Hydroenergy Inspiring Large‐Scale Piezoelectric Catalysis for Seawater Hydrogen Evolution

The piezoelectric effect presents a promising avenue for harvesting and utilizing low‐grade mechanical energy. However, challenges from lacking matched industrial equipment and maintaining catalytic performance during scaling up impede the engineering of piezo‐catalysis. Here, utilizing mechanical energy of water to inspire piezoelectricity, a successful attempt to large‐scale piezo‐catalysis seawater H2 evolution was reported for the first time, exhibiting an efficiency of 36.82% for converting mechanical energy to hydrogen energy. A scaling up test with 20 L seawater was conducted, yielding a H2 production rate of 0.73 L/h which just occupying 0.7 m2. This performance (1.04 L/h/m2) exceeding the large‐scale photocatalytic pure water H2 production by panel reactor array (0.18~0.25 L/h/m2) reported in 2021[1]. Additionally, the H2 evolution activity of the 20 L system showed no obvious decline compared with the 50 mL system before scaled‐up, owing to the utilization of ternary piezo‐catalysts system, which capitalized on the synergistic coupling effect of kinetics and thermodynamics. This attempt provides a prototype for pursuing large‐scale piezo‐catalysis and practical engineering application.