Co<sup>0</sup>−Co<sup>δ+</sup> Interface Double‐Site‐Mediated C−C Coupling for the Photothermal Conversion of CO<sub>2</sub> into Light Olefins
Shangbo Ning, Honghui Ou, Yaguang Li, Cuncai Lv, Shufang Wang, Dingsheng Wang, Jinhua Ye
Abstract
Abstract Solar‐driven CO 2 hydrogenation into multi‐carbon products is a highly desirable, but challenging reaction. The bottleneck of this reaction lies in the C−C coupling of C 1 intermediates. Herein, we construct the C−C coupling centre for C 1 intermediates via the in situ formation of Co 0 −Co δ+ interface double sites on MgAl 2 O 4 (Co−CoO x /MAO). Our experimental and theoretical prediction results confirmed the effective adsorption and activation of CO 2 by the Co 0 site to produce C 1 intermediates, while the introduction of the electron‐deficient state of Co δ+ can effectively reduce the energy barrier of the key CHCH* intermediates. Consequently, Co−CoO x /MAO exhibited a high C 2–4 hydrocarbons production rate of 1303 μmol g −1 h −1 ; the total organic carbon selectivity of C 2–4 hydrocarbons is 62.5 % under light irradiation with a high ratio (≈11) of olefin to paraffin. This study provides a new approach toward the design of photocatalysts used for CO 2 conversion into C 2+ products.