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(a) Proposed mechanism for HER over a Ni and Fe metal hydroxide cluster decorated Pt(111) electrode. The Ni–Fe cluster is proposed to improve the initial water dissociation step (blue arrow), and Pt stimulates the adsorption of hydrogen species and H2 gas evolution (jade arrow). (b) Polarization curves for metal hydroxide clusters deposited on a Pt(111) single crystal in 0.1 M KOH. Reproduced with permission from ref (27). Copyright 2020 Wiley.
