Figure 2.
The electrocatalytic performance in electron and hole branches on the ambipolar WSe2 device. a) A schematic of the setup showing a single gold pad connected with a WSe2 flake used as the working electrode. b) Photography of the electrochemical microcell. c) The electrical transfer properties of the WSe2 device in the air, in the electrolyte and after HER reaction, respectively. d) Typical polarization curves measured for the WSe2 device when the gate voltage is 0, −20, and +10 V, respectively. The electrocatalytic measurement is in 0.5 m H2SO4 with a scan ratio of 5 mV s−1. The inset is the corresponding Tafel plot.