LDH Water Electrolysis Electrode Roughness Layer for Current Density

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Solution Overview

Problem

Existing water electrolysis electrodes exhibit insufficient performance and durability, particularly in terms of current density per unit electrode area, limiting the efficiency of hydrogen production from surplus renewable energy.

Innovation Solution

A water electrolysis electrode design featuring a layered double hydroxide (LDH) layer with a roughness layer that accounts for at least 4.8% of its thickness, enhancing the electrode's surface area and bonding strength, thereby increasing current density and durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a conventional layered double hydroxide layer is used on the electroconductive substrate, then the electrode can perform water electrolysis, but the current density per unit electrode area is insufficient and durability is limited

Engineering Contradiction:

Improvecurrent density per unit electrode areaVSAvoiddurability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies local quality by creating a roughness layer with specific surface characteristics at the interface between the layered double hydroxide and the electroconductive substrate. This roughness layer has a controlled thickness proportion (4.8% or more) that locally enhances the surface area and bonding strength, thereby improving current density and durability without requiring the entire electrode structure to be modified.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes parameter changes by controlling the thickness proportion of the roughness layer to be 4.8% or more of the total layered double hydroxide layer thickness. This specific parameter threshold is achieved through controlled electrodeposition conditions, which transforms the conventional smooth interface into a rough interface with enhanced properties for both productivity and reliability.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If the layered double hydroxide layer is made thicker to increase surface area, then the gas evolution rate improves, but the bonding strength to the substrate decreases

Engineering Contradiction:

Improvegas evolution rateVSAvoidbonding strength

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The patent applies dimensionality change by introducing a roughness dimension to the layered double hydroxide layer interface. Instead of simply increasing the overall layer thickness, the invention creates vertical roughness features (protrusions and recesses) that increase the effective surface area in the vertical dimension, thereby enhancing gas evolution rate while maintaining adequate bonding strength through the controlled roughness layer thickness proportion.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 enhanced electrode design significantly improves the gas evolution rate and durability, making it suitable for high-performance water electrolysis devices.

Implementation Method 1

a layered double hydroxide layer with a roughness layer that accounts for at least 4.8% of its thickness, enhancing the electrode's surface area

Methodology Applied

Scientific EffectSurface area enhancement through roughness layer:

Implementation Method 2

enhancing the electrode's surface area and bonding strength

Methodology Applied

Scientific EffectBonding strength enhancement: Adhesive

Implementation Method 3

water electrolysis electrode

Methodology Applied

Scientific EffectElectrolysis: Electrolysis

Data Source

PatentUS20260103814A1Water electrolysis electrode, water electrolysis anode, water electrolysis cathode, water electrolysis cell, and water electrolysis device

Publication Date: 2026.04.16 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A water electrolysis electrode includes an electroconductive substrate and a layered double hydroxide layer. The layered double hydroxide layer is disposed on a surface of the electroconductive substrate. The layered double hydroxide layer includes a roughness layer. In the layered double hydroxide layer, the proportion of the thickness of the roughness layer to the thickness of the layered double hydroxide layer is 4.8% or more.