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Self-discharge in supercapacitors: Causes, effects and therapies: An overview 超级电容器的自放电:原因、影响和治疗综述
Pub Date : 2021-01-01 DOI: 10.1515/eetech-2020-0100
Yuping Wu, R. Holze
Abstract Self-discharge as an omnipresent and unwelcome feature of electrochemical storage devices driven by fundamental forces is briefly introduced and put into perspective. Causes and observed effects as well as possible consequences and modifications in support of a therapy of these effects are described. Care is taken to consider observed phenomena with respect to different types of supercapacitors and different classes of electrode materials and additives inside a cell. Modeling and further theoretical approaches are presented. Recommendations for reporting and data presentation are provided.
摘要本文简要介绍了自放电这一电化学存储装置中普遍存在的、不受欢迎的基本力驱动特性。原因和观察到的影响,以及可能的后果和修改,以支持治疗这些影响的描述。注意考虑不同类型的超级电容器和电池内不同类别的电极材料和添加剂所观察到的现象。提出了建模和进一步的理论方法。对报告和数据展示提出了建议。
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引用次数: 19
Concentration-dependent corrosion inhibition with electrochemical energy conversion systems by a disubstituted aromatic: A comparison of methods 双取代芳香族电化学能量转换系统的浓度依赖性缓蚀:方法比较
Pub Date : 2021-01-01 DOI: 10.1515/eetech-2020-0101
Jessica Roscher, Dan Liu, R. Holze
Abstract The suitability of three electrochemical methods commonly used for the assessment of efficiency of corrosion inhibitors in practical applications has been examined by a direct comparison of relevant results with an aromatic corrosion inhibitor as example. Discrepancies between results are discussed, practical approaches taking inherent weaknesses of the methods are indicated.
摘要以芳香族缓蚀剂为例,对常用的三种电化学方法在实际应用中评价缓蚀剂效率的适用性进行了考察。讨论了结果之间的差异,指出了克服方法固有缺陷的实用方法。
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引用次数: 0
1D Hematite-[α-Fe2O3]-nanorods prepared by green fabrication for supercapacitor electrodes 绿色制备超级电容器电极用1D赤铁矿-[α-Fe2O3]纳米棒
Pub Date : 2019-01-01 DOI: 10.1515/eetech-2019-0001
Yu Ge, Md. Ikram Ul Hoque, Q. Qu
Abstract 1D α-hematite nanorods synthesized by a simple, scalable and novel green chemistry method exhibit fast kinetics of the interfacial Faradaic redox reaction yielding a specific capacitance of 140 F·g−1 when used as a battery-type electrode in a supercapacitor. Ample supply and environmental compatibility of the raw material suggest the use of this material. Insufficient stability suggest further investigations.
摘要采用一种简单、可扩展、新颖的绿色化学方法合成的一维α-赤铁矿纳米棒,在超级电容器中具有快速的界面法拉第氧化还原反应动力学,比电容可达140 F·g−1。充足的供应和环境相容性的原材料建议使用这种材料。稳定性不足表明需要进一步调查。
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引用次数: 9
Effect of magnesium sulfate on the electrochemical behavior of lead electrodes for lead acid batteries 硫酸镁对铅酸电池铅电极电化学行为的影响
Pub Date : 2018-12-01 DOI: 10.1515/eetech-2018-0007
M. Venkateswarlu, T. Balusamy, K. Murthy, M. Jagadish, S. Vijayanand
Abstract The lead acid battery technology has undergone several modifications in the recent past, in particular, the electrode grid composition, oxide paste recipe with incorporation of foreign additives into the electrodes and similarly additives added in the electrolytes to improve electrical performance of the lead acid battery. In this paper, the electrochemical behavior of the lead electrodes with different weight/volume percentages (wt./v%) of MgSO4(0.0., 0.5., 1.0., 2.0., and 5.0) added into the electrolyte have been investigated with cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS). The CV profile showed better redox behavior of the lead electrodes which was attributed to the increased active surface area of the electrode. Further studies of the gas evolution found a mixed trend and a considerable drop in the impedance as observed by LSV and EIS analysis as compared to the blank electrolyte solution. The influence of a modified electrolyte on the electrochemical activity of the lead electrodes is correlated and discussed.
