This PDF file includes:

• Supplementary Discussion
  
• fig. S1. 3D AFM images of S. oneidensis MR-1 cells.
  
• fig. S2. Yields of different EPS components from MR-1.
  
• fig. S3. CV of S. oneidensis MR-1 cells in the presence (blue line) and absence (red line) of EPS.
  
• fig. S4. UV-vis spectra of EPS from MR-1.
  
• fig. S5. Chronoamperometry i-t test on MR-1 cells.
  
• fig. S6. DPV curves for MR-1 cell pellets treated at 30° and 38°C.
  
• fig. S7. DPV curves for MR-1 cell culture treated at 30° and 38°C.
  
• fig. S8. Effect of different heating temperatures on microbial viability evaluated by flow cytometry.
  
• fig. S9. Yields of different EPS components from strains WS-XY1 and Ps strains.
  
• fig. S10. Live/Dead staining of WS-XY1 and Ps cells after heating treatments.
  
• fig. S11. CV of pure and EPS-depleted cells of WS-XY1 and Ps.
  
• table S1. Size determination of MR-1 cells using a laser particle size analyzer.
  
• table S2. Amperometric i-t test for MR-1 cells.
  
• table S3. Charge calculation based on DPV shown in Fig. 3.
  
• References (39–42)

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