Evaluation of Electrolyzer Efficiency by Motion Tracking of Chemically Driven Electromagnets

Water splitting is one of the most efficient approaches to clean hydrogen production. Assessing electrolyzer performance requires evaluating the efficiency of electrocatalysts. Herein, a motion‐based method is presented that combines bipolar electrochemistry (BE) with dynamic, chemically induced electromagnets to probe the electrocatalytic efficiency of water splitting. With this approach, redox reactions are triggered in a wireless way at both extremities of a solenoid‐shaped electrolyzer composed by different metal catalysts. The resulting current follows the helical coil, producing a concentrated magnetic field that drives rotational motion in the presence of an external magnetic field without traditional ferromagnetic materials. A direct correlation between the angular velocity and the catalyst efficiency is obtained. Furthermore, by applying an alternating electric field, the resulting device behaves as a direction‐sensitive dynamic electrolyzer, with its angular velocity determined by which catalyst serves as the anode or cathode, respectively. This strategy provides a simple, wireless readout for catalyst screening, offering a new tool for hydrogen generation research.