Hydrated Cobalt Tungstate Catalyst for Oxygen Evolution
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Solution Overview
Problem
The oxygen evolution reaction (OER) in water splitting is kinetically limiting, hindering the production of hydrogen, and existing catalysts like ruthenium and iridium oxides are impractical due to their rarity.
Innovation Solution
A process using hydrated cobalt tungstate nanoparticles as a catalyst, formed by combining Co(NO3)4 and Na2WO4 and exposing the solution to microwave energy for a hydrothermal reaction, which can be attached to an electrode for enhanced water oxidation and oxygen evolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ruthenium and iridium oxides are used as catalysts, then the oxygen evolution reaction kinetics are improved, but the cost and rarity of the catalyst becomes impractical for large-scale use
Solution Approach 1:
The patent replaces expensive, rare precious metal catalysts (ruthenium and iridium oxides) with a cheaper, earth-abundant alternative (cobalt tungstate). This substitution maintains catalytic functionality while eliminating the constraint of material rarity and high cost, making the system practical for large-scale hydrogen production.
Solution Approach 2:
The patent alters the chemical composition parameter of the catalyst from precious metal oxides to cobalt tungstate, changing the material system while maintaining the catalytic function. This parameter change enables the system to achieve similar kinetic performance without relying on rare elements.
2Ease of manufacture
If conventional heating methods are used for catalyst synthesis, then the manufacturing process is simple, but the energy efficiency and reaction speed are insufficient
Solution Approach 1:
The patent replaces conventional thermal heating methods with microwave irradiation for catalyst synthesis. This substitution of the heating mechanism (from conductive/convective thermal transfer to dielectric heating) dramatically improves energy efficiency and reaction speed, as microwaves directly couple with the polar solvent and reactants, enabling rapid and uniform heating.
Solution Approach 2:
The patent utilizes the phase transition of water from liquid to supercritical state under microwave irradiation. The rapid heating by microwaves brings the reaction medium to supercritical conditions, enhancing reactant solubility and reaction kinetics, thereby improving both energy efficiency and synthesis speed.
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 hydrated cobalt tungstate catalyst demonstrates increased stability and activity, improving the kinetics of the oxygen evolution reaction and enabling efficient hydrogen production from water, potentially scalable and sustainable.
Implementation Method 1
exposing the solution to a source of microwave energy and initiating a hydrothermal reaction forming hydrated CoWO4
Implementation Method 2
the hydrated cobalt tungstate catalyzing the oxidation of water and producing oxygen
Data Source
AI summary
A process of forming an oxygen evolution catalyst includes the steps of: providing Co(NO3)4; providing Na2WO4; combining the Co(NO3)4 and Na2WO4 forming a solution; exposing the solution to a source of microwave energy and initiating a hydrothermal reaction forming hydrated CoWO4. The oxygen evolution catalyst including hydrated CoWO4 may be used to split water into oxygen and hydrogen ions.