Excessive emission of carbon dioxide (CO₂) into the environment in addition to depletion of natural fossil fuel leads to the environmental pollution and energy crisis. Therefore, the photelectroreduction of CO₂ is a suitable and versatile technique to convert CO₂ gas into valuable organic products. Herein, Ru/Mn/Co (1:13:13) supported anatase TiO₂ has been prepared using precipitation method and tested for photoelectrochemical reduction of CO₂ into formic acid in aqueous and N,N-dimethylformamide (DMF) under visible light. Incorporation of Ru, Mn, and Co successfully reduced the bandgap to 1.66 eV and shifted the light absorption to the visible region with effective suppression of charge carriers recombination which is injurious to the photocatalytic reaction resultant in better photocatalytic performance. The photocurrent density in the aqueous medium is higher than DMF with a value of 12 μA cm⁻² vs. Ag/AgCl. Stable photocurrent form chronoamperometry indicative of better product selectivity toward formic acid with Faradaic efficiency in aqueous and DMF are 0.8% and 2.23%, respectively.

除了消耗天然化石燃料之外，过量向环境中排放二氧化碳（CO ₂）还导致环境污染和能源危机。因此，CO ₂的光电还原是将CO ₂气体转化成有价值的有机产物的合适且通用的技术。本文中，使用沉淀法制备了Ru / Mn / Co（1:13:13）负载的锐钛矿型TiO ₂并进行了光电化学还原CO _2的测试。在可见光下溶于水溶液和N，N-二甲基甲酰胺（DMF）中。Ru，Mn和Co的掺入成功地将带隙减小到1.66eV，并且通过有效地抑制电荷载流子复合而将光吸收转移到可见光区域，这不利于光催化反应，从而导致更好的光催化性能。与Ag / AgCl相比，水性介质中的光电流密度高于DMF，其值为12μAcm ^-2。稳定的光电流形式计时电流法表明在水和DMF中法拉第效率对甲酸有更好的产品选择性，分别为0.8％和2.23％。