Supplementary Information Files for 'Acetate production from inorganic carbon (HCO3-) in photo-assisted biocathode microbial electrosynthesis systems using WO3/MoO3/g-C3N4 heterojunctions and Serratia marcescens species.'

Supplementary Information Files for 'Acetate production from inorganic carbon (HCO3-) in photo-assisted biocathode microbial electrosynthesis systems using WO3/MoO3/g-C3N4 heterojunctions and Serratia marcescens species.'<br>Abstract:The efficient production of acetate from HCO3− is demonstrated in a photo-assisted microbial electrosynthesis system (MES) incorporating a WO3/MoO3/g-C3N4 heterojunction photo-assisted biocathode supporting Serratia marcescens Q1 electrotroph. The WO3/MoO3/g-C3N4 structured electrode consisting of a layer of g-C3N4 coated on graphite felt decorated with W/Mo oxides nanoparticles exhibited stable photocurrents, 4.8 times higher than the g-C3N4 electrode and acetate production of 3.12 ± 0.20 mM/d with a CEacetate of 73 ± 4 % and current of 2.5 ± 0.3 A/m2. Photo-induced electrons on the conduction bands of WO3/MoO3/g-C3N4 favoured hydrogen evolution, which was metabolized by S. marcescens with HCO3− to acetate, while the holes were refilled by the electrons travelling from the anode. Such mechanism reduced the interfacial resistances creating a supplementary driving force leading to higher acetate production. The biocompatible components of WO3/MoO3/g-C3N4 synergistically couple light-harvesting and further catalyze S. marcescens to acetate from HCO3−, providing a feasible strategy for achieving sustainable high rates of acetate production.<br>

本文件为《使用WO3/MoO3/g-C3N4异质结与粘质沙雷氏菌（Serratia marcescens）的光辅助生物阴极微生物电合成系统中以无机碳（HCO3-）合成乙酸盐》的补充信息文件。<br>摘要：本研究在搭载负载粘质沙雷氏菌（Serratia marcescens）Q1电营养菌的WO3/MoO3/g-C3N4异质结光辅助生物阴极的微生物电合成系统（MES）中，实现了以碳酸氢根（HCO3-）为原料高效合成乙酸盐。该WO3/MoO3/g-C3N4结构化电极以负载钨/钼氧化物纳米颗粒的石墨毡为基底，表面覆有类石墨相氮化碳（g-C3N4）涂层，展现出稳定的光电流，其强度为纯g-C3N4电极的4.8倍；配套系统的乙酸盐产率可达3.12 ± 0.20 mM/d，乙酸盐电流效率（CEacetate）为73 ± 4%，电流密度为2.5 ± 0.3 A/m²。WO3/MoO3/g-C3N4导带上的光生电子可促进析氢反应，粘质沙雷氏菌可利用该反应产物与碳酸氢根代谢合成乙酸盐；而价带上的空穴则由从阳极迁移而来的电子补充。该机制降低了界面电阻，形成额外驱动力，从而提升了乙酸盐产率。WO3/MoO3/g-C3N4的生物相容性组分可协同实现光捕获，并进一步催化粘质沙雷氏菌以碳酸氢根为原料合成乙酸盐，为实现可持续的乙酸盐高产率制备提供了可行策略。