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(a) HER LSVs acquire in 1.0 M KOH. Respective Nyquist plots (b) with contour maps of HER overpotentials at 10 (c) and 50 mA cm−2 (d), Tafel slope (e), and HER capacitance (f) of Ni(OH)2 catalyst with varying Co and Fe contents. Reproduced with permission from ref. [85] (Copyright 2018, ACS).
