Apparatus, methods, and systems related to a spectroelectrochemical cell apparatus including a cell body that has a first volume, a transparent sample window defined in the cell body, the transparent sample window defining an optical path through the cell body and having a second volume, a working electrode extending through the cell body and into the transparent sample window in the optical path, a counter electrode extending through the cell body, a reference electrode extending through the cell body, a sample inlet extending through the cell body, a solvent inlet extending through the cell body, an electrolyte inlet extending through the cell body, an ionic fluid inlet extending through the cell body, a detection species inlet extending through the cell body, a fluid outlet extending through the cell body, and a fluid mixer located within the cell body.