Room-Temperature Preparation of Cobalt-Based Electrocatalysts through Simple Solution Treatment for Selectively High-Efficiency Hydrogen Evolution Reaction in Alkaline or Acidic Medium

<div>(a) LSV polarization curves for HER and (b) the corresponding Tafel slopes of bare Ni foam, CoxOy/NF, and Pt sheet in 1 M NaOH (pH = 14). (c) Chronoamperometry curves of the long-term stability of the CoxOy/NF electrode at a static overpotential of 80 mV in 1 M NaOH. (d) Polarization curves obtained over CoxOy/NF before and after potential sweeps between −0.2 and +0.2 V vs. RHE for 3000 cycles with a scan rate of 0.1 V/s.</div>

Journal of Nanomaterials

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Figure 5

Figure 5: Room-Temperature Preparation of Cobalt-Based Electrocatalysts through Simple Solution Treatment for Selectively High-Efficiency Hydrogen Evolution Reaction in Alkaline or Acidic Medium 

Figure 5 | Room-Temperature Preparation of Cobalt-Based Electrocatalysts through Simple Solution Treatment for Selectively High-Efficiency Hydrogen Evolution Reaction in Alkaline or Acidic Medium 