Fig. 3.
TEM images and EDS elemental mapping of Pd/FeOx(OH)2−2x NPs a, b before cycling and c, d after 1000 electrochemical cycles. The scale bar is 5 nm. e Schematic diagram of the alkaline HER reaction process on the surface of core/shell Pd/FeOx(OH)2−2x nanoparticles after electrochemical cycling. f iR-corrected linear sweep voltammogram (LSV) curves. g Turnover frequencies (TOFs) of Pd/FeOx(OH)2−2x NPs and catalysts in the benchmark literature: Pd/C, Pd-CNx, Ni-MoS2, and CoP. h HER activity versus FeOx(OH)2−2x coverage [40]. Copyright 2017, Wiley–VCH