Copper-Based Heat Storage Material With Spinel Anti-Sintering Coating
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Solution Overview
Problem
Copper oxide particles suffer from agglomeration and sintering under high-temperature reaction conditions, leading to reduced re-oxidation degree, slow oxidation rate, and short cycle life, limiting their application in high-temperature heat storage materials.
Innovation Solution
A copper-based composite metal oxide heat storage material is formed by adhering spinel-type carriers to the surfaces of copper oxide particles, utilizing a sol-gel method to prepare spinel-type carriers and a high-temperature solid-state method to create a composite, which prevents agglomeration and sintering through strong interaction and uniform coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If copper oxide particles are used as heat storage material under high-temperature reaction conditions, then high energy density and fast reduction rate are achieved, but particle agglomeration and sintering occur leading to reduced surface area and short cycle life
Solution Approach 1:
Spinel-type carriers (MgCr2O4, ZnCr2O4, ZnAl2O4, or NiAl2O4) are introduced as intermediary substances that adhere to the surfaces of copper oxide particles. These carriers act as protective intermediaries that prevent direct contact and agglomeration between copper oxide particles during high-temperature reactions, while allowing the copper oxide to maintain its high energy density and fast reduction rate characteristics.
Solution Approach 2:
The invention creates a composite material system consisting of copper oxide particles combined with spinel-type carriers. This composite structure integrates the high energy density and fast reduction rate of copper oxide with the thermal stability and anti-agglomeration properties of spinel-type materials, resulting in a heat storage material that maintains excellent cyclic performance after multiple heat storage/release cycles.
2Temperature
If copper oxide particles are used under high-temperature conditions, then high heat storage temperature and energy density are achieved, but surface area reduction occurs due to agglomeration and sintering
Solution Approach 1:
Spinel-type carriers serve as intermediary protective layers on the copper oxide particle surfaces. These carriers have high melting points and stable crystal structures that prevent sintering and agglomeration of copper oxide particles even at high temperatures (800°C or more), thereby maintaining the specific surface area and enabling sustained high heat storage temperatures without surface area reduction.
Solution Approach 2:
The spinel-type carriers are selectively applied to the surfaces of copper oxide particles, creating a localized protective layer only where agglomeration occurs. This surface-modified approach preserves the bulk properties of copper oxide (high energy density, fast reduction rate) while locally preventing surface area loss through agglomeration and sintering.
3Use of energy by moving object
If copper oxide particles undergo multiple cycles of heat storage/release reactions, then high energy density is maintained, but oxidation reaction rate decreases due to particle densification
Solution Approach 1:
Spinel-type carriers act as protective intermediaries that prevent particle densification during multiple heat storage/release cycles. By adhering to the copper oxide particle surfaces, these carriers maintain porosity and prevent sintering, ensuring that the oxidation reaction rate remains fast even after numerous cycles while preserving the high energy density of the copper oxide system.
Solution Approach 2:
The spinel-type carriers are applied in sufficient quantities to ensure complete coverage of copper oxide particle surfaces. This excessive coating approach ensures that even with some carrier loss during cycling, the copper oxide particles remain protected from densification, maintaining both high energy density and fast oxidation reaction rates throughout the service life of the heat storage material.
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 composite material maintains a high heat storage and release density with improved re-oxidation degree and reaction rate, ensuring excellent cyclic performance even after multiple cycles.
Implementation Method 1
the spinel-type carriers in the copper-based composite metal oxide heat storage material provided in the present disclosure adhere to surfaces of the copper oxide particles
Implementation Method 2
A high-temperature thermochemical energy storage technology based on metal oxides (such as cobalt/manganese/copper/iron) realizes energy storage/release through reduction/oxidation reactions between metal oxides of different valencies
Implementation Method 3
utilizing a sol-gel method to prepare spinel-type carriers
Implementation Method 4
a high-temperature solid-state method to create a composite
Data Source
AI summary
A copper-based composite metal oxide heat storage material surface-coated with spinel-type structural carriers and a preparation method thereof, in which the spinel-type carrier material is prepared by using a sol-gel method, and then the copper-based composite metal oxide heat storage material is obtained by forming a composite of the spinel-type carriers and copper oxide through a high-temperature solid-state method. The spinel-type structural material has good high-temperature thermal stability and chemical stability, and the spinel-type structural material employed as carriers is coated on surfaces of the copper-based metal oxide to effectively improve the high-temperature sintering of the copper-based heat storage material, thereby improving re-oxidation degree (near 100%) and reaction rate of the copper-based composite metal oxide heat storage material, and has a superior cyclic heat storage/heat release performance.