摘要近年来,铅酸电池技术经历了几次改进,特别是电极栅格组成、在电极中加入外来添加剂的氧化物膏配方以及在电解质中添加类似添加剂以提高铅酸电池的电性能。本文研究了不同重量/体积百分比(wt./v%)的MgSO4(0.0。0.5点。1.0点。2.0点。采用循环伏安法(CV)、线性扫描伏安法(LSV)和电化学阻抗谱法(EIS)对添加到电解液中的溶液进行了表征。CV曲线表明铅电极的氧化还原性能较好,这是由于电极的活性表面积增加所致。进一步的气体演化研究发现,与空白电解质溶液相比,LSV和EIS分析观察到的阻抗有相当大的下降。讨论了改性电解质对铅电极电化学活性的影响。
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引用次数: 4
A three-dimensional conducting network of rGO-in-graphite-felt as electrode for vanadium redox flow batteries 石墨毡中氧化石墨烯三维导电网络作为钒氧化还原液流电池的电极
Pub Date : 2018-12-01 DOI: 10.1515/eetech-2018-0008
Hongrui Wang, Wei Ling, Jizhong Chen, Zhian Wang, Xian‐Xiang Zeng, Yongqing Hu, Xiongwei Wu, Qi Deng, Guanghui Chen, Yuping Wu, R. Holze
Abstract Graphite felt (GF) with numerous merits has been widely used as electrode in all-vanadium redox flow batteries (VRFB), but its further application is still hindered by its intrinsically poor electrocatalytic activity. Herein, we propose a three-dimensional (3D) conducting network constructed with reduced graphene oxide (rGO) in the GF electrode via a two-step method. The 3D conducting network with abundant oxygen-containing functional groups in the GF is conducive to the transport of electrons between GF fibers and the electrochemical charge transfer to vanadium ions in the composite electrode; it can enhance the electrocatalytic activity and conductivity of GF. The VRFB using 3D rGO modified GF (mGF) electrode exhibited outstanding energy efficiency of 73.4% at a current density of 100 mA·cm−2, which is much higher than that with pristine GF (pGF) (65.4%); and better rate capability. These first results reveal that GF with 3D conducting network shows promising opportunities for the VRFB and other electrochemical flow systems
石墨毡(GF)具有许多优点,被广泛用于全钒氧化还原液流电池(VRFB)的电极,但其固有的电催化活性较差,阻碍了其进一步的应用。在此,我们提出了一个三维(3D)导电网络,通过两步法在GF电极中还原氧化石墨烯(rGO)构建。GF中含有丰富含氧官能团的三维导电网络有利于GF纤维之间的电子传递和电化学电荷向复合电极中的钒离子转移;它能提高GF的电催化活性和电导率。在100 mA·cm−2的电流密度下,采用3D rGO修饰的GF (mGF)电极制备的VRFB的能量效率为73.4%,远高于原始GF (pGF)的65.4%;以及更好的速率能力。这些初步结果表明,具有3D导电网络的GF在VRFB和其他电化学流动系统中具有广阔的应用前景
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引用次数: 3
Nano-TiO2 Phosphate Conversion Coatings – A Chemical Approach 纳米二氧化钛磷酸盐转化涂层-化学方法
Pub Date : 2018-07-11 DOI: 10.1515/eetech-2018-0006
N. S. Bagal, V. S. Kathavate, P. Deshpande
Abstract The present study aims at deposition of zinc phosphate coatings on low carbon steel with incorporated nano- TiO2 particles by chemical phosphating method. The coated low carbon steel samples were assessed in corrosion studies using electrochemical impedance spectroscopy and potentiodynamic polarization techniques (Tafel) in 3.5% NaCl solution. Morphology and chemical composition of the coatings were analyzed by scanning electron microscopy and energy dispersive X-ray spectroscopy in order to observe growth of coating. Significant variations in the coating weight, porosity and corrosion resistance were observed with the addition of nano- TiO2 in the phosphating bath. Corrosion rate of nano-TiO2 chemical phosphate coated samples was found to be 3.5 milli inches per year which was 3 times less than the normal phosphate-coated sample (8 mpy). Electrochemical impedance spectroscopy studies reveal reduction of porosity of nano-TiO2 phosphate coated samples. It was found that nano-TiO2 particles in the phosphating solution yielded uniform phosphate coatings of higher coating weight, fewer defects and enhanced corrosion resistance than the normal zinc phosphate coatings (developed using normal phosphating bath).
