Figure 15.

HER Performances of Pd⁰/GDY. a) Photographs of Pd⁰/GDY, GDY, and CF, which was used as the working electrode for the HER test. b) Photograph displaying the flexibility of Pd⁰/GDY. c) Photograph of the established three‐electrode system. d) Polarization curves of Pd⁰/GDY, Pd NP/GDY, GDY, CF, and Pt/C. e) Overpotentials at 10 mA cm² of other recent ACs and several bulk catalysts. f) Mass activity of Pd⁰/GDY and Pt/C (inset: mass activity collected at overpotentials of 0.05 and 0.2 V). g) Corresponding Tafel slope of the catalysts in a). h) Tafel slopes of other recent ACs and several bulk catalysts. i) TOF values of Pd⁰/GDY together with those of several recent ACs and bulk catalysts. j) Polarization curves of Pd⁰/GDY before and after 1000 cycle tests. k) Nyquist plots of the catalysts. Reproduced with permission.30 Copyright 2019, Cell Press.