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An Exceptionally Efficient Co−Co2P@N, P-Codoped Carbon Hybrid Catalyst for Visible Light-Driven CO2-to-CO Conversion

Yong Xu,Jiang Mo,Zi-Cheng Fu,Su Liu,Zhi Yang,Wen-Fu Fu

Graphical A hybrid photocatalyst consisting of Co and Co 2 P nanoparticles embedded in N, P-codoped carbon nanosheets was used in a visible light-driven system for CO 2 -to-CO conversion. The catalytic system displayed a high CO production rate of up to 35 000 μmol h −1 g −1 with CO selectivity of 79.1 % in the first 3 h of reaction. Linear CO production at an exceptionally high rate of 63 000 μmol h −1 g −1 was observed in the first 1 h of photocatalytic reaction. Artificial photosynthesis has attracted wide attention, particularly the development of efficient solar light-driven methods to reduce CO 2 to form energy-rich carbon-based products. Because CO 2 reduction is an uphill process with a large energy barrier, suitable catalysts are necessary to achieve this transformation. In addition, CO 2 adsorption on a catalyst and proton transfer to CO 2 are two important factors for the conversion reaction, and catalysts with high surface area and more active sites are required to improve the efficiency of CO 2 reduction. Here, a visible light-driven system for CO 2 -to-CO conversion is reported, which consists of a heterogeneous hybrid catalyst of Co and Co 2 P nanoparticles embedded in carbon nanolayers codoped with N and P (Co-Co 2 P@NPC) and a homogeneous Ru II -based complex photosensitizer. The average generation rate of CO of the system was up to 35 000 μmol h −1 g −1 with selectivity of 79.1 % in 3 h. Linear CO production at an exceptionally high rate of 63 000 μmol h −1 g −1 was observed in the first hour of reaction. Inspired by this highly active catalyst, Co@NC and Co 2 P@NPC materials were also synthesized and their structure, morphology, and catalytic properties for CO 2 photoreduction were explored. The results showed that the nanoparticle size, partially adsorbed H 2 O molecules on the catalyst surface, and the hybrid nature of the systems influenced their photocatalytic CO 2 reduction performance.