The schematic representation for silica-facilitated proton transfer and phosphoric acid adsorption site transfer for HT-PEMFCs. (IMAGE)
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In HT-PEMFCs, hydrogen is oxidized at the anode to generate protons, which are transported to the cathode through the proton conductor phosphoric acid in the high-temperature proton exchange membrane. The SiO2 in the cathode CNT@SiO2-Pt catalyst can induce the transfer of phosphoric acid from the active site of Pt to the adjacent SiO2. The specific adsorption and immobilization of phosphoric acid on the SiO2 form an efficient proton hopping transport network in the catalytic layer, and successfully achieves a power density of more than 1 W cm-2 for high-temperature proton exchange membrane fuel cells.
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