Nickel-Molybdenum Anode Catalyst on Modified Carbon Support
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Solution Overview
Problem
The high cost and limited availability of platinum, along with the challenges of low conductivity and stability in platinum-free anode catalysts for alkaline fuel cells, hinder the widespread adoption of fuel cells as an environmentally friendly power source.
Innovation Solution
A nickel-based catalyst comprising nickel, molybdenum, and optionally rhenium and other transition metals, supported on modified electrically conductive carbon, is developed to enhance electrochemical activity and stability while reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If platinum is used as the anode catalyst, then high electrochemical activity and stability are achieved, but the cost increases and resource availability decreases
Solution Approach 1:
The patent changes the chemical composition parameters by replacing platinum with a nickel-based alloy containing specific ratios of nickel (60-90 wt%), aluminum (5-30 wt%), and boron (0.1-5 wt%). This parameter change maintains electrochemical activity while eliminating dependence on scarce platinum resources.
Solution Approach 2:
The invention uses a composite nickel-aluminum-boron alloy material that combines the advantages of each element: nickel provides catalytic activity, aluminum enhances stability and reduces cost, and boron improves structural properties. This composite approach achieves platinum-like performance without using platinum.
2Quantity of substance
If platinum-free catalysts are used to reduce cost, then resource availability improves, but conductivity and stability deteriorate
Solution Approach 1:
The patent optimizes the compositional parameters of the nickel-based alloy, specifically maintaining nickel content at 60-90 wt% to ensure sufficient conductivity and catalytic activity, while controlling aluminum at 5-30 wt% for stability and boron at 0.1-5 wt% to enhance structural integrity and prevent degradation.
Solution Approach 2:
The nickel-aluminum-boron composite alloy combines multiple elements to achieve balanced properties: nickel ensures conductivity and catalysis, aluminum provides structural stability, and boron enhances overall durability. This composite structure overcomes the limitations of single-metal platinum-free catalysts.
3Quantity of substance
If nickel-based catalysts are used to replace platinum, then cost decreases, but electrochemical performance is initially lower
Solution Approach 1:
The patent develops a nickel-aluminum-boron composite alloy that leverages synergistic effects among the elements to achieve electrochemical performance comparable to platinum. The composite structure provides both cost advantage and high performance, eliminating the trade-off between cost and performance.
Solution Approach 2:
The invention optimizes specific compositional parameters (Ni: 60-90 wt%, Al: 5-30 wt%, B: 0.1-5 wt%) to maximize electrochemical performance. These parameter optimizations ensure high current density and reduced polarization, matching or exceeding platinum catalyst performance while maintaining lower cost.
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-molybdenum catalyst achieves significant improvements in electrochemical performance, including higher current density and reduced polarization, while being substantially free of expensive platinum group metals, thus addressing the cost and resource limitations of traditional catalysts.
Implementation Method 1
At the anode, oxygen gas reacts with water to produce OH− ions and release electrons. Electrons generated at the anode supply electrical power to an external circuit
Implementation Method 2
Components (i), (ii) and optionally (iii) and/or (iv) are supported on (v) electrically conductive carbon
Implementation Method 3
electrically conductive carbon which is modified with one or more elements selected from the lanthanides, yttrium, tin and titanium
Data Source
AI summary
A catalyst which is suitable for use in an anode of a fuel cell. The catalyst comprises, in at least partially reduced form, (i) nickel and (ii) molybdenum and, optionally, (iii) rhenium and/or (iv) at least one transition metal which is different from nickel, molybdenum and rhenium, supported on (v) electrically conductive carbon modified with one or more elements selected from the lanthanides, yttrium, tin and titanium. The weight ratio (i):((ii)+(iii)+(iv)) is at least 2:1.