Porous Solid Electrolyte Electrosynthesis Cell for Pure H2O2 Production
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Solution Overview
Problem
The direct synthesis of hydrogen peroxide (H2O2) from hydrogen (H2) and oxygen (O2) faces challenges due to the hazards associated with mixing high-pressure H2 and O2, requiring heavy dilution which lowers yields, and existing electrosynthesis methods suffer from low reaction rates and product concentrations.
Innovation Solution
A porous solid electrolyte electrosynthesis cell is employed, comprising a cathodic catalyst, an anodic catalyst, ion exchange membranes, and a solid electrolyte, allowing for the direct electrosynthesis of high purity H2O2 by decoupling the H2/O2 redox reactions into two half-cell reactions, optimizing catalysts for each reaction, and using a porous solid electrolyte design to separate and recombine ions for pure product formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If H2 and O2 are mixed at high pressure for direct synthesis, then reaction rate improves, but safety hazards increase
Solution Approach 1:
The patent divides the single direct synthesis reaction into two separate half-cell reactions: oxygen reduction at the cathode and hydrogen oxidation at the anode. This segmentation allows H2 and O2 to be completely separated in space, eliminating safety hazards while maintaining high reaction rates through optimized electrocatalysts in each compartment.
Solution Approach 2:
The patent introduces an ion-exchange membrane as an intermediary between the two half-cells. This membrane allows selective ion transport (H+ or OH-) to maintain charge balance while physically separating H2 and O2 gases, enabling high-rate reactions without direct gas mixing and associated safety risks.
2Object-affected harmful factors
If H2 is diluted using carrier gas to reduce safety hazards, then safety improves, but H2O2 yield decreases
Solution Approach 1:
By segmenting the reaction into separate half-cells, the patent eliminates the need for H2 dilution with carrier gases. Pure H2 can be fed to the anode at high concentrations without safety concerns, as it is physically separated from O2, thereby maximizing H2O2 yield while maintaining safety.
3Productivity
If traditional liquid electrolytes are used for electrosynthesis, then reaction rate improves, but product purity decreases
Solution Approach 1:
The patent extracts the ions (H+ or OH-) from the reaction products through the ion-exchange membrane, separating them from the H2O2 product solution. This allows the use of traditional liquid electrolytes for high reaction rates while obtaining pure H2O2 in the product compartment, eliminating the need for additional purification steps.
Solution Approach 2:
The ion-exchange membrane acts as an intermediary that selectively transports ions while blocking H2O2 molecules. This enables the use of conductive liquid electrolytes for high reaction rates while preventing electrolyte components from contaminating the H2O2 product, thus maintaining high product purity.
4Manufacturing precision
If deionized water or polymer electrolyte membrane is used, then product purity improves, but reaction rate decreases
Solution Approach 1:
The patent uses an ion-exchange membrane as an intermediary that provides ionic conductivity for high reaction rates while physically separating the electrolyte from the product. This allows the use of deionized water or polymer electrolyte membranes to maintain product purity while the membrane itself facilitates ion transport to sustain high reaction rates.
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 approach enables high purity and concentrated H2O2 production without safety hazards, achieving high selectivity and productivity, and can be scaled up with minimal performance sacrifice, producing solutions up to 20 wt.% H2O2 without additional purification steps.
Implementation Method 1
a porous solid electrolyte design is used to realize the direct electrosynthesis of pure H2O2... ion exchange membranes... wherein the solid electrolyte compartment is separated from the cathode and the anode by the anion exchange membrane and/or the cation exchange membrane
Implementation Method 2
cathode electrode comprising a gas diffusion layer loaded with a selective reduction reaction electrocatalyst... anode electrode comprising a gas diffusion layer loaded with a catalyst for oxidation reactions
Implementation Method 3
decouple the H2/O2 redox into two half-cell reactions... 2e−-O2 reduction reaction (2e−-ORR)... H2 (HOR)
Implementation Method 4
a cation exchange membrane; and an anion exchange membrane; wherein the solid electrolyte compartment is separated from the cathode and the anode by the anion exchange membrane and/or the cation exchange membrane
Data Source
AI summary
A porous solid electrolyte electrosynthesis cell and corresponding related process for the direct synthesis of high purity liquid products wherein the electrosynthesis cell comprises a cathode compartment including a cathode electrode comprising a gas diffusion layer loaded with a selective reduction reaction electrocatalyst for specific reduction reactions. The electrosynthesis cell further includes an anode compartment including an anode electrode comprising a gas diffusion layer loaded with a catalyst for oxidation reactions; and a solid electrolyte compartment comprising a porous solid electrolyte; a cation exchange membrane; and an anion exchange membrane; (or two cation exchange membranes) wherein the solid electrolyte compartment is separated from the cathode and the anode by the anion exchange membrane and the cation exchange membrane (or by the two cation exchange membranes).