Highly Efficient and Selective Photocatalytic CO 2 Reduction to CO in Water by a Cobalt Porphyrin Molecular Catalyst

作者：Arnau Call, Mihaela Cibian, Keiya Yamamoto, Takashi Nakazono, Kosei Yamauchi, Ken Sakai · 发表于：ACS Catalysis · 年份：2019 · DOI：10.1021/acscatal.8b04975 · 被引用次数：244 · 研究领域：CO2 Reduction Techniques and Catalysts、Advanced Photocatalysis Techniques、Porphyrin and Phthalocyanine Chemistry

The performance of a water-soluble cobalt porphyrin ([{ meso -tetra(4-sulfonatophenyl)porphyrinato}cobalt(III)], CoTPPS) as a catalyst for the photoreduction of CO 2 in fully aqueous media has been investigated under visible light irradiation using [Ru(bpy) 3 ] 2+ as a photosensitizer and ascorbate as a sacrificial electron donor. CO is selectively produced (>82%) with high efficiency (926 TON CO; TON CO = turnover number for CO). Upon optimization, selectivities of at least 91% are achieved. Efficiencies up to 4000 TON CO and 2400 h –1 TOF CO (TOF CO = turnover frequency for CO) are reached at low catalyst loadings, albeit with loss in selectivity. This work successfully demonstrates the ability of CoTPPS to perform highly efficient photoreduction of CO 2 in water while retaining its high selectivity for CO formation.