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Reversible Hydrogen Electrode (RHE)
Reversible Hydrogen Electrode (RHE)
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Product Description
Reversible Hydrogen Electrode (RHE)
Product Overview
The Reversible Hydrogen Electrode (RHE) is a primary reference electrode widely used in electrochemical research, particularly in electrocatalysis, water splitting, CO₂ reduction, and pH-dependent electrochemical studies. Unlike conventional reference electrodes, the RHE provides a direct potential reference linked to the hydrogen redox equilibrium, eliminating the need for external pH correction during data interpretation.
This RHE is designed for high-precision laboratory and engineering applications, offering excellent stability, reproducibility, and compatibility with acidic, neutral, and alkaline electrolytes. Its modular glass body and standardized dimensions allow seamless integration into a wide range of electrochemical cells, including flow cells, gas diffusion cells, and H-type cells.
Operating Principle
The RHE is based on the hydrogen redox reaction:
H2 ⇌2H++2e−
At equilibrium, the electrode potential is governed by the Nernst equation:
ERHE =ESHE∘ −0.059×pH(25∘C)
Because the hydrogen activity is fixed at unity, the RHE potential automatically shifts with pH, making it a universal reference electrode for comparing electrochemical data across different electrolyte environments.
Key Advantages
•Direct pH-compensated reference No post-measurement pH correction required when reporting potentials versus RHE.
•Universal applicability Suitable for acidic, neutral, and alkaline electrolytes.
•High potential accuracy and stability Ideal for kinetic studies, Tafel analysis, and long-term electrolysis experiments.
•Excellent compatibility Designed to fit standard electrochemical ports and flow-cell configurations.
•Research-grade construction Glass body with precise dimensions ensures chemical resistance and reproducibility.
Structural Design
•Upper Section
Outer diameter: 12 mm
•Length: 35 mm
•Houses the internal hydrogen electrode assembly and electrical connection
Lower Glass Tube Section
•Outer diameter: 6 mm
•Multiple length options available to accommodate different cell depths
Total Electrode Length (Typical Options)
~135 mm
~165 mm
~215 mm
Dimensions are measured manually; minor deviations may occur. Actual product dimensions prevail.
Product Specifications
| Item | Specification |
| Product Name | Reversible Hydrogen Electrode (RHE) |
| Reference System | H₂ / H⁺ equilibrium |
| Potential Definition | E = −0.059 × pH (25 °C) |
| Body Material | High-purity glass |
| Upper Diameter | 12 mm |
| Upper Length | 35 mm |
| Lower Diameter | 6 mm |
| Total Length Options | ~135 mm / ~165 mm / ~215 mm |
| Operating Temperature | Laboratory ambient conditions |
| Electrolyte Compatibility | Acidic, neutral, alkaline solutions |
| Typical Use | Reference electrode for electrochemical measurements |
Typical Applications
•Electrocatalysis research (HER, OER, ORR)
•CO₂ reduction reaction (CO₂RR)
•Water electrolysis studies
•pH-dependent electrochemical analysis
•Gas diffusion electrode (GDE) systems
•Flow cells and membrane-based electrochemical cells
•Benchmarking catalytic activity across different electrolytes
Compatibility Notes
•Compatible with H-type cells, flow cells, gas diffusion electrolysis cells, and photoelectrochemical systems
•Can replace Ag/AgCl or Hg/HgO references when RHE-based reporting is required
•Recommended for experiments where accurate potential comparison across pH values is critical
Package Contents
•Reversible Hydrogen Electrode (RHE) × 1
•Protective cap (installed)
•Ready for laboratory use