupled with nickel hydroxide on nickel foam (Ru–Ni–NF). After experiencing the spontaneous oxidation-reduction reactions between the reactive NF and Ru3+, ultrafine Ru nanoparticles decorated nickel hydroxide nanosheets are in situ intimately grown on porous NF networks. The optimal Ru–Ni–NF catalyst exhibits the excellent performance for catalytic hydrolysis of ammonia borane with a high turnover frequency (TOF) of 539.6 molH2 molRu−1 min−1 at 298 K and a low apparent activation energy of 36.4 kJ mol−1, due to the synergistic effect between Ru nanoparticles and nickel hydroxide nanosheets. Furthermore, the Ru–Ni–NF catalyst possesses easy separation and outstanding durability, which is superior to powdered catalysts. This study provides a facile and economical strategy for the preparation of ultralow-content noble metal supported metal foam-type catalysts for dehydrogenation of ammonia borane.

Mechanism of improving hydrogenation of Mg by in-situ formation of Al* in hydriding combustion synthesis

Magnesium hydride (MgH2) is an ideal solid hydrogen storage material and on-line hydrolysis hydrogen source. However, the synthesis of MgH2 usually requires harsh conditions of high temperature, high pressure and long duration, bringing great challenges to production cost and safety. In this paper, MgH2 is prepared by hydriding combustion synthesis (HCS) and the mechanism of improving Mg hydrogenation properties by the in-situ formation of Al* is revealed. Under low hydrogen pressure of 1 MPa, the hydrogenation degree of Mg can be greatly increased from 9.6% of pure Mg to 90.5% with 10 mol% Al added. In the activation stage, Al reacts with Mg to form Mg17Al12, which brings rich grain boundaries and provides rapid diffusion channels for hydrogen. Subsequently, in the hydrogenation stage, Mg17Al12 reacts with H2 to generate Al* in-situ, which are evenly distributed and act as nucleation sites for MgH2. Hydrogen molecules diffuse rapidly along the interface between Mg/MgH2 and Al* and are easily adsorbed and dissociated on the surface of nano-scale Al* . The unique disproportionation hydrogenation reaction of in-situ forming highly active metallic substances as excellent catalysts provides a new idea for the modification of Mg-based hydrogen storage materials.

Catalysis in Solid Hydrogen Storage: Recent Advances, Challenges, and Perspectives

Catalysis is at the core of previous energy transition. It has enabled the use of oil and natural gas as our primary energy sources in unprecedented ways and led to feedstocks enabling exceptionally high living standards in human history. In a decarbonized economy with hydrogen as the new energy vector, catalysis is already playing a key role in producing hydrogen. However, catalysts for the effective storage of hydrogen must be advanced. Many solid hydrogen storage materials such as magnesium‐based hydrides, alanates, and/or borohydrides display promising hydrogen densities far superior to the current state of compressed or liquid hydrogen. These solid materials have thermodynamic and kinetic barriers which severely hinder their practical hydrogen uptake and release. To date, most of these barriers for solid hydrides (especially boron or nitrogen compounds) are modified via catalysis; however, the catalytic species per se and their roles are obscure. Herein, a comprehensive overview of various catalysts for solid hydrogen storage materials, their catalytic roles, and the underpinning mechanisms is provided. The current state of knowledge is critically reviewed and gaps where further research intensification is needed to support rapid hydrogen generation and storage in solid materials for the emerging hydrogen economy are identified.

