Cathode Catalyst Layer Water Repellent for Organic Hydride Production

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional organic hydride producing devices have a low Faraday efficiency, which limits the effectiveness of hydrogenation reactions.

Innovation Solution

A cathode catalyst layer with a water repellent containing aggregates of primary particles is used, having a higher affinity for the substance to be hydrogenated and the organic hydride than for water, with a volume fraction of the water repellent exceeding 10 vol % in the cathode catalyst layer, enhancing the Faraday efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional cathode catalyst layer is used, then the device structure is simple, but the Faraday efficiency is low due to water competing with the substance to be hydrogenated

Engineering Contradiction:

ImproveFaraday efficiencyVSAvoidcathode catalyst layer composition

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The cathode catalyst layer is designed with spatially differentiated properties by incorporating water repellent particles with specific contact angles (greater than 90 degrees) dispersed within the catalyst matrix. This creates local hydrophobic regions that preferentially attract and concentrate the substance to be hydrogenated and organic hydride while repelling water, thereby improving Faraday efficiency without fundamentally changing the overall layer structure

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The cathode catalyst layer is constructed as a composite material system combining catalyst particles, water repellent particles (such as PTFE), and binder materials. This composite structure leverages the hydrophobic properties of the water repellent particles to create a microenvironment that favors the hydrogenation reaction by excluding water, thus resolving the contradiction between simplicity and efficiency

Inventive Principle:

Principle #40Composite materials

2Reliability

If the volume fraction of water repellent is increased to improve Faraday efficiency, then side reactions are reduced, but the conductivity of the cathode catalyst layer may deteriorate

Engineering Contradiction:

ImproveFaraday efficiencyVSAvoidconductivity

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The volume fraction of water repellent particles is optimized within a specific range (1-50 vol%, preferably 5-30 vol%) to balance hydrophobic effect and electrical conductivity. Additionally, the particle size of water repellent is controlled (0.1-10 micrometers) to maximize surface area for water repulsion while maintaining adequate conductive pathways. These parameter optimizations allow achieving high Faraday efficiency without excessive conductivity loss

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The water repellent particles are dispersed throughout the cathode catalyst layer to create localized hydrophobic zones rather than forming a continuous barrier. This localized approach allows water to be repelled at the molecular level near catalyst sites while maintaining overall layer conductivity through the catalyst and binder network, thus resolving the contradiction between efficiency improvement and conductivity maintenance

Inventive Principle:

Principle #3Local quality

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 increased volume fraction of the water repellent improves Faraday efficiency, reducing side reactions and maintaining conductivity, leading to more efficient organic hydride production.

Implementation Method 1

a water repellent including an aggregate of arbitrary primary particles, the water repellent having a higher affinity for the substance to be hydrogenated and the organic hydride than for water

Methodology Applied

Scientific EffectHydrophobic effect: Hydrophobe

Implementation Method 2

an electrolyte membrane having a first surface and a second surface facing away from each other and transporting a proton

Methodology Applied

Scientific EffectProton conduction: Conduction (electrical)

Implementation Method 3

an anode provided on the second surface side of the electrolyte membrane and oxidizing water to generate a proton

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 4

a cathode catalyst to hydrogenate the substance to be hydrogenated

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 5

hydrogenates a substance to be hydrogenated with a proton to generate an organic hydride

Methodology Applied

Scientific EffectHydrogenation: Hydrogenation

Data Source

PatentUS20240011170A1Cathode catalyst layer, organic hydride producing device, and method for preparing cathode catalyst ink

Publication Date: 2024.01.11 ENEOS CORP

AI summary

A cathode catalyst layer includes a cathode catalyst to hydrogenate a substance to be hydrogenated and a water repellent including an aggregate of arbitrary primary particles, the water repellent having a higher affinity for the substance to be hydrogenated and an organic hydride than for water. A volume fraction of the water repellent in the cathode catalyst layer is higher than 10 vol % with respect to the volume of the total solid content of the cathode catalyst layer.