The Experts below are selected from a list of 7563 Experts worldwide ranked by ideXlab platform
Shengping Guo - One of the best experts on this subject based on the ideXlab platform.
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effective combination of fes2 microspheres and fe3s4 microcubes with rgo as anode material for high capacity and long cycle lithium ion batteries
Journal of Power Sources, 2018Co-Authors: Huaiguo Xue, Shengping GuoAbstract:Abstract Iron Sulfides receive special interests as anode materials for lithium or sodium ion batteries in view of their low-cost, envIronmental benign, and high conductivities. Here, a combination of FeS2 microspheres and Fe3S4 microcubes with reduced graphene oxides (Iron Sulfides@rGO) is prepared by a facile in-situ hydrothermal method. As an anode material for lithium ion batteries, Iron Sulfides@rGO exhibits excellent lithium storage ability. It delivers a high initial discharge capacity of 1476.2 mA h/g at 100 mA/g, and 1189.6 mA h/g capacity can be maintained after 100 cycles. Most impressively, 800 mA h/g capacity can be remained after 1000 cycles even at 1 A/g.
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binary Iron Sulfides as anode materials for rechargeable batteries crystal structures syntheses and electrochemical performance
Journal of Power Sources, 2018Co-Authors: Huaiguo Xue, Shengping GuoAbstract:Abstract Effective utilization of energy requires the storage and conversion device with high ability. For well-developed lithium ion batteries (LIBs) and highly developing sodium ion batteries (SIBs), this ability especially denotes to high energy and power densities. It's believed that the capacity of a full cell is mainly contributed by anode materials. So, to develop inexpensive anode materials with high capacity are meaningful for various rechargeable batteries' better applications. Iron is a productive element in the crust, and its oxides, Sulfides, fluorides, and oxygen acid salts are extensively investigated as electrode materials for batteries. In view of the importance of electrode materials containing Iron, this review summarizes the recent achievements on various binary Iron Sulfides (FeS, FeS2, Fe3S4, and Fe7S8)-type electrodes for batteries. The contents are mainly focused on their crystal structures, synthetic methods, and electrochemical performance. Moreover, the challenges and some improvement strategies are also discussed.
David A Fike - One of the best experts on this subject based on the ideXlab platform.
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sulfur isotope analysis of microcrystalline Iron Sulfides using secondary ion mass spectrometry imaging extracting local paleo envIronmental information from modern and ancient sediments
Rapid Communications in Mass Spectrometry, 2019Co-Authors: Roger N Bryant, Clive Jones, M R Raven, M L Gomes, William M Berelson, Alexander S Bradley, David A FikeAbstract:Author(s): Bryant, Roger N; Jones, Clive; Raven, Morgan R; Gomes, Maya L; Berelson, William M; Bradley, Alexander S; Fike, David A | Abstract: RATIONALE:Sulfur isotope ratio measurements of bulk sulfide from marine sediments have often been used to reconstruct envIronmental conditions associated with their formation. In situ microscale spot analyses by secondary ion mass spectrometry (SIMS) and laser ablation multiple-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) have been utilized for the same purpose. However, these techniques are often not suitable for studying small (≤10 μm) grains or for detecting intra-grain variability. METHODS:Here, we present a method for the physical extraction (using lithium polytungstate heavy liquid) and subsequent sulfur isotope analysis (using SIMS; CAMECA IMS 7f-GEO) of microcrystalline Iron Sulfides. SIMS sulfur isotope ratio measurements were made via Cs+ bombardment of raster squares with sides of 20-130 μm, using an electron multiplier (EM) detector to collect counts of 32 S- and 34 S- for each pixel (128 × 128 pixel grids) for between 20 and 960 cycles. RESULTS:The extraction procedure did not discernibly alter pyrite grain-size distributions. The apparent inter-grain variability in 34 S/32 S in 1-4 μm-sized pyrite and marcasite fragments from isotopically homogeneous hydrothermal crystals was ~ ±2‰ (1σ), comparable with the standard error of the mean for individual measurements (≤ ±2‰, 1σ). In contrast, grain-specific 34 S/32 S ratios in modern and ancient sedimentary pyrites and marcasites can have inter- and intra-grain variability g60‰. The distributions of intra-sample isotopic variability are consistent with bulk 34 S/32 S values. CONCLUSIONS:SIMS analyses of isolated Iron sulfide grains yielded distributions that are isotopically representative of bulk 34 S/32 S values. Populations of Iron sulfide grains from sedimentary samples record the evolution of the S-isotopic composition of pore water sulfide in their S-isotopic compositions. These data allow past local envIronmental conditions to be inferred.
