Electroplated Cell Component Coating for Low-Resistance Stability
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Solution Overview
Problem
Current electrochemical cell components, such as flow field plates and fluid diffusion layers, face challenges in achieving high electrochemical stability, low interface resistance, and cost-effectiveness across a wide pH range and potential window, particularly in PEM electrolyzers and fuel cells, due to materials like titanium and stainless steel experiencing hydrogen embrittlement and high material costs of precious metals.
Innovation Solution
A component comprising a metal substrate with a layer system electroplated onto it, featuring a first layer of copper or nickel and a second layer of an alloy with tin, copper, nickel, silver, zinc, bismuth, or other elements, embedded with non-metallic conductive particles like carbon, graphite, or graphene, which enhances electrochemical stability and reduces interface resistance through improved adhesion and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If titanium plates are used in PEM electrolyzers, then the pH range can be extended from 1 to 7, but hydrogen embrittlement occurs on the cathode side and surface passivation increases ohmic losses
Solution Approach 1:
The patent applies composite materials by coating titanium plates with a multi-layer system consisting of a nickel-phosphorus intermediate layer and a tin-nickel-copper final layer. This composite structure combines the wide pH range adaptability of titanium with the hydrogen embrittlement resistance and electrochemical stability of the metallic coatings, resolving the contradiction between versatility and reliability
Solution Approach 2:
The patent replaces expensive precious metal coatings (platinum, gold, niobium) with a cost-effective tin-nickel-copper alloy coating system. This alternative coating provides similar protective functions against corrosion and hydrogen embrittlement while significantly reducing material costs, addressing the reliability issue without sacrificing performance
2Reliability
If precious metal coatings (Ir, Ru, Au) are used on titanium plates, then electrochemical stability is improved, but material costs exceed the target of $3/kW
Solution Approach 1:
The patent substitutes expensive precious metals (iridium, ruthenium, gold) with a tin-nickel-copper alloy coating system that provides comparable electrochemical stability and corrosion resistance. The coating layers are applied in the nm range, achieving the target cost of $3/kW while maintaining the necessary reliability for PEM electrolyzer operation
Solution Approach 2:
The patent uses a composite coating structure with a nickel-phosphorus intermediate layer and a tin-nickel-copper final layer. This composite material approach achieves electrochemical stability comparable to precious metals while using abundant, cost-effective materials, resolving the contradiction between reliability and ease of manufacture
3Ease of manufacture
If stainless steel plates are used on the anode side, then cost is reduced, but the application is limited to pH ranges around 7 due to high oxidation potentials
Solution Approach 1:
The patent creates a composite structure by coating stainless steel with a nickel-phosphorus intermediate layer and a tin-nickel-copper final layer. This composite material system extends the pH range and potential window compatibility of stainless steel, allowing it to be used in highly oxidizing environments (pH 1-7) while maintaining the cost advantage of stainless steel substrates
Solution Approach 2:
The patent changes the surface properties of stainless steel through electroplating with the tin-nickel-copper alloy coating. This parameter change in surface composition and structure enables the stainless steel to withstand high oxidation potentials and expand its applicable pH range from around 7 to 1-7, resolving the contradiction between cost 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 proposed solution provides excellent electrochemical stability and low interface resistance, reducing nickel diffusion into the membrane and preventing performance drops, while being cost-effective and suitable for redox flow cells, fuel cells, and electrolyzers, with the alloy forming a stable oxide layer for corrosion inhibition.
Implementation Method 1
A component for an electrochemical cell comprises a metal substrate and a layer system that is at least partially electroplated onto the metal substrate
Implementation Method 2
the alloy forming a stable oxide layer for corrosion inhibition
Implementation Method 3
embedded with non-metallic conductive particles like carbon, graphite, or graphene, which enhances electrochemical stability and reduces interface resistance
Data Source
AI summary
A component of an electrochemical cell, the component including a metal substrate and a layer system that is at least partially electroplated onto the metal substrate; the layer system optionally includes a first layer disposed on the metal substrate, and includes at least one second layer that is disposed on the metal substrate or, if applicable, on the first layer, the optional first layer being made of copper or nickel, and the at least one second layer being made of an alloy including at least two of the elements tin, copper, nickel, silver, zinc, bismuth, antimony, cobalt, manganese, tungsten, nonmetal particles having electrically conductive particles being incorporated into the alloy. The component forms in particular an electrode for a redox flow cell or a flow field plate for a fuel cell or an electrolyser.