Phosphorus-Doped Semiconductor Catalyst for Water Splitting
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Solution Overview
Problem
Current water splitting technologies face inefficiencies due to high over-potential on the oxygen-producing electrode, which is costly and unstable, requiring scarce metal elements and lacking in cost-effective and durable catalysts for practical applications.
Innovation Solution
Development of a catalyst comprising semiconductor materials with elevated phosphorous content, specifically metal-(Group VIb) semiconductors coated with metal-(Group VIb)-phosphorous species, produced through electrochemical deposition from ionic liquid electrolytes, reducing over-potential and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional water splitting devices use traditional catalysts, then the oxygen production reaction can occur, but high over-potential is required and scarce costly materials are needed
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst by incorporating phosphorous into metal oxide structures, creating metal phosphates and phosphonates. This compositional parameter change reduces the over-potential required for oxygen evolution while maintaining catalyst stability, eliminating the need for scarce noble metals like platinum and iridium.
Solution Approach 2:
The patent employs composite catalyst materials consisting of metal oxides combined with phosphorous compounds (metal phosphates and phosphonates). These composite structures leverage the synergistic effects of different materials to achieve both low over-potential and high stability, replacing traditional noble metal catalysts with abundant, cost-effective composite materials.
2Reliability
If scarce and costly materials are used in catalysts, then catalytic activity can be achieved, but cost-effectiveness deteriorates
Solution Approach 1:
The patent replaces expensive, scarce noble metal catalysts with abundant, inexpensive metal phosphates and phosphonates derived from common metals. These earth-abundant materials maintain sufficient catalytic activity for practical water splitting applications while dramatically reducing manufacturing costs and eliminating supply chain constraints associated with noble metals.
Solution Approach 2:
The patent modifies the catalyst composition to use abundant metals combined with phosphorous, changing the material parameter from scarce noble metals to plentiful earth-abundant elements. This parameter change maintains catalytic functionality while achieving cost-effectiveness for large-scale hydrogen production.
3Productivity
If photo-catalysts are suspended directly in water for single-step reaction, then efficiency improves, but catalyst stability and control deteriorate
Solution Approach 1:
The patent utilizes porous electrode structures coated with metal phosphate and phosphonate catalysts. The porous architecture provides high surface area for catalytic reactions while anchoring the catalyst particles firmly to the electrode substrate. This prevents catalyst detachment and aggregation, maintaining both high reaction efficiency and long-term stability.
Solution Approach 2:
The patent creates composite electrode-catalyst systems where metal phosphate and phosphonate catalysts are integrated with conductive electrode materials. This composite structure enables efficient electron transfer while maintaining catalyst stability, achieving both high productivity and reliability in photo-electrochemical water splitting.
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 reduced over-potential and improved stability, making the water splitting process more efficient and cost-effective, using abundant materials and maintaining activity over prolonged periods.
Implementation Method 1
Photo-electrochemical water splitting involves breaking down water into hydrogen and oxygen by electrolysis
Implementation Method 2
novel method of electrochemical deposition from ionic liquid electrolytes. In a particularly preferred embodiment, the method is used for electrodeposition of catalysts
Implementation Method 3
Photo-electrochemical water splitting involves breaking down water into hydrogen and oxygen by electrolysis, but the electrical energy is supplied from a photo-electrochemical cell (PEC) process
Data Source
AI summary
The present invention relates to a catalyst comprising (i) a semiconductor preferably comprising one or more metal-(Group VIb) semiconductors, and (ii) a semiconductor material having elevated phosphorous content preferably comprising one or more metal-(Group VIb))-phosphorous species.