Buffering effects of supporting electrolytes on pH profiles in electrochemical cells.

ABSTRACT: In electrochemical processes, the pH values at the electrodes affect their potentials, reaction kinetics, product compositions, etc. However, predicting local pH values is complicated due to multi-ion movement between the electrodes and buffering effects of the electrolyte constituents. Here, local pH values in an electrochemical cell are studied with a combined model and experimental approach, focussing on buffering effects of supporting electrolytes. The simulated ion displacements are evaluated with optically measured pH values using a thymol blue pH indicator in a Na₂SO₄-based electrolyte. By including buffering reactions of the pH indicator in the ion transport simulation, the local pH value in the near-neutral area and its temporal change are in precise agreemen

SUBMITTER: Janotta B 

PROVIDER: S-EPMC12432143 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature