Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 11, Issue 8, Pages 2957-2963Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1cy00028d
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Funding
- National Key Research and Development Program of China [2020YFB1506002]
- National Natural Science Foundation of China [91534205, 22022502, 21436003, 21776024]
- opening Project of State Key Laboratory of Advanced Chemical Power Sources [SKL-ACPS-C-30]
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A low-Pt-loading membrane electrode assembly has been developed, featuring a 3D carbon framework with embedded PtZn intermetallic nanoparticles and Nafion ionomers for efficient mass transfer and high power output in PEMFCs. The PEMFC fabricated with this assembly achieves a high Pt utilization of 145 mg(Pt) kW(-1) and excellent stability during continuous operation, representing a significant technological breakthrough for future applications.
Proton-exchange membrane fuel cells (PEMFCs) are a clean, zero-emission, and promising energy technology for future use. The scale-up of PEMFCs drives up the cost of Pt resources, a key catalytic material for fuel cells; this inevitably necessitates the development of low-Pt-usage and high-Pt-utilization technology for PEMFCs. Herein, we report a low-Pt-loading membrane electrode assembly (MEA) featuring a three-dimensional (3D) carbon framework with embedded PtZn intermetallic nanoparticles (iNPs) and vacuum-aspirated Nafion ionomers. Such a framework ensemble shows efficient mass transfer for various species (protons, O-2, and water) to the PtZn iNPs. As a result, the maximum power output reaches 826 mW cm(-2) at a loading of 60 mu g(Pt) cm(-2) for a PEMFC fabricated with the as-prepared MEA, and a high Pt utilization of 145 mg(Pt) kW(-1) is realized, which is 1.6 times greater than that of a commercial Pt/C catalyst. Moreover, excellent stability is achieved at low Pt loading (60 mu g(Pt) cm(-2)), with no decay occurring during 300 h of continuous operation.
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