The clean conversion of carbon dioxide and water to a single multicarbon product and O₂ using sunlight via photocatalysis without the assistance of organic additives or electricity remains an unresolved challenge. Here we report a bio-abiotic hybrid system with the non-photosynthetic, CO₂-fixing acetogenic bacterium Sporomusa ovata grown on a scalable and cost-effective photocatalyst sheet consisting of a pair of particulate semiconductors (La and Rh co-doped SrTiO₃ (SrTiO₃:La,Rh) and Mo-doped BiVO₄ (BiVO₄:Mo)). The biohybrid effectively produces acetate (CH₃COO^–) and oxygen (O₂) using only sunlight, CO₂ and H₂O, achieving a solar-to-acetate conversion efficiency of 0.7% at ambient conditions (298 K, 1 atm). The photocatalyst sheet oxidizes water to O₂ and provides electrons and hydrogen (H₂) to S. ovata for the selective synthesis of CH₃COO^– from CO₂. To demonstrate utility in a closed carbon cycle, the solar-generated acetate was used directly as feedstock in a bioelectrochemical system for electricity generation. These semi-biological approaches thus offer a promising strategy for sustainably and cleanly fixing CO₂ and closing the carbon cycle.

在没有有机添加剂或电力的帮助下，利用阳光通过光催化将二氧化碳和水清洁转化为单一的多碳产物和 O _{2仍然是一个未解决的挑战。}在这里，我们报告了一种非光合作用、固定 CO ₂产乙酸细菌Sporomusa ovata的生物非生物混合系统，该系统在由一对颗粒半导体（La 和 Rh 共掺杂 SrTiO ₃ ）组成的可扩展且具有成本效益的光催化剂片材上生长（ SrTiO ₃ :La,Rh) 和 Mo 掺杂的 BiVO ₄ (BiVO ₄ :Mo))。生物混合物有效地产生乙酸盐 (CH ₃ COO ^– ) 和氧气 (O ₂) 仅使用阳光、CO ₂和 H ₂ O，在环境条件下（298 K，1 atm）实现 0.7% 的太阳能到乙酸盐的转换效率。光催化剂片将水氧化成 O _2并为S. ovata提供电子和氢 (H ₂ )，用于从 CO ₂选择性合成 CH ₃ COO ^-。为了证明在封闭碳循环中的效用，太阳能产生的醋酸盐直接用作生物电化学系统中的原料用于发电。因此，这些半生物方法为可持续和清洁地固定 CO ₂和关闭碳循环提供了有前景的策略。