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Electric field enhanced hydrogen storage on polarizable materials substrates
1Department of Advanced Materials and Nanotechnology, and Center for Applied Physics and Technology, Peking University, Beijing 100871, China.
Summary
An applied electric field enhances hydrogen storage on polarizable nanomaterials. This novel method allows for reversible hydrogen storage with fast kinetics, meeting Department of Energy targets.
Area of Science:
- Materials Science
- Physical Chemistry
- Nanotechnology
Background:
- Hydrogen storage is critical for clean energy technologies.
- Developing efficient and reversible hydrogen storage materials remains a significant challenge.
- Existing methods often struggle with capacity, kinetics, or reversibility.
Purpose of the Study:
- To investigate the effect of applied electric fields on hydrogen storage properties of polarizable substrates.
- To demonstrate a novel concept for enhancing hydrogen adsorption and enabling reversible storage.
- To identify material characteristics that facilitate efficient electric-field-assisted hydrogen storage.
Main Methods:
- Density Functional Theory (DFT) calculations were employed.
- Simulations involved adsorbing hydrogen molecules onto various nanomaterials (BN, AlN, silsesquioxane).
- The impact of applied electric fields on binding energies and storage densities was analyzed.
Main Results:
- Applied electric fields significantly increased hydrogen binding energy on polarizable substrates.
- A BN sheet showed a binding energy increase from 0.03 to 0.14 eV/H(2) with an electric field.
- Achieved gravimetric density of 7.5 wt% meets Department of Energy 2010 targets.
- More polarizable substrates like AlN, silsesquioxane molecules, and sheets required weaker fields for similar enhancement.
Conclusions:
- Applying an electric field to polarizable substrates offers a novel and effective strategy for hydrogen storage.
- The electric field-induced adsorption is reversible upon removal of the field, ensuring fast kinetics.
- Materials rich in low-coordinated nonmetal anions are highly polarizable and promising for designing new hydrogen storage solutions.
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