Solar driven reduction of CO₂ using Pt-Cu/C as a catalyst in a photoelectrochemical cell: experiment and mechanism...

Carbon supported nano-metal catalysts are expected to improve CO₂ reduction selectivity and efficiency due to the addition of more active sites and enhancement of electron transport ability. In this study, HKUST-1 was pyrolyzed and decorated with Pt to prepare Pt-Cu/C catalysts. The catalytic effect of the catalysts with different Pt contents in the CO₂ photoeletrochemical reduction reaction (CO₂PRR) were compared. The total carbon atom conversion rate in CO₂PRR experiments using Pt-Cu/C catalysts first increased to a peak when using 1.6 wt% Pt-Cu/C catalyst and then decreased with the increase of Pt content. The 1.6 wt% Pt-Cu/C catalyst showed good hydrogen evolution reaction (HER) inhibiting ability compared with other Pt-Cu/C catalysts. Density functional theory (DFT) calculations were conducted to give an insight into the CO₂PRR mechanism on some possible active sites in Pt-Cu/C catalysts. The result demonstrated that HER was more likely to be inhibited on the Cu/Pt active surface and at the same time CO₂PRR was promoted.