PH sensor with automatic water storage and replenishment

A pH sensor with automatic water storage and replenishment, comprising a substrate, a working electrode, a reference electrode, a first piezoelectric micropump, a water storage device, and a second piezoelectric micropump, wherein

• the working electrode, the reference electrode, the first piezoelectric micropump, the water storage device, and the second piezoelectric micropump are arranged on the substrate;
• the working electrode and the reference electrode are each connected to a bonding pad through an electrode lead;
• the second piezoelectric micropump, the water storage device, and the first piezoelectric micropump are sequentially communicated, wherein the working electrode is configured to receive a liquid from the water storage device via an outlet of the first piezoelectric micro pump.