Anchoring Ultrasmall Pt Nanocrystals onto Carbon Nanohorn-Decorated 3D Graphene Networks to Boost Methanol Oxidation Reaction

Figure 6

(a) The chronoamperometric curves of the Pt/(CNH)₅-G₅, Pt/CNH, Pt/G, Pt/CNT, and Pt/C electrodes in 0.5 M H₂SO₄ with 1 M CH₃OH solution. (b) The methanol oxidation mass activities of the diverse electrodes before and after the chronoamperometry tests. (c) Chronopotentiometric curves of the Pt/(CNH)₅-G₅, Pt/CNH, Pt/G, Pt/CNT, and Pt/C electrodes in 0.5 M H₂SO₄ with 1 M CH₃OH solution. (d) AC impedance spectra of the Pt/(CNH)₅-G₅, Pt/CNH, Pt/G, Pt/CNT, and Pt/C electrodes at open circuit potentials with an amplitude of 10 mV in 0.5 M H₂SO₄ with 1 M CH₃OH solution. (e) is the zoom-in view of (d). (f) AC impedance spectrum and the fitting curve of Pt/(CNH)₅-G₅. The inset in (f) is the equivalent circuit used to fit the impedance spectra.

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