Electrochemical reduction of CO₂ is an attractive technique for reducing CO₂ emission and converting it into valued commodity chemicals. Most of catalysts such as metal In exhibit selectivity towards formation of C1 products, whereas C2 products suffer from high overpotential, low efficiency or poor selectivity. Here, polyoxometalate (SiW₁₁Mn)-assisted metal In was proposed as an efficient electrocatalyst for electrochemical reduction of CO₂ into acetic acid and formic acid with Faradaic efficiencies of 72.1 % and 6.1 % respectively. It overcomed the low selectivity limitation of In for C2 products, converting CO₂ to acetic acid over formic acid with an onset potential of −0.8 V vs. Ag/AgCl (−0.35 vs RHE). The superior selectivity of the SiW₁₁Mn-assisted In catalyst studied herein maybe originates from SiW₁₁Mn effect.

电化学还原CO ₂是减少CO ₂排放并将其转化为有价值的商品化学品的一种有吸引力的技术。大多数催化剂，例如金属In，表现出对形成C1产物的选择性，而C2产物具有高过电势，低效率或差的选择性。在此，提出了多金属氧酸盐（SiW ₁₁ Mn）辅助的金属In作为将CO ₂电化学还原成乙酸和甲酸的有效电催化剂，其法拉第效率分别为72.1％和6.1％。克服了In对C2产物转化CO ₂的低选择性限制在甲酸上生成乙酸，相对于Ag / AgCl的起始电位为-0.8 V（对RHE为-0.35）。本文研究的SiW ₁₁ Mn助催化剂的优异选择性可能源自SiW ₁₁ Mn效应。