Fig. 3

Catalytic activities of the Au₂₅ clusters. a CVs of GC electrode modified with as-prepared Au₂₅, Au₂₄Cu₁ and Au₂₄Cd₁ clusters in O₂-saturated 0.01 M PBS (pH 7.4). Scanning rate: 0.050 V s⁻¹. b LSV of GC electrode modified with as-prepared Au₂₅, Au₂₄Cu₁ and Au₂₄Cd₁ clusters in O₂-saturated 0.01 M PBS (pH 7.4). Scanning rate: 0.005 V s⁻¹. c Compared the ORR activities of Au₂₅, Au₂₄Cu₁ and Au₂₄Cd₁ clusters at the potential of −0.8 V. d CVs of GC electrode modified with as-prepared Au₂₅, Au₂₄Cu₁ and Au₂₄Cd₁ clusters in the presence of 9.8 mM H₂O₂ in N₂-saturated 0.01 M PBS (pH 7.4). Scanning rate: 0.050 V s⁻¹. e LSV of GC electrode modified with as-prepared Au₂₅, Au₂₄Cu₁ and Au₂₄Cd₁ clusters in the presence of 9.8 mM H₂O₂ in N₂-saturated 0.01 M PBS (pH 7.4). Scanning rate: 0.010 V s⁻¹. Rotation rate: 1600 rpm. f Compared the H₂O₂ scavenging activities of clusters at the potential of -0.8 V