Pt-Based Electrocatalyst with Engineered Carbon Support
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Solution Overview
Problem
Proton-exchange membrane (PEM) fuel cells face challenges due to the high cost of platinum (Pt) catalysts, sluggish kinetics of the oxygen reduction reaction (ORR), and low stability of Pt-based catalysts, with previous efforts focusing on intrinsic activity and stability while neglecting the impact of the catalyst support on proton and gas transfer.
Innovation Solution
A manufacturing method involving reductive treatment of a catalyst support and reacting Pt-containing and N-containing precursors to form PtN or PtNM nanostructures affixed to the support, which are then annealed and exposed to acid, creating a high-performance Pt-based electrocatalyst with reduced Pt usage and improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Pt-based catalysts are used to achieve high activity in PEM fuel cells, then the catalytic performance is improved, but the cost increases and stability decreases
Solution Approach 1:
The patent uses composite materials by combining Pt-based catalysts with specifically engineered carbon support materials that have tailored surface properties. The carbon support is modified with heteroatoms (N, S, P, B) to create a composite structure that enhances both activity and stability, allowing the Pt catalyst to maintain high performance while being protected from degradation mechanisms
Solution Approach 2:
The patent applies parameter changes by modifying the surface oxygen content of the carbon support through controlled oxidation treatments. By adjusting the oxygen content and distribution on the carbon support surface, the patent optimizes the interaction between the support and Pt catalyst, thereby improving stability without sacrificing catalytic activity
2Quantity of substance
If Pt loading is reduced to lower cost, then the cost decreases, but the catalytic activity and performance deteriorate
Solution Approach 1:
The patent applies local quality by creating non-uniform distribution of Pt particles on the carbon support surface. By concentrating Pt in specific locations where the carbon support has optimal surface properties (moderate oxygen content, specific functional groups), the patent maximizes the utilization efficiency of each Pt atom, achieving high activity with reduced overall Pt loading
Solution Approach 2:
The patent uses the modified carbon support as an intermediary that enhances the catalytic activity of Pt. The carbon support with tailored surface properties (heteroatom doping, controlled oxidation) acts as a mediator that promotes oxygen reduction reaction activity, allowing lower Pt loadings to achieve the same performance as higher loadings on conventional supports
3Productivity
If the focus is on intrinsic activity of Pt alloys, then the catalytic activity is improved, but the impact of catalyst support on proton and gas transfer is neglected, leading to suboptimal overall performance
Solution Approach 1:
The patent applies universality by designing a carbon support that performs multiple functions simultaneously: it serves as a structural carrier for Pt particles, provides active sites for catalysis through heteroatom doping, facilitates proton transfer through controlled surface oxygen content, and enables gas diffusion through optimized porosity. This multi-functional support comprehensively addresses all aspects of fuel cell performance
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 method results in a Pt-based electrocatalyst with enhanced activity and stability, reducing Pt usage and improving fuel cell performance by optimizing the interaction between the catalyst and support, thereby addressing the limitations of existing Pt-based catalysts.
Implementation Method 1
subjecting the catalyst support to reductive treatment includes annealing the catalyst support in a reducing environment
Implementation Method 2
subjecting a catalyst support to reductive treatment
Implementation Method 3
reacting a Pt-containing precursor and a N-containing precursor in a liquid medium in the presence of the catalyst support to form PtN nanostructures
Implementation Method 4
reacting a Pt-containing precursor and a N-containing precursor in a liquid medium to form PtN nanostructures affixed to the catalyst support
Implementation Method 5
the method further comprises annealing the PtN nanostructures affixed to the catalyst support in a reducing environment
Data Source
AI summary
Provided herein are improved Pt-based electrochemical catalyst (or electrocatalyst) for ORR, exhibiting a combination of high activity and high stability, along with reduced usage of scarce Pt. The Pt-based electrocatalyst is loaded on a catalyst support, which is developed through carbon engineering to impart improved performance to the Pt-based electrocatalyst.