Single-Phase TiO2 Oxide for Hydrogen Storage via Low-Temp Synthesis
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Solution Overview
Problem
Conventional metal-based hydrogen storage materials exhibit low activity and poor hydrogen storage/release properties, and existing oxide-based materials often result in multi-phase rather than single-phase oxides, limiting their hydrogen storage performance.
Innovation Solution
A method for preparing a single-phase TiO2 crystal phase oxide for hydrogen storage by mixing and calcining vanadium oxide and titanium oxide, followed by impregnation with a noble metal precursor solution and heat treatment in a reducing atmosphere, reducing synthesis temperature from 1300°C or more to around 700°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid-phase synthesis process is used to prepare oxide for hydrogen storage, then hydrogen storage performance can be improved, but synthesis temperature must be 1300°C or more which increases energy consumption
Solution Approach 1:
The invention changes the synthesis temperature parameter from conventional 1300°C or higher down to 700°C, achieving single-phase TiO2 crystal phase oxide for hydrogen storage at lower temperature. This parameter change resolves the contradiction by maintaining hydrogen storage performance while significantly reducing energy consumption.
Solution Approach 2:
The invention uses a composite material system where V is substituted with Ti in VO2 to form V1-xTixO2. This composite approach enables single-phase formation at lower synthesis temperatures (700°C) compared to conventional solid-phase synthesis, thus improving energy efficiency while maintaining hydrogen storage performance.
2Quantity of substance
If conventional metal-based hydrogen storage materials are used, then large amounts of hydrogen can be stored through chemical bonding, but less than 100% of stored hydrogen is used and permanent bonding occurs making long-term use difficult
Solution Approach 1:
The invention changes from metal-based materials to oxide-based materials (V1-xTixO2), fundamentally altering the chemical properties. This parameter change enables reversible hydrogen storage without permanent bonding, improving reliability for long-term use while maintaining storage capacity.
Solution Approach 2:
The invention adopts oxide-based hydrogen storage mechanism as an alternative to metal-based hydrogen storage. By copying the successful hydrogen storage concept from metals but implementing it through oxides with different chemical properties, the invention achieves both high storage capacity and improved release performance.
3Reliability
If oxide-based materials are used instead of metal-based materials, then hydrogen storage activity and release properties can be improved, but multi-phase oxides are formed rather than single-phase which limits performance
Solution Approach 1:
The invention optimizes synthesis parameters (temperature: 700°C, composition: V1-xTixO2) to achieve single-phase TiO2 crystal phase formation. This precise parameter control ensures manufacturing precision in phase composition while maintaining high hydrogen storage activity.
Solution Approach 2:
The invention achieves uniform single-phase composition throughout the material by controlling the V substitution with Ti in VO2. This local quality control ensures consistent phase composition and structure, enabling reliable hydrogen storage performance.
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
This method enhances the reproducibility and efficiency of hydrogen storage/release performance, allowing for selective hydrogen introduction into crystal lattices and expanding the window for single-phase synthesis, while also being applicable to anode materials for solid oxide fuel cells.
Implementation Method 1
mixing and calcining vanadium oxide and titanium oxide
Implementation Method 2
synthesis process is performed at about 700° C., rather than an existing solid-phase synthesis process requiring a high synthesis temperature of about 1300° C. or more
Implementation Method 3
subjecting the oxide obtained in step b) to heat treatment in a reducing atmosphere
Data Source
AI summary
Disclosed is a method of preparing an oxide for hydrogen storage, including (a) mixing and calcining vanadium oxide and titanium oxide to provide an oxide, (b) impregnating the oxide obtained in step (a) with a noble metal precursor aqueous solution, and (c) subjecting the oxide obtained in step (b) to heat treatment in a reducing atmosphere, wherein the oxide obtained in step (a) has the composition of Chemical Formula (1) below and is composed of a single-phase TiO2 crystal phase:V1-xTixO2, Chemical Formula (1)where 0.05≤x≤0.95.