Photocatalytic CO₂ reduction reaction (CO₂-RR) driven by solar energy is one expected “green technology” to produce hydrocarbon, however, the high-valuble C2/Cx-compounds converted from CO₂ face great challenges. Herein, high-selective ethylene production is achieved via photocatalytic CO₂-RR by using plasmonic tungsten oxides as catalyst under solar light irradiation. Tungsten oxides (WO_3-x-2) synthesized by using acid-assisted solvothermal method exhibits thin amorphous surface structure with abundant oxygen vacancies and low-valence tungsten ions (26.1 mol% W⁵⁺ and 7.1 mol% W⁴⁺). Under full-spectrum light irradiation, ethylene generation rate of WO_3-x-2 is 61.6 μmol g ^− 1 h ^− 1 (selectivity of 89.3%) and is 20-fold higher than that of WO_3-x-0 with thick amorphous surface. The amorphous surface of tungsten oxides with abundant defects is clearly observed by atomic-resolution high-angle annular dark field scanning transmission electronic microscopy (HAADF-STEM). Light-dependent photocatalytic results demonstrate the synergetic effect of oxygen vacancies, plasmonic hot electrons and photothermal heating boosting CO₂-RR on tungsten oxide catalysts for ethylene generation. One possible ethylene generation pathway is proposed based on the detected intermediates during CO₂-RR. As far as we known, our work is the first report on plasmonic photocatalytic CO₂-RR for high-selective ethylene generation.

由太阳能驱动的光催化CO ₂还原反应（CO ₂ -RR）是生产碳氢化合物的一种预期的“绿色技术”，但是，由CO ₂转化的高价值C2 / Cx化合物面临巨大挑战。在此，在太阳光照射下，通过使用等离子体激元氧化钨作为催化剂，通过光催化的CO ₂ -RR可以实现高选择性的乙烯生产。用酸辅助溶剂热法合成的钨氧化物（WO _3-x -2）呈现出薄的无定形表面结构，具有丰富的氧空位和低价钨离子（26.1 mol％W ⁵⁺和7.1 mol％W ⁴⁺）。在全光谱光照射下，WO的乙烯生成率_3-X -2是61.6微摩尔克 ^{-  1个} H ^  ^{-  1}（89.3％的选择性），并且是20倍比的WO更高_3-x -0与厚的非晶形表面。通过原子分辨率高角度环形暗场扫描透射电子显微镜（HAADF-STEM）可以清楚地观察到具有大量缺陷的氧化钨的非晶态表面。与光有关的光催化结果表明，氧空位，等离激子热电子和光热加热促进CO ₂ -RR对生成乙烯的氧化钨催化剂具有协同作用。根据CO ₂期间检测到的中间体，提出了一种可能的乙烯生成途径-RR。据我们所知，我们的工作是有关等离子光催化CO ₂ -RR用于高选择性乙烯生成的第一份报告。