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. 2020 Mar 28;7(10):1903777. doi: 10.1002/advs.201903777

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© 2020 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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a) Polarization curves of NiSn‐A, NiFe_0.5Sn‐A, NiFe_0.5‐A, and Ir/C. b) bar chart for a comparison of TOF of NiSn‐A, NiFe_0.5Sn‐A, NiFe_0.5‐A. c) Tafel plots of NiSn‐A, NiFe_0.5Sn‐A, and NiFe_0.5‐A. d) chronopotentiometry plot of NiFe_0.5Sn‐A. e) Cdl calculations of NiFe_0.5Sn and NiFe_0.5 before and after anodization. f) Nyquist plots of NiSn‐A, NiFe_0.5Sn‐A, NiFe_0.5‐A at 1.53 V. The inset two‐time constant circuit consists of a solution resistance (R _s), two constant phase elements (CPE), a resistance related to surface porosity (R _p) and a charge‐transfer resistance (R _ct).