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. 2016 Oct 18;7:13216. doi: 10.1038/ncomms13216

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Copyright © 2016, The Author(s)

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(a) Polarization curve of W₂C/MWNT in comparison with 20 wt% Pt/C, WC/MWNT, WO_x/MWNT or MWNTs alone. (b) Tafel plot of W₂C/MWNT in comparison with 20 wt% Pt/C and WC/MWNT. (c) Electrochemical impedance spectrum of W₂C/MWNT at η=180 mV in comparison with WC/MWNT. (d) Polarization curve of W₂C/MWNT before and after 10,000 potential cycles. The inset shows the change of HER cathodic current density at −0.12 V versus RHE with respect to the number of potential cycles.