Novel Fe2P/graphitized carbon yolk/shell octahedra for high-efficiency hydrogen production and lithium storage

2016 ◽  
Vol 4 (25) ◽  
pp. 9923-9930 ◽  
Author(s):  
Jiao Yang ◽  
Ya Ouyang ◽  
Huijuan Zhang ◽  
Haitao Xu ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Production ◽  
High Efficiency ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Storage ◽  
Graphitized Carbon

Fe2P/GC yolk/shell octahedra exhibit a superior specific capacity and rate capability for LIBs and an excellent catalytic activity toward the HER.

Fabrication of Uniform Fe3O4 Nanocubes Derived from Prussian Blue and Enhanced Performance for Lithium Storage Properties

NANO ◽  
2020 ◽  
Vol 15 (08) ◽  
pp. 2050108
Author(s):  
Youzhen Dong ◽  
Xia Ding ◽  
Wei Gu ◽  
Zhifeng Yang
Keyword(s):  
Thermal Decomposition ◽  
Electrochemical Performance ◽  
Prussian Blue ◽  
High Efficiency ◽  
Structural Characteristics ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Energy Storage And Conversion ◽  
Lithium Storage

Owing to the special structural characteristics, oxide derivatives of Prussian blue (PB)-based hollow structures are widely used in electrochemical energy storage and conversion. Here, Fe3O4 particles have been synthesized by one-step thermal decomposition of PB. The cube-sized iron-based PB and structural stability of thermal decomposition products at different amount of polyvinyl pyrrolidone (PVP) were well investigated. In the derivatived architecature, the hollow Fe3O4 nanocubes provide high-efficiency lithium ion transporation and the diffusion of electrolyte, enabling better electrochemical performance. The as-obtained Fe3O4 nanocubes show a remarkable rate capability (462[Formula: see text]mAh[Formula: see text]g[Formula: see text] at 1.0[Formula: see text]A/g) and outstanding specific capacity (803[Formula: see text]mAh[Formula: see text]g[Formula: see text] at 0.1[Formula: see text]A/g, 97.5% capacity retention over 140 cycles), which have a potential application as anode materials for lithium ion batteries due to the facile preparation method and high electrochemical performance.

Uniform small-sized MoS2 from novel solution-based microwave-assisted method with exceptional reversible lithium storage properties

Nanoscale ◽  
2018 ◽  
Vol 10 (32) ◽  
pp. 15222-15228 ◽  
Author(s):  
Xuehui Tian ◽  
Qiuming Gao ◽  
Hang Zhang ◽  
Zeyu Li ◽  
Hong Xiao ◽  
...  
Keyword(s):  
Specific Capacity ◽  
Rate Capability ◽  
Cyclic Stability ◽  
Lithium Storage ◽  
Microwave Assisted ◽  
Pyrolysis Method ◽  
Microwave Assisted Method ◽  
Storage Properties

Small-sized MoS2 prepared via a solution-based microwave-assisted precursor pyrolysis method exhibited remarkably large specific capacity, excellent rate capability and fascinatingly high cyclic stability.

Constructing zigzag-like hollow mesoporous nanospheres MoO2/C with superior lithium storage performance

2021 ◽  
Author(s):  
Wencai Zhao ◽  
Y.F. Yuan ◽  
S.M. Yin ◽  
Gaoshen Cai ◽  
S.Y. Guo
Keyword(s):  
Reaction Kinetics ◽  
Discharge Capacity ◽  
Amorphous Carbon ◽  
Electronic Conductivity ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Structure Design ◽  
Structure Stability ◽  
Lithium Storage

