The Experts below are selected from a list of 153 Experts worldwide ranked by ideXlab platform
Pedro Gómez-romero - One of the best experts on this subject based on the ideXlab platform.
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A high voltage solid state symmetric supercapacitor based on graphene–polyoxometalate hybrid electrodes with a hydroquinone doped hybrid gel-Electrolyte
Journal of Materials Chemistry A, 2015Co-Authors: Deepak P. Dubal, Jullieth Suárez-guevara, Dino Tonti, Eduardo Enciso, Pedro Gómez-romeroAbstract:In pursuit of high capacitance and high energy density storage devices, hybrid materials have quickly garnered well-deserved attention based on their power to merge complementary components and properties. Here, we report the fabrication of all-solid state symmetric supercapacitors (ASSSC) based on a double hybrid approach combining a hybrid electrode (reduced graphene oxide-phoshomolybdate, rGO-PMo12) and a hybrid Electrolyte (hydroquinone doped gel-Electrolyte). To begin with, a high-performance hybrid electrode based on H3PMo12O40 nanodots anchored onto rGO was prepared (rGO-PMo12). Later, an all-solid state symmetric cell based on these rGO-PMo12 electrodes, and making use of a polymer gel-Electrolyte was assembled. This symmetric cell showed a significant improvement in cell performance. Indeed, it allowed for an extended potential window by 0.3 V that led to an energy density of 1.07 mW h cm-3. Finally, we combined these hybrid electrodes with a hybrid Electrolyte incorporating an electroactive species. This is the first proof-of-design where a redox-active solid-state gel-Electrolyte is applied to rGO-PMo12 hybrid supercapacitors to accomplish a significant enhancement in the capacitance. Strikingly, a further excellent increase in the device performance (energy density of 1.7 mW h cm-3) was realized with the hybrid electrode-hybrid Electrolyte Combination cell as compared to that of the conventional Electrolyte cell. Thus, this unique symmetric device outclasses the high-voltage asymmetric counterparts under the same power and represents a noteworthy advance towards high energy density supercapacitors.
Ivana Hasa - One of the best experts on this subject based on the ideXlab platform.
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a sodium ion battery exploiting layered oxide cathode graphite anode and glyme based Electrolyte
Journal of Power Sources, 2016Co-Authors: Ivana Hasa, Xinwei Dou, Jusef Hassoun, Yang Shaohorn, Stefano Passerini, Daniel Buchholz, Bruno ScrosatiAbstract:Room-temperature rechargeable sodium-ion batteries (SIBs), in view of the large availability and low cost of sodium raw materials, represent an important class of electrochemical systems suitable for application in large-scale energy storage. In this work, we report a novel, high power SIB formed by coupling the layered P2-Na0.7CoO2 cathode with the graphite anode in an optimized ether-based Electrolyte. The study firstly addresses the electrochemical optimization of the two electrode materials and then the realization and characterization of the novel SIB based on their Combination. The cell represents an original sodium rocking chair battery obtained combining the intercalation/de-intercalation processes of sodium within the cathode and anode layers. We show herein that this battery, favored by suitable electrode/Electrolyte Combination, offers unique performance in terms of cycle life, efficiency and, especially, power capability.
Ryoji Kanno - One of the best experts on this subject based on the ideXlab platform.
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Interfacial reactions at electrode/Electrolyte boundary in all solid-state lithium battery using inorganic solid Electrolyte, thio-LISICON
Electrochimica Acta, 2008Co-Authors: Takeshi Kobayashi, Atsuo Yamada, Ryoji KannoAbstract:Abstract Electrode/Electrolyte interface was studied for all solid-state batteries using inorganic solid Electrolyte with the crystalline thio-LISICON and glassy Li–Si–P–S–O systems. The formation of the interfacial phase depends on the Electrolyte. The thio-LISICON (Li3.25Ge0.25P0.75S4) and the Li–Al negative electrode provided the best electrode/Electrolyte interface for fast charge–discharge characteristics, while the SEI phase formed at the Li–Al/Li3PO4–Li2S–SiS2 glass boundary caused high interfacial resistance. The formation of the SEI phase is general behavior at the electrode/Electrolyte interface of solid-state batteries, and the fast electrochemical reaction is attained as a result of optimization of the electrode/Electrolyte Combination.
