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https://www.readbyqxmd.com/read/30120632/few-layer-graphene-sheet-passivated-porous-silicon-toward-excellent-electrochemical-double-layer-supercapacitor-electrode
#1
Te-Hui Wu, Chih-Tse Chang, Chun-Chieh Wang, Shaikh Parwaiz, Chih-Chung Lai, Yu-Ze Chen, Shih-Yuan Lu, Yu-Lun Chueh
Few-layer graphene sheet-passivated porous silicon (PSi) as an outstanding electrochemical double-layer supercapacitor electrode was demonstrated. The PSi matrix was formed by electrochemical etching of a doped silicon wafer and was further surface-passivated with few-layer graphene sheets by a Ni-assisted chemical vapor deposition process where a wide range of porous PSi structures, including mesoporous, macroporous, and hybrid porous structures were created during the graphene growth as temperature increases...
August 17, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/30119005/two-dimensional-porous-co-ni-based-monometallic-hydroxides-and-bimetallic-layered-double-hydroxides-thin-sheets-with-honeycomb-like-nanostructure-as-positive-electrode-for-high-performance-hybrid-supercapacitors
#2
Biao Huang, Wensong Wang, Tao Pu, Jie Li, Jikui Zhu, Chenglan Zhao, Li Xie, Lingyun Chen
CoNi layered double hydroxides (LDH) and related monometallic hydroxides (Ni(OH)2 and Co(OH)2 ) were synthesized by a facile, simple and inexpensive method under mild condition (50 °C). The resulting products displayed a unique honeycomb-like nanoflakes array assembled two-dimensional (2D) thin sheets structure. Among them, CoNi-LDH thin sheets delivered higher specific capacity (394.5 C g-1 at 1 A g-1 ) with superior cyclic performance (92.3% capacity retention over 10,000 cycles) than Co/Ni monometallic hydroxides owing to the synergistic effect of cobalt and nickel...
August 9, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30118550/redox-targeting-based-flow-batteries-for-large-scale-energy-storage
#3
REVIEW
Ruiting Yan, Qing Wang
Redox-targeting reactions of battery materials by redox molecules are extensively studied for energy storage since the first report in 2006. Implementation of the "redox-targeting" concept in redox flow batteries presents not only an innovative idea of battery design that considerably boosts the energy density of flow-battery system, but also an intriguing research platform applied to a wide variety of chemistries for different applications. Here, a critical overview of the recent progress in redox-targeting-based flow batteries is presented and the development of the technology in the various aspects from mechanistic understanding of the reaction kinetics to system optimization is highlighted...
August 17, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30118549/manganese-oxide-based-electrode-materials-for-energy-storage-applications-how-close-are-we-to-the-theoretical-capacitance
#4
REVIEW
Yating Hu, Yue Wu, John Wang
Of the transition metals, Mn has the greatest number of different oxides, most of which have a special tunnel structure that enables bulk redox reactions. The high theoretical capacitance and capacity results from a greater number of accessible oxidation states than other transition metals, wide potential window, and the high natural abundance make MnOx species promising electrode materials for energy storage applications. Although MnOx electrode materials have been intensely studied over the past decade, their electrochemical performance is still insufficient for practical applications...
August 17, 2018: Advanced Materials
https://www.readbyqxmd.com/read/30118212/use-phase-drives-lithium-ion-battery-life-cycle-environmental-impacts-when-used-for-frequency-regulation
#5
Nicole A Ryan, Yashen Lin, Noah Mitchell-Ward, Johanna L Mathieu, Jeremiah X Johnson
Battery storage systems are attractive alternatives to conventional generators for frequency regulation due to their fast response time, high cycle efficiency, flexible scale, and decreasing cost. However, their implementation does not consistently reduce environmental impacts. To assess these impacts, we employed a life cycle assessment (LCA) framework. Our framework couples cradle-to-gate and end-of-life LCA data on lithium-ion batteries with a unit commitment and dispatch model. The model is run on a 9-bus power system with energy storage used for frequency regulation...
