Photoelectrochemical Flow Battery Desalination for High-Salt Ion Removal
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Solution Overview
Problem
Conventional desalination technologies face challenges with high energy consumption, limited ion removal capacity, and environmental sustainability, particularly in handling high-concentration salt feeds and anion electrochemical materials instability in aqueous electrolytes.
Innovation Solution
A flow battery system utilizing organic and inorganic materials as positive and negative electrodes, with a salt solution as the electrolyte, and anion and cation exchange membranes for continuous low-energy desalination, enhanced by photo-electrochemical catalysis using photosensitive semiconductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional desalination technologies (reverse osmosis, electrodialysis, thermal distillation) are used, then ion removal capability is achieved, but energy consumption and operating costs increase significantly
Solution Approach 1:
The patent changes the fundamental mechanism from physical/thermal processes to electrochemical reactions. By using redox-active materials that can reversibly store and release ions through chemical reactions, the system eliminates the need for high-pressure pumps and heating systems, dramatically reducing energy consumption while maintaining effective ion removal capability
Solution Approach 2:
The patent replaces mechanical desalination systems (reverse osmosis requiring high-pressure pumps) and thermal systems (distillation requiring heating equipment) with an electrochemical system based on battery reactions. The ion removal is achieved through electrochemical storage and release mechanisms rather than mechanical forcing or thermal driving, fundamentally substituting the energy-intensive mechanical/thermal approaches
2Use of energy by moving object
If capacitive deionization (CDI) technology is used, then energy consumption is reduced, but ion removal capacity is limited for high-concentration salt feeds
Solution Approach 1:
The patent employs composite electrode materials combining conductive matrices with redox-active components. These composite structures provide both the electrical conductivity needed for electrochemical reactions and the high ion-trapping capacity required for concentrated salt solutions, overcoming the limitations of simple capacitive electrodes
Solution Approach 2:
The patent transitions from capacitive storage (electrostatic) to battery-based storage (electrochemical). By changing the fundamental storage mechanism from electrical double-layer capacitance to faradaic redox reactions, the system achieves much higher ion capacity suitable for concentrated brines while maintaining low energy consumption through reversible reactions
3Quantity of substance
If anion electrochemical energy storage technology is developed, then ion trapping capability increases, but electrode material stability decreases in aqueous electrolyte solutions
Solution Approach 1:
The patent employs organic redox-active materials that can be readily synthesized and replaced. These materials offer high ion-trapping capability through reversible redox reactions, and when stability issues arise, the electrodes can be economically replaced rather than requiring complex protective systems
Solution Approach 2:
The patent uses composite electrode structures combining organic redox-active materials with stable conductive matrices or supportive frameworks. This composite approach allows the unstable but high-capacity organic materials to function effectively while the stable matrix provides structural integrity and electrical conductivity, resolving the stability-capacity trade-off
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
Achieves high specific capacity, low energy consumption, and effective ion removal, including both cations and anions, with sustainable and cost-effective desalination suitable for seawater and industrial wastewater treatment.
Implementation Method 1
utilizing light to realize electrical energy conversion in an external circuit and electrochemical catalysis in an internal circuit for continuous desalination
Implementation Method 2
electrochemical deionization, and specifically relates to an ion removal device based on electrochemistry and photo-electrochemistry
Implementation Method 3
anion and cation exchange membranes for continuous low-energy desalination
Data Source
AI summary
An ion removal device based on electrochemical and photoelectrochemical methods, and the application of energy conversion and storage are provided. In the ion removal process based on the electrochemical and photoelectrochemical fluidization battery device, the positive active material in the flow battery is the positive pole of device, the negative active material in the fluid battery is the negative pole of the device, and the salt solution is the electrolyte in the middle stream. The positive and negative active materials include organic materials such as 4-hydroxy-piperidinol oxide, riboflavin sodium phosphate or methyl viologen, which have the advantages of low raw material cost, environmental friendliness, high sustainability, excellent electrochemical performance, high specific capacity and good cycle stability etc. The electrolyte can be separated from the positive and negative active liquid flow materials according to the fixed sequence of self-assembly of fluid battery mold.