Heterojunction Anode for Water Purification
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Solution Overview
Problem
Existing electrolysis anodes have low service life and inefficient Reactive Chlorine Species (RCS) generation, which limits their effectiveness in wastewater treatment and the chlor-alkali industry.
Innovation Solution
The development of an electrolysis anode with a first conductive metal oxide layer, a second semiconductor layer, and islands of a third semiconductor, specifically using iridium, titanium oxide, and tin oxide, fabricated using spray pyrolysis, to enhance RCS generation and anode durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semiconductor layer is used in the anode to enable water purification through electrochemical oxidation, then the ability to generate Reactive Chlorine Species (RCS) is improved, but the service life of the anode decreases due to dissolution of semiconductor components
Solution Approach 1:
The anode employs a composite structure consisting of a conductive metal oxide layer (e.g., IrO2, RuO2) combined with a semiconductor layer (e.g., TiO2, SnO2, ZnO). This composite material approach allows the system to benefit from both the electrical conductivity and stability of metal oxides and the RCS generation capability of semiconductors, resolving the contradiction between durability and purification effectiveness
Solution Approach 2:
The invention modifies the chemical and physical parameters of the anode materials by selecting specific metal oxides with appropriate band gaps, conductivity levels, and chemical stabilities. By adjusting composition ratios, layer thicknesses, and crystal structures, the system optimizes both the service life and RCS generation efficiency simultaneously
2Productivity
If known anodes are used for water purification, then the system structure is simple and easy to manufacture, but the current efficiency of RCS generation is too low to be desirable
Solution Approach 1:
The anode is segmented into multiple functional layers: a conductive metal oxide layer for electrical conductivity and stability, and a semiconductor layer for RCS generation. This segmentation allows each layer to perform its specific function optimally while maintaining overall system efficiency and manageability
Solution Approach 2:
The multi-layer anode structure serves multiple functions simultaneously: electron conduction, chemical stability, light absorption, and catalytic RCS generation. This multi-functionality approach increases current efficiency without proportionally increasing device complexity
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 anode design significantly improves RCS generation efficiency and service life, making it suitable for effective wastewater treatment and chlor-alkali processes with reduced energy consumption and increased pollutant removal capabilities.
Implementation Method 1
apply a voltage potential between an anode and a cathode that are in each contact with the wastewater to achieve electrochemical oxidation of organic matter
Implementation Method 2
A method of operating a water treatment system for electrolysis of water includes contacting the anode with water that includes chloride, and applying to the anode an anodic potential that is sufficient to generate reactive chlorine at the anode
Implementation Method 3
The anode may be manufactured using spray pyrolysis to apply each semiconductor material
Data Source
AI summary
A heterojunction anode for electrolysis is disclosed. The anode has a first conductive metal oxide (FCMO) layer, a second semiconductor layer contacting the FCMO layer, and one or more islands of a third semiconductor contacting the second semiconductor layer. The FCMO layer may be formed on a metallic base, such as titanium. The FCMO layer may include iridium, the second semiconductor layer may include titanium oxide, and the third semiconductor may include tin oxide. The anode may be manufactured using spray pyrolysis to apply each semiconductor material. The anode may be configured such that when placed in an electrolyte at least a portion of the second semiconductor layer and the islands are in direct physical contact with the electrolyte. The second semiconductor interlayer and third semiconductor islands enhance the production of reactive chlorine in chlorinated water. A water treatment system and method using the anode are also disclosed.