What is the function ( or role ) of platinum in electrochemistry in general ? I read a question about platinum in electric potential , and in standard electrode potential ?!

thank you a lot

H2 gas at a pressure of 1 atmosphere bubbled over "black platinum" in a 1 M solution of H^+ is arbitrarily set at zero. Black platinum is platinum with a fine coating of extremely small particles (granules) of Pt. That surface apparently gives better reproducibility than just a pure Pt electrode.

The function of platinum in electrochemistry is primarily as an electrode material. Platinum is widely used as an electrode due to its exceptional physical and chemical properties.

In general, platinum serves as an inert material that does not undergo any chemical reactions during electrochemical processes. It acts as a catalyst, facilitating the transfer of electrons between the electrode and the electrolyte. This makes platinum an ideal material for many electrochemical reactions.

Platinum is commonly used in the construction of both cathodes and anodes in various electrochemical systems such as fuel cells, electrolyzers, and electrochemical sensors. It is particularly suitable for reactions involving gases such as oxygen, hydrogen, or chlorine, where it provides a high surface area for efficient electrochemical reactions.

Moreover, in terms of electric potential, platinum has a stable and well-defined electrode potential. It is often used as a reference electrode material, such as in the standard hydrogen electrode (SHE). The SHE is a reference electrode that establishes a 0 V reference point for measuring other half-cell potentials. Platinum is used in the construction of the SHE due to its ability to catalyze the reversible reaction involving hydrogen gas and protons.

In summary, platinum plays a crucial role in electrochemistry by providing inert and efficient electrode surfaces and serving as a reference material for establishing electric potentials.