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Hydrogen Bonds

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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...

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Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...

Hydroboration-Oxidation of Alkenes

Hydroboration-Oxidation of Alkenes

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Radical Formation: Homolysis

Radical Formation: Homolysis

A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.

Hybridization of Atomic Orbitals I

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...

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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions

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Published on: August 17, 2016

Electrolytic Hydrogen Release from Hydrogen Boride Sheets.

Satoshi Kawamura¹, Akira Yamaguchi¹, Keisuke Miyazaki¹

¹Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152-8552, Japan.

Small (Weinheim an Der Bergstrasse, Germany)

|February 1, 2024

Summary

Electrochemical hydrogen release from hydrogen boride (HB) sheets was achieved using a cathodic potential. This method offers a safe, lightweight, and economical way to release hydrogen, reaching over 90% efficiency.

Keywords:

hydrogen boride hydrogen release hydrogen storage nanosheet

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Published on: August 17, 2016

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Hydrogen Production and Utilization in a Membrane Reactor

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Published on: March 10, 2023

Area of Science:

Materials Science
Electrochemistry
Hydrogen Storage

Background:

Solid-state hydrogen storage materials offer safe and lightweight alternatives.
Hydrogen boride (HB) sheets have high gravimetric hydrogen capacity (8.5 wt%).
Current hydrogen release methods from HB sheets require high temperatures or UV illumination.

Purpose of the Study:

Investigate electrochemical hydrogen release from HB sheets.
Explore HB sheets as hydrogen carriers in a dispersion system.
Determine the efficiency and potential of electrochemical hydrogen release.

Main Methods:

Utilized a dispersion system of HB sheets in an organic solvent.
Applied cathodic potential for electrochemical hydrogen release.
Measured hydrogen release using electrochemical techniques.

Main Results:

Achieved electrochemical H2 release from HB sheets under cathodic potential.
Demonstrated >90% Faradaic efficiency for H2 release.
Observed an onset potential of -0.445 V vs Ag/Ag+, which is favorable compared to other proton sources.
Reached approximately 100% of the theoretical hydrogen capacity over extended experiments.

Conclusions:

Electrochemical H2 release from HB sheets is feasible and efficient.
HB sheets can serve as safe, lightweight, and economical hydrogen carriers.
The low bias required for H2 release enhances practical applicability.