Counter Electrode Carbon Layer Adhesion for Dye-Sensitized Solar Cells
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Solution Overview
Problem
Conventional counter electrodes for dye-sensitized photovoltaic cells, particularly those using platinum, are expensive and lack durability, limiting energy-conversion efficiency and requiring costly manufacturing processes, while carbon-based alternatives suffer from delamination and cracking under heat cycles.
Innovation Solution
A counter electrode comprising a conductive substrate with a porous carbon material layer adhered via a polymer resin adhesive layer, which is heat-treated to enhance durability and electrical conductivity, reducing manufacturing costs and improving energy-conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If platinum is used for the counter electrode, then electrical conductivity and catalytic property are improved, but manufacturing cost increases and surface area for catalysis is limited
Solution Approach 1:
The patent replaces expensive platinum with carbon materials (graphite powder, carbon black, activated carbon) that are significantly cheaper while maintaining the necessary electrical conductivity and catalytic properties for the counter electrode function
Solution Approach 2:
The patent uses composite structures combining carbon materials with binders (polymer materials, metal oxides, or metal particles) to create a counter electrode that achieves both cost reduction and maintained performance through synergistic material combinations
2Ease of manufacture
If carbon material is used for the counter electrode, then manufacturing cost is reduced, but durability deteriorates under heat cycle load
Solution Approach 1:
The patent combines carbon materials with binders (polymer materials, metal oxides, or metal particles) to create a composite structure that maintains the low cost advantage of carbon while significantly improving durability and resistance to heat cycle loading through the binding and stabilizing effects of the additional materials
Solution Approach 2:
The patent employs heat treatment processes to modify the physical and chemical parameters of the carbon material and composite structure, enhancing adhesion, electrical conductivity, and overall durability while maintaining cost-effectiveness
3Ease of manufacture
If carbon powder and binder mixture slurry is used, then ease of manufacture is improved, but durability is insufficient for long period use
Solution Approach 1:
The patent applies heat treatment to transform the binder material and improve the bonding between carbon particles and substrate, changing the physical and chemical parameters to achieve sufficient durability for long-term operation while maintaining the manufacturing simplicity of the slurry approach
Solution Approach 2:
The patent optimizes the composite structure of carbon materials with specific binder types (polymer materials, metal oxides, or metal particles) to ensure adequate adhesion and structural integrity for long-term durability while preserving the ease of manufacture through slurry application
4Reliability
If large-sized sputtering facility or wet coating method is used, then platinum counter electrode can be prepared, but manufacturing cost increases significantly
Solution Approach 1:
The patent replaces expensive platinum-based solutions requiring costly equipment with inexpensive carbon materials that can be applied using simple, low-cost methods such as slurry coating, eliminating the need for large-sized sputtering facilities
Solution Approach 2:
The patent substitutes complex mechanical sputtering equipment with simpler chemical and physical processes involving slurry preparation and coating, dramatically reducing manufacturing equipment costs while achieving functional equivalence
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 solution provides a durable and cost-effective counter electrode with high energy-conversion efficiency, as the porous carbon material layer is securely adhered to the substrate, maintaining stability and performance over time.
Implementation Method 1
an adhesive layer, and a porous carbon material layer, wherein the adhesive layer is formed on the substrate, and the porous carbon material layer is formed on the adhesive layer
Implementation Method 2
Platinum has the advantage of having a high degree of electrical conductivity... carbon material can provide energy-conversion efficiency that is almost identical to that of platinum
Implementation Method 3
platinum... has a catalytic property (oxidation-reduction reaction)... the electrolyte functions to receive the electrons from the counter electrode by an oxidation-reduction reaction
Implementation Method 4
which is heat-treated to enhance durability and electrical conductivity
Data Source
AI summary
A counter electrode and a dye-sensitized photovoltaic cell having the counter electrode are provided. The counter electrode includes a conductive substrate, an adhesive layer formed on the conductive substrate, and a porous carbon material layer formed on the adhesive layer.