Effect of Added Graphitized CB on Both Performance and Durability of Pt/Nb-SnO2Cathodes for PEFCs
Source abstract
Abstract
The single cell performances of polymer electrolyte fuel cells (PEFCs) using Pt catalyst supported on Nb-SnO 2 (Pt/Nb-SnO 2 ) with/without graphitized carbon black (GCB) were compared with that of a cell using Pt/GCB. The Pt-mass specific power of the Pt/Nb-SnO 2 cathode under low humidity conditions was superior to that of the Pt/GCB cathode, because the hydrophilic SnO 2 support helped to increase the proton conductivity of the ionomer, which led to high Pt effectiveness. The addition of GCB to the Pt/Nb-SnO 2 cathode improved the cell performance under high humidity, and the Pt-mass specific power value reached more than 10 kW g Pt −1 . The improvement conditions was attributed to the formation of gas diffusion paths by adding the hydrophobic GCB. The Pt/Nb-SnO 2 cathodes, with/without GCB, had greater durability than that of the Pt/GCB cathode during the startup / shutdown potential sweep evaluation. The migration of Pt particles on the Nb-SnO 2 support was suppressed by the high stability of Nb-SnO 2 and strong orientation between Pt and Nb-SnO 2 support. The degradation of GCB in the Pt/Nb-SnO 2 cathode was smaller than that in the Pt/GCB cathode because of the absence of Pt on the added GCB. Therefore, the added GCB was still able to provide gas diffusion paths even after extensive cycling.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Fuel Cells and Related Materials · Electrocatalysts for Energy Conversion · Advanced battery technologies research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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