W18O49/CoO/NF Electrocatalyst for HER and OER
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Solution Overview
Problem
Current electrocatalytic materials for hydrogen and oxygen production, such as noble metal-based catalysts, are costly and limited in availability, while non-noble metal materials like W18O49 require improvements in electrocatalytic activity due to high theoretical overpotential and lack of studies on non-stoichiometric forms, especially when integrated with conductive substrates to avoid binder interference.
Innovation Solution
A self-supporting W18O49/CoO/NF electrocatalytic material is synthesized using a solvothermal method and solid-phase sintering on a foamed nickel substrate, with CoO nanosheets and W18O49 nanowires grown in situ, optimizing the molar ratio and loading capacity to enhance electron transfer and catalytic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noble metal Pt-based materials are used as HER electrocatalysts, then electrocatalytic activity is improved, but cost increases and availability decreases
Solution Approach 1:
The patent replaces expensive noble metal Pt-based materials with non-noble metal W18O49 and CoO materials that are abundant and cost-effective. The composite catalyst W18O49/CoO/NF achieves satisfactory electrocatalytic activity for both HER and OER without relying on rare noble metals, directly addressing the cost and availability issue while maintaining functional performance.
Solution Approach 2:
The patent creates a composite material system W18O49/CoO/NF that combines tungsten oxide and cobalt oxide on nickel foam substrate. This composite structure synergistically improves electrocatalytic activity for both hydrogen evolution and oxygen evolution reactions, replacing noble metal catalysts with a cost-effective composite that maintains or enhances performance.
2Quantity of substance
If W18O49 is used as electrocatalyst, then non-noble metal cost-effectiveness is improved, but electrocatalytic activity decreases due to high theoretical overpotential
Solution Approach 1:
The patent constructs a composite catalyst W18O49/CoO/NF where CoO nanosheets are grown on nickel foam and W18O49 nanowires are grown on the CoO nanosheets. This hierarchical composite structure synergistically combines the advantages of both materials, improving electrocatalytic activity for HER and OER while maintaining cost-effectiveness of non-noble metals.
Solution Approach 2:
The patent creates a hierarchical structure with CoO nanosheets as the base layer and W18O49 nanowires as the outer layer on nickel foam substrate. Each material is positioned optimally to发挥 its specific function, with the composite structure providing enhanced active sites and improved electron transfer pathways that overcome the high overpotential issue of pure W18O49.
3Ease of manufacture
If conventional catalyst preparation methods are used with binders, then ease of manufacture is improved, but conductivity and active area are reduced due to binder interference
Solution Approach 1:
The patent employs a solvothermal method where W18O49 nanowires self-grow directly on the CoO nanosheets that are already grown on the nickel foam substrate. This self-supporting growth mechanism eliminates the need for external binders to attach catalyst particles to the substrate, thereby maintaining high conductivity and maximizing active area without binder interference, while still providing a straightforward one-step preparation process.
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 W18O49/CoO/NF material exhibits improved electrocatalytic performance for hydrogen and oxygen production in alkaline electrolytes, with controlled morphology and loading, facilitating rapid electron transfer and stability, outperforming single-phase materials.
Implementation Method 1
A self-supporting W18O49/CoO/NF electrocatalytic material is synthesized using a solvothermal method and solid-phase sintering on a foamed nickel substrate
Implementation Method 2
A self-supporting W18O49/CoO/NF electrocatalytic material is synthesized using a solvothermal method and solid-phase sintering on a foamed nickel substrate
Implementation Method 3
The W18O49/CoO/NF material exhibits improved electrocatalytic performance for hydrogen and oxygen production in alkaline electrolytes
Implementation Method 4
facilitating rapid electron transfer and stability, outperforming single-phase materials
Implementation Method 5
Oxygen defects in metal oxides as active sites can improve conductivity and facilitate the adsorption and desorption of water molecules or intermediate reactive substances
Data Source
AI summary
The present disclosure relates to a W18O49/CoO/NF self-supporting electrocatalytic material and a preparation method thereof, the W18O49/CoO/NF self-supporting electrocatalytic material comprises: a foamed nickel substrate, and a W18O49/CoO composite nano material generated on the foamed nickel substrate in situ; preferably, wherein the W18O49/CoO composite nano material comprises CoO nanosheets attached directly to the foamed nickel substrate, and W18O49 nanowires attached to the nanosheets.