fig4

Figure 4. (A) A schematic diagram of MXene@CF electrode preparation and MES operation. SEM images of (B) plain CF, (C and D) MXene@CF, and (E) MXene@CF biofilm. (F) Accumulated concentration profile for the MES products acetic acid, butyric acid, and propionic acid (from left to right) for a MES system operated at a fixed cathode potential of -0.8 V using plain and MXene-coated CF. This figure is quoted with permission from Tahir et al.^[117].