Jagath C. Pitawela - One of the best experts on this subject based on the ideXlab platform.
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Fabrication and evaluation of an electrochemical double-layer capacitor with natural graphite electrodes and magnesium trifluoromethanesulfonate–based gel polymer Electrolyte
Journal of Solid State Electrochemistry, 2019Co-Authors: K. A. Janani K. Karunarathne, K. S. Perera, K. P. Vidanapathirana, Jagath C. PitawelaAbstract:Super capacitors have emerged as a promising substitute for batteries and conventional capacitors which have played a key role as energy storage devices. The continuous concerns over green and low-cost concepts have motivated the consideration of natural materials as they are non-toxic and low cost. On the other hand, the realization of the dangers of liquid Electrolytes has promoted the attention on gel polymer Electrolytes to be used for devices. The prime objective of the present study is fabricating an electrochemical double-layer capacitor (EDLC) which is a type of super capacitor make using natural graphite and a gel polymer Electrolyte. The Electrolyte having the composition 0.5 PVdF-Co-HFP:0.70 MgTF:1 EC:1 DEC showed an optimum room temperature conductivity of 3.45 × 10^−3 S cm^−1. It was purely an ionic conductor having improved amorphous nature. EDLCs were fabricated with two identical natural graphite electrodes. Evaluation of EDLC was carried out using cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge-discharge test. The proposed electrode/Electrolyte Combination seemed to be suitable for the application in EDLCs. Specific capacitance values obtained are satisfactory to carry forward further investigations to improve performance.
Deepak P. Dubal - One of the best experts on this subject based on the ideXlab platform.
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A high voltage solid state symmetric supercapacitor based on graphene–polyoxometalate hybrid electrodes with a hydroquinone doped hybrid gel-Electrolyte
Journal of Materials Chemistry A, 2015Co-Authors: Deepak P. Dubal, Jullieth Suárez-guevara, Dino Tonti, Eduardo Enciso, Pedro Gómez-romeroAbstract:In pursuit of high capacitance and high energy density storage devices, hybrid materials have quickly garnered well-deserved attention based on their power to merge complementary components and properties. Here, we report the fabrication of all-solid state symmetric supercapacitors (ASSSC) based on a double hybrid approach combining a hybrid electrode (reduced graphene oxide-phoshomolybdate, rGO-PMo12) and a hybrid Electrolyte (hydroquinone doped gel-Electrolyte). To begin with, a high-performance hybrid electrode based on H3PMo12O40 nanodots anchored onto rGO was prepared (rGO-PMo12). Later, an all-solid state symmetric cell based on these rGO-PMo12 electrodes, and making use of a polymer gel-Electrolyte was assembled. This symmetric cell showed a significant improvement in cell performance. Indeed, it allowed for an extended potential window by 0.3 V that led to an energy density of 1.07 mW h cm-3. Finally, we combined these hybrid electrodes with a hybrid Electrolyte incorporating an electroactive species. This is the first proof-of-design where a redox-active solid-state gel-Electrolyte is applied to rGO-PMo12 hybrid supercapacitors to accomplish a significant enhancement in the capacitance. Strikingly, a further excellent increase in the device performance (energy density of 1.7 mW h cm-3) was realized with the hybrid electrode-hybrid Electrolyte Combination cell as compared to that of the conventional Electrolyte cell. Thus, this unique symmetric device outclasses the high-voltage asymmetric counterparts under the same power and represents a noteworthy advance towards high energy density supercapacitors.