Search results for "PBO2"
showing 6 items of 6 documents
Dating archeological lead artifacts from measurement of the corrosion content using the voltammetry of microparticles.
2011
A methodology for dating archeological lead artifacts based on the voltammetry of microparticles is described. This methodology is based on the comparison of the height of speci¿c voltammetric features from PbO2 and PbO corrosion products formed under long-term alteration conditions. Calibration of the method was performed with the help of a series of well-documented lead pieces from the funds of di¿erent museums of the Comunitat Valenciana (Spain) covering from the ¿fth century B.C. to present day. The variation of peak currents with the time of corrosion can be¿tted to the same potential rate law as that found by Reich (R = 0.070 ( 0.005), using measurements on the Meissner fraction in th…
High-performance of PbO2 nanowire electrodes for lead-acid battery
2014
Abstract PbO2 nanowires were obtained by template electrodeposition in polycarbonate membranes and tested as positive electrode for lead-acid battery. Nanowires were grown on the same material acting as current collector that was electrodeposited too. The nanostructured electrodes were assembled in a zero-gap configuration using commercial negative plate and separator. Cell performance was tested by galvanostatic charge/discharge cycles in a 5 M H2SO4 aqueous electrolyte. PbO2 nanostructured electrodes were able to deliver at 1C rate an almost constant capacity of about 190 mAh g−1 (85% of active material utilization), close to the theoretical value (224 mAh g−1). The nanowire array provide…
ULTRAFAST LEAD ACID BATTERIES USING NANOSTRUCTURED ELECTRODES
2012
Accumulo e conversione di energia per via elettrochimica attraverso batterie piombo-acido con elettrodi nano-strutturati
L’attività di ricerca si è focalizzata sullo studio delle batterie al piombo acide, largamente utilizzate nel campo della trazione e dell’accumulo di energia da fonti rinnovabili. La loro grande limitazione è legata al peso, intrinsecamente dovuto all’alto peso molecolare del piombo stesso, e al basso grado di utilizzazione del materiale attivo, che non le rendono competitive in altri possibili ambiti come la trazione elettrica o in dispositivi portatili. Per superare questa limitazione l’approccio è stato quello di rendere porosa la materia attiva mediante l’uso di array ordinati di nanostrutture ottenute per elettrodeposizione; mediante l’uso di uno stampo, è possibile ottenere elettrodi …
Performance analysis of nanostructured PbO2 electrodes in lead-acid batteries
2013
Recent improvements in PbO2 nanowire electrodes for lead-acid battery
2015
Abstract Lead oxide nanowires are an attractive alternative to conventional pasted electrodes, owing to their high surface area leading to high specific energy batteries. Here, we report the performance of template electrodeposited PbO 2 nanowires used as positive electrodes. Nanostructured electrodes were tested at constant charge/discharge rate from 2 C to 10 C, with a cut-off potential of 1.2 V and discharge depth up to 90% of the gravimetric charge. These new type of electrodes are able to work at very high C-rate without fading, reaching an efficiency of about 90% with a very good cycling stability. In particular, after an initial stabilization, a specific capacity of about 200 mAh g −…