AI Article Synopsis
- The study focuses on reducing platinum (Pt) usage in polymer electrolyte fuel cells, especially at the cathode, while maintaining performance through innovative catalyst design and membrane-electrode assemblies (MEAs).
- It introduces a new preparation technique called the nanocapsule method to control the size and placement of Pt particles, enhancing their effectiveness in the fuel cell.
- Advanced evaluation methods assessing the utilization of Pt, mass activity, and effectiveness led to improved performance, linked to uniform particle distribution on specialized carbon black supports.
Article Abstract
In polymer electrolyte fuel cells, it is essential to minimize Pt loading, particularly at the cathode, without serious loss of performance. From this point of view, we will report an advanced concept for the design of high performance catalysts and membrane-electrode assemblies (MEAs): first, the evaluation of Pt particle distributions on both the interior and exterior walls of various types of carbon black (CB) particles used as supports with respect to the "effective surface (ES)"; second, control of both size and location of Pt particles by means of a new preparation method (nanocapsule method); and finally, a new evaluation method for the properties of MEAs based on the Pt utilization (UPt), mass activity (MA), and effectiveness of Pt (EfPt), based on the ES concept. The amounts of Pt catalyst particles located in the CB nanopores were directly evaluated using the transmission electron microscopy, scanning electron microscopy and corresponding three-dimensional images. By use of the nanocapsule method and optimization of the ionomer, increased MA and EfPt values for the MEA were achieved. The improvement in the cathode performance can be attributed to the sharp particle-size distribution for Pt and the highly uniform dispersion on the exterior surface of graphitized carbon black (GCB) supports.
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| http://dx.doi.org/10.1039/c3cp51801a | DOI Listing |
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