Fluorine-Doped Mn-Cu Oxide Electrocatalysts for Acidic Media
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Solution Overview
Problem
Current energy generation and storage technologies, such as proton exchange membrane fuel cells and water electrolysis, are hindered by the high cost and limited availability of noble metal-based electro-catalysts, which also suffer from degradation in acidic media, leading to reduced performance and short service life.
Innovation Solution
Development of non-noble metal-based electro-catalyst compositions, specifically using manganese and copper oxides with fluorine doping, that exclude noble metals entirely, enhancing electronic conductivity and stability for oxygen reduction and evolution reactions in acidic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noble metal-based electro-catalysts are used, then electrochemical performance and stability are improved, but cost and availability are worsened
Solution Approach 1:
The patent replaces expensive noble metal electro-catalysts with non-noble metal-based electro-catalysts that are cheaper and more abundant. The composition uses metals such as iron, cobalt, nickel, manganese, copper, zinc, and their oxides, hydroxides, or sulfides to create a cost-effective alternative that maintains acceptable electrochemical performance without relying on scarce precious metals
Solution Approach 2:
The patent employs composite material structures combining non-noble metals, their oxides, hydroxides, and sulfides in specific ratios. This composite approach allows the material to achieve enhanced electrochemical performance comparable to noble metals while maintaining low cost and high abundance, resolving the contradiction between performance and cost
2Productivity
If noble metal-based electro-catalysts are used, then reaction kinetics are improved, but degradation in acidic media is worsened
Solution Approach 1:
The patent modifies the chemical composition parameters by using non-noble metals and their compounds (oxides, hydroxides, sulfides) instead of noble metals. The specific formulation with metals like iron, cobalt, nickel, manganese, copper, and zinc in controlled ratios changes the material properties to achieve both good reaction kinetics and improved resistance to degradation in acidic media
Solution Approach 2:
The patent creates electro-catalyst compositions with specific local chemical environments by combining different non-noble metal compounds in defined ratios. This local compositional optimization allows certain regions of the catalyst to facilitate reaction kinetics while other regions provide stability and resistance to acidic degradation
3Quantity of substance
If non-noble metal-based electro-catalysts are used, then cost is reduced, but electrochemical activity is worsened
Solution Approach 1:
The patent uses composite materials comprising non-noble metals, oxides, hydroxides, and sulfides in specific combinations. This composite structure enables the catalyst to achieve electrochemical activity comparable to noble metals while maintaining low cost, as the synergistic interaction between different metal compounds compensates for the lower intrinsic activity of individual non-noble metals
Solution Approach 2:
The patent optimizes the compositional parameters by adjusting the ratios of non-noble metals and their compounds. By carefully controlling the formulation with metals such as iron, cobalt, nickel, manganese, copper, and zinc, the catalyst achieves enhanced electrochemical activity that rivals noble metals while maintaining cost-effectiveness
4Quantity of substance
If non-noble metal-based electro-catalysts are used, then availability is improved, but stability in acidic media is worsened
Solution Approach 1:
The patent changes the chemical composition parameters by using abundant non-noble metals and their stable compounds (oxides, hydroxides, sulfides). The specific formulation with metals like iron, cobalt, nickel, manganese, copper, and zinc in controlled ratios provides both high availability and improved stability in acidic media through the inherent chemical stability of these compounds
Solution Approach 2:
The patent employs composite material structures combining multiple non-noble metal compounds that work synergistically. This composite approach enhances stability in acidic media while maintaining high availability, as the combination of different metal compounds provides both abundance and chemical resilience
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 non-noble metal-based electro-catalysts demonstrate superior electrochemical activity, stability, and methanol tolerance, comparable to noble metal electro-catalysts, while reducing costs and extending the lifespan of energy conversion and storage systems.
Implementation Method 1
specifically using manganese and copper oxides with fluorine doping, that exclude noble metals entirely, enhancing electronic conductivity and stability
Implementation Method 2
non-noble metal-based electro-catalyst compositions... for oxygen reduction and evolution reactions in acidic conditions
Data Source
AI summary
The invention provides noble metal-free electro-catalyst compositions for use in acidic media, e.g., acidic electrolyte. The noble metal-free electro-catalyst compositions include non-noble metal absent of noble metal. The non-noble metal is non-noble metal oxide, and typically in the form of any configuration of a solid or hollow nano-material, e.g., nano-particles, a nanocrystalline thin film, nanorods, nanoshells, nanoflakes, nanotubes, nanoplates, nanospheres and nanowhiskers or combinations of myriad nanoscale architecture embodiments. Optionally, the noble metal-free electro-catalyst compositions include dopant, such as, but not limited to halogen. Acidic media includes oxygen reduction reaction (ORR) in proton exchange membrane (PEM) fuel cells, and direct methanol fuel cells and oxygen evolution reaction (OER) in PEM-based water electrolysis and metal air batteries, and hydrogen generation from solar energy and electricity-driven water splitting.