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. 2021 Mar 24;7(13):eabd6647. doi: 10.1126/sciadv.abd6647

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Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 3 — (A) Polarization curves of Rh NSs, Rh/C, and commercial Pt/C. Linear sweep voltammetry was carried out in 1.0 M KOH aqueous solution at scan rate of 5.0 mV s⁻¹. (B) Overpotentials at current density of 10 mA cm⁻² (left) and exchange current densities (right) of Rh NSs, Rh/C, and commercial Pt/C. The error bars were obtained on the basis of the measurements of five samples. (C) Comparison of the overpotentials of Rh NSs, Rh/C, commercial Pt/C, and previously reported electrocatalysts at current density of 10 mA cm⁻² in 1.0 M KOH aqueous solution. (D) Tafel plots obtained from the corresponding polarization curves of Rh NSs, Rh/C, and commercial Pt/C. (E) Durability test of Rh NSs. The polarization curves were recorded before and after 10,000 potential cycles in 1.0 M KOH aqueous solution from 0.1 to −0.1 V (vs. RHE).