化学
催化作用
光催化
金属有机骨架
钴
营业额
光化学
氢氧化物
加合物
无机化学
金属
物理化学
有机化学
吸附
作者
Yu Wang,Ning‐Yu Huang,Jian‐Qiang Shen,Pei‐Qin Liao,Xiao‐Ming Chen,Jie‐Peng Zhang
摘要
Converting CO2 into fuels via photochemical reactions relies on highly efficient and selective catalysts. We demonstrate that the catalytic active metal center can cooperate with neighboring hydroxide ligands to boost the photocatalytic CO2 reduction. Six cobalt-based metal-organic frameworks (MOFs) with different coordination environments are studied at the same reaction condition (photosensitizer, electron donor, water/organic mixed solvent, and visible light). In pure CO2 at 1.0 atm, the MOFs bearing μ-OH- ligands neighboring the open Co centers showed CO selectivities and turnover frequencies (TOFs) up to 98.2% and 0.059 s-1, respectively. More importantly, their TOFs reduced only ca. 20% when the CO2 partial pressure was reduced to 0.1 atm, while other MOFs reduced by at least 90%. Periodic density functional theory calculations and isotope tracing experiments showed that the μ-OH- ligands serve not only as strong hydrogen-bonding donors to stabilize the initial Co-CO2 adduct but also local proton sources to facilitate the C-O bond breaking.
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