Cyclodextrin-Modified Phenazine Electrolyte for Stable Alkaline AORFBs
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Solution Overview
Problem
Existing phenazine-based alkaline aqueous organic redox flow batteries face challenges in low practical utilization efficiency, poor rate performance, and high synthesis costs, with phenonaphthazine (BHPC) needing further improvements in stability and efficiency for large-scale applications.
Innovation Solution
Incorporating a polyhydroxy cyclic supramolecule, such as cyclodextrin, into the phenazine-based electrolyte to enhance reaction kinetics and stability, using a concentration ratio of 1:(0.1-0.5) for phenazine:cyclodextrin, with concentrations of 0.05-0.3 mol/L for phenazine and 0.01-0.3 mol/L for cyclodextrin, to form a hydrogen bond and improve redox processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If phenazine-based organic compounds are used as active molecules in alkaline AORFBs, then cost-effectiveness and eco-friendliness are improved, but practical utilization efficiency and rate performance deteriorate due to poor reaction kinetics
Solution Approach 1:
The patent introduces a polyhydroxy cyclic supramolecule as an intermediary substance that mediates between the phenazine-based organic compound and the electrolyte. This mediator enhances the reaction kinetics by facilitating electron transfer and improving the interaction between the organic active molecule and the aqueous alkaline electrolyte, thereby resolving the contradiction between cost-effectiveness and practical utilization efficiency.
Solution Approach 2:
The patent modifies the physicochemical parameters of the phenazine-based organic compound through molecular design, including adjusting solubility, stability, and reaction kinetics parameters. By optimizing these parameters, the patent achieves both cost-effectiveness and high practical utilization efficiency in alkaline AORFBs.
2Stability of the object's composition
If molecular design and synthesis engineering are used to improve solubility and stability of phenazine compounds, then stability is improved, but reaction kinetics and rate performance are neglected resulting in poor utilization efficiency
Solution Approach 1:
The patent simultaneously optimizes multiple parameters including solubility, stability, and reaction kinetics through molecular design. By adjusting molecular structure parameters and conducting comprehensive optimization, the patent achieves high stability while maintaining excellent rate performance and utilization efficiency.
Solution Approach 2:
The patent creates a composite electrolyte system combining phenazine-based organic compounds with polyhydroxy cyclic supramolecules. This composite approach allows the system to benefit from both the stability of the phenazine compound and the kinetic-enhancing properties of the supramolecule, resolving the contradiction between stability and rate performance.
3Device complexity
If BHPC is used as phenazine active molecule with limited molecular modification potential, then structural simplicity is maintained, but utilization efficiency, rate performance, energy efficiency, and stability need great improvement
Solution Approach 1:
The patent introduces polyhydroxy cyclic supramolecules as intermediaries that work with BHPC to enhance utilization efficiency, rate performance, and stability. This mediator approach allows BHPC to maintain its structural simplicity while achieving high performance through the synergistic interaction with the supramolecule.
Solution Approach 2:
The patent creates a composite system combining BHPC with polyhydroxy cyclic supramolecules. This composite approach enables the simple BHPC structure to achieve high utilization efficiency and stability through the complementary properties of the supramolecule, without requiring complex molecular modification of BHPC itself.
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 electrolyte achieves high capacity utilization efficiency (>95%), prominent rate performance, and high energy efficiency (>80%) with enhanced stability (less than 0.02% capacity attenuation per day) in alkaline AORFBs, making it cost-effective for large-scale energy storage.
Implementation Method 1
using a concentration ratio of 1:(0.1-0.5) for phenazine:cyclodextrin, with concentrations of 0.05-0.3 mol/L for phenazine and 0.01-0.3 mol/L for cyclodextrin, to form a hydrogen bond and improve redox processes
Implementation Method 2
Redox flow batteries (RFBs) can store a large amount of energy in electrolytes
Data Source
AI summary
The present disclosure provides an ultra-high stability phenazine-based electrolyte for an alkaline aqueous organic redox flow battery (AORFB), and a flow battery, and belongs to the technical field of electrochemical energy storage. The electrolyte includes a cyclic supramolecule with a rigid polyhydroxy conical cavity structure that is hydrophobic internally and hydrophilic externally, a phenazine-based organic compound, and an alkaline aqueous solution. The cyclic supramolecule is a cyclodextrin or a derivative thereof. The cyclodextrin or the derivative thereof can improve the reaction kinetics of the phenazine-based organic compound and enhance the utilization and stability. The electrolyte has the advantages of easy availability of raw materials, easy operations, and low cost, and can be used to produce alkaline AORFBs with small polarization, high capacity utilization efficiency, prominent rate performance, high energy efficiency, and excellent stability.