Au/TiO2 photocatalysts with controlled Au sizes show a rise-to-plateau dependence in photocatalytic methane coupling, reaching 14.9 mmol g−1 h−1 C2+ at 89.1% selectivity near 7.8 nm. Structural and spectroscopic analyses identify face-rich Au on larger particles, reinforced by stronger Au-TiO2 interaction, as the dominant active motif for C–C coupling.
C. Yuan, Z. Zhang, X. Liu, S. Qin, L. He, T. Yu, X. Yu, B. Gu and W. Fang, Chem. Commun., 2026, Accepted Manuscript , DOI: 10.1039/D6CC00574H
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