Ru-Doped Iridium Oxide OER Catalyst for Stable Neutral Electrolysis

Solution Overview

Problem

The stability of anodic oxygen evolution reaction (OER) catalysts in electrocatalytic CO2 reduction processes is limited by high operating costs and low catalyst stability, particularly in neutral electrolytes, leading to poor performance under industrially relevant current densities.

Innovation Solution

Introduce ruthenium (Ru) doped iridium oxide (IrOx) catalysts (Ru/IrOx) to modify the electronic structure and enhance OER activity and stability, utilizing density functional theory (DFT) calculations to optimize Ru content, achieving a stable OER performance in neutral KHCO3 electrolyte.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional IrOx catalysts are used for OER in electrocatalytic CO2 reduction, then the catalyst shows initial activity, but the catalyst stability deteriorates rapidly under industrially relevant current densities

Engineering Contradiction:

Improvecatalyst stabilityVSAvoidOER activity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies composite materials by combining ruthenium (Ru) and iridium oxide (IrOx) to create a Ru-doped IrOx catalyst. This composite structure leverages the synergistic effects of both metals: Ir provides structural stability and catalytic activity, while Ru enhances stability and modifies electronic structure to improve OER performance under high current densities.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs parameter changes by optimizing the ruthenium doping concentration in iridium oxide. By adjusting the Ru content (e.g., 0.01-1 wt%), the catalyst's electronic structure is modified to enhance both activity and stability. The doping level is tuned to achieve optimal performance without excessive cost.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If ruthenium doped iridium oxide catalysts are used to enhance OER stability, then catalyst stability improves significantly, but operating costs increase due to precious metal content

Engineering Contradiction:

Improvecatalyst stabilityVSAvoidoperating cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies parameter changes by optimizing the ruthenium doping concentration in iridium oxide. By adjusting the Ru content (e.g., 0.01-1 wt%), the catalyst's electronic structure is modified to enhance both activity and stability. The doping level is tuned to achieve optimal performance without excessive cost.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies composite materials by combining ruthenium (Ru) and iridium oxide (IrOx) to create a Ru-doped IrOx catalyst. This composite structure leverages the synergistic effects of both metals: Ir provides structural stability and catalytic activity, while Ru enhances stability and modifies electronic structure to improve OER performance under high current densities.

Inventive Principle:

Principle #40Composite materials

3Productivity

If high current densities are applied to achieve industrially relevant CO2 reduction rates, then productivity improves, but catalyst stability deteriorates due to rapid degradation

Engineering Contradiction:

ImproveCO2 reduction rateVSAvoidcatalyst stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies composite materials by combining ruthenium (Ru) and iridium oxide (IrOx) to create a Ru-doped IrOx catalyst. This composite structure leverages the synergistic effects of both metals: Ir provides structural stability and catalytic activity, while Ru enhances stability and modifies electronic structure to improve OER performance under high current densities.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs parameter changes by optimizing the ruthenium doping concentration in iridium oxide. By adjusting the Ru content (e.g., 0.01-1 wt%), the catalyst's electronic structure is modified to enhance both activity and stability. The doping level is tuned to achieve optimal performance without excessive cost.

Inventive Principle:

Principle #35Parameter changes

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 Ru/IrOx catalyst exhibits enhanced OER activity and stability, maintaining performance for over 480 hours at 200 mA cm−2 current density, with a full cell voltage of 3.9 V, addressing the stability challenges of traditional IrOx and RuO2 catalysts.

Implementation Method 1

an anode including a second electrocatalyst comprising ruthenium doped iridium oxide, the second electrocatalyst configured to catalyze an oxygen evolution reaction to produce diatomic oxygen from the water

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

an electricity source configured to apply an electrical current across the cathode and the anode to catalyze the reduction and oxygen evolution reactions

Methodology Applied

Scientific EffectElectrolysis: Electrolysis

Data Source

PatentUS20260022472A1Electrocatalyst for oxygen evolution reactions

Publication Date: 2026.01.22 WU YIMIN A

AI summary

An example electrochemical system includes: a cathode including a first electrocatalyst configured to catalyze a reduction reaction of carbon dioxide to produce water; an anode including a second electrocatalyst comprising ruthenium doped iridium oxide, the second electrocatalyst configured to catalyze an oxygen evolution reaction to produce diatomic oxygen from the water; an electrolyte connecting the cathode and the anode; and an electricity source configured to apply an electrical current across the cathode and the anode to catalyze the reduction and oxygen evolution reactions.