Inside Back Cover: Hybrid‐Secondary Ion Mass Spectrometry Probes Atomic‐Scale Insight Into Selective C─C Bond Cleavage in PET Upcycling

In the Research Article e1863949, Jyh-Chiang Jiang, Jong Sung Jin, Myong Yong Choi, and co-workers developed CO2 laser-engineered Ru single-atoms on NiO regulate reaction intermediates and direct selective formate production from ethylene glycol, a key polyethylene terephthalate (PET)-derived monomer. Advanced hybrid-SIMS and operando spectroscopy provide molecular-level insights into PET upcycling, offering new principles for catalyst design and sustainable circular-carbon technologies.