Fig. 7: Relationship between metal electronegativity and electrochemical performance. | Nature Communications

Fig. 7: Relationship between metal electronegativity and electrochemical performance.

From: Unraveling the electronegativity-dominated intermediate adsorption on high-entropy alloy electrocatalysts

Fig. 7

a HER polarization curves obtained on FeCoNiXRu/CNFs (X = Cr, Mn, and Cu) in 1.0 M KOH electrolyte. b Correlation between the HER overpotentials at 100 mA cm−2, Tafel slopes, and the electronegativities of metals X (Cr, Mn, and Cu). c The d-orbital projected density of states (PDOS) of Fe, Co, Ni, Mn, Ru, and FeCoNiMnRu. d Comparison of PDOS of FeCoNiXRu (X = Mn, Cr, Cu) HEA. e Reaction energy profile for water dissociation at Co sites of FeCoNiMnRu, FeCoNiCrRu, and FeCoNiCuRu HEA surfaces. f Correlation between the energy barrier for H2O dissociation at different metal sites and the electronegativities of metals (Cr, Mn, and Cu). g Gibbs free energy (ΔGH*) profiles at Ru sites on the FeCoNiMnRu, FeCoNiCrRu, and FeCoNiCuRu HEA surfaces. h Correlation between ΔGH* at different metal sites and the electronegativities of metals X (Cr, Mn, and Cu).

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