Mechanically Induced Contact‐Electro‐Catalysis: Free Radical Generation, Reaction Pathways, and Catalytic Applications

Contact‐electro‐catalysis (CEC) represents an emerging interdisciplinary field that combines physical mechanics with chemical catalysis to drive chemical reactions via electron transfer across solid‐liquid‐gas triple‐phase interfaces. Although it holds great potential, the basic mechanisms behind these chemical processes and the principles of mechanical excitation are not fully understood, which makes further development and practical use of CEC challenging. This review provides a comprehensive overview of free radical generation and reaction pathways in CEC. It begins with an exploration of the contact electrification mechanism and the impact of various mechanical forces, with a particular emphasis on the role of ultrasound in generating powerful interfacial electric fields. The review then compares the electric double layer in CEC with that in conventional systems. Next, the pathways for free radicals’ formation are discussed in detail, along with the influence of various atmospheric conditions on radical generation and reaction mechanisms. Additionally, strategies for integrating CEC with complementary systems to enhance catalytic performance are examined, and the review also summarizes the applications of CEC in environmental and energy‐related fields, underscoring its importance for the future advancement of CEC technology.