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. 2015 Mar 16;6:6567. doi: 10.1038/ncomms7567

Figure 4. Electrochemical characterization.

Figure 4

(a) HER activities for Pt/C, np-CuTi, Ti-free np-Cu control sample and polycrystalline Cu standard in 0.1 M KOH electrolyte. (b) The corresponding Tafel plots.