electrochemical systems
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2022 ◽  
Author(s):  
Wenbin Sun ◽  
Jiechen Li ◽  
Wen Gao ◽  
Luyao Kang ◽  
Fengcai Lei ◽  
...  

The electrocatalytic urea oxidation reaction (UOR) has attracted substantial research interests during the past few years owing to its critical role in coupled electrochemical systems for energy conversion, for example,...


2022 ◽  
Vol 334 ◽  
pp. 08008
Author(s):  
Pierangela Cristiani ◽  
Laura Malavola ◽  
Silvia Franz ◽  
Massimiliano Bestetti ◽  
Giuliana D’Ippolito ◽  
...  

Thermotoga neapolitana is a hyperthermophilic bacterium that can metabolize glucose and several organic wastes in hydrogen and lactate at a temperature of 80°C. Their high performance in producing hydrogen at so high a temperature as 80°C suggests a potential energy application of them where hydrogen is an important element of the process. In this view, experimentation of a T.neapolitana strain is carried out in double-chamber electrochemical systems. The aim is to explore the interaction of these bacteria with the anode and the cathode, stressing their capability to survive in presence of a polarized electrode which can drastically change the pH of the media. A culture enriched of 5 g/L of glucose, under CO2 pressure (80 °C) was used to fill both the anodic and cathodic compartments of the electrochemical system, applying a voltage of 1.5 V between the anode and the cathode. The test lasted ten days. Results clearly indicate that bacteria colonize both electrodes, but the glucose metabolism is completely inhibited in the anodic compartments. On the contrary, metabolism is stimulated in the cathodic compartment. Bacteria are alive on the electrodes in the pH interval of 3 - 9.


2021 ◽  
Author(s):  
Xing Ding ◽  
Theophilus Kobina Sarpey ◽  
Shujin Hou ◽  
Batyr Garlyyev ◽  
Weijin Li ◽  
...  

2021 ◽  
Author(s):  
Adeleke Maradesa ◽  
Baptiste Py ◽  
Emanuele Quattrocchi ◽  
Francesco Ciucci

Electrochemical impedance spectroscopy (EIS) is a tool widely used to study the properties of electrochemical systems. The distribution of relaxation times (DRT) has emerged as one of the main methods for the analysis of EIS spectra. Gaussian processes can be used to regress EIS data, quantify uncertainty, and deconvolve the DRT, but current implementations do not constrain the DRT to be positive and can only use the imaginary part of EIS spectra. Herein, we overcome both issues by using a finite Gaussian process approximation to develop a new framework called the finite Gaussian process distribution of relaxation times (fGP-DRT). The analysis on artificial EIS data shows that the fGP-DRT method consistently recovers exact DRT from noise-corrupted EIS spectra while accurately regressing experimental data. Furthermore, the fGP-DRT framework is used as a machine learning tool to provide probabilistic estimates of the impedance at unmeasured frequencies. The method is further validated against experimental data from fuel cells and batteries. In short, this work develops a novel probabilistic approach for the analysis of EIS data based on Gaussian process, opening a new stream of research for the deconvolution of DRT.


Author(s):  
Matteo Grattieri ◽  
Rossella Labarile ◽  
Gabriella Buscemi ◽  
Massimo Trotta

AbstractPhotosynthetic purple non-sulfur bacteria (PNB) have been widely utilized as model organisms to study bacterial photosynthesis. More recently, the remarkable resistance of these microorganisms to several metals ions called particular interest. As a result, several research efforts were directed toward clarifying the interactions of metal ions with PNB. The mechanisms of metal ions active uptake and bioabsorption have been studied in detail, unveiling that PNB enable harvesting and removing various toxic ions, thus fostering applications in environmental remediation. Herein, we present the most important achievements in the understanding of intact cell-metal ions interactions and the approaches utilized to study such processes. Following, the application of PNB-metal ions interactions toward metal removal from contaminated environments is presented. Finally, the possible coupling of PNB with abiotic electrodes to obtain biohybrid electrochemical systems is proposed as a sustainable pathway to tune and enhance metal removal and monitoring. Graphic abstract


Water ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3087
Author(s):  
Itzel Celeste Romero-Soto ◽  
Celestino García-Gómez ◽  
Luis Humberto Álvarez-Valencia ◽  
Edna Rosalba Meza-Escalante ◽  
Luis Alonso Leyva-Soto ◽  
...  

Response surface methodology was investigated to determine the operational parameters on the degradation of Congo red dye (CR) and chemical oxygen demand (COD) in two electrochemical systems evaluated individually on effluent pretreated by an up-flow anaerobic sludge blanket (UASB) reactor. The UASB reactor was fed with 100 mg L−1 of CR and was operated for 12 weeks at different hydraulic residence times (HRTs) of 12 h, 10 h, and 8 h. Once stabilized at an HRT of 8 h, the effluent was collected, homogenized, and independently treated by electrooxidation (EO) and electrocoagulation (EC) cells. On both electrochemical systems, two electrode pairs were used; solid for EC (Fe and stainless-steel) and mesh electrodes for EO (Ti/PbO2 and Ti), and the effect of intensity (A), recirculation flow rate (mL min−1), and experimental time (min) was optimized on response variables. The maximum efficiencies of sequential systems for COD degradation and CR decolorization were 92.78% and 98.43% by EC and ≥99.84% and ≥99.71% by EO, respectively. Results indicate that the coupled systems can be used in textile industry wastewater treatment for the removal of dyes and the decolorized by-products.


2021 ◽  
Vol MA2021-02 (59) ◽  
pp. 1766-1766
Author(s):  
Austin Gabhart ◽  
Raymond Chow ◽  
Joseph Buckley ◽  
George J. Nelson

2021 ◽  
Vol MA2021-02 (51) ◽  
pp. 1503-1503
Author(s):  
Thomas F Fuller ◽  
John N. Harb

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