Base-Metal Alloy Electrode Composition for Durable Water Electrolysis

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Solution Overview

Problem

Noble metals used in electrodes are expensive, and base metals, while inexpensive, have low chemical stability and durability, leading to issues such as oxidation and poor performance in reactions like OER, HER, and HOR, with catalysts often deteriorating quickly.

Innovation Solution

Development of an electrode using an alloy of three or more base metal elements forming a solid solution, with the elements nearly equal in atomic composition, and optionally chemically bonded to carbon fibers, eliminating the need for a graphene film to enhance durability and reduce production costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If base metal is used as catalyst in electrode, then cost is reduced, but durability and chemical stability deteriorate due to oxidation and deterioration

Engineering Contradiction:

ImprovecostVSAvoiddurability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The patent uses a composite structure consisting of a base metal alloy catalyst supported on a carbon fiber substrate. This composite design allows the inexpensive base metal to function as a catalyst while the carbon fiber provides structural stability and resistance to oxidation, thereby maintaining both cost-effectiveness and durability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The carbon fiber acts as an intermediary between the base metal catalyst and the harsh operating environment. It mediates the interaction by providing a stable support that protects the base metal from direct exposure to oxidizing conditions, preventing deterioration while maintaining catalytic activity.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If noble metal is used as catalyst in electrode, then durability is improved, but cost increases

Engineering Contradiction:

ImprovedurabilityVSAvoidcost

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent replaces expensive noble metals with inexpensive base metal alloys that can provide comparable durability when properly supported. The base metal alloy, when stabilized on the carbon fiber substrate, achieves sufficient durability to replace noble metals without the associated high cost.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent changes the material parameters by transitioning from pure base metal to a base metal alloy composition, and from unsupported to carbon fiber-supported structure. These parameter changes enhance the chemical stability and durability of the base metal, making it a viable cost-effective alternative to noble metals.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If graphene film is formed on base metal alloy, then durability is improved, but production cost increases

Engineering Contradiction:

ImprovedurabilityVSAvoidproduction cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent uses carbon fiber as a structural copy or analogue to the protective graphene film concept. Instead of forming a thin graphene coating, the invention employs a three-dimensional carbon fiber substrate that provides equivalent protective and supportive functions, achieving durability through a more manufacturable and cost-effective approach.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The carbon fiber substrate functions as a flexible, porous three-dimensional structure that provides mechanical support and protection to the base metal alloy catalyst. This approach achieves the protective function of thin films like graphene while being more compatible with existing manufacturing processes and reducing production costs.

Inventive Principle:

Principle #30Flexible shells and thin films

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 electrode provides improved durability and performance at a lower cost by using a stable, cost-effective alloy catalyst, maintaining catalytic activity in harsh conditions.

Implementation Method 1

an alloy including three or more base metal elements, in which the three or more base metal elements are nearly equal in atomic composition proportion, and form a solid solution as a catalyst for an oxygen evolution reaction or for a hydrogen evolution reaction

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

three or more base metal elements, in which the three or more base metal elements are nearly equal in atomic composition proportion, and form a solid solution

Methodology Applied

Scientific EffectSolid solution strengthening: Solid Solution Strengthening

Data Source

PatentUS12442093B2Electrode, method for producing same, water electrolyzer, and fuel cell

Publication Date: 2025.10.14 UNIV OF TSUKUBA

AI summary

An electrode 10 includes, as a catalyst, an alloy including three or more base metal elements, in which the three or more base metal elements are nearly equal in atomic composition proportion, and form a solid solution. Also, an electrode 12 includes: a carbon fiber; and a catalyst including a base metal, at least a part of elements of the catalyst being chemically bonded to the carbon fiber. Further, the water electrolyzer includes an anode, a cathode, and a solid polymer electrolyte membrane provided between the anode and the cathode. The anode is the electrode 10, and/or the cathode is the electrode 12.