Co3O4 Flake Catalyst for Water Splitting Oxygen Evolution
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Solution Overview
Problem
Current water splitting oxygen evolving catalysts face challenges such as instability, low catalytic activity, and poor utility due to decomposition under light for organic-based catalysts, insufficient catalytic activity of heterogeneous bulk oxides, and poor connectivity of homogeneous polyoxometalate-based catalysts, which limits efficient oxygen generation in water splitting reactions.
Innovation Solution
A water splitting oxygen evolving catalyst comprising a metal oxide in a flake shape, represented by Co1-xMxOY, where M is Al, In, Ga, or Sn, with a specific surface area of 50-1000 m2/g, and a method of preparing it by forming a metal hydroxide on a working electrode and heat-treating it to convert it into a metal oxide, enhancing stability and activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic-based catalysts are used for water splitting, then catalytic activity can be achieved, but stability deteriorates due to decomposition by light
Solution Approach 1:
The patent uses composite materials by combining Co3O4 metal oxide with carbon materials (such as graphene, carbon nanotubes, or carbon nanofibers) to create a hybrid catalyst system. The Co3O4 provides catalytic activity for oxygen evolution while the carbon matrix provides structural stability and resistance to light-induced decomposition, thus resolving the contradiction between catalytic activity and stability.
2Reliability
If heterogeneous bulk oxide-based catalysts are used, then stability is improved, but catalytic activity deteriorates due to insufficient activity
Solution Approach 1:
The patent employs porous Co3O4 metal oxide structures with high surface area to volume ratio. The porous structure provides numerous active sites for catalysis while maintaining the stability of the metal oxide framework, thus improving catalytic activity without sacrificing stability.
Solution Approach 2:
The patent divides the bulk oxide into fine particles, nanoparticles, or porous structures, increasing the surface area and exposing more active sites. This segmentation transforms the low-activity bulk oxide into a high-activity catalyst while retaining the inherent stability of the metal oxide material.
3Productivity
If homogeneous polyoxometalate-based catalysts are used, then catalytic activity is improved, but utility per unit weight deteriorates due to disconnection from electrode
Solution Approach 1:
The patent merges the homogeneous polyoxometalate catalyst with the electrode surface through coating or anchoring techniques, creating an integrated system where the catalyst remains in contact with the electrode. This ensures both high catalytic activity and effective utilization by preventing catalyst detachment during operation.
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 catalyst achieves high activity and operational stability, maintaining catalytic performance even in acidic conditions, with improved durability and electronic conductivity, and sustained performance over extended periods.
Implementation Method 1
applying a voltage between the working electrode and the counter electrode so that the working electrode has a negative potential and a metal hydroxide is formed from the metal nitrate on the working electrode
Implementation Method 2
heat treating the metal hydroxide on the working electrode to convert the metal hydroxide to a metal oxide
Data Source
AI summary
A water splitting oxygen evolving catalyst including: a metal oxide particle including a metal oxide represented by Formula 1:Co1-xMxOY Formula Iwherein M is at least one selected from Al, In, Ga, Si, and Sn, x and y respectively satisfy the inequalities 0≦x<0.5 and 1<y<2, and the metal oxide particle is in the form of a flake.