摘要采用化学磷化法在低碳钢表面沉积纳米TiO2颗粒的磷酸锌涂层。采用电化学阻抗谱和动电位极化技术(Tafel)对涂层低碳钢样品在3.5% NaCl溶液中的腐蚀进行了研究。利用扫描电镜和x射线能谱分析了涂层的形貌和化学成分,观察了涂层的生长情况。在磷化液中加入纳米TiO2后,涂层的重量、孔隙率和耐腐蚀性都发生了显著变化。发现纳米二氧化钛化学磷酸盐包覆样品的腐蚀速率为每年3.5毫米英寸,比普通磷酸盐包覆样品(8英里/年)小3倍。电化学阻抗谱研究表明,纳米二氧化钛磷酸盐包被样品的孔隙率降低。结果表明,纳米tio2颗粒在磷化液中生成的磷化膜比普通磷化液制备的磷化锌膜具有更高的镀层重量、更少的缺陷和更强的耐腐蚀性。
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引用次数: 6
Partially Fluorinated Ether as an Electrolyte Additive to Modify Electrode Surface and Suppress Dissolution of Polysulfides in Li-S Batteries 部分氟化醚作为电解质添加剂修饰锂硫电池电极表面和抑制多硫化物溶解
Pub Date : 2018-07-11 DOI: 10.1515/eetech-2018-0005
Feng Qian, Jie Shao, Yu Chen, Guobin Zhu, Q. Qu, Honghe Zheng
Abstract 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE), a kind of fluorinated ether, was used as an electrolyte additive for Li-S batteries. A compact, smooth, and homogenous surface layer was formed on lithium anode at the optimized amount of added TTE. In addition, TTE additive played a crucial role in modifying the composition of the passivation layer on the sulfur/carbon cathode. Consequently, the dissolution and shuttling of polysulfides were effectively prevented. The reversible capacity, initial coulombic efficiency, electrode reaction kinetic, and cycling stability of Li-S batteries were greatly improved.
摘要:将1,1,2,2,2 -四氟乙基-2,2,3,3-四氟丙基醚(TTE)作为锂硫电池的电解质添加剂。在最佳TTE添加量下,在锂阳极表面形成致密、光滑、均匀的表面层。此外,TTE添加剂对硫碳阴极钝化层的组成起着至关重要的作用。从而有效地防止了多硫化物的溶解和穿梭。大大提高了锂硫电池的可逆容量、初始库仑效率、电极反应动力学和循环稳定性。
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引用次数: 8
SnO2/PANI nanocomposite electrodes for supercapacitors and lithium ion batteries 超级电容器和锂离子电池用SnO2/PANI纳米复合电极
Pub Date : 2018-06-15 DOI: 10.1515/eetech-2018-0004
V. S. Channu, B. Rambabu, K. Kumari, Rajmohan R. Kalluru, R. Holze
Abstract Tin oxide (SnO2) nanostructures and SnO2/Polyaniline (PANI) nanocomposites to be used as electrode materials for a lithium ion battery were synthesized using a solution-route technique with chelating agents followed by calcination at 300∘C for 4 h. Structural and morphological properties were studied with powder X-ray diffraction, scanning electron and transmission electron microscopy. Particles of 25-10 nm size are observed in the microscope images. TGA results showed that the PANI-modified SnO2 nanoparticles exhibit higher thermal stability than the SnO2 nanoparticles. Electrochemical properties of SnO2 and SnO2/PANI electrodes were examined in a lithium ion battery and a supercapacitor. The electrode of SnO2/PANI shows higher specific capacity. The cell with SnO2/PANI exhibits a specific capacity of 1450 mAh/g at C/10. Supercapacitor results indicate that the PANI-modified SnO2 composite had a higher current with apparent cathodic and anodic peaks.
