期刊
CHEMISTRY OF MATERIALS
卷 31, 期 19, 页码 7812-7820出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b00999
关键词
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资金
- National Natural Science Foundation of China [21720102003, 21875233, 51934203]
- National Key R&D Program of China [2018YFB1502301]
- Key Technologies R&D Program of Anhui Province [18030901079]
- Key Research Project of HNNU [2017xj04zd]
- EPSRC [EP/M014371/1]
- EPSRC [EP/M014371/1] Funding Source: UKRI
Polymer electrolyte membrane fuel cells can generate high power densities with low local emissions of pollutants. Optimal ionomer-Pt/C catalyst interactions in the electrodes enable the efficient generation and transport of ions and electrons required for high fuel cell performances. Critical durability issues involve agglomeration of the Pt/C nanoparticles (Pt/C NPs) and ionomer during discharging. Our novel approach involves ionomer cross-linking immobilization for the fabrication of durable catalyst layers for application in alkaline anion exchange membrane fuel cells (AEMFCs). Pt/C NP catalysts are employed alongside a poly(2,6-dimethyl-p-phenylene oxide)-(PPO)-based quaternary ammonium ionomer (containing terminal styrenic side-chain groups) to form porous catalyst layers. Following thermally initiated cross-linking of the terminal vinyl groups, an interconnected ionomer network forms conductive shells around the Pt/C aggregates. Ex situ catalytic activity and in situ durability tests demonstrate that this immobilization strategy inhibits Pt/C NP coalescence without sacrificing catalyst layer porosity. An initial demonstration of an H-2/O-2 AEMFC containing the new CBQPPO@Pt/C cathode shows that high peak power densities can be achieved (1.02 W cm(-2) at 70 degrees C, raising to 1.37 W cm(-2) with additional 0.1 MPa back-pressurization).
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