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. 2015 Aug 21;1(7):e1500259. doi: 10.1126/sciadv.1500259

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Copyright © 2015, The Authors

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 8 — (A) Polarization curves of carbon fiber cloth, NiS_x/C, MoS₂/C, and different Ni-Mo-S/C in neutral electrolyte. GSA, geometric surface area. (B) Corresponding Tafel plots obtained using slow-scan rate polarization curves. (C) Electrochemical impedance spectra of different electrodes at −0.3 V versus RHE. Inset: Equivalent circuit used for data analyses. CPE, constant-phase element; Z_W, Warburg impedance. (D) Plot of charge transport resistance of different samples.