AQA GCSE Chemistry Paper 1 2025 – 400 Free Practice Questions to Pass the Exam

The main purpose of the electrolyte in a hydrogen-oxygen fuel cell is to allow ions to move between the electrodes. In a fuel cell, the electrolyte is a medium that conducts ions but is typically an insulator for electrons. This movement of ions is crucial for the operation of the fuel cell because it enables the chemical reactions to occur that produce electricity.

Specifically, in a hydrogen-oxygen fuel cell, hydrogen gas is oxidized at the anode, releasing protons (H+ ions) and electrons. The electrolyte facilitates the flow of these protons to the cathode, where they combine with oxygen and electrons to form water. This process generates electrical energy. Therefore, the ability of the electrolyte to permit ion movement while keeping the electron flow separate is essential for converting chemical energy into electrical energy efficiently.

During this process, the electrolyte does not play a significant role in heat production, although some heat may be generated as a byproduct of the fuel cell's operation. Its primary function is not to facilitate electron flow, as that is managed by the external circuit connecting the electrodes. Additionally, while oxidation occurs at the anode during the reactions in a fuel cell, the electrolyte’s main function is not to prevent it but to enable the necessary ionic conduction