Rapid‐Response Electromagnetic Metamaterial Enabling Round‐The‐Clock Electrified CO ₂ Methanation

Abstract CO 2 methanation offers a practical solution for sustainable, renewable energy storage and long‐term space exploration missions. However, conventional direct solar‐driven photothermal systems suffer from thermal response hysteresis and dynamic temperature fluctuations, undermining methane yield stability and limiting their applicability under high gas hourly space velocity (GHSV) conditions. Herein, a round‐the‐clock CO 2 methanation system is pioneered that integrates photovoltaic power generation with induction heating by a rapid‐response electromagnetic metamaterial (EEM), serving as both a catalyst and a susceptor. The EMM assembles single atoms, nanoclusters, and nanotubes into a macrostructure by a 3D‐printed strategy and rapidly reaches the methanation temperature of 300 °C within just 36 s at a frequency of 297 kHz with an input power of 461 W, achieving a substantially great CH 4 space‐time‐yield of 821 mmol g cat −1 h −1 at an ultra‐high GHSV of 150 000 mL g cat −1 h −1 . The outdoor photovoltaic‐driven induction heating system maintains stable production with a cumulative CH 4 output of 1373.2 L over one week, shielding the system from environmental instability. Notably, this system exhibits a solar‐to‐chemical energy efficiency of 13% and achieves 20% energy savings compared with conventional electric heating technologies, offering a prospective avenue for efficient and stable CO 2 methanation.