Figure 3. (IMAGE)

Science China Press

Figure 3.

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(a) Free energy diagram of HER at equilibrium potential for Pt-Ni-Cu, Pt-Co-Cu, Pt-Cu, and Cu. The charge density difference of H* adsorption on (b) Pt-Ni-Cu, (c) Pt-Co- Cu, (d) Pt-Cu and (e) Cu. Yellow (blue) isosurfaces denote an increase (decrease) of 0.01 e/Å-3 for electronic density.

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