MgTi2O5-δ Bipolar Plate Coating for Fuel Cell Corrosion
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Solution Overview
Problem
Metals used in fuel cell applications, such as bipolar plates, face challenges in being both chemically inert to resist corrosion and electrically conductive in aggressive environments, particularly in proton-exchange-membrane fuel cells, where existing coatings degrade quickly and are not economically feasible.
Innovation Solution
A non-stoichiometric magnesium titanium oxide material with oxygen vacancies, represented by the formula MgTi2O5-δ, is used, which provides both anticorrosive and conductive properties, with an electronic conductivity of 2-10 S/m at room temperature and a static corrosion current density less than 1 μA cm−2 at pH 2 and 0-80°C, suitable for use as a bipolar plate material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing protective coatings are applied to bipolar plates, then corrosion resistance is improved, but manufacturing cost increases and economic feasibility deteriorates
Solution Approach 1:
The patent optimizes manufacturing parameters by controlling sintering temperature (1000-1500°C) and composition ratios to achieve desired material properties in a single processing step, eliminating the need for multiple coating applications and reducing overall manufacturing complexity and cost
Solution Approach 2:
The patent incorporates corrosion-resistant oxide material directly into the bipolar plate manufacturing process during sintering, performing the protective function preparation in advance rather than requiring separate coating steps, thereby simplifying manufacturing and reducing costs
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 MgTi2O5-δ material effectively reduces corrosion and maintains electrical conductivity, offering improved durability and cost-effectiveness compared to traditional coatings, while maintaining stability in acidic environments.
Implementation Method 1
an anticorrosive, conductive material having oxygen vacancies and a formula (I): MgTi2O5-δ
Implementation Method 2
Metals in some industrial applications are especially susceptible to corrosion due to aggressive operating environments
Data Source
AI summary
A fuel cell bipolar plate (BPP) includes a metal substrate having a bulk portion and a surface portion comprising an anticorrosive, conductive material having oxygen vacancies and a formula (I):MgTi2O5-δ (I),where δ is any number between 0 and 3 optionally including a fractional part denoting the oxygen vacancies, the material having an electronic conductivity of about 2-10 S/m at room temperature in an ambient environment.