Iron-Carbon ORR Catalyst Composition Without Noble Metals

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Solution Overview

Problem

The use of noble metals in electrocatalysts for oxygen reduction reaction (ORR) in fuel cells is costly, resource-intensive, and environmentally impactful, and the synthesis processes are energy-intensive and difficult to scale, limiting the deployment of fuel cells in automotive applications.

Innovation Solution

A catalytic composition for gas diffusion electrodes is developed using iron and carbon, obtained through tribo-oxidation from brake pad friction, which is combined with a liquid phase and deposited on a backing sheet to create a membrane-electrode assembly without noble metals, reducing energy consumption and environmental impact.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If noble metals are used in electrocatalysts for ORR, then catalytic performance is improved, but cost and resource consumption increase

Engineering Contradiction:

Improvecatalytic performanceVSAvoidcost and resource consumption

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The invention changes the chemical composition parameters of the catalyst from noble metals to base metals (Fe, Co, Ni, Cu, Mn, Zn) with specific oxidation states, achieving comparable catalytic performance while eliminating the dependency on scarce and expensive noble metals

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates composite catalyst materials by combining multiple base metals in specific ratios (Fe:Co:Ni:Cu:Mn:Zn = 10-60:5-30:5-30:5-30:5-30:5-30 weight %) with carbon support, achieving synergistic effects that replace noble metals while maintaining catalytic activity

Inventive Principle:

Principle #40Composite materials

2Reliability

If high-temperature pyrolysis treatments are used in catalyst synthesis, then catalytic activity is improved, but energy consumption increases

Engineering Contradiction:

Improvecatalytic activityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The invention changes the thermal processing parameters from high-temperature pyrolysis (typically >700°C) to low-temperature treatments (50-200°C), achieving catalyst formation through alternative mechanisms such as in-situ oxidation and controlled precipitation, thereby dramatically reducing energy consumption

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces the thermal energy-driven pyrolysis process with chemically-driven catalyst formation using aqueous solutions, salts, and controlled oxidation, substituting high-energy thermal processing with low-energy chemical reactions

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If complex synthesis procedures are used, then catalyst performance is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvecatalyst performanceVSAvoidsynthesis procedure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention merges multiple synthesis steps into a single one-pot procedure where metal salts are mixed with carbon support in aqueous solution, followed by simultaneous drying and in-situ catalyst formation, eliminating the need for separate pyrolysis, reduction, and impregnation steps

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention employs self-assembly and in-situ formation mechanisms where the catalyst structure develops automatically during the drying process through controlled oxidation and precipitation, eliminating the need for complex external processing and post-treatment steps

Inventive Principle:

Principle #25Self-service

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 catalytic composition provides efficient ORR performance in alkaline environments, suitable for anion exchange fuel cells, while being cost-effective and environmentally friendly, utilizing abundant metals and avoiding high-temperature pyrolysis and expensive reagents.

Implementation Method 1

obtained through tribo-oxidation from brake pad friction

Methodology Applied

Scientific EffectTribo-oxidation: Oxidation

Implementation Method 2

catalytic composition provides efficient ORR performance in alkaline environments

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 3

combined with a liquid phase and deposited on a backing sheet

Methodology Applied

Scientific EffectDeposition: Deposition (physical)

Data Source

PatentUS20250329753A1Catalytic composition for gas diffusion electrode, gas diffusion electrode, membrane-electrode assembly for combustible cell, and related uses and making methods

Publication Date: 2025.10.23 FRENI BREMBO SPA

AI summary

A catalytic composition in particle form for making a gas diffusion electrode for an oxygen reduction reaction (ORR) has at least iron (Fe) in at least two different degrees of oxidation, optionally the at least two different degrees of oxidation being Fe and Fe2O3, and carbon (C). A gas diffusion electrode having the catalytic composition and a membrane-electrode assembly having the gas diffusion electrode are provided.