Electrochemical interfaces invariably generate unipolar electromotive force because of the unidirectional nature of electrochemical double layers. Herein we show an unprecedented generation of a time varying bipolar electric field between identical half-cell electrodes induced by tailored interfacial migration of magnetic particles. The periodic oscillation of a bipolar electric field is monotonically correlated with velocity-dependent torque, opening new electrochemical pathways targeting velocity monitoring systems.

中文翻译：

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电化学风速传感器

由于电化学双层的单向性质，电化学界面总是产生单极电动势。本文中，我们显示了空前的变化，即在相同的半电池电极之间由时空变化产生的双极性电场，这是由磁性粒子的界面迁移引起的。双极电场的周期性振荡与速度相关的转矩单调相关，从而开辟了针对速度监测系统的新电化学途径。