Hydrogen storage biochar, and preparation method and application thereof

By optimizing the pore structure of biochar through air-atmosphere pre-carbonization and hydrothermal loading of nitrogen and calcium dopants, the problem of insufficient hydrogen storage performance of carbon-based hydrogen storage materials at low temperature and ambient pressure was solved, and high-quality biochar with high hydrogen storage density was prepared, which is suitable for industrial applications.

CN121292431BActive Publication Date: 2026-07-21ZHEJIANG UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Filing Date
2025-11-06
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing carbon-based hydrogen storage materials have a hydrogen storage performance of less than 3 wt.% at low temperature and normal pressure, failing to meet the International Energy Agency's target of 5.5 wt.%, and there is an urgent need to develop modification processes to achieve high-quality hydrogen storage density.

Method used

Hydrogen storage biochar was prepared by pre-carbonizing in air atmosphere combined with KOH activation and loading nitrogen and calcium dopants via hydrothermal method to optimize the pore structure and anchoring points of biochar.

Benefits of technology

The hydrogen storage biochar prepared under low temperature and normal pressure has a hydrogen storage density of 3.24 wt.%, which significantly improves the hydrogen storage performance. Moreover, the raw materials are widely available and inexpensive, making it suitable for industrial-scale production.

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Abstract

The application discloses a hydrogen storage biochar as well as a preparation method and application thereof. The preparation method of the hydrogen storage biochar is as follows: taking a biomass precursor, air carbonizing the biomass precursor to obtain an air carbonized precursor; uniformly mixing the air carbonized precursor with KOH in proportion, keeping temperature rising under a nitrogen atmosphere, and naturally cooling to room temperature; dispersing the obtained product in deionized water, and adding a nitrogen calcium dopant; adding the obtained mixed solution into a hydrothermal reaction kettle to react, cleaning and drying the product, and thus the hydrogen storage biochar is obtained. Through the first step of the air atmosphere pre-carbonization process, the activation resistance of the biomass to KOH is improved, meanwhile, the nitrogen doping process is optimized, the anchor N element and Ca element are loaded by using the hydrothermal method, the N dopant is used as an anchor point to promote the loading of Ca, the reaction condition is mild, the structure of the raw material is not damaged, and the hydrogen storage performance of the biochar is significantly improved.
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