fig2

Figure 2. Schematic illustrations of (A) a commercial in situ electrochemical LC-(S)TEM sample holder^[71], (B) an in situ electrochemical liquid cell placed in the optical path of TEM, and (C) an electrochemical microchip with micro-fabricated counter electrode (CE), working electrode (WE) and reference electrode (RE). The WE is made of glassy carbon, while the CE and RE are both made of Pt. The radial distance between RE and WE is ~100 μm and the radial distance between RE and CE is ~500 μm. TEM: Transmission electron microscopy; LC-(S)TEM: liquid cell (scanning) transmission electron microscopy.