Related Experiment Video
Updated: Mar 12, 2026
07:50
Hydrogen Charging of Aluminum using Friction in Water
Published on: January 28, 2020
6.6K
Superior hydrogen storage in high entropy alloys
Martin Sahlberg1, Dennis Karlsson1, Claudia Zlotea2
1Department of Chemistry - Ångström Laboratory, Uppsala University, Box 523, SE-75120 Uppsala, Sweden.
Scientific Reports
|November 11, 2016
Summary
High entropy alloys offer superior hydrogen storage capacity. A novel TiVZrNbHf alloy achieved a record H/M ratio of 2.5, surpassing traditional metal hydrides for future energy systems.
Area of Science:
- Materials Science
- Hydrogen Storage Technologies
- Alloy Development
Background:
- Metal hydrides (MHx) are crucial for hydrogen storage in future energy systems.
- Current transition metal hydrides have limited hydrogen absorption capacity (H/M ratio ≤ 2).
- Higher H/M ratios are typically found only in rare-earth based alloys.
Purpose of the Study:
- To investigate the hydrogen absorption capacity of a novel high entropy alloy (HEA).
- To determine if HEAs can exceed the H/M ratio limitations of traditional metal hydrides.
- To explore the potential of HEAs for advanced hydrogen storage applications.
Main Methods:
- Synthesis and characterization of a TiVZrNbHf high entropy alloy.
- Hydrogen absorption testing to determine the H/M ratio.
- Analysis of alloy structure and interstitial site occupancy.
Main Results:
- The TiVZrNbHf HEA demonstrated significantly higher hydrogen absorption than its constituent elements.
- An unprecedented H/M ratio of 2.5 was achieved.
- Lattice strain in the HEA was identified as a key factor enabling high hydrogen uptake.
Conclusions:
- High entropy alloys show great promise for exceeding current hydrogen storage limits.
- The TiVZrNbHf alloy represents a breakthrough in achieving high H/M ratios.
- This study highlights the potential of HEAs in developing next-generation hydrogen storage materials.
Related Concept Videos
01:04Hydrogen Bonds
15.7K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
15.7K
00:26Hydrogen Bonds
135.9K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
135.9K
03:40Hess's Law
56.7K
There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
56.7K
02:37Metallic Solids
21.2K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
21.2K
02:45Nuclear Fusion
34.2K
The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
34.2K
02:59Enthalpy
49.1K
Chemists ordinarily use a property known as enthalpy (H) to describe the thermodynamics of chemical and physical processes. Enthalpy is defined as the sum of a system’s internal energy (E) and the mathematical product of its pressure (P) and volume (V):
49.1K