NiFeCuCoMoPt High-Entropy Foam for Stable Hydrogen Evolution
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Solution Overview
Problem
Existing hydrogen production methods using Pt-based catalysts face issues such as high cost, scarce reserves, and poor catalytic stability, while new alloy materials suffer from complex preparation processes and low effective catalyst loading.
Innovation Solution
A six-membered high-entropy foam comprising NiFeCuCoMoPt alloy with a hierarchical porous structure and 3D-connected micron-scale pores is developed, utilizing a simple preparation method involving electrodeposition and freeze-drying, achieving high catalyst loading and low hydrogen evolution overpotential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Pt-based catalysts are used for hydrogen evolution reaction, then catalytic activity is improved, but cost increases and catalytic stability deteriorates
Solution Approach 1:
The patent applies composite materials by creating a high-entropy alloy foam comprising six different metals (Ni, Fe, Cu, Co, Mo, Pt) in equal atomic proportions. This composite structure combines the catalytic activity of Pt with the stability and cost-effectiveness of other metals, achieving both high hydrogen evolution reaction activity and improved catalytic stability while reducing overall Pt content.
Solution Approach 2:
The patent utilizes parameter changes by controlling the atomic composition ratios of the six metals to be within 10-25 at% each, and by adjusting the pore size parameters (0.1-100 μm) and wall thickness (1-20 μm) of the foam structure. These parameter optimizations enable the catalyst to achieve high activity while maintaining stability and reducing Pt loading.
2Quantity of substance
If new alloy materials are developed to reduce precious metal usage, then cost is reduced, but preparation process complexity increases
Solution Approach 1:
The patent employs porous materials by creating a foam structure with controlled porosity (30-70% pore volume), pore size (0.1-100 μm), and pore distribution. This porous architecture provides high surface area for catalysis while enabling simple electrodeposition preparation methods, avoiding complex multi-step synthesis procedures.
Solution Approach 2:
The patent replaces complex mechanical alloying processes with electrochemical deposition methods. The high-entropy alloy foam is prepared through controlled electrodeposition from aqueous solutions containing metal salts, followed by freeze-drying to form the porous foam structure. This substitution of mechanical processes with electrochemical methods simplifies the preparation process significantly.
3Productivity
If conventional alloy materials are used, then catalytic activity is maintained, but effective catalyst loading is reduced
Solution Approach 1:
The patent applies dimensionality change by transitioning from conventional two-dimensional or bulk three-dimensional catalyst structures to a three-dimensional porous foam architecture. This dimensional transformation provides vastly increased surface area and pore volume for catalyst loading, enabling higher effective catalyst loading while maintaining high catalytic activity through optimized mass transport pathways.
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 NiFeCuCoMoPt high-entropy foam exhibits high catalytic activity and stability at industrial-level current density, with catalyst loading ranging from 0.8 mg/cm2 to 3.2 mg/cm2 and overpotential of 36 mV-60 mV, outperforming conventional high-entropy alloys.
Implementation Method 1
the NiFeCuCoMoPt high-entropy foam exhibits high catalytic activity and stability at industrial-level current density
Implementation Method 2
a simple preparation method involving electrodeposition and freeze-drying
Implementation Method 3
a simple preparation method involving electrodeposition and freeze-drying
Data Source
AI summary
Six-membered high-entropy foam for hydrogen production by water splitting and preparation method are provided. The foam consists of Ni, Fe, Cu, Co, Mo, and Pt, comprising 10 at %-25 at % of Ni, 10 at %-25 at % of Fe, 10 at %-25 at % of Cu, 10 at %-25 at % of Co, 10 at %-25 at % of Mo, and 10 at %-25 at % of Pt. Catalyst loading of the foam can reach a range of 0.8 mg/cm2-3.2 mg/cm2, which is much higher than the effective catalyst loading of most nano-catalysts. When used as catalyst for hydrogen production by water splitting, the hydrogen evolution overpotential of the surface of the six-membered high-entropy foam is within a range of 36 mV-60 mV, and the foam operates stably at industrial-level current density (500 mA/cm2). The preparation method does not require harsh environment such as high temperature or high vacuum, making the method simple and easy to implement, with low-cost raw materials.