Nickel Phosphide Catalysts for Selective CO2 Reduction
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Solution Overview
Problem
Current technologies for the direct electrochemical reduction of carbon dioxide (CO2) to hydrocarbons face challenges such as competition from hydrogen production, high costs of noble metal electrocatalysts, and low product selectivity when using cheaper Cu electrocatalysts.
Innovation Solution
The use of nickel phosphide electrocatalysts, tailored with co-catalysts such as acids or bases, to enhance the efficiency and selectivity of CO2 reduction to oxygenated hydrocarbons, such as ethylene glycol, by influencing reaction intermediate binding orientations, activating species, and altering binding strengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If noble metal electrocatalysts are used for CO2 reduction, then catalytic activity is improved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive noble metal electrocatalysts with cheaper nickel phosphide-based catalysts. The nickel phosphide catalysts provide sufficient catalytic activity for CO2 reduction while being significantly more cost-effective, abandoning the reliance on scarce and expensive noble metals in favor of abundant, inexpensive transition metal phosphides.
Solution Approach 2:
The patent modifies the catalyst composition by incorporating phosphorus into nickel-based materials to form nickel phosphide compounds. This compositional parameter change transforms ordinary nickel into a highly active electrocatalyst for CO2 reduction, achieving noble-metal-level performance through chemical modification rather than using expensive noble metals directly.
2Ease of manufacture
If Cu electrocatalysts are used for CO2 reduction, then cost is reduced, but product selectivity deteriorates
Solution Approach 1:
The patent changes the chemical composition parameter by forming nickel phosphide compounds instead of using pure copper or nickel. This compositional modification fundamentally alters the catalyst's electronic structure and surface properties, enabling high selectivity for specific hydrocarbon products while maintaining cost-effectiveness.
Solution Approach 2:
The patent creates composite nickel phosphide materials that combine nickel with phosphorus to form a new compound class. This composite approach leverages the synergistic effects between nickel and phosphorus to achieve both cost-effectiveness and high product selectivity, overcoming the limitations of single-metal catalysts.
3Quantity of substance
If water is used as hydrogen source in DCRR, then H2 production increases, but competition from H2 evolution reaction worsens product selectivity
Solution Approach 1:
The patent modifies the catalyst's chemical composition by incorporating phosphorus into nickel-based materials. This compositional change alters the catalyst's binding affinity for different intermediates, enabling it to preferentially bind and reduce CO2-derived species over H+ from water, thereby suppressing the hydrogen evolution reaction and improving hydrocarbon product selectivity.
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
This approach results in improved product selectivity and efficiency, enabling the production of purer compounds with reduced processing requirements, and potentially replacing fossil resources as a source for chemical feedstocks and energy storage.
Implementation Method 1
electrochemical reduction of carbon dioxide and/or carbon monoxide to hydrocarbons, carbohydrates and other useful products
Implementation Method 2
nickel phosphide electrocatalyst for the direct electrochemical reduction of carbon dioxide
Implementation Method 3
This co-catalyst binds to a reaction intermediate on the surface: 1) influencing the intermediate's binding orientation
Data Source
AI summary
Disclosed are cathodes comprising a conductive support substrate having an electrocatalyst coating containing nickel phosphide nanoparticles. The conductive support substrate is capable of incorporating a material to be reduced, such as CO2 or CO. A co-catalyst, either incorporated into the electrolyte solution, or adsorbed to, deposited on, or incorporated into the bulk cathode material, provides increased selectivity and activity of the nickel phosphide electrocatalyst. Also disclosed are electrochemical methods for selectively generating hydrocarbon and/or carbohydrate products from CO2 or CO using water as a source of hydrogen.