M R Raven - One of the best experts on this subject based on the ideXlab platform.
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sulfur isotope analysis of microcrystalline Iron Sulfides using secondary ion mass spectrometry imaging extracting local paleo envIronmental information from modern and ancient sediments
Rapid Communications in Mass Spectrometry, 2019Co-Authors: Roger N Bryant, Clive Jones, M R Raven, M L Gomes, William M Berelson, Alexander S Bradley, David A FikeAbstract:Author(s): Bryant, Roger N; Jones, Clive; Raven, Morgan R; Gomes, Maya L; Berelson, William M; Bradley, Alexander S; Fike, David A | Abstract: RATIONALE:Sulfur isotope ratio measurements of bulk sulfide from marine sediments have often been used to reconstruct envIronmental conditions associated with their formation. In situ microscale spot analyses by secondary ion mass spectrometry (SIMS) and laser ablation multiple-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) have been utilized for the same purpose. However, these techniques are often not suitable for studying small (≤10 μm) grains or for detecting intra-grain variability. METHODS:Here, we present a method for the physical extraction (using lithium polytungstate heavy liquid) and subsequent sulfur isotope analysis (using SIMS; CAMECA IMS 7f-GEO) of microcrystalline Iron Sulfides. SIMS sulfur isotope ratio measurements were made via Cs+ bombardment of raster squares with sides of 20-130 μm, using an electron multiplier (EM) detector to collect counts of 32 S- and 34 S- for each pixel (128 × 128 pixel grids) for between 20 and 960 cycles. RESULTS:The extraction procedure did not discernibly alter pyrite grain-size distributions. The apparent inter-grain variability in 34 S/32 S in 1-4 μm-sized pyrite and marcasite fragments from isotopically homogeneous hydrothermal crystals was ~ ±2‰ (1σ), comparable with the standard error of the mean for individual measurements (≤ ±2‰, 1σ). In contrast, grain-specific 34 S/32 S ratios in modern and ancient sedimentary pyrites and marcasites can have inter- and intra-grain variability g60‰. The distributions of intra-sample isotopic variability are consistent with bulk 34 S/32 S values. CONCLUSIONS:SIMS analyses of isolated Iron sulfide grains yielded distributions that are isotopically representative of bulk 34 S/32 S values. Populations of Iron sulfide grains from sedimentary samples record the evolution of the S-isotopic composition of pore water sulfide in their S-isotopic compositions. These data allow past local envIronmental conditions to be inferred.
Huaiguo Xue - One of the best experts on this subject based on the ideXlab platform.
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effective combination of fes2 microspheres and fe3s4 microcubes with rgo as anode material for high capacity and long cycle lithium ion batteries
Journal of Power Sources, 2018Co-Authors: Huaiguo Xue, Shengping GuoAbstract:Abstract Iron Sulfides receive special interests as anode materials for lithium or sodium ion batteries in view of their low-cost, envIronmental benign, and high conductivities. Here, a combination of FeS2 microspheres and Fe3S4 microcubes with reduced graphene oxides (Iron Sulfides@rGO) is prepared by a facile in-situ hydrothermal method. As an anode material for lithium ion batteries, Iron Sulfides@rGO exhibits excellent lithium storage ability. It delivers a high initial discharge capacity of 1476.2 mA h/g at 100 mA/g, and 1189.6 mA h/g capacity can be maintained after 100 cycles. Most impressively, 800 mA h/g capacity can be remained after 1000 cycles even at 1 A/g.
