Photothermal Conversion of CO2 with Tunable Selectivity Using Fe-Based Catalysts: From Oxide to Carbide

作者：Chuqiao Song, Xi Liu, Ming Xu, Daniel Masi, Yigui Wang, Yuchen Deng, Mengtao Zhang, Xuetao Qin, Kai Feng, Jie Yan, Jing Leng, Zhaohua Wang, Yao Xü, Binhang Yan, Shengye Jin, Dongsheng Xu, Zhen Yin, Dequan Xiao, Ding Ma · 发表于：ACS Catalysis · 年份：2020 · DOI：10.1021/acscatal.0c02244 · 被引用次数：193 · 研究领域：Advanced Photocatalysis Techniques、Catalytic Processes in Materials Science、Catalysts for Methane Reforming

Conversion of CO 2 into fuels via solar energy would be a promising strategy to reduce CO 2 emissions and produce value-added carbon compounds. However, the development of efficient light-harvesting and photocatalytic systems remains a significant challenge because of scarcity of low-cost and high-efficiency catalysts in CO 2 conversion. Herein, a tunable selectivity in photothermal CO 2 conversion was demonstrated over a series of Fe-based catalysts developed through a simple hydrogenation/carbonization treatment with commercial Fe 3 O 4 as a precursor. The Fe 3 O 4 catalyst demonstrated a full selectivity toward CO (about 100%) and 11.3 mmol g –1 h –1 activity for the photothermal catalytic conversion of CO 2 . More importantly, the pure-phase θ-Fe 3 C produced remarkably high selectivity toward hydrocarbon products (>97%) and superior activity (10.9 mmol g –1 h –1 ) in the photothermal conversion of CO 2 . Meanwhile, it is found that the selectivity toward a hydrocarbon (CH x ) can be modulated by the extent of hydrogenation/carbonization of the Fe 3 O 4 precursor. In addition, we demonstrated the vital influence of the nonthermal effect on the enhanced catalytic performance with the Fe-based catalysts during the photothermal conversion of CO 2 .