Activation of CO₂ with plasmon induced hot electrons has attracted great attention due to its moderate reaction conditions, but high-efficiency plasmonic catalysts still remains challenging. Herein, we designedly prepared an antenna-reactor plasmonic catalyst with core-shell structure, i.e. sub-nm Pd skin/Au NPs encapsulated within UiO-66-NH₂ (Au@Pd@UiO-66-NH₂-0.5) for CO₂ hydrogenation under light-heat dual activation. Under the photo-thermal synergism, CO₂ can be efficiently converted into CO and the optimal production rate reaches 3737 µmol/g_metal/h at 150 °C. Thereinto, ultrafast transient absorption spectroscopy reveals that the sub-nm Pd skin provides a longer time window for hot electron transfer and efficient retardation of energy dissipation. Theoretical calculations further confirm the significant reductions in HOMO-LUMO gap of CO₂ and reaction energy barrier from CO₂* to COOH* through adsorption of CO₂ on sub-nm Pd skin, promoting its efficiency and selectivity. Our findings provide new insights into design of bimetallic plasmonic catalysts for low-temperature catalysis.

等离子体激元诱导的热电子对CO _2的活化由于其适中的反应条件而引起了极大的关注，但是高效等离子体激元催化剂仍然具有挑战性。在本文中，我们设计制备了具有核-壳结构的天线反应器等离激元催化剂，即。封装在UiO-66-NH ₂（Au @ Pd @ UiO-66-NH ₂ -0.5）中的亚纳米Pd皮肤/ Au NP用于在光热双重激活下进行CO ₂加氢。在光热协同作用下，CO ₂可以有效地转化为CO，最佳生产率达到3737 µmol / g_金属/ h在150°C。其中，超快速瞬态吸收光谱显示亚纳米Pd皮肤为热电子转移和能量耗散的有效阻滞提供了更长的时间窗口。理论计算进一步证实了CO _2的HOMO-LUMO间隙的显着减少以及通过CO ₂在亚纳米Pd皮肤上的吸附而使CO ₂ *转化为COOH *的反应能垒，从而提高了其效率和选择性。我们的发现为低温催化双金属等离子体激元催化剂的设计提供了新的见识。