Amorphous Iridium Oxide Catalyst for Water Electrolysis
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Solution Overview
Problem
Current water electrolysis methods using iridium oxide catalysts exhibit insufficient activity, and there is a need for a catalyst that can efficiently perform water electrolysis with higher activity, particularly focusing on the relationship between operating conditions and the electronic and morphological structure of Ir.
Innovation Solution
A composite catalyst comprising an electrically conductive material and an amorphous oxide of a transition metal, where the oxidation number of the transition metal changes flexibly and reversibly with applied voltage, reducing overvoltage and enhancing catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional iridium oxide catalysts are used for water electrolysis, then the electrolysis process can be performed, but the catalytic activity is insufficient and high overvoltage is required
Solution Approach 1:
The patent applies parameter changes by utilizing voltage-induced oxidation state transitions of iridium. When voltage is applied during electrolysis, the iridium oxidation state dynamically adjusts between +3 and +5, optimizing the catalytic activity for oxygen evolution. This dynamic parameter adjustment resolves the contradiction by enabling high productivity while reducing the overvoltage requirement through electronic structure modulation.
Solution Approach 2:
The patent employs composite materials by combining iridium oxide with conductive supports such as carbon materials or metal oxides. This composite structure enhances the electrical conductivity and catalytic activity of the iridium oxide, allowing efficient electron transfer during electrolysis. The composite approach increases water electrolysis activity while maintaining manageable overvoltage levels.
2Productivity
If high voltage is applied to increase catalytic activity, then water electrolysis rate improves, but energy consumption increases
Solution Approach 1:
The patent implements feedback through the voltage-dependent oxidation state transition of iridium. The system automatically adjusts the electronic structure of the catalyst in response to the applied voltage, with the iridium oxidation state increasing at higher voltages to maintain optimal catalytic activity. This feedback mechanism allows the system to achieve high productivity without proportionally increasing energy consumption, as the catalyst self-regulates its electronic properties.
3Reliability
If iridium oxide is used as catalyst, then water electrolysis can proceed, but the oxidation state remains fixed and cannot adapt to operating conditions
Solution Approach 1:
The patent applies dynamics by transitioning from a static oxidation state in conventional iridium oxide to a dynamic, voltage-responsive oxidation state. The iridium oxidation state continuously adjusts between +3 and +5 based on the applied voltage during electrolysis. This dynamic adaptation enhances the catalyst's ability to maintain optimal performance across varying operating conditions, resolving the contradiction between stability and adaptability.
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 demonstrates high activity for water electrolysis, with the oxidation number of iridium changing to a high valence state, leading to a decrease in overvoltage and improved electrolysis performance.
Implementation Method 1
electrolysis of water is known. Similar to the steam reforming method using fossil fuels, electrolysis of water is an industrially established hydrogen production method
Implementation Method 2
the oxidation number of the transition metal changes flexibly and reversibly in response to an applied voltage
Implementation Method 3
using electrodes with high catalytic activity that have a strong ability to promote electrochemical reactions
Data Source
AI summary
This composite comprises: a material having electrical conductivity; and a transition metal oxide which is supported by said material. The transition metal oxide has an amorphous structure.