Fig. 3: Cycling and structural stability of the N-HEI/KB catalysts under HDV conditions. | Nature Communications

Fig. 3: Cycling and structural stability of the N-HEI/KB catalysts under HDV conditions.

From: Sub-angstrom strain in high-entropy intermetallic boosts the oxygen reduction reaction in fuel cell cathodes

Fig. 3

a H2/air fuel cell performance of N-HEI/KB at BOL and different voltage cycles, 0.20 mgPt cm−2 (cathode Pt loadings), H2/air (500/2000 sccm), 80 °C, and 250 kPaabs pressure. The fuel cell resistance (6.65 ± 0.42 mΩ) was obtained from high-frequency resistance measurements. b Current density of N-HEI/KB and commercial Pt/C at 0.7 V under different ADT cycles. c Representative atomic-resolution STEM-HAADF image of N-HEI nanoparticle after 90k ADT cycles, showing multilayers in Pt shell. d Magnified image from the area marked by blue rectangle in c with TM displacement arrows embedded. Scale bars are 2 nm for (c) and 0.5 nm for (d). e Intensity profiles (dots) from scan lines in d with the same color. The solid lines are refined curves using a Gaussian function. The purple and black vertical lines mark the positions of the center of the lattice and TM columns, respectively. The TM displacement remains in the core (blue line and black line), but is suppressed in the Pt shell (red line). Source data for Fig. 3 are provided as a Source Data file.

Back to article page