Significantly improved hydrogen storage properties of Mg90Al10 catalyzed by TiF3

Magnesium hydride (MgH 2 ) is one of the most promising materials for solid state hydrogen storage, but overly stable thermodynamics and sluggish kinetics of hydrogenation and dehydrogenation hinders its application. In this study, Mg 90 Al 10 was prepared by hydriding combustion synthesis (HCS), and then various Ti-based compounds (Ti, TiH 2 , TiO 2 and TiF 3 ) were introduced into Mg 90 Al 10 by ball milling. Mg 90 Al 10 + 10 wt% TiF 3 displays the most excellent dehydrogenation property compared with those doped with other Ti-based compounds. For instance, due to the addition of 10 wt% TiF 3 , the peak dehydrogenation temperature and the apparent dehydrogenation activation energy of the composite are 86 °C and 77.1 kJ/mol lower than those of Mg 90 Al 10 (364 °C and 155.95 kJ/mol). In addition, the catalytic effect of TiF 3 on the hydrogen storage properties of Mg 90 Al 10 has been investigated in detail. Except for the unreacted TiF 3 , Al 3 Ti and MgF 2 can be found during the first dehydrogenation process and remain stable in the subsequent de/hydrogenation cycles, which can act as the active sites to accelerate the hydrogen dissociation and recombination. Therefore, the excellent hydrogen storage properties of Mg 90 Al 10 + 10 wt% TiF 3 can be attributed to the catalytic effect of TiF 3 , in-situ formed Al 3 Ti and MgF 2 . Our result is very significant to emphasize the practical application of the Mg-Al hydrogen storage alloys. • The hydrogen storage property of Mg 90 Al 10 doped with TiF 3 is remarkably improved. • The onset dehydrogenation temperature is reduced to 175 °C after TiF 3 addition. • The Mg 90 Al 10 -TiF 3 shows superior hydrogenation/dehydrogenation cycling stability. • TiF 3 , the in-situ formed Al 3 Ti and MgF 2 exhibit excellent catalytic effect.

Modified MgH2 Hydrogen Storage Properties Based on Grapefruit Peel-Derived Biochar

Carbon materials play an important role in the development of solid hydrogen storage materials. The main purpose of this work is to study the low-cost synthesis of biomass carbon (BC) and its positive effect on the hydrogen storage behavior of magnesium hydride (MgH2). Herein, it is proven that when biomass carbon (BC) is used together with magnesium hydride (MgH2), biomass carbon can be used as an adsorption and desorption channel for hydrogen. The initial dehydrogenation temperature of MgH2 + 10 wt% BC composite is 250 °C, which is 110 °C lower than that of pure MgH2. In addition, the MgH2 + 10 wt% BC composite system can complete all dehydrogenation processes within 10 min at 350 °C. Meanwhile, 5.1 wt% H2 can also be dehydrogenated within 1 h at 300 °C. Under the same conditions, MgH2 hardly starts to release hydrogen. After complete dehydrogenation, the composite can start to absorb hydrogen at 110 °C. Under the conditions of 225 °C and 3 MPa, 6.13 wt% H2 can be absorbed within 1 h, basically reaching the theoretical dehydrogenation limit. Cycling experiments show that the MgH2 + 10 wt% BC composite has a good stability. After 10 cycles, the hydrogen storage capacity shows almost no obvious decline. It is believed that this study can help in the research and development of efficient carbon-based multifunctional catalysts.

A Unique Nanoflake‐Shape Bimetallic Ti–Nb Oxide of Superior Catalytic Effect for Hydrogen Storage of MgH2

MgH2 is one of the most promising solid hydrogen storage materials due to its high capacity, excellent reversibility, and low cost. However, its operation temperature needs to be greatly reduced to realize its practical applications, especially in the highly desired fuel cell fields. This work synthesizes a 2D nanoflake-shape bimetallic Ti-Nb oxide of TiNb2 O7 , which has high surface area and shows superior catalytic effect for the hydrogen storage of MgH2 . Incorporated with the TiNb2 O7 nanoflakes as low as 3 wt%, MgH2 shows a low onset dehydrogenation temperature of 178 °C, which is lowered by 100 °C compared with the pristine one. A dehydrogenation capacity as high as 7.0 wt% H2 is achieved upon heating to 300 °C. The capacity retention is as high as 96% after 30 cycles. The mechanism of the improved hydrogen storage properties is analyzed by density functional theory (DFT) calculation and the microstructural evolution during dehydrogenation and hydrogenation. This work provides an MgH2 system with high available capacity and low operation temperature by a unique structural design of the catalyst. The high surface area feature of the TiNb2 O7 nanoflakes and the synthesis method hopefully can develop the application of TiNb2 O7 .