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binary Iron Sulfides as anode materials for rechargeable batteries crystal structures syntheses and electrochemical performance
Journal of Power Sources, 2018Co-Authors: Huaiguo Xue, Shengping GuoAbstract:Abstract Effective utilization of energy requires the storage and conversion device with high ability. For well-developed lithium ion batteries (LIBs) and highly developing sodium ion batteries (SIBs), this ability especially denotes to high energy and power densities. It's believed that the capacity of a full cell is mainly contributed by anode materials. So, to develop inexpensive anode materials with high capacity are meaningful for various rechargeable batteries' better applications. Iron is a productive element in the crust, and its oxides, Sulfides, fluorides, and oxygen acid salts are extensively investigated as electrode materials for batteries. In view of the importance of electrode materials containing Iron, this review summarizes the recent achievements on various binary Iron Sulfides (FeS, FeS2, Fe3S4, and Fe7S8)-type electrodes for batteries. The contents are mainly focused on their crystal structures, synthetic methods, and electrochemical performance. Moreover, the challenges and some improvement strategies are also discussed.
Roger N Bryant - One of the best experts on this subject based on the ideXlab platform.
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sulfur isotope analysis of microcrystalline Iron Sulfides using secondary ion mass spectrometry imaging extracting local paleo envIronmental information from modern and ancient sediments
Rapid Communications in Mass Spectrometry, 2019Co-Authors: Roger N Bryant, Clive Jones, M R Raven, M L Gomes, William M Berelson, Alexander S Bradley, David A FikeAbstract:Author(s): Bryant, Roger N; Jones, Clive; Raven, Morgan R; Gomes, Maya L; Berelson, William M; Bradley, Alexander S; Fike, David A | Abstract: RATIONALE:Sulfur isotope ratio measurements of bulk sulfide from marine sediments have often been used to reconstruct envIronmental conditions associated with their formation. In situ microscale spot analyses by secondary ion mass spectrometry (SIMS) and laser ablation multiple-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) have been utilized for the same purpose. However, these techniques are often not suitable for studying small (≤10 μm) grains or for detecting intra-grain variability. METHODS:Here, we present a method for the physical extraction (using lithium polytungstate heavy liquid) and subsequent sulfur isotope analysis (using SIMS; CAMECA IMS 7f-GEO) of microcrystalline Iron Sulfides. SIMS sulfur isotope ratio measurements were made via Cs+ bombardment of raster squares with sides of 20-130 μm, using an electron multiplier (EM) detector to collect counts of 32 S- and 34 S- for each pixel (128 × 128 pixel grids) for between 20 and 960 cycles. RESULTS:The extraction procedure did not discernibly alter pyrite grain-size distributions. The apparent inter-grain variability in 34 S/32 S in 1-4 μm-sized pyrite and marcasite fragments from isotopically homogeneous hydrothermal crystals was ~ ±2‰ (1σ), comparable with the standard error of the mean for individual measurements (≤ ±2‰, 1σ). In contrast, grain-specific 34 S/32 S ratios in modern and ancient sedimentary pyrites and marcasites can have inter- and intra-grain variability g60‰. The distributions of intra-sample isotopic variability are consistent with bulk 34 S/32 S values. CONCLUSIONS:SIMS analyses of isolated Iron sulfide grains yielded distributions that are isotopically representative of bulk 34 S/32 S values. Populations of Iron sulfide grains from sedimentary samples record the evolution of the S-isotopic composition of pore water sulfide in their S-isotopic compositions. These data allow past local envIronmental conditions to be inferred.
