Fuel Cell Electrode Metaphosphate Catalyst With Less Noble Metal
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Solution Overview
Problem
Existing catalyst systems for fuel cells and electrolyzers require high amounts of expensive noble metals, leading to increased costs and limited availability.
Innovation Solution
A catalyst system comprising a carrier metal oxide and an electrically conductive metal phosphate, specifically in the form of metaphosphates with the general chemical formula Mezn+2(PnO3n+1)z, which reduces the need for noble metals and enhances electrical conductivity, stability, and hydrolysis resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high amounts of noble metals are used in the catalyst system, then catalytic activity is improved, but costs increase significantly
Solution Approach 1:
The patent replaces expensive noble metals with base metals (Fe, Co, Ni, Cu, Mn, Zn, Ca, Sr, Ba, or their combinations) that are significantly cheaper and more abundant. The catalyst system uses these base metals in oxide, hydroxide, carbonate, or phosphate forms to achieve catalytic activity without relying on precious metals like Pt, Pd, or Rh, thereby dramatically reducing material costs while maintaining functional performance.
Solution Approach 2:
The patent changes the chemical composition parameters of the catalyst by using metal oxides with specific crystal structures (such as perovskite, spinel, or rock salt structures) and controlling the oxidation states of metal ions. By adjusting the ratio of metal elements and their oxidation states, the catalyst achieves high activity without noble metals, resolving the contradiction between cost and performance.
2Duration of action of stationary object
If noble metals are used to ensure stability, then long-term performance is improved, but manufacturing costs increase
Solution Approach 1:
The patent employs base metal compounds instead of noble metals to achieve long-term stability. The metal oxides, hydroxides, carbonates, or phosphates of base metals are designed to be chemically stable under fuel cell operating conditions, providing durability without the high cost associated with noble metal catalysts.
Solution Approach 2:
The patent creates composite catalyst systems by combining multiple base metals in specific ratios and configurations. These composite structures (such as mixed-metal oxides or core-shell architectures) enhance stability through synergistic effects while maintaining low cost, as the composite design allows each metal component to contribute to both activity and stability without requiring expensive noble metals.
3Quantity of substance
If base metals are used instead of noble metals, then costs are reduced, but electrical conductivity and stability may deteriorate
Solution Approach 1:
The patent addresses the conductivity issue by controlling the oxidation states of base metals and designing specific crystal structures that facilitate electron transport. By adjusting the metal composition ratios and oxidation states (e.g., using mixed-valence compounds), the catalyst achieves sufficient electrical conductivity despite using base metals instead of noble metals.
Solution Approach 2:
The patent creates composite structures where base metals are combined in ways that enhance electrical conductivity and stability. The composite design allows for optimized electron transport pathways and improved chemical stability, compensating for the inherently lower conductivity of base metals compared to noble metals while maintaining cost-effectiveness.
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 catalyst system achieves cost-effectiveness and extensive use by minimizing noble metal usage, maintaining high electrical conductivity, ensuring long-term stability, and reducing sensitivity to hydrolysis, with specific examples demonstrating improved performance in fuel cells and electrolyzers.
Implementation Method 1
the catalyst material is formed by an electrically conductive metal phosphate
Implementation Method 2
the electrode comprising a catalyst system comprising a carrier metal oxide and a catalyst material
Implementation Method 3
the phosphates can condense to form annular metaphosphates and/or long-chain polyphosphates
Implementation Method 4
a fuel cell or the electrolyser is provided, comprising at least one electrode and at least one polymer electrolyte membrane
Data Source
AI summary
A fuel cell or an electrolyser includes at least one electrode and at least one polymer electrolyte membrane. The electrode includes a catalyst system comprising a carrier metal oxide and a catalyst material. The catalyst material is formed by an electrically conductive metal phosphate in the form of a metaphosphate of the general chemical formula Mezn+2(PnO3n+1)z, where Me=metal, z=valency of the metal Me, and n is within the range of 1 to 10.