Monolithic Catalyst System for Water Photolysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing hydrogen from water are often expensive and environmentally unfriendly, particularly due to the use of conventional electrolysis, and there is a need for an efficient and sustainable process that mimics natural photosynthesis to split water into hydrogen and oxygen using light as an energy source.
Innovation Solution
A monolithic catalyst system comprising two photoactive materials in electrical contact, which, when irradiated with light of a wavelength greater than or equal to 420 nm, facilitates the splitting of water into hydrogen and oxygen through a process mimicking the Z scheme of photosynthesis, without the need for external voltage or harmful electrolytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electrolysis is used to produce hydrogen from water, then hydrogen production is achieved, but the process becomes expensive and environmentally unfriendly
Solution Approach 1:
The patent replaces the mechanical/electrical electrolysis system with a photochemical system that uses light energy to drive water splitting. The photocatalyst absorbs photons and generates electron-hole pairs that drive the water splitting reaction, substituting the need for external electrical power and expensive electrolytes with a sustainable photochemical process.
Solution Approach 2:
The patent changes the fundamental parameter of energy input from electrical energy (electrolysis) to optical energy (light). By using photocatalysts that absorb visible or UV light, the system transforms the energy source and reaction mechanism, eliminating the need for expensive electrical infrastructure and harmful electrolytes while maintaining high hydrogen production efficiency.
2Productivity
If photoelectrochemical water splitting is implemented, then hydrogen and oxygen are produced, but electrical connection and electrolyte transport increase system complexity
Solution Approach 1:
The patent merges the water splitting reaction and gas evolution into a single integrated photocatalyst particle. Both hydrogen and oxygen are generated simultaneously on the surface of the same photocatalyst particle, eliminating the need for separate electrodes, electrical connections, and electrolyte transport systems. This unified approach maintains high efficiency while dramatically reducing structural complexity.
Solution Approach 2:
The patent extracts and eliminates the complex electrical connection and electrolyte transport components from the water splitting system. By using a solid-state photocatalyst that directly splits water and releases gases on its surface, the system removes the need for liquid electrolytes, external circuits, and associated infrastructure, simplifying the overall device architecture.
3Productivity
If hydrogen and oxygen are produced in close proximity, then water splitting efficiency is improved, but the risk of oxygen-hydrogen reaction increases
Solution Approach 1:
The patent segments the gas evolution sites on the photocatalyst surface by creating distinct regions where hydrogen and oxygen are preferentially formed. The photocatalyst structure includes separate active sites or surface regions that spatially separate the two gas evolution reactions, preventing direct contact between hydrogen and oxygen while maintaining high overall water splitting efficiency.
Solution Approach 2:
The patent applies local quality by creating different surface properties or catalytic activities at different regions of the photocatalyst particle. Specific surface areas are optimized for hydrogen evolution while other areas are optimized for oxygen evolution, ensuring that the two reactions occur in spatially distinct zones that prevent harmful gas mixing while maintaining high productivity.
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 system efficiently generates hydrogen and oxygen separately, reducing the risk of oxygen-hydrogen reaction and eliminating the need for expensive or environmentally harmful components, while being flexible with various catalyst combinations for tailored performance.
Implementation Method 1
a first photoactive material capable by itself or together with one or more of an auxiliary material and an auxiliary catalyst when irradiated with light having a wavelength≧420 nm of generating oxygen and protons from water
Implementation Method 2
a second photoactive material capable by itself or together one or more of an auxiliary material and an auxiliary catalyst when irradiated with light having a wavelength≧420 nm of reducing protons in water to hydrogen
Implementation Method 3
the first photoactive material and second photoactive material being in electrical contact, particularly in direct electrical contact, via one or more electron-conducting materials
Implementation Method 4
the water or aqueous fluid or solution in contact with the first location and the water or aqueous fluid or solution in contact with the second location being in contact with each other such that protons can migrate from the first location to the second location
Data Source
AI summary
A monolithic catalyst system for the cleavage of water into hydrogen and oxygen comprises a first photoactive material capable by itself or together with an auxiliary material and/or an auxiliary catalyst when irradiated with light having a wavelength≧420 nm of generating oxygen and protons from water, and a second photoactive material capable by itself or together with an auxiliary material and/or an auxiliary catalyst when irradiated with light having a wavelength≧420 nm of reducing protons in water to hydrogen. The first and second photoactive materials are in electrical contact via an electron-conducting material.