The electrocatalytic reduction of CO₂ with In is severely hindered by its complex multi-electron reaction pathway for C2 products and the high reaction overpotential. Polyoxometalates (POM) with the ability to transport and store electrons and protons have great potential to overcome these limitations. The Keggin-type POM [SiW₉V₃O₄₀]⁷⁻ (SiW₉V₃) and metal indium were selected to build the electrocatalytic CO₂ reduction system. It overcomed the low selectivity limitation of In for C2 products, converting CO₂ to acetic acid over formic acid with an onset potential of −1.0 V vs. Ag/AgCl. The Faradaic efficiency for the production of acetate was up to 96.5% at −1.15 V vs. Ag/AgCl (−0.71 V vs. RHE) with nearly 96% selectivity. The electrochemical experimental studies and XPS spectra reveal that the V-center in SiW₉V₃ primarily facilitates the conversion of CO₂ into acetate and formate.

In对CO ₂的复杂多电子反应途径和高反应超电势严重阻碍了In对CO ₂的电催化还原。具有传输和存储电子和质子能力的多金属氧酸盐（POM）具有克服这些局限性的巨大潜力。选择Keggin型POM [SiW ₉ V ₃ O ₄₀ ] ^7-（SiW ₉ V ₃）和金属铟来构建电催化CO ₂还原系统。克服了In对C2产物转化CO _2的选择性低的局限性在甲酸上生成乙酸，相对于Ag / AgCl的起始电位为-1.0V。相对于Ag / AgCl，在-1.15 V时，乙酸盐的法拉第效率高达96.5％，相对于Ag / AgCl则为-0.71 V（相对于RHE），选择性接近96％。电化学实验研究和XPS光谱表明，SiW ₉ V ₃中的V中心主要促进了CO ₂转化为乙酸盐和甲酸盐。