Figure 2
Acceleration of HER on the Pt/Si nanodiode electrodes. (a,b) Cyclic voltammetry (CV) and (c) linear sweep voltammetry (LSV) curves of a 10 nm Pt/Si nanodiode electrode measured at different bias voltages applied between the Pt film and the n-Si substrate (scan rates of 0.1 V·s−1 for CV and 1 mV·s−1 for LSV). (d) Enhancement of the cathodic current of the HER resulting from the nanodiode electrode bias. (e) Typical electrochemical impedance spectroscopy (EIS) data for a 10 nm Pt/Si nanodiode electrode. Inset: Equivalent circuit used for fitting the EIS data. (f) Typical quadrupole mass spectrometry spectra of the gas evolved from the forward-biased 10 nm Pt/Si nanodiode electrodes. The spectrum of ambient air before the experiment is shown for reference. All measurements are carried out in 0.5 M H2SO4.
