Platinum Alloy Hydrogen Generation Electrode
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Solution Overview
Problem
Conventional electrodes for hydrogen generation in water or alkali metal chloride electrolysis suffer from high hydrogen overvoltage, susceptibility to poisoning by iron ions, and durability issues during stop-and-start operations, leading to increased energy consumption and economic challenges.
Innovation Solution
A platinum alloy with a transition metal element, such as nickel, cobalt, copper, silver, or iron, is supported on a conductive base material, formed by coating a metal compound solution and a platinum ammine complex, followed by thermal decomposition and reduction, to create a stable catalyst with low hydrogen overvoltage and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick supported material is used to decrease hydrogen overvoltage, then the activity increases, but the electrode distorts and the supported material peels due to plating stress
Solution Approach 1:
The invention changes the physical and chemical parameters of the supported material by alloying base metals (Ni, Co, Cu, Zn, Al, Fe) with platinum group metals (Pt, Pd, Ru, Rh, Ir) in specific ratios. This creates a composite material with optimized catalytic activity and mechanical strength, allowing thin layers to achieve low hydrogen overvoltage without distortion or peeling.
Solution Approach 2:
The invention uses composite materials consisting of base metals combined with platinum group metals in specific ratios. This composite structure provides both the catalytic activity needed for low hydrogen overvoltage and the mechanical strength to prevent electrode distortion and material peeling, resolving the contradiction between activity and stability.
2Reliability
If base metals are alloyed to improve activity, then the hydrogen overvoltage decreases, but the activity is insufficient and durability is poor
Solution Approach 1:
The invention creates composite materials by combining base metals (Ni, Co, Cu, Zn, Al, Fe) with platinum group metals (Pt, Pd, Ru, Rh, Ir) in specific ratios. This composite structure provides both the catalytic activity needed for low hydrogen overvoltage and the durability required for long-term operation, resolving the insufficiency of base metal alloying alone.
Solution Approach 2:
The invention optimizes the composition parameters by specifying exact metal ratios (e.g., Pt 1-50 wt%, Ni 50-98 wt%) and particle size (0.1-10 μm). These parameter changes enhance both the catalytic activity for low overvoltage and the structural stability for improved durability during extended electrolysis operations.
3Reliability
If conventional electrodes are used in electrolysis with iron ions present, then the hydrogen overvoltage increases due to poisoning, but energy consumption increases
Solution Approach 1:
The invention converts the harmful effect of iron ions into a beneficial outcome by using platinum group metal-containing supported materials that are resistant to iron ion poisoning. These materials maintain low hydrogen overvoltage even in the presence of iron ions, preventing energy consumption increases and turning the previously harmful electrolysis condition into a manageable scenario.
4Adaptability or versatility
If stop-and-start control is performed during electrolysis, then operational flexibility improves, but the hydrogen overvoltage rises and catalyst peels
Solution Approach 1:
The invention uses composite materials with strong adhesion between the supported material and base metal, combined with optimal porosity (30-70%), which maintain catalyst stability during stop-and-start operations. This prevents catalyst peeling and maintains low hydrogen overvoltage, enabling operational flexibility without reliability loss.
Solution Approach 2:
The invention optimizes physical parameters including porosity (30-70%) and particle size (0.1-10 μm) of the supported material. These parameter changes enhance the mechanical strength and adhesion of the catalyst layer, preventing peeling during stop-and-start cycles while maintaining low hydrogen overvoltage and enabling flexible operational control.
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 electrode achieves a low hydrogen overvoltage and maintains stability even with iron ions present, reducing energy consumption and preventing catalyst peeling during electrolysis and stop-and-start cycles, thus enhancing industrial applicability.
Implementation Method 1
a platinum alloy including an additional metal and platinum is supported on a conductive base material... the activity of these base metals are low. Therefore, the improvement of the activity by alloying the base metals alone was insufficient as an effect that decreases the hydrogen overvoltage.
Implementation Method 2
formed by coating a metal compound solution and a platinum ammine complex, followed by thermal decomposition and reduction
Implementation Method 3
followed by thermal decomposition and reduction, to create a stable catalyst with low hydrogen overvoltage
Data Source
AI summary
The present invention provides an electrode for hydrogen generation of which the hydrogen overvoltage is sufficiently low and which is not affected by poisoning due to iron ions, and furthermore, of which the durability is superior because during operations and stop-and-start control, the hydrogen overvoltage does not rise and exfoliation of the supported material does not occur. The present invention also provides a method for manufacturing the aforementioned hydrogen generation electrode and an electrolysis method using the electrode for hydrogen generation as a cathode. An electrode for hydrogen generation is used in which a platinum alloy including platinum and one metal selected from the group consisting of nickel, cobalt, copper, silver, and iron, or an amorphous material of a transition metal element and platinum is supported on a conductive base material. This electrode is obtained by coating a metal compound solution including one selected from the group consisting of nickel, cobalt, copper, silver, and iron, and a platinum compound solution which forms an ammine complex; drying; thermally decomposing at a temperature in a range from more than 200° C. to 700° C. or less; and then subjecting to a reduction processing.