August 17, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/30118131/diffusion-controlled-multilayer-electrocatalysts-via-graphene-oxide-nanosheets-of-varying-sizes
#6
Minsu Gu, Jaewon Choi, Taemin Lee, Minju Park, Ik-Soo Shin, Jinkee Hong, Hyun-Wook Lee, Byeong-Su Kim
Controlling the architecture of hybrid nanomaterial electrodes is critical for understanding their fundamental electrochemical mechanisms and applying these materials in future energy conversion and storage systems. Herein, we report highly tunable electrocatalytic multilayer electrodes, composed of palladium nanoparticles (Pd NPs) supported by graphene sheets of varying lateral sizes, employing a versatile layer-by-layer (LbL) assembly method. We demonstrate that the electrocatalytic activity is highly tunable through the control of the diffusion and electron pathways within the 3-dimensional multilayer electrodes...
August 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30118114/a-rationally-designed-fe-tetrapyridophenazine-complex-a-promising-precursor-to-a-single-atom-fe-catalyst-for-an-efficient-oxygen-reduction-reaction-in-high-power-zn-air-cells
#7
Zheng Kun Yang, Cheng-Zong Yuan, An-Wu Xu
The development of low-cost and highly efficient single-atom oxygen reduction catalysts to replace platinum for fuel cells and metal-air cells is highly desirable but remains challenging. Herein, we report the fabrication of isolated single-atom Fe anchored on porous nitrogen-doped carbon from the pyrolysis of a well-designed solely Fe-tetrapyridophenazine coordination complex. The N-rich bridging ligand, tetrapyridophenazine (tpphz) is first employed as a spatial isolation agent of Fe that suppresses its aggregation during high temperature pyrolysis, resulting in highly reactive and stable single-atom Fe ORR catalysts...
August 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30117734/layered-g-c3n4-reduced-graphene-oxide-composites-as-anodes-with-improved-rate-performance-for-lithium-ion-batteries
#8
Shuguang Wang, Yanhong Shi, Chao-Ying Fan, Jinhua Liu, Yanfei Li, Xing-Long Wu, Haiming Xie, Jingping Zhang, Haizhu Sun
As important anodes in lithium-ion batteries (LIBs), graphene is always faced with the aggregation problem that makes most of active sites lose their function at high current densities, resulting in low Li-ion intercalation capacity and poor rate performance. To address this issue, layered g-C3N4@reduced graphene oxide composite (g-C3N4@RGO) was prepared via a scalable and easy strategy. The resulted g-C3N4@RGO possesses large interlayer distances, rich N-active sites and microporous structure, which largely improves Li storage performance...
August 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30117725/enabling-effective-electrocatalytic-n2-conversion-to-nh3-by-tio2-nanosheets-array-under-ambient-conditions
#9
Rong Zhang, Xiang Ren, Xifeng Shi, Fengyu Xie, Baozhan Zheng, Guo Xiaodong, Xuping Sun
NH3 serves as an attractive hydrogen storage medium and a renewable energy sector for a sustainable future. Electrochemical reduction is a feasible ambient reaction to convert N2 to NH3 while needs efficient electrocatalysts for the N2 reduction reaction (NRR) to meet the challenge associated with N2 activation. In this letter, we report on our recent experimental finding that TiO2 nanosheets array on Ti plate (TiO2/Ti) is effective for electrochemical N2 conversion to NH3 at ambient conditions. When tested in 0...
August 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30117651/lithium-versus-mono-polyvalent-ion-intercalation-hybrid-metal-ion-systems-for-energy-storage
#10
REVIEW
Radostina Stoyanova, Violeta Koleva, Antonia Stoyanova
The energy storage by redox intercalation reactions is, nowadays, the most effective rechargeable ion battery. When lithium is used as intercalating agents, the high energy density is achieved at an expense of non-sustainability. The replacement of Li+ with cheaper monovalent ions enables to make greener battery alternatives. The utilization of polyvalent ions instead of Li+ permits to multiplying the battery capacity. Contrary to Li+ , the realization of quick and reversible intercalation of bigger monovalent and of polyvalent ions is a scientific challenge due to kinetic constraints, polarizing ion effects and Coulomb interactions...
