Protonated Imine-Linked COFs for Stable Hydrogen Storage

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Solution Overview

Problem

Current hydrogen storage materials face challenges in achieving high hydrogen storage capacity and stability due to issues with pore structure collapse and low adsorption heat, particularly in covalent organic frameworks (COFs) with high specific surface areas.

Innovation Solution

Protonation of imine-linked COFs using hydrochloric acid vapor to enhance adsorption heat at imine sites, improving hydrogen storage capacity without compromising structural integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If covalent organic framework materials with high specific surface area are used for hydrogen storage, then hydrogen storage capacity is improved, but pore structure stability deteriorates due to framework collapse

Engineering Contradiction:

Improvehydrogen storage capacityVSAvoidpore structure stability

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The patent applies parameter changes by protonating the imine bonds in COF materials through treatment with hydrochloric acid vapor or aqueous solution. This chemical modification changes the electronic and structural parameters of the framework, enhancing the hydrogen adsorption capacity while simultaneously improving the structural stability of the pore system, thus resolving the contradiction between high storage capacity and structural stability.

Inventive Principle:

Principle #35Parameter changes

2Speed

If physisorption is used for hydrogen storage, then adsorption and desorption speeds are improved, but adsorption heat is insufficient leading to lower storage capacity

Engineering Contradiction:

Improveadsorption and desorption speedVSAvoidhydrogen storage capacity

Core Design Contradiction:

SpeedVSQuantity of substance

Solution Approach 1:

The patent modifies the adsorption parameters of COF materials through protonation of imine bonds. This chemical modification optimizes the adsorption heat parameter while preserving the physisorption mechanism, thereby increasing hydrogen storage capacity without sacrificing the rapid adsorption and desorption kinetics characteristic of physisorption processes.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The protonation method significantly enhances hydrogen storage capacity and adsorption performance of COFs, making them suitable for industrial applications and overcoming limitations of existing COFs.

Implementation Method 1

protonation of imine-linked COFs using hydrochloric acid vapor to enhance adsorption heat at imine sites

Methodology Applied

Scientific EffectProtonation:

Implementation Method 2

Adsorption is a phenomenon in which a gas partially retained upon contact with a solid. It is divided into two major categories: chemisorption and physisorption

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS20250282906A1Protonated Covalent Organic Framework Material and Preparation Method and Use Thereof

Publication Date: 2025.09.11 BEIJING VFORTUNE NEW ENERGY POWER TECH DEV CO LTD

AI summary

The disclosure provides a method for improving hydrogen adsorption performance of a covalent organic framework material, including the following steps: providing a covalent organic framework material including an imine bond; and placing the covalent organic framework material in hydrochloric acid vapor for protonation. The disclosure further provides a protonated covalent organic framework material, and use thereof as a hydrogen storage medium.