fig2

Figure 2. (A) Schematic diagram of alkaline HER electrocatalytic mechanism processes on the Pt electrodes modified with Ni(OH)₂ nanoclusters. Reproduced with permission from^[62]. Copyright 2011, AAAS; (B) Comparison of HER activities for both bare metal surfaces and Ni(OH)₂-modified surfaces in 0.1 M HClO₄ and 0.1 M KOH. Reproduced with permission from^[63]. Copyright 2012, John Wiley and Sons; (C) HOR/HER polarization curves for Pt(111) and Pt(111) modified with Ni(OH)₂; (D) Schematic representation of HOR on Ni(OH)₂/Pt(111); (E) HOR/HER polarization curves for Pt, Ir, and PtRu alloys with 50% Ru and 90% Ru. Reproduced with permission from^[55]. Copyright 2013, Springer Nature; (F) Plot of the simulated (black line) and experimentally measured (blue circles) rates of HER on Pt(111) and Pt(553) with different adsorbed metal atoms versus hydroxide adsorption energy at 0 V_RHE; The orange diamonds correspond to the experimentally measured rate on the Mo* and Re* decorated steps plotted against the DFT calculated potential to oxidize the step. Reproduced with permission from^[65]. Copyright 2020, Springer Nature.