| EDLCs | Electrical double-layer capacitors |
| PCs | Pseudocapacitors |
| TMO/Hs | Transition metal oxides/hydroxides |
| ESR | Equivalent series resistance |
| Ksp | Solubility constant |
| SCE | Saturated calomel electrode |
| SEM | Scanning electron microscope |
| TEM | Transmission electron microscope |
| SAED | Selected area electron diffraction |