Rare earth (RE) elements possess electronic configurations that can provide additional pathways for tailoring the electronic structures of active elements through alloying, making it an important area of exploration in electrocatalysis. However, the large negative redox potential between RE and Pt has hindered the development of RE …
Role of Rare-Earth Alloys in Lithium Borohydride Regeneration …
Lithium borohydride (LiBH4) is a promising hydrogen storage material, but the irreversibility of hydrolysis and the high cost of regeneration have severely restrained its commercial applications. Herein, we reported a cost-effective method to regenerate LiBH4 by ball milling hydrous lithium metaborate (LiBO2·2H2O) with low-cost Mg-based alloys, …
Carbon coating with different carbon sources on rare earth …
The rare earth hydrogen storage alloy was coated with the same contents of carbon particles using sucrose, glucose, pitch, and chitosan as carbon sources, and compared with the samples of uncoated and mechanically mixed with the carbon powder. The results show that the maximum discharge capacity (C max), high-rate …
Effects of rare earth elements substitution for Ti on the structure …
Effects of a partial substitution of rare-earth elements of Y, La, Ce, Pr, Nd in an atom fraction of 1/8 for Ti on the structure and electrochemical property of a Fe-doped Ti–V-based hydrogen storage alloy, Ti 0.8 Zr 0.2 V 2.7 Mn 0.5 Cr 0.6 Ni 1.25 Fe 0.2, have been investigated systematically using X-ray diffraction, scanning electron microscope, …
Rare-earth-based alloy electrodes for a nickel-metal hydride battery
However, the literature in energy engineering shows that when rare earth elements are added to the alloy, the hydrogen absorption process is significantly accelerated. So, rare earth elements are widely used in various types of hydrogen storage devices as well as in ...
Microstructure and mechanical properties synergistically …
2 · A recent study by Wu et al. [11, 13] found that the activation energy required for conical dislocation cross-slip shift (∆Gxs) is lower when rare-earth elements are solidly …
Rare earth–Mg–Ni-based hydrogen storage alloys as negative …
AB 5-type rare earth-based alloys have been successfully used ... hydrogen storage alloys with high energy densities and that are used as negative electrode materials in Ni/MH batteries. ... of the alloy surface. Additionally, the incorporation of La 2 O 3 /C reduced the apparent activation enthalpy (ΔrH*) for charge transfer on the alloy ...
Advances in hydrogen storage with metal hydrides: Mechanisms, …
The Earth''s crust contains a lot of rare-earth elements. The storage capacity of hydrogen is also significantly more influenced by rare earth elements. These alloys are producing a higher capacity compared to AB 5 alloy. Nd and Pr are examples of rare-earth elements that can be substituted to improve an alloy''s activation …
Research progress and development tendency on storage
Sustainable clean energy is gradually replacing traditional fossil energy sources in important industrial applications and is placing higher demands on the technologies of energy storage and transportation. The development of multi-principal element alloys (MPEAs) offers a new idea for safe solid-state hydrogen storage …
Improvement in cyclic stability of rare-earth-based hydrogen storage ...
Recently, twin-roller rapid quenching process has been developed to prepare rare-earth-based alloys with a homogenous nanocrystalline structure [3]. An AB 5-type hydrogen storage alloy with a uniform crystalline size of about 40 nm can be attained. Its initial discharge capacity of the alloy is high, up to 312 mAh g −1 at 640 mA g −1. It ...
Synthesis of Pt–Rare Earth Metal Nanoalloys | Journal of the …
Chemical synthesis of platinum–rare earth metal (Pt–RE) nanoalloys, one of the most active catalysts for the oxygen reduction reaction, has been a formidable challenge, mainly due to the vastly different standard reduction potentials of the two metals and high oxophilicity of the latter. Here we report a universal chemical process to prepare …
Research progress of hydrogen energy and metal hydrogen storage …
TiFe alloy is a typical AB type hydrogen storage alloy, which can store hydrogen at room temperature, and lower hydrogen pressure. The theoretical specific capacity of TiFe alloy is 1.9 wt%, that is significantly higher than AB 5 …
This review is devoted to new rare earth–Mg–Ni-based (R–Mg–Ni-based) hydrogen storage alloys that have been developed over the last decade as the most promising next generation negative electrode materials for high energy and high power Ni/MH batteries.
