Chinese Journal of Catalysis ›› 2026, Vol. 83: 219-230.DOI: 10.1016/S1872-2067(26)64967-4

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Simultaneous value-added utilization of photogenerated electrons and holes via plasmon-exciton-phonon synergy in Mo2N QDs/ZnIn2S4 heterojunction

Jinhe Lia,1, Xiaxi Yaob,1, Xiaohui Yua, Xiaosong Zhouc, Wei Rena, Lele Wanga, Weikang Wanga, Qinqin Liua,*()   

  1. aSchool of Materials Science & Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
    bSchool of Materials Engineering, Suzhou University of Technology, Changshu 215500, Jiangsu, China
    cSchool of Chemistry and Chemical Engineering, Lingnan Normal University, Zhanjiang 524048, Guangdong, China
  • Received:2025-08-21 Accepted:2025-11-28 Online:2026-04-18 Published:2026-03-04
  • Contact: Qinqin Liu
  • About author:First author contact:1Contributed to this work equally.
  • Supported by:
    National Natural Science Foundation of China(22472069);National Natural Science Foundation of China(22102064);Postgraduate Research & Practice Innovation Program of Jiangsu Province(KYCX24_3947)

Abstract:

The persistent challenge impeding photocatalytic advancement lies in achieving simultaneous efficient utilization of photogenerated carriers for dual value-added reactions. This study demonstrates the synergistic interplay of plasmon-exciton-phonon interactions within non-metallic plasmonic Mo2N quantum dots anchored on ultrathin ZnIn2S4 nanosheets (0D/2D Mo2N/ZnIn2S4), which simultaneously enhances photocatalytic hydrogen evolution and selective oxidation of 4-methoxybenzyl alcohol to 4-methoxybenzaldehyde. Integrated experimental, operando spectroscopic, and theoretical analyses reveal triple cooperative mechanisms: localized surface plasmon resonance at Mo2N sites generates high-energy hot electrons through plasmon-exciton coupling, significantly reducing the apparent activation energy to 4.87 kJ·mol-1; quantum confinement synergizing with the 0D/2D ohmic-junction concentrates excitons at nanoscale interfaces, enabling prolonged carrier lifetime; meanwhile, directional photon-to-phonon energy conversion induces uniform photothermal heating (ΔT = 55.9 °C), kinetically accelerating dehydrogenation while balancing redox half-reactions. This synergy achieves sacrificial-free co-production rates of 96.3 mmol·h-1·g-1 H2 and 38.7 mmol·h-1·g-1 4-methoxybenzaldehyde with 13.7% apparent quantum efficiency at 420 nm, establishing a new paradigm for solar-driven chemical refineries via precision plasmon-phonon engineering.

Key words: Photocatalysis, H2 evolution, 4-Methoxybenzyl alcohol oxidation, Localized surface plasmon resonance, Photon-phonon cooperativity