The Experts below are selected from a list of 93933 Experts worldwide ranked by ideXlab platform
F C Walsh - One of the best experts on this subject based on the ideXlab platform.
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reticulated vitreous carbon as an Electrode Material
Journal of Electroanalytical Chemistry, 2004Co-Authors: Jens M Friedrich, C Poncedeleon, Gavin W Reade, F C WalshAbstract:An illustrated review of reticulated vitreous carbon (RVC) as an Electrode Material is presented. Early uses of RVC were largely restricted to small-scale (<1 cm3) electroanalytical studies in research laboratories. RVC properties of a high ratio of surface area to volume and minimal reactivity over a wide range of process conditions, combined with low cost and easy handling, have resulted in a steady diversification of its applications both in research laboratories and in industry. The physical structure of RVC (in terms of pores per linear inch, strut length, strut thickness and area of the trigonal strut) is examined for 10, 30, 60 and 100 ppi (pores per linear inch) grades using scanning electron microscopy. The accurate measurement of these geometrical values presents both theoretical (in terms of definition of trigonal strut area, beginning and end of single strand) and practical problems (large differences in strut length and thickness in individual samples). Data are presented to show the relationships between geometrical properties. Applications include electroanalytical studies and sensors, metal ion removal, synthesis of organics and Fenton s reagent, H2O2 production and batteries/fuel cells.
Shan Lin Zhang - One of the best experts on this subject based on the ideXlab platform.
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cobalt substituted srti0 3fe0 7o3 δ a stable high performance oxygen Electrode Material for intermediate temperature solid oxide electrochemical cells
Energy and Environmental Science, 2018Co-Authors: Shan Lin Zhang, Hongqian Wang, Ai Ping Zhang, Liliana Veronica Mogni, Qinyuan Liu, Scott A BarnettAbstract:A key need in the development of solid oxide cells (SOCs) is for Electrodes that promote fast oxygen reduction and oxygen evolution reactions at reduced operating temperature (≤700 °C), with sufficient durability to allow operation over desired 40 000 h lifetimes. A wide range of Electrode Materials have been investigated, with some providing resistance low enough for cell operation below 700 °C, but it is generally found that the Electrode performance degrades over time. Here we demonstrate an oxygen Electrode Material, Sr(Ti0.3Fe0.7−xCox)O3−δ (STFC), that provides a unique combination of excellent oxygen Electrode performance and long-term stability. The addition of a relatively small amount of Co to Sr(Ti0.3Fe0.7)O3−δ, e.g., x = 0.07, reduces the Electrode polarization resistance by >2 times. The STFC Electrode yields stable performance in both fuel cell and electrolysis modes at 1 A cm−2. The fundamental oxygen diffusion and surface exchange coefficients of STFC are determined, and shown to be substantially better than those of La0.6Sr0.4Co0.2Fe0.8O3−δ, the most widely used SOC oxygen Electrode Material. While other Electrode Materials have been shown to exhibit better oxygen transport coefficients than STFC, they do not match its stability.
Jeffrey A Reimer - One of the best experts on this subject based on the ideXlab platform.
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magnesium silicide as a negative Electrode Material for lithium ion batteries
Journal of Power Sources, 2002Co-Authors: G A Roberts, Elton J Cairns, Jeffrey A ReimerAbstract:Abstract Mg 2 Si was synthesized by mechanically activated annealing and evaluated as a negative Electrode Material. A maximum discharge capacity of 830 mAh/g was observed by cycling over a wide voltage window of 5–650 mV versus Li, but capacity fade was rapid. Cycling over the range 50–225 mV versus Li produced a stable discharge capacity of approximately 100 mAh/g. X-ray diffraction (XRD) experiments showed that lithium insertion converts Mg 2 Si into Li 2 MgSi after lithium intercalation into Mg 2 Si. Electrochemical evidence of Li–Si reactions indicated that the Li 2 MgSi structure can be converted to binary lithium alloys with extensive charging.
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magnesium silicide as a negative Electrode Material for lithium ion batteries
Journal of Power Sources, 2002Co-Authors: G A Roberts, Elton J Cairns, Jeffrey A ReimerAbstract:Abstract Mg 2 Si was synthesized by mechanically activated annealing and evaluated as a negative Electrode Material. A maximum discharge capacity of 830 mAh/g was observed by cycling over a wide voltage window of 5–650 mV versus Li, but capacity fade was rapid. Cycling over the range 50–225 mV versus Li produced a stable discharge capacity of approximately 100 mAh/g. X-ray diffraction (XRD) experiments showed that lithium insertion converts Mg 2 Si into Li 2 MgSi after lithium intercalation into Mg 2 Si. Electrochemical evidence of Li–Si reactions indicated that the Li 2 MgSi structure can be converted to binary lithium alloys with extensive charging.
Chingping Wong - One of the best experts on this subject based on the ideXlab platform.
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evaluating biomass derived hierarchically porous carbon as the positive Electrode Material for hybrid na ion capacitors
Journal of Power Sources, 2017Co-Authors: Jizhang Chen, Xiaoyan Zhou, Changtong Mei, Shuang Zhou, Chingping WongAbstract:Abstract As a promising renewable resource, biomass has several advantages such as wide availability, low cost, and versatility. In this study, we use peanut shell, wheat straw, rice straw, corn stalk, cotton stalk, and soybean stalk as the precursors to synthesize hierarchically porous carbon as the positive Electrode Material for hybrid Na-ion capacitors, aiming to establish a criterion of choosing suitable biomass precursors. The carbon derived from wood-like cotton stalk has abundant interconnected macropores, high surface area of 1994 m2 g−1, and large pore volume of 1.107 cm3 g−1, thanks to which it exhibits high reversible capacitance of 160.5 F g−1 at 0.2 A g−1 and great rate capability, along with excellent cyclability. The carbonaceous positive Electrode Material is combined with a Na2Ti2.97Nb0.03O7 negative Electrode Material to assemble a hybrid Na-ion capacitor, which delivers a high specific energy of 169.4 Wh kg−1 at 120.5 W kg−1, ranking among the best-performed hybrid ion capacitors.
Tetsu Kiyobayashi - One of the best experts on this subject based on the ideXlab platform.
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indigo carmine an organic crystal as a positive Electrode Material for rechargeable sodium batteries
Scientific Reports, 2015Co-Authors: Kentaro Kuratani, Toshikatsu Kojima, Nobuhiko Takeichi, Hiroshi Senoh, Tetsu KiyobayashiAbstract:Using sodium, instead of lithium, in rechargeable batteries is a way to circumvent the lithium's resource problem. The challenge is to find an Electrode Material that can reversibly undergo redox reactions in a sodium-electrolyte at the desired electrochemical potential. We proved that indigo carmine (IC, 5,5′-indigodisulfonic acid sodium salt) can work as a positive-Electrode Material in not only a lithium-, but also a sodium-electrolyte. The discharge capacity of the IC-Electrode was ~100 mAh g−1 with a good cycle stability in either the Na or Li electrolyte, in which the average voltage was 1.8 V vs. Na+/Na and 2.2 V vs. Li+/Li, respectively. Two Na ions per IC are stored in the Electrode during the discharge, testifying to the two-electron redox reaction. An X-ray diffraction analysis revealed a layer structure for the IC powder and the DFT calculation suggested the formation of a band-like structure in the crystal.