Pub Date : 2015-05-07DOI: 10.1515/eetech-2015-0001
A. Banerjee, S. Ramasesha, A. Shukla
Abstract Harnessing solar electricity generated through photovoltaic cells with lead-acid batteries remains the most compelling option at present. But lead-acid batteries have encountered problems in photovoltaic installations, mainly due to their premature failure. To circumvent the aforesaid problem, a new technology referred to as substrate-integrated lead-carbon hybrid ultracapacitor with polymeric-silica-gel electrolyte, is developed inhouse and tested for solar-electricity storage for a lighting application. The high-throughput performance tests for the device are conducted at laboratory scale and compatibility of the device for photovoltaic application is evaluated. In doing so, the device is installed with a photovoltaic panel for field test and data are collected from August 2012 through July 2013. The year round field-test data analyzed in the light of the available global-horizontalirradiance data show attractive performance for the device. It is noteworthy that, unlike lead-acid batteries, seasonal variations in solar radiance exhibit little effect on the performance of the device.
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Pub Date : 2015-01-26DOI: 10.2478/eetech-2014-0002
A. Sundar Rajan, M. Ravikumar, K. Priolkar, S. Sampath, A. Shukla
Abstract Nickel-iron and iron-air batteries are attractive for large-scale-electrical-energy storage because iron is abundant, low-cost and non-toxic. However, these batteries suffer from poor charge acceptance due to hydrogen evolution during charging. In this study, we have demonstrated iron electrodes prepared from carbonyl iron powder (CIP) that are capable of delivering a specific discharge capacity of about 400 mAh g−1 at a current density of 100 mA g−1 with a faradaic efficiency of about 80%. The specific capacity of the electrodes increases gradually during formation cycles and reaches a maximum in the 180th cycle. The slow increase in the specific capacity is attributed to the low surface area and limited porosity of the pristine CIP. Evolution of charge potential profiles is investigated to understand the extent of charge acceptance during formation cycles. In situ XRD pattern for the electrodes subsequent to 300 charge/discharge cycles confirms the presence of Fe with Fe(OH)2 as dominant phase.
摘要镍铁电池和铁空气电池因其铁元素丰富、低成本和无毒等优点，在大规模电能存储中具有广泛的应用前景。然而，由于在充电过程中氢的释放，这些电池的充电接受度很差。在这项研究中，我们已经证明了由羰基铁粉(CIP)制备的铁电极能够在100 mA g−1的电流密度下提供约400 mAh g−1的比放电容量，法拉第效率约为80%。电极比容量在形成周期中逐渐增大，在第180次循环时达到最大值。比容量的缓慢增长归因于原始CIP的低表面积和有限的孔隙率。为了了解地层循环过程中电荷接受的程度，研究了电荷电位分布的演化。300次充放电循环后电极的原位XRD图证实了Fe的存在，其中Fe(OH)2为优势相。
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Pub Date : 1900-01-01DOI: 10.1515/eetech-2017-0004
N. Priya, K. Sandhya, Deepthi N. Rajendran
Abstract Ce0.8Gd0.2O2−δ (GDC) and Ce0.8Sm0.2O2−δ (SDC) nanocrystalline materials are prepared by a solid state reaction method. The synthesized nano crystalline solid solutions have cubic fluorite structure as evident from XRD patterns. The materials are qualitatively analyzed by FTIR. The morphology, size and shape of grains etc. are identified from the SEM images. The grain size of GDC is smaller than that of SDC. The better morphology is obtained for GDC. Hence, this is electrically characterized. The activation energy is calculated from the slope of Arrhenius plot (showing variation of conductivity with temperature).
{"title":"Study on Electrical conductivity and Activation Energy of doped Ceria nanostructures","authors":"N. Priya, K. Sandhya, Deepthi N. Rajendran","doi":"10.1515/eetech-2017-0004","DOIUrl":"https://doi.org/10.1515/eetech-2017-0004","url":null,"abstract":"Abstract Ce0.8Gd0.2O2−δ (GDC) and Ce0.8Sm0.2O2−δ (SDC) nanocrystalline materials are prepared by a solid state reaction method. The synthesized nano crystalline solid solutions have cubic fluorite structure as evident from XRD patterns. The materials are qualitatively analyzed by FTIR. The morphology, size and shape of grains etc. are identified from the SEM images. The grain size of GDC is smaller than that of SDC. The better morphology is obtained for GDC. Hence, this is electrically characterized. The activation energy is calculated from the slope of Arrhenius plot (showing variation of conductivity with temperature).","PeriodicalId":443383,"journal":{"name":"Electrochemical Energy Technology","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116330862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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