Abstract Hollow mesoporous nanospheres MoO2/C are successfully constructed through metal chelating reaction between molybdenum acetylacetone and glycerol as well as the Kirkendall effect induced by diammonium hydrogen phosphate. MoO2 nanoparticles coupled by amorphous carbon are assembled to unique zigzag-like hollow mesoporous nanosphere with large specific surface area of 147.7 m2 g-1 and main pore size of 8.7 nm. The content of carbon is 9.1%. As anode material for lithium-ion batteries, the composite shows high specific capacity and excellent cycling performance. At 0.2 A g-1, average discharge capacity stabilizes at 1092 mAh g-1. At 1 A g-1 after 700 cycles, the discharge capacity still reaches 512 mAh g-1. Impressively, the composite preserves intact after 700 cycles. Even at 5 A g-1, the discharge capacity can reach 321 mAh g-1, exhibiting superior rate capability. Various kinetics analyses demonstrate that in electrochemical reaction, the proportion of the surface capacitive effect is higher, and the composite has relatively high diffusion coefficient of Li ions and fast faradic reaction kinetics. Excellent lithium storge performance is attributed to the synergistic effect of zigzag-like hollow mesoporous nanosphere and amorphous carbon, which improves reaction kinetics, structure stability and electronic conductivity of MoO2. The present work provides a new useful structure design strategy for advanced energy storage application of MoO2.

Synergistic effect between flake graphite and small-sized graphene in lithium storage

2021 ◽  
pp. 2150031
Author(s):  
Hai Li ◽  
Chunxiang Lu
Keyword(s):  
Synergistic Effect ◽  
Lithium Ion Batteries ◽  
Individual Component ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Flake Graphite ◽  
Effective Strategy ◽  
Lithium Storage

As anode material for lithium-ion batteries, graphite has the disadvantage of relatively low specific capacity. In this work, a simple yet effective strategy to overcome the disadvantages by using a composite of flake graphite (FG) and small-sized graphene (SG) has been developed. The FG/SG composite prepared by dispersing FG and SG (90:10 w/w) in ethanol and drying delivers much higher specific capacity than that of individual component except for improved rate capability. More surprisingly, FG/SG composite delivers higher reversible capacity than its theoretical value calculated according to the theoretical capacities of graphite and graphene. Therefore, a synergistic effect between FG and SG in lithium storage is clearly discovered. To explain it, we propose a model that abundant nanoscopic cavities were formed due to physical adhesion between FG and SG and could accommodate extra lithium.

General synthesis of three-dimensional alkali metal vanadate aerogels with superior lithium storage properties

2016 ◽  
Vol 4 (37) ◽  
pp. 14408-14415 ◽  
Author(s):  
Guozhao Fang ◽  
Jiang Zhou ◽  
Caiwu Liang ◽  
Yangsheng Cai ◽  
Anqiang Pan ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Specific Capacity ◽  
Three Dimensional ◽  
Rate Capability ◽  
Lithium Storage ◽  
High Specific Capacity ◽  
General Synthesis ◽  
Storage Properties ◽  
Good Rate Capability ◽  
General Method

We demonstrate a general method for the preparation of a series of 3D alkali metal vanadate aerogels, including NaV3O8, NaV6O15, and K0.25V2O5. The resulting aerogels exhibit excellent Li+ storage properties in terms of high specific capacity, good rate capability, and outstanding cyclic stability as cathodes for LIBs.

Polypyrrole-assisted synthesis of roselike MoS2/nitrogen-containing carbon/graphene hybrids and their robust lithium storage performances

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62624-62629 ◽  
Author(s):  
Zhiyan Guo ◽  
Yang Zhong ◽  
Zongwei Xuan ◽  
Changming Mao ◽  
Fanglin Du ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Lithium Storage ◽  
High Specific Capacity

MoS2/NC/G hybrids exhibit a high specific capacity, and superior rate capability for lithium ion batteries.

scholarly journals Metal–Oleate Complex-Derived Bimetallic Oxides Nanoparticles Encapsulated in 3D Graphene Networks as Anodes for Efficient Lithium Storage with Pseudocapacitance

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Yingying Cao ◽  
Kaiming Geng ◽  
Hongbo Geng ◽  
Huixiang Ang ◽  
Jie Pei ◽  
...  
Keyword(s):  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Diffusion Path ◽  
Cycling Performance ◽  
Lithium Storage ◽  
Graphene Oxides ◽  
3D Graphene ◽  
Metal Oleate ◽  
Bimetallic Oxides

