Amorphous Metallic Electrocatalyst with Mesopores for Water Splitting
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Solution Overview
Problem
Current electrocatalytic materials for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) face challenges due to substandard conductivity, leading to catalyst degradation and instability, particularly in alkaline hydrolysis processes, where noble metal-based catalysts are scarce and costly, and transition metal-based alternatives suffer from oxidation and corrosion issues.
Innovation Solution
Development of an electrocatalytic material with an amorphous bulk metal structure and mesopores, formed through melt spinning and nanoetching, featuring a core-shell configuration where the core has lower ohmic resistance and is protected by an oxidized shell, enhancing conductivity and stability, and utilizing alloys like NiFeP and NiFePB with controlled metal-to-non-metal ratios and porosity for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transition metal-based catalysts are used to replace noble metal catalysts, then cost is reduced, but conductivity deteriorates leading to catalyst degradation
Solution Approach 1:
The patent employs composite materials by combining transition metals (Ni, Fe, Co) with non-metallic elements (P, B, N, C) to create alloy-based electrocatalysts. This composite structure achieves both low cost and high conductivity, resolving the contradiction between using affordable transition metals and maintaining electrical conductivity. The non-metallic components enhance electron transport while the metallic framework provides catalytic activity.
Solution Approach 2:
The patent utilizes porous structures with controlled porosity (30-70%) to increase surface area and improve mass transport. The porous architecture provides more active sites for catalysis while maintaining good conductivity through the interconnected metallic framework, thus improving reliability without sacrificing electrical properties.
2Reliability
If surface oxidation is prevented to maintain catalyst stability, then conductivity deteriorates, but if conductivity is improved, oxidation increases causing degradation
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating non-metallic elements (P, B, N, C) at controlled ratios (1-10 atomic %) to modify the material properties. This compositional adjustment optimizes both oxidation resistance and conductivity simultaneously, resolving the trade-off between stability and electrical performance.
Solution Approach 2:
The patent applies local quality by creating heterogeneous structures where different regions have different compositions and properties. The core maintains metallic character for conductivity while surface regions have enhanced oxidation resistance through non-metallic element enrichment, allowing both conductivity and stability to coexist.
3Productivity
If noble metal catalysts are used, then catalytic activity is high, but cost and scarcity become limiting factors
Solution Approach 1:
The patent replaces expensive, scarce noble metals with abundant, inexpensive transition metals (Ni, Fe, Co) that are readily available. The developed alloys achieve comparable catalytic activity for HER and OER reactions, making the system economically viable and scalable without relying on limited noble metal resources.
4Area of stationary object
If porosity is increased to improve surface area, then mass transport is enhanced, but structural integrity deteriorates
Solution Approach 1:
The patent applies local quality by creating heterogeneous structures where different regions have different compositions and properties. The core maintains metallic character for conductivity while surface regions have enhanced oxidation resistance through non-metallic element enrichment, allowing both conductivity and stability to coexist.
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 electrocatalytic material exhibits enhanced electron transfer efficiency, reduced contact resistance, and increased stability, achieving high activity and durability in both HER and OER, with a current density of 10 mA/cm² at 1.65 V for over 600 hours in alkaline electrolysis, surpassing other catalysts in water splitting efficiency.
Implementation Method 1
The electrocatalytic material exhibits enhanced electron transfer efficiency, reduced contact resistance
Implementation Method 2
at least a surface portion of the electrocatalytic material is an oxidized layer
Implementation Method 3
the substandard conductivity of these materials negatively affects their catalytic performance. There have been active research efforts toward improving the conductivity property of these materials, which were found to inevitably induce surface oxidation/passivation
Implementation Method 4
Hydrogen production by electrochemical water splitting is one attractive solution
Implementation Method 5
oxygen evolution reaction (OER)
Data Source
AI summary
An electrocatalytic material includes a bulk material metal including at least one metal, wherein the bulk material metal is in an amorphous form and includes mesopores. A method for making an electrocatalytic material includes forming an amorphous bulk material metal, and forming mesopores in the amorphous bulk material metal. The bulk material metal may in some instances be selected from an alloy of at least one metal and at least one non-metal selected from phosphorus, boron, nitrogen, carbon, and any combination thereof. The at least one metal may in some instances be selected from iron, cobalt, nickel, copper, zinc, titanium, manganese, molybdenum, niobium, zirconium, and any combination thereof.