August 17, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30117518/sandwiched-spherical-tin-dioxide-graphene-with-a-three-dimensional-interconnected-closed-pore-structure-for-lithium-storage
#11
Bing Zhao, Zhixuan Wang, Shanshan Wang, Jinlong Jiang, Jian Si, Shoushuang Huang, Zhiwen Chen, Wenrong Li, Yong Jiang
Low reversion of lithium oxide (Li2O) and the tin (Sn) coarsening causing irreversible capacity loss is the main reason for the poor cycle performance in tin dioxide (SnO2) based composites. In this research, a novel sandwiched spherical tin dioxide/graphene with a three-dimensional interconnected closed pore structure is synthesized. The microstructural characterization shows that the spherical graphene with submicron sized diameters interconnects with each other forming an interconnected flexible conductive network, whereas a large number of SnO2 nanoparticles (approximately 5 nm) are limited homogeneously in between the interlayers of the sphere-like graphene shell...
August 17, 2018: Nanoscale
https://www.readbyqxmd.com/read/30117249/nanostructured-sns2-thin-films-from-laser-ablated-nanocolloids-structure-morphology-optoelectronic-and-electrochemical-properties
#12
Sadasivan Shaji, Jacob Johny, Selene Sepulveda Guzman, Bindu Krishnan, David Avellaneda Avellaneda
Tin disulfide (SnS2) is a binary chalcogenide semiconductor having applications in solar cells, energy storage and optoelectronics. SnS2 thin films were deposited by spraying the nanocolloids synthesized using pulsed laser ablation in liquid. Studies on the structure, morphology and optoelectronic properties have been carried out for the films obtained from two liquid media (ethanol and isopropanol) and after heat treatments. X-ray diffraction analysis confirmed the hexagonal crystal structure of the films whereas the 2-H polytype structure was identified by micro-Raman spectroscopy...
August 16, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/30117247/h2-oxidation-electrocatalysis-enabled-by-metal-to-metal-hydrogen-atom-transfer-a-homolytic-approach-to-a-heterolytic-reaction
#13
Geoffrey M Chambers, Eric S Wiedner, R Morris Bullock
H2 is used on a huge scale industrially, and has received increased attention for chemical energy storage. Oxidation of H2 in a fuel cell converts the chemical energy of the H-H bond into electricity. Electrocatalytic oxidation of H2 by molecular catalysts typically requires one metal to perform multiple chemical steps: bind H2, heterolytically cleave H2, and then undergo two oxidation and two deprotonation steps. We discovered the electrocatalytic oxidation of H2 by a cooperative system using Cp*Cr(CO)3H and [Fe(diphosphine)(CO)3]+...
August 16, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/30115754/phosphatidylcholine-synthesis-regulates-triglyceride-storage-and-chylomicron-secretion-by-caco2-cells
#14
Jonghwa Lee, Neale D Ridgway
Intracellular lipid droplets (LDs) supply fatty acids for energy, membrane biogenesis, and lipoprotein secretion. The surface monolayer of LDs is composed of phospholipids, primarily phosphatidylcholine (PC), that stabilize the neutral lipid core of TG. To determine the relationship between PC synthesis and TG storage and secretion in chylomicrons, we used a model of intestinal-derived human epithelial colorectal adenocarcinoma (Caco2) cells with knockout of PCYT1A, which encodes the rate-limiting enzyme CTP:phosphocholine cytidylyltransferase α (CCTα) in the CDP-choline pathway, that were treated with the fatty acid oleate...
August 16, 2018: Journal of Lipid Research
https://www.readbyqxmd.com/read/30114646/hollow-ag-44-pt-56-nanotube-bundles-with-high-electrocatalytic-performances-for-hydrogen-evolution-and-ethylene-glycol-oxidation-reactions
#15
Xiao-Yan Zhu, Lu Zhang, Pei-Xin Yuan, Jiu-Ju Feng, Junhua Yuan, Qian-Li Zhang, Ai-Jun Wang
It is a main challenge to synthesize highly efficient and durable nanocatalysts towards hydrogen evolution reaction (HER) and alcohol oxidation reaction in energy conversion and storage. Herein, a green wet-chemical approach was developed to directly prepare hollow Ag44 Pt56 nanotube bundles (H-Ag44 Pt56 NTBs), utilizing 5-azacytosine as a structure-directing agent. The obtained electrocatalyst displayed superior catalytic activity and durability for HER in acid media, and the great improvement in catalytic performance for ethylene glycol oxidation reaction (EGOR) in the alkaline electrolyte, outperforming home-made Ag34 Pt66 nanoparticles (NPs), Ag70 Pt30 NPs, and commercial Pt/C catalysts...