Morphological, Structural and Hydrogen Storage Properties of LaCrO3 Perovskite-Type Oxides

Recently, perovskite-type oxides have attracted researchers as new materials for solid hydrogen storage. This paper presents the performances of perovskite-type oxide LaCrO3 dedicated for hydrogen solid storage using both numerical and experimental methods. Ab initio calculations have been used here with the aim to investigate the electronic, mechanical and elastic properties of LaCrO3Hx (x = 0, 6) for hydrogen storage applications. Cell parameters, crystal structures and mechanical properties are determined. Additionally, the cohesive energy indicates the stability of the hydride. Furthermore, the mechanical properties showed that both compounds (before and after hydrogenation) are stable. The microstructure and storage capacity at different temperatures of these compounds have been studied. We have shown that storage capacities are around 4 wt%. The properties obtained from this type of hydride showed that it can be used for future applications. XRD analysis was conducted in order to study the structural properties of the compound. Besides morphological, thermogravimetric analysis was also conducted on the perovskite-type oxide. Finally, a comparison of these materials with other hydrides used for hydrogen storage was carried out.

High-Entropy Alloys for Solid Hydrogen Storage: Potentials and Prospects.

Hydrogen storage is one of the most significant research areas for exploiting hydrogen energy economy. To store hydrogen with a high gravimetric/volumetric density, gaseous hydrogen storage systems require a very high-pressure compressed gas cylinder which is quite unsafe and the storage in the liquid form needs cryogenic containers to be maintained at roughly 20 K under ambient pressure because hydrogen has a very low critical temperature of 33 K. However, hydrogen can be stored in solid materials with higher concentration of hydrogen compared to the gaseous and liquid hydrogen storage systems. It is therefore, worthwhile to look into the experimental and theoretical research on prospective hydrogen storage materials. The hydride-forming alloys and intermetallic compounds are found to be the most important families of hydrogen storage materials. Multicomponent alloys consisting of five or more principal elements, also known as high-entropy alloys appear to have potential for the development as hydrogen storage materials. Hydride-forming elements like Ti, Zr, V, Nb, Hf, Ta, La, Ce, Ni, and others have been shown to have hydrogen storage properties and the ability to produce single-phase high-entropy intermetallics. Here, attempts will be made to present a short review on utilization of multicomponent high-entropy alloys as solid hydrogen storage materials. Furthermore, we will also present some of our work on the synthesis, structural–microstructural characterization and hydrogen storage properties of Ti–Zr–V–Cr–Ni equi-atomic hydride-forming high-entropy alloys. From the preliminary investigation, the maximum storage capacity in this system was observed to be 1.78 wt%, which is comparable to other hydrogen storage materials. The prospects of high-entropy-based alloys for hydrogen storage will be discussed.

Catalytic effect of NiO/C derived from Ni-UMOFNs on the hydrogen storage performance of magnesium hydride

Magnesium based solid hydrogen storage material (MgH2) has the advantages of good safety and high hydrogen storage capacity in the shipping field. However, the high hydrogen absorption and desorption temperature have not been well solved. Herein, this work proves that it is very effective to improve the hydrogen storage performance of MgH2 by doping nano NiO/C catalyst. Specifically, experimental results showed that MgH2 + 9 wt% NiO/C composite could dehydrogenate at 195 °C, which was 155 °C lower than pure MgH2. In addition, 6.21 wt% H2 could be released rapidly at 300 °C for 10 min. After complete dehydrogenation, the absorption rate of hydrogen is 50 °C, which is 80 °C lower than that of pure MgH2. Moreover, 5.13 wt% H2 could be absorbed within 1 h at 125 °C and 3 MPa hydrogen pressure. In addition, dehydrogenation and hydrogen absorption apparent activation energies of MgH2 + 9 wt% NiO/C composite are 70.26 kJ/mol and 25.55 kJ/mol lower than those of pure MgH2, respectively. The cycle experiment showed that MgH2 + 9 wt% NiO/C had excellent cycle stability and could maintain 98.8% hydrogen storage capacity after 20 cycles. Furthermore, the study of the catalytic mechanism indicated that NiO/C catalyst is evenly distributed on the surface of MgH2. More importantly, Mg2Ni/Mg2NiH4 is generated in situ, which acts as a "hydrogen pump" and speeds up hydrogen diffusion during the hydrogen absorption and desorption cycle.