摘要:采用溶液路线技术,在300°C的温度下,加入螯合剂,煅烧4 h,合成了用于锂离子电池电极材料的氧化锡(SnO2)纳米结构和SnO2/聚苯胺(PANI)纳米复合材料。采用粉末x射线衍射、扫描电子和透射电子显微镜对其结构和形貌进行了研究。在显微镜图像中观察到25-10纳米大小的颗粒。TGA结果表明,聚苯胺修饰的SnO2纳米颗粒比SnO2纳米颗粒具有更高的热稳定性。研究了SnO2和SnO2/PANI电极在锂离子电池和超级电容器中的电化学性能。SnO2/PANI电极具有较高的比容量。含SnO2/PANI的电池在C/10时的比容量为1450 mAh/g。超级电容结果表明,聚苯胺改性的SnO2复合材料具有较高的电流和明显的阴极和阳极峰。
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引用次数: 9
Carbon supported g-C3N4 for electrochemical sensing of hydrazine 碳负载g-C3N4用于联氨的电化学传感
Pub Date : 2018-05-30 DOI: 10.1515/eetech-2018-0003
K. Ramanujam, T. Thirupathi
Abstract This study reports a synthesis of carbon supported graphitic carbon nitride (g-C3N4-KBC) obtained by pyrolysis of melamine with Ketjenblack 600JD carbon (KBC) at 550°C for 4 h in a N2 atmosphere. g-C3N4-KBC oxidizes hydrazine at an onset potential 0.145 V vs. SCE close to the thermodynamic standard potential of hydrazine (0.23 V vs. SHE). In comparison to the controls, KBC and g-C3N4, g-C3N4-KBC oxidizes hydrazine at lower overpotential.Most research has tended to focus on transition metal-based catalysts and few are of carbon material such as graphene nanoflakes, graphene oxide, and carbon nanotubes. A comparison in terms of sensitivity, detection range and stability reveals g-C3N4-KBC electrode’s superiority over other carbon material-based catalysts. To the best of our knowledge, the g-C3N4-KBC catalyst is not reported for sensing hydrazine in the literature.
摘要本研究报道了在氮气气氛下,以三聚氰胺为原料,用Ketjenblack 600JD碳(KBC)在550℃下热解4 h,合成碳负载型石墨氮化碳(g-C3N4-KBC)。g-C3N4-KBC氧化肼的起始电位为0.145 V,接近肼的热力学标准电位(0.23 V,相对于SHE)。与对照相比,KBC和g-C3N4, g-C3N4-KBC在较低的过电位下氧化肼。大多数研究都集中在过渡金属基催化剂上,很少有碳材料,如石墨烯纳米片、氧化石墨烯和碳纳米管。在灵敏度、检测范围和稳定性方面的比较表明,g-C3N4-KBC电极优于其他碳材料基催化剂。据我们所知,g-C3N4-KBC催化剂在文献中尚未报道能感应肼。
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引用次数: 7
Electrodeposition of Polymer Nanostructures using Three Diffuse Double Layers: Polymerization beyond the Liquid/Liquid Interfaces 三层扩散双层聚合物纳米结构的电沉积:液/液界面以外的聚合
Pub Date : 2018-04-28 DOI: 10.1515/eetech-2018-0002
V. Divya, M. Sangaranarayanan
Abstract Nanostructured conducting polymers have received immense attention during the past few decades on account of their phenomenal usefulness in diverse contexts, while the interface between two immiscible liquids is of great interest in chemical and biological applications. Here we propose a novel Electrode(solid)/Electrolyte(aqueous)/Electrolyte(organic) Interfacial assembly for the synthesis of polymeric nanostructures using a novel concept of three diffuse double layers. There exist remarkable differences between the morphologies of the polymers synthesized using the conventional electrode/electrolyte method and that of the new approach. In contrast to the commonly employed electrodeposition at liquid/liquid interfaces, these polymer modified electrodes can be directly employed in diverse applications such as sensors, supercapacitors etc.
摘要纳米结构导电聚合物在过去的几十年里因其在各种环境中的非凡用途而受到了极大的关注,而两种不混溶液体之间的界面在化学和生物领域的应用也引起了人们的极大兴趣。在这里,我们提出了一种新的电极(固体)/电解质(水)/电解质(有机)界面组装,用于合成聚合物纳米结构,使用了三层扩散双层的新概念。传统电极/电解质法合成的聚合物形貌与新方法合成的聚合物形貌存在显著差异。与通常采用的液/液界面电沉积不同,这些聚合物修饰电极可以直接用于传感器、超级电容器等各种应用。
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引用次数: 0
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Electrochemical Energy Technology
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