August 7, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30114572/co-2-capture-and-storage-a-way-forward-for-sustainable-environment
#16
M N Anwar, A Fayyaz, N F Sohail, M F Khokhar, M Baqar, W D Khan, K Rasool, M Rehan, A S Nizami
The quest for a sustainable environment and combating global warming, carbon capture, and storage (CCS) has become the primary resort. A complete shift from non-renewable resources to renewable resources is currently impossible due to its major share in energy generation; making CCS an imperative need of the time. This study, therefore, aims to examine the reckoning of carbon dioxide (CO2 ), measurement methods, and its efficient capture and storage technologies with an ambition to combat global warming and achieve environmental sustainability...
August 13, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/30114400/conserved-transcriptional-activity-and-ligand-responsiveness-of-avian-ppars-potential-role-in-regulating-lipid-metabolism-in-mirgratory-birds
#17
Angelica Hamilton, Jennifer Ly, Jasmine R Robinson, Keely R Corder, Kristen J DeMoranville, Paul J Schaeffer, Janice M Huss
Migratory birds undergo metabolic remodeling in tissues, including increased lipid storage in white adipose and fatty acid uptake and oxidation in skeletal muscle, to optimize energy substrate availability and utilization in preparation for long-distance flight. Different tissues undergo gene expression changes in keeping with their specialized functions and driven by tissue specific transcriptional pathways. Peroxisome proliferator-activated receptors (PPARs) are lipid-activated nuclear receptors that regulate metabolic pathways involved in lipid and glucose utilization or storage in mammals...
August 13, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/30113813/graphene-loaded-bi2se3-a-conversion-alloying-type-anode-material-for-ultrafast-gravimetric-and-volumetric-na-storage
#18
Dan Li, Jisheng Zhou, Xiaohong Chen, Huaihe Song
Sodium ion battery (SIB) has been a promising alternative for sustainable electrochemical energy-storage devices. However, it still needs great efforts to develop electrode materials with ultrafast gravimetric and volumetric Na-storage performance, due to difficult balance between Na-ion diffusion kinetics and pressing density of materials. In this work, Bi2Se3/graphene composites, synthesized by a selenization reaction, are investigated as anode materials for SIBs. Na-ion storage mechanism of Bi2Se3 should be attributed to a combined conversion-alloying one by a series of ex-situ measurements...
August 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30113063/high-performance-asymmetric-supercapacitors-based-on-monodisperse-mno-nanocrystals-with-high-energy-densities
#19
Menggang Li, Wenjuan Lei, Yongsheng Yu, Weiwei Yang, Ji Li, Dafa Chen, Shichong Xu, Ming Feng, Haibo Li
Monodisperse spherical MnO nanocrystals (NCs) with a size of 22.5 nm were synthesized by the thermal decomposition of manganese oleate in the presence of oleic acid and 1-octadecene. The as-synthesized MnO NCs show superior electrochemical performances with a specific capacitance of 736.4 F g-1 at a current density of 1 A g-1 and retain 93.3% of initial specific capacitance after 5000 cycles. The MnO NC electrode was successfully assembled in an asymmetric supercapacitor as the cathode with an activated carbon (AC) electrode as the anode...
August 16, 2018: Nanoscale
https://www.readbyqxmd.com/read/30112463/endoplasmic-reticulum-vacuole-contact-sites-bloom-with-stress-induced-lipid-droplets
#20
W Mike Henne, Hanaa Hariri
Lipid droplets (LDs) serve as specialized cytoplasmic organelles that harbor energy-rich lipids for long-term storage and may be mobilized as nutrient sources during extended starvation. How cells coordinate LD biogenesis and utilization in response to fluctuations in nutrient availability remains poorly understood. Here, we discuss our recent work revealing how yeast spatially organize LD budding at organelle contacts formed between the endoplasmic reticulum and yeast vacuole/lysosome (sites known as nucleus-vacuole junctions [NVJs])...
January 2018: Contact
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