The spectroelectrochemical measurements in Fig. suggest that short EDOT oligomers are not surface active during the initial stages of interfacial electrosynthesis at an applied Δ o w 𝜙 of +0.4 V. The latter is close to the positive edge of the PPW, and the interfacial surface tension decreases significantly approaching both the PPW's positive and negative edges. Conversely, an applied Δ o w 𝜙 of -0.1 V is comparatively further from the negative edge of the PPW leading to a relative increase in interfacial surface tension during the potential step from +0.4 to -0.1