Carbon-Coated Plastic Mesh Electrodes for Flow Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hybrid flow batteries, such as all-iron redox flow batteries, face efficiency and capacity limitations due to side reactions at the negative electrode, which consume electrons for hydrogen production instead of iron plating, leading to imbalanced electrolytes and capacity loss, and current electrode materials like titanium are expensive and contribute to these issues.
Innovation Solution
A cost-effective carbon-coated plastic mesh electrode is developed, which changes the surface properties from hydrophobic to hydrophilic, allowing effective purging of hydrogen bubbles and increasing the plating electrode area, reducing the need for expensive materials like titanium while maintaining or improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If titanium mesh is used as the negative electrode, then electrode stability is improved, but cost increases and side reactions worsen
Solution Approach 1:
The patent uses a composite structure consisting of a plastic mesh substrate coated with carbon material. This composite combines the structural stability of the mesh with the electrochemical activity and hydrophilic properties of carbon, achieving both stability and reduced side reactions without using expensive titanium.
Solution Approach 2:
The patent changes the surface properties of the electrode from hydrophobic to hydrophilic through carbon coating. This parameter change in surface wettability improves hydrogen bubble detachment and reduces the extent of side reactions while maintaining electrode stability.
2Reliability
If titanium mesh is used as the negative electrode, then electrode stability is improved, but cost increases
Solution Approach 1:
The patent replaces expensive titanium mesh with a cheaper plastic mesh substrate. Although plastic is less inherently stable, the carbon coating restores stability and performance, achieving a cost-effective solution that maintains electrode functionality without using precious materials.
Solution Approach 2:
The composite of plastic mesh and carbon coating provides a low-cost alternative to titanium while maintaining the necessary stability and electrochemical performance through the synergistic combination of materials.
3Ease of manufacture
If hydrophobic surface is used, then manufacturing is simpler, but hydrogen bubble purging worsens
Solution Approach 1:
The patent modifies the surface energy parameter of the electrode from hydrophobic to hydrophilic through carbon coating. This change improves the contact angle and surface wettability, enabling hydrogen bubbles to detach more easily and improving battery performance without significantly complicating manufacturing.
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 carbon-coated plastic mesh electrode reduces costs, maintains or enhances battery performance by minimizing side reactions, and effectively manages hydrogen bubble purging, thereby improving the overall efficiency and capacity of hybrid flow batteries.
Implementation Method 1
changes the surface properties from hydrophobic to hydrophilic
Implementation Method 2
the ferrous (Fe2+) ion gains electrons and plates as solid iron on the substrates during charge
Implementation Method 3
the solid iron dissolves as ferrous ions and releases two electrons during discharge
Implementation Method 4
the redox reaction between ferrous and ferric (Fe3+) ions occurs during charge and discharge
Data Source
AI summary
An electrode for use in an all-iron redox flow battery is provided. In one example, the electrode may include a plastic mesh; and a coating on the plastic mesh. The coating may be a hydrophilic coating or a conductive coating and the electrode may have an electrode reaction potential is less than 0.8V. Further, a method of manufacturing a coated plastic mesh electrode for use in an all-iron redox flow battery is provided. In one example method, the steps include fabricating a plastic mesh, treating the plastic mesh by applying a solvent treatment or a plasma treatment or a mechanical abrasion treatment; coating the plastic mesh with a material selected from: carbon inks, metal oxides, and hydrophilic polymers.