Redox-Tolerant SOFC Anode Composition Against Nickel Delamination

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Solution Overview

Problem

State-of-the-art anodes in solid oxide fuel cells (SOFCs) are susceptible to damage and delamination due to nickel oxidation and volume changes during redox cycles, leading to reduced conductivity and performance, especially under fuel starvation conditions.

Innovation Solution

The anode is composed of a cermet with a functionally graded configuration, featuring a first layer with lower porosity and metal content and a second layer with higher porosity and nickel content, incorporating dopants like Al, Ba, Ca, Cr, Fe, Mo, Re, Rh, Ru, or Sr to stabilize nickel and prevent oxidation, thereby maintaining structural integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional nickel-based anode is used in SOFC, then good electro-catalytic activity and ionic conduction are achieved, but the anode is susceptible to oxidation and delamination during redox cycles

Engineering Contradiction:

Improveanode stability during redox cyclesVSAvoidnickel oxidation and volume changes

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The anode is pre-doped with metal dopants (Al, Ba, Ca, Cr, Fe, Mo, Re, Rh, Ru, Sr, or W) before operation to establish oxidation resistance from the outset. This preliminary modification of the metallic phase prevents nickel oxidation during subsequent redox cycles, eliminating the need for reactive measures during actual operation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The anode employs a composite cermet structure consisting of a ceramic phase (e.g., YSZ, GDC, SDC) and a dopped metallic phase (Ni with metal dopants). This composite material combines the oxidation resistance and ionic conduction of ceramics with the electro-catalytic activity of metals, while the dopants further enhance stability by preventing nickel oxidation.

Inventive Principle:

Principle #40Composite materials

2Use of energy by moving object

If the anode is designed with high nickel content for good conductivity, then electro-catalytic activity is improved, but susceptibility to oxidation and delamination increases

Engineering Contradiction:

Improveelectro-catalytic activityVSAvoidresistance to oxidation and delamination

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The metallic phase composition is modified by introducing metal dopants that change the chemical and physical parameters of the nickel-based alloy. This composition adjustment maintains or enhances electro-catalytic activity while simultaneously improving oxidation resistance, allowing the anode to withstand redox cycles without delamination.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If pre-reformers are added to the SOFC system to protect the anode, then anode durability is improved, but system complexity and cost increase

Engineering Contradiction:

Improveanode durabilityVSAvoidsystem structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention extracts and eliminates the need for separate pre-reformer components by integrating the necessary functionality directly into the anode material itself. The dopped metallic phase provides both electro-catalytic activity and oxidation resistance, allowing the anode to handle fuel reforming and redox cycles without external protection systems.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The dopped metallic phase in the anode performs multiple functions simultaneously: it provides electro-catalytic activity for fuel oxidation, maintains ionic and electronic conduction, and resists oxidation during redox cycles. This multi-functionality replaces what would otherwise require separate components like pre-reformers, simplifying the overall system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 anode composition and structure mitigate nickel oxidation and delamination, ensuring reliable operation under fuel starvation and reducing the need for pre-reformers, thus enhancing SOFC performance and durability.

Implementation Method 1

Methodology Applied

Scientific EffectRedox reactions: Redox Reactions

Implementation Method 2

The anode provides an electro-catalytically active surface for oxidation of the pre-reformed fuel

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 3

The fuel cell, operating at a typical temperature between 750° C. and 950° C., enables the transport of negatively charged oxygen ions from the cathode flow stream to the anode flow stream

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Data Source

PatentUS20250210679A1SOFC including redox-tolerant anode electrode and method of making the same

Publication Date: 2025.06.26 BLOOM ENERGY CORP

AI summary

A solid oxide fuel cell (SOPC) includes a solid oxide electrolyte, an anode disposed on a first side of the electrolyte and a cathode disposed on an opposing second side of the electrolyte. The anode includes a ceramic phase and a metallic phase including a Ni catalyst and a dopant including Al, Ba, Ca, Cr, Fe, Mo, Re, Rh, Ru, Sr, W, or any combination thereof.