Nickel-Based Catalyst for Alkaline Fuel Cells
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Solution Overview
Problem
The high cost and limited availability of platinum-based catalysts for alkaline fuel cells hinder their widespread use, and existing non-noble metal catalysts, such as nickel, suffer from insufficient conductivity and catalytic activity, particularly in alkaline fuel cells.
Innovation Solution
A nickel-based catalyst is developed, comprising nickel and at least one transition metal, optionally an alkaline earth metal, supported on a finely divided conductive carrier, with a weight ratio of nickel to transition metals and alkaline earth metals of at least 3:1, and using activated carbon with a specific surface area of at least 50 m2/g, to enhance conductivity and catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If platinum-based catalysts are used for alkaline fuel cells, then high catalytic activity and conductivity are achieved, but cost and availability become problematic
Solution Approach 1:
The patent replaces expensive platinum-based catalysts with cheaper nickel-based catalysts that can be disposed of or replaced more easily, eliminating the cost and availability constraints of noble metals while maintaining adequate catalytic performance for fuel cell operation
Solution Approach 2:
The patent creates a composite catalyst system combining nickel with transition metals (Co, Fe, Mn, Zn, Cu, Ag, Au, Pd, Pt, Rh, Ru, Ir, Os) and alkaline earth metals (Ca, Sr, Ba, Ra) supported on conductive carriers, achieving both cost reduction and maintained catalytic activity through synergistic material combinations
2Quantity of substance
If nickel-based catalysts are used to replace platinum, then cost is reduced, but conductivity and catalytic activity become insufficient
Solution Approach 1:
The patent develops composite nickel-based catalysts incorporating transition metals and alkaline earth metals that enhance electrical conductivity while maintaining low cost, achieving a balance between economic viability and functional performance
Solution Approach 2:
The patent utilizes porous conductive carriers with high surface area to support the nickel-based catalyst, improving conductivity and active surface area for catalytic reactions, thereby compensating for nickel's inherently lower conductivity compared to platinum
3Quantity of substance
If nickel-based catalysts are used to replace platinum, then cost is reduced, but catalytic activity becomes insufficient
Solution Approach 1:
The patent formulates composite catalysts where nickel is combined with transition metals (particularly Co, Fe, Mn) and alkaline earth metals that enhance catalytic activity for hydrogen oxidation and oxygen reduction reactions, achieving performance comparable to platinum at lower cost
Solution Approach 2:
The patent optimizes the local composition and distribution of metal components within the catalyst structure, creating regions with enhanced catalytic properties that compensate for nickel's lower intrinsic activity compared to platinum
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 nickel-based catalyst achieves performance comparable to platinum-based catalysts, offering cost-effective and efficient electrochemical activity for hydrogen oxidation in alkaline fuel cells, with improved conductivity and stability.
Implementation Method 1
A fuel cell (FC) is one of the oldest electrochemical devices that generate electricity, heat and water by direct electrochemical reaction of a hydrogen-rich fuel with oxygen
Implementation Method 2
supported on (iv) a finely divided electrically conductive carrier
Data Source
AI summary
The invention relates to a catalyst which is suitable for use in an anode of a fuel cell. The catalyst comprises (i) nickel metal and (ii) at least one metal selected from transition metals and may optionally also comprise (iii) at least one metal selected from alkaline earth metals. Metals (i), (ii) and, if present, (iii) are supported on (iv) a finely divided electrically conductive carrier. The weight ratio (i):((ii)+(iii)) is at least 3:1.