Study on Hydrogen in Mixed Gas Separated by Rare Earth Hydrogen Storage ...
AB 5-type rare-earth nickel (RE-Ni) based hydrogen storage alloys and AB 3-type La-Mg-Ni based hydrogen storage alloys were prepared by vacuum medium-frequency induction melting in argon atmosphere dustrial offgas was simulated by the mixed gas including H 2, N 2 and CH 4.The purity of hydrogen separated by rare-earth …
Rare earth incorporated electrode materials for advanced energy …
This review presents current research on electrode material incorporated with rare earth elements in advanced energy storage systems such as Li/Na ion battery, Li-sulfur battery, supercapacitor, rechargeable Ni/Zn battery, and cerium based redox flow …
Universal and Energy-Efficient Approach to Synthesize Pt-Rare Earth Metal Alloys …
Traditional synthesis methods of platinum-rare earth metal (Pt-RE) alloys usually involve harsh conditions and high energy consumption because of the low standard reduction potentials and high oxophilicity of RE metals. In this work, a one-step strategy is ...
Rare Earth Hydrides and Hydrogen Storage Alloys | SpringerLink
The performance of hydrogen storage materials in AB 5 rare earth systems can be enhances by A and B composition optimization, i.e., (1) Optimization of A side (rare earth) components in AB 5 alloys. (2) Optimization of B side elements in AB 5 alloys. The characteristics of some rare earth hydrides are summarized in a table.
Ultrahigh energy storage density in lead-free antiferroelectric …
Here, using a rst-principle-based method, it is predicted that rare-earth substitution of varied ele- ments and composition can systematically tune the stability of the antiferroelectric …
Rare-earth–platinum alloy nanoparticles in mesoporous zeolite for catalysis | Nature
Pt alloy formation with rare-earth elements through the H2 reduction route is almost ... PtY/mz-deGa showed a notable shift in edge energy and white-line region to higher energy compared to the ...
Dislocation pile-ups at β1 precipitate interfaces in Mg-rare earth (RE) alloys …
Magnesium alloys containing rare earth (RE) additions are of interest because of their excellent age hardening response, high creep resistance and good castability [1], [2], [3]. Mg-RE alloys such as Mg-Nd, Mg-Nd-Y, Mg-Gd, and Mg-Gd-Y share a similar precipitation sequence starting from supersaturated solid solution and …
Design of Hydrogen Storage Alloys/Nanoporous Metals Hybrid …
Recently, with increasing pressures of environmental problems and energy crisis, more and more sights have turned to new-energy vehicles 1,2,3.A series of advanced battery technologies have been ...
Nickel/metal hydride batteries using rare-earth hydrogen storage …
The battery using the bare alloy was less stable compared to the coated alloy due to the role of the coated nickel as an oxygen barrier for protecting the alloy surface from …
Zero-Carbon Service Area Scheme of Wind Power Solar Energy Storage ...
Among them, the use of wind power photovoltaic energy storage charging pile scheme has realized the low carbon power supply of the whole service area and ensured the use of 50% green power. At the same time, through the purchase of green electricity and other means, gradually achieve 100% green electricity. ...
Rare earth alloy nanomaterials in electrocatalysis
In RE alloys, the electric charge transferred by atoms through metal bonding changes the overall electronic structure and catalytic performance of the catalyst. ... His main-interest is the synthesis of rare earth nano-alloy catalysts and their application in electrocatalysis. ... Utilizing hybrid faradaic mechanism via catalytic and surface ...
Hydrogen solubility in rare earth based hydrogen storage alloys
1. IntroductionNi–H batteries provide the basis for a new class of secondary batteries with large energy capacity. The LaNi 5 hydrogen storage alloys (in most cases mish-metals are used instead of pure La because of the economical reason), have recently made a significant impact on the battery industry, largely due to their high hydrogen …
Effect of rare earth (RE) elements on V-based hydrogen storage alloys ...
As is mentioned that V absorbs little hydrogen under room temperature. That is because the free-energy (Δ G) of VH 2 is a positive value at 298 K (as seen in Table 4), which indicates that the reaction between V and hydrogen could not happen at such temperature.However, the free-energy value of REH x (RE = La, Pr or Ce) is rather low, …