Abstract In this manuscript, we have demonstrated the delicate design and synthesis of bimetallic oxides nanoparticles derived from metal–oleate complex embedded in 3D graphene networks (MnO/CoMn2O4 ⊂ GN), as an anode material for lithium ion batteries. The novel synthesis of the MnO/CoMn2O4 ⊂ GN consists of thermal decomposition of metal–oleate complex containing cobalt and manganese metals and oleate ligand, forming bimetallic oxides nanoparticles, followed by a self-assembly route with reduced graphene oxides. The MnO/CoMn2O4 ⊂ GN composite, with a unique architecture of bimetallic oxides nanoparticles encapsulated in 3D graphene networks, rationally integrates several benefits including shortening the diffusion path of Li+ ions, improving electrical conductivity and mitigating volume variation during cycling. Studies show that the electrochemical reaction processes of MnO/CoMn2O4 ⊂ GN electrodes are dominated by the pseudocapacitive behavior, leading to fast Li+ charge/discharge reactions. As a result, the MnO/CoMn2O4 ⊂ GN manifests high initial specific capacity, stable cycling performance, and excellent rate capability.

In Situ Synthesis of Graphitized-Carbon Coated Li4Ti5O12/C Anode for High-Rate Lithium Ion Batteries

2015 ◽  
Vol 814 ◽  
pp. 358-364
Author(s):  
Peng Xiao Huang ◽  
Shui Hua Tang ◽  
Hui Peng ◽  
Xing Li
Keyword(s):  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
Phase Method ◽  
Electrochemical Performances ◽  
Graphitized Carbon ◽  
Carbon Coated

Graphitized-Carbon coated Li4Ti5O12/C (Li4Ti5O12/GC) composites were prepared from Li2CO3, TiO2 and aromatic resorcinol via a facile rheological phase method. The microstructure and morphology of the samples were determined by XRD and SEM. The electrochemical performances of the samples were characterized by galvanostatic charge-discharge test and electrochemical impedance spectroscopy (EIS). The results reveal that the coating of graphitized carbon could effectively enhance the charge/transfer kinetics of the Li4Ti5O12 electrode. The Li4Ti5O12/GC could deliver a discharge specific capacity of 166 mAh/g at 0.2 C, 148 mAh/g at 1.0 C, 142 mAh/g at 3.0 C, 138 mAh/g at 5.0 C and 127 mAh/g at 10.0 C, respectively, and it still could remain at 132 mAh/g after cycled at 5.0 C for 100 cycles. The excellent rate capability of the Li4Ti5O12/C makes it a promising anode material for high rate lithium ion batteries.

Ultrasmall diiron phosphide nanodots anchored on graphene sheets with enhanced electrocatalytic activity for hydrogen production via high-efficiency water splitting

2016 ◽  
Vol 4 (41) ◽  
pp. 16028-16035 ◽  
Author(s):  
Huawei Huang ◽  
Chang Yu ◽  
Juan Yang ◽  
Xiaotong Han ◽  
Changtai Zhao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Production ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Hydrogen Evolution Reaction ◽  
Active Site ◽  
Electrocatalytic Activity ◽  
High Efficiency ◽  
Graphene Sheets

Active site-enriched Fe2P nanodots anchored on graphene sheets (Fe2P-ND/FG) exhibit enhanced catalytic activity and stability for the hydrogen evolution reaction.

scholarly journals Co3V2O8 Nanoparticles Supported on Reduced Graphene Oxide for Efficient Lithium Storage

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 740 ◽  
Author(s):  
Le Hu ◽  
Chaoqun Shang
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Structural Integrity ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Lithium Storage ◽  
Fast Reaction ◽  
Potential Electrode ◽  
Reduced Graphene

Co3V2O8 (CVO) with high theoretical specific capacity derived from the multiple oxidation states of V and Co is regarded as a potential electrode material for lithium-ion batteries (LIBs). Herein, reduced graphene oxide (rGO)-supported ultrafine CVO (rGO@CVO) nanoparticles are successfully prepared via the hydrothermal and subsequent annealing processes. The CVO supported on 2D rGO nanosheets possess excellent structural compatibility for the accommodation of volume variation to maintain the structural integrity of an electrode during the repeated lithiation/delithiation process. On the other hand, the rGO, as a highly-conductive network in the rGO@CVO composite, facilitates rapid charge transfer to ensure fast reaction kinetics. Moreover, the CV kinetic analysis indicates that the capacity of rGO@CVO is mainly dominated by a pseudocapacitive process with favorable rate capability. As a result, the rGO@CVO composite exhibits improved specific