Simultaneous Voltammetric Determination of Uric Acid, Xanthine, and Hypoxanthine Using CoFe₂O₄/Reduced Graphene Oxide-Modified Electrode

Figure 5

XPS spectrum of CoFe₂O₄/rGO: (a) survey spectrum; (b) XPS spectrum Co2p; (c) XPS spectrum Fe2p; (d) XPS spectrum O1s; (e) XPS spectrum C1s.

(a)

(b)

(c)

(d)

(e)