Roles of in situ-formed NbN and Nb2O5 from N-doped Nb2C MXene in regulating the re/hydrogenation and cycling performance of magnesium hydride

The industrial use of magnesium hydride (MgH2) as a potential solid hydrogen storage material is limited because of its poor thermodynamic properties. In the present work, nitrogen-doped niobium carbide-supported niobium pentoxide (N-Nb2O5@Nb2C) was prepared using Nb2AlC and NH3·H2O as precursors and then employed to enhance the hydrogen storage properties of MgH2. It was found that in situ-formed NbN and Nb2O5 in N-Nb2O5@Nb2C-doped MgH2 could destabilize MgH2, improving the hydrogen storage properties of MgH2 at low temperatures. The N-Nb2O5@Nb2C-doped MgH2 composite started to release hydrogen at 178 °C and could uptake 5.0 wt% of hydrogen within 1.95 min at 90 °C and within 5 h at 30 °C. The capacity retention ratio of N-Nb2O5@Nb2C-doped MgH2 was 98.6%, which was much higher than that of additive-free MgH2 (73.5%) after 100 hydrogen absorption–desorption cycles. The mechanism analysis revealed that the presence of NbN and Nb2O5 could restrain the grain size of MgH2, provide more active sites and hydrogen diffusion paths, weaken the interaction between Mg and H, and elongate the length of Mg-H bond; thus, the cyclic stability and reversible hydrogen storage performance of MgH2 were significantly improved.

Boron-doping effect on the enhanced hydrogen storage of titanium-decorated porous graphene: A first-principles study

The exploitation of solid hydrogen storage materials is an important part of the large-scale application of hydrogen energy. However, Metal agglomeration is one of the main reasons that restrict the hydrogen storage performance of carbon-based hydrogen storage materials. Herein, we develop Ti-decorated boron doped porous graphene as a novel hydrogen storage material based on first-principles calculations. The geometry and electronic structure of Ti-decorated porous graphene with and without boron doped are calculated. Doping boron in porous graphene (PG) can significantly increase the metal-substrate interaction and prevents the formation of Ti-metal clusters. The Ti atom-decorated boron-doped porous graphene (Ti–B/PG) system can stably adsorb sixteen hydrogen molecules with a gravimetric hydrogen uptake of 8.58 wt%. The thermodynamic calculations prove a high usable capacity of the material, at the adsorbing and desorbing conditions of 25 °C, 30 atm and 100 °C, 3 atm. The excellent hydrogen capacity, good recyclability, and desirable desorption capacity of Ti–B/PG make it a very prospective material for hydrogen storage.

One-pot synthesis of ultrafine Ni0.13Co0.87P nanoparticles on halloysite nanotubes as efficient catalyst for hydrogen evolution from ammonia borane

Exploring low-cost and earth-abundant catalyst to efficiently release clean H2 from solid hydrogen storage materials is an appealing solution for exhausted fossil fuel and its associated environmental issue. Halloysite (Hal) nanotubes are regarded as promising alternative catalyst support for expensive synthetic support materials due to their low cost and abundant resource. Herein, we report a simple and controllable one-pot reaction followed by chemical reduction approach to manufacture Ni, Co, P hybrids on Hal as high-efficient and non-noble metal catalysts for hydrolysis of ammonia borane (AB). It is revealed that ultrafine Ni0.13Co0.87P nanoparticles with diameter of 1.4 nm are homogenously anchored on Hal surface with excellent stability. The synergy among Ni, Co and P in Ni0.13Co0.87P effectively enhances their interaction with AB, resulting in reduced activation energy (41.8 kJ mol−1) and consequently significant boost of hydrolytic catalytic activity (TOF 47.5 molH2 molcat−1 min−1). A proposed mechanism demonstrates water molecules involve in the hydrolysis reaction and the rate-determining step is the OH cleavage in H2O. This work affords a prospective idea for the exploiting of Hal as well as new point of view for the reasonable design of low-cost AB hydrolysis catalyst.

Intermetallic Compounds Synthesized by Mechanical Alloying for Solid-State Hydrogen Storage: A Review

Hydrogen energy is a very attractive option in dealing with the existing energy crisis. For the development of a hydrogen energy economy, hydrogen storage technology must be improved to over the storage limitations. Compared with traditional hydrogen storage technology, the prospect of hydrogen storage materials is broader. Among all types of hydrogen storage materials, solid hydrogen storage materials are most promising and have the most safety security. Solid hydrogen storage materials include high surface area physical adsorption materials and interstitial and non-interstitial hydrides. Among them, interstitial hydrides, also called intermetallic hydrides, are hydrides formed by transition metals or their alloys. The main alloy types are A2B, AB, AB2, AB3, A2B7, AB5, and BCC. A is a hydride that easily forms metal (such as Ti, V, Zr, and Y), while B is a non-hydride forming metal (such as Cr, Mn, and Fe). The development of intermetallic compounds as hydrogen storage materials is very attractive because their volumetric capacity is much higher (80–160 kgH2m−3) than the gaseous storage method and the liquid storage method in a cryogenic tank (40 and 71 kgH2m−3). Additionally, for hydrogen absorption and desorption reactions, the environmental requirements are lower than that of physical adsorption materials (ultra-low temperature) and the simplicity of the procedure is higher than that of non-interstitial hydrogen storage materials (multiple steps and a complex catalyst). In addition, there are abundant raw materials and diverse ingredients. For the synthesis and optimization of intermetallic compounds, in addition to traditional melting methods, mechanical alloying is a very important synthesis method, which has a unique synthesis mechanism and advantages. This review focuses on the application of mechanical alloying methods in the field of solid hydrogen storage materials.

Ru Nanoparticles Immobilized on Chitosan as Effective Catalysts for Boosting NH3BH3 Hydrolysis

AbstractDeveloping an advanced heterogeneous catalyst is essential for realizing high‐performance ammonia borane (AB) hydrolysis, which is a safe and efficient way to generate hydrogen. In this work, a series of ruthenium (Ru) nanoparticles (NPs) immobilized on chitosan (CS) natural polymers are synthesized via an adsorption‐in situ reduction method. Various analytical techniques, including XRD, XPS, FT‐IR, SEM and TEM, are adopted to explore the structure‐catalytic performance relationships of the obtained catalysts for hydrolysis of AB. Benefitting from the possible interaction between Ru NPs and the amino and hydroxyl groups in CS, the as‐prepared catalysts exhibit excellent catalytic behavior for hydrogen generation from AB hydrolysis. Catalyzed by the optimal Ru/CS, the turnover frequency reaches up to 331.8 min−1 in NaOH solution at 303 K, and the corresponding apparent activation energy is 41.3 kJ mol−1, which are superior to many results previously reported. This work demonstrates that the obtained Ru/CS is a promising and efficient catalyst for the hydrolysis of solid hydrogen storage materials.

Construction of transition metal-decorated boron doped twin-graphene for hydrogen storage: A theoretical prediction

The exploitation of solid hydrogen storage materials is an essential part of the large-scale utilization of hydrogen energy. However, existing hydrogen storage materials cannot have both high hydrogen density and great stability at ambient temperature. Herein, we develop transition metal-decorated boron doped twin-graphene as a novel hydrogen storage material based on first-principles calculations. Ten different twin graphene adsorbents with Ti-decorated and doped with five boron atoms are examined. Metal decorating has a decisive influence on whether the twin graphene can be used for hydrogen storage. As the amount of boron atoms doping increases, the binding interaction between metal and substrate becomes more stable while the hydrogen adsorption strength weakens. The best structure can stably adsorb eight hydrogen molecules with a gravimetric density of 4.95 wt%. From thermodynamic calculations, the material is stable at reasonable conditions, e.g. 0.1 MPa, 238.5 K and 2.1 MPa, 298.15 K. Considering its outstanding hydrogen storage performance, we believe that Ti-decorated boron doped twin-graphene provides new inspirations to the discovery of carbon-based hydrogen storage materials.

Superior dehydrogenation performance of Mg-based alloy under electropulsing

As a feasible technological approach to promote the global energy transformation, hydrogen energy has gradually become a hot topic in the world's energy field. In order to solve the problem of the poor dehydrogenation kinetic performance in solid hydrogen storage materials, the effect of electropulsing treatment on the dehydrogenation kinetic performance of magnesium alloy was studied through the analysis of dehydrogenation amount, dehydrogenation rate, phase composition and microstructure. After electropulsing treatment, the initial dehydrogenation temperature was reduced by 39 °C, and the maximum dehydrogenation rate was increased from 7.48 wt.% H2/h to 14.36 wt.% H2/h. The electropulsing treatment provides a new idea and method for improving the dehydrogenation kinetic performance of hydrogen storage materials.