High product specificity and production rate are regarded as key success parameters for large-scale applicability of a (bio)chemical reaction technology. Here, we report significant performance enhancement in acetate formation from CO2, reaching comparable productivity levels industrial fermentation processes (volumetric yield). A biocathode current density -102 ± 1 m(-2) an acetic acid 685 30 (g day(-1)) have been achieved this study. recoveries 94 2% the CO2 supplied sole carbon source 100...

Enhanced performance for the bioelectrosynthesis of acetate from carbon dioxide is achieved with a new three-dimensional CNT-modified scaffold electrode.

The enhancement of microbial electrosynthesis (MES) acetate from CO2 to performance levels that could potentially support practical implementations the technology must go through optimization key design and operating conditions. We report higher proton availability drastically increases production rate, with pH 5.2 found be optimal, which will likely suppress methanogenic activity without inhibitor addition. Applied cathode potential as low -1.1 V versus SHE still achieved 99% electron...

Abstract Electron‐transfer pathways occurring in biocathodes are still unknown. We demonstrate here that high rates of acetate production by microbial electrosynthesis mainly driven an electron flux from the electrode to carbon dioxide, via biologically induced hydrogen, with (99±1) % recovery into acetate. Nevertheless, is shown occur exclusively within biofilm. The producers, putatively Acetoanaerobium , showed remarkable ability consume a H 2 before it could escape At zero wastage gas,...

Bioelectrochemical systems encompass a range of electrochemical wherein microorganisms are used as biocatalysts. These from classical microbial fuel cells to novel electrosynthesis processes. The future practical applications relies on increased performance. In all cases the development new electrode materials is essential overcome low current densities bioelectrochemical systems. Here we describe biocompatible, highly conductive three-dimensional scaffold electrode, NanoWeb–RVC, with...

ConspectusCarbon-based products are crucial to our society, but their production from fossil-based carbon is unsustainable. Production pathways based on the reuse of CO2 will achieve ultimate sustainability. Furthermore, costs renewable electricity decreasing at such a high rate, that expected be main energy carrier 2040 onward. Electricity-driven novel processes convert into chemicals need further developed. Microbial electrosynthesis biocathode-driven process in which electroactive...

We report a fully integrated core-shell nanoparticle system responsive to glucose. The is comprised of self-assembled glucose oxidase and an osmium molecular wire on Au nanoparticles. Characterization the functional nanoparticles by spectroscopy, quartz crystal microbalance electrochemical techniques has shown that catalytically active shell structure as designed all components are in multilayer shell. Furthermore, amperometric reagentless detection contactless photonic biosensing Os(II)...

We present a comprehensive study of the direct electron transfer reaction soluble PQQ-GDH from Acinetobacter calcoaceticus. Wild-type PQQ-sGDH nonspecifically adsorbed on carbon cryogel electrodes retained its enzymatic activity for glucose and maltose oxidation at pH 7.2 37 °C. The cyclic voltammograms in absence substrate showed 2 redox peaks that suggest two-step, one-electron oxidation/reduction PQQ. Calibration curves linear amperometric response wide concentration range, including...

In the present study we have shown that carbonaceous micro/macrocellular foams can be used for efficient and stable non-specific enzyme entrapment. this context, Bilirubin Oxidase adsorbed into porous electrode is able to reduce O2 water electrons are transferred directly from without need of a redox mediator. The reduction current several days under continuous operation therefore consider very promising candidates construction 3-dimensional biofuel cell cathodes. Mediator free, preparation...

We propose here a new method for the direct and continuous measurement of O2 glucose generated during photosynthesis. Our system is based on amperometric enzyme biosensors comprising immobilized redox enzymes (glucose oxidase (GOx) bilirubin (BOD)) hydrogels "wiring" reaction centers to electrodes. found that these electrodes, implanted into living plant, responded in real time visible light as an external stimulus triggering They proved be highly selective fast enough may valuable tool...

Three-dimensional carbonaceous electrodes with interconnected hierarchical porosity are prepared using Si(HIPE) exotemplating matrices, and modified glucose oxidase Os polymer. The electrooxidation current is 13-fold bigger on the porous electrode than glassy carbon for same enzyme loading. Therefore they proposed devices needing high output, such as biofuel cells.

The extraction properties of mono-hydroxy alcohols (2-butyl-1-octanol, 2-ethyl-1-hexanol, 1-octanol) and di-hydroxy (2-ethyl-1,3-hexanediol, 2-butyl-2-ethyl-1,3-propanediol, 2-methyl-2,4-pentanediol) towards boron, potassium, lithium, sodium, calcium magnesium ions were investigated as a function pH phase volume ratio (O/A) by considering an aqueous with composition mimicking the brine from Salar de Hombre Muerto in Argentina, Lithium Triangle. are soluble kerosene sulfonated whereas only...

Due to their resistance biological wastewater treatment, iodinated X-ray contrast media (ICM) have been detected in municipal effluents at relatively high concentrations (i.e., up 100 μg L(-1)), with hospitals serving as main source. To provide a new approach for reducing the of ICMs wastewater, electrochemical reduction three-dimensional graphite felt and doped palladium nanoparticles was examined means deiodination common ICM diatrizoate. The presence significantly enhanced removal...

We report unprecedented high current densities for the enzymatic oxidation of glucose already at 0 V versus Ag/AgCl. The modified electrodes were made by assembling pyrroloquinoline quinone (PQQ)-soluble dehydrogenase (PQQ-sGDH) from Acinetobacter calcoaceticus with osmium-based redox polymers and a cross-linker. Both mediators are poly(4-vinylpyridine) (PVP) polymer Os complexes tethered to backbone via long C chains, giving flexibility mobility inside hydrogels. Current larger than 1 mA...

An electrochemical reactor for the extraction of lithium from natural brine has been designed. It comprises two 3D porous packed bed electrodes and a separator filled with electrolyte. The are conducting petroleum coke particles covered respectively LiMn2O4 selective to ions polypyrrole anions. operates in steps: First, extract Li+ Cl− by intercalation adsorption. Then, after rinsing water is dilute LiCl recovery solution recovered reversing electrical current. A mathematical model...

Supramolecular organized multilayers composed of glucose oxidase (GOx) and osmium-derivatized poly(allylamine) redox polymer have been self-assembled electrostatically from Os-polyelectrolyte solutions variable pH (5.5-8.8) leading to a decrease the linear charge density in PAH-Os with increasing pH. The layer-by-layer enzyme were studied by ellipsometry, quartz crystal microbalance, AFM, cyclic voltammetry, electrocatalytic oxidation beta-D-glucose. At higher adsorption solution pH, an...