| HER | Hydrogen evolution reaction |
| Pt | Platinum |
| FE-SEM | Field-emission scanning electron microscopy |
| EDX | Energy-dispersive X-ray spectroscopy |
| XRD | X-ray diffraction |
| XPS | X-ray photoelectron spectroscopy |
| SCE | Saturated calomel electrode |
| RHE | Reversible hydrogen electrode |
| EIS | Electrochemical impedance spectroscopy |
| JNFC | Non-faradaic current density |
| CNFC | Non-faradaic capacitance |
| ECSA | electrochemically active surface area |
| CV | Cyclic voltammetry |
| LSV | Linear sweep voltammetry |
| TOF | Turnover frequency |
| η | Overpotential |
| Rct | Charge-transfer resistance |
| F | Faraday’s constant |
| A | Geometric area of the electrode |
| N | Number of moles of active catalyst |
| n | Number of electrons transferred per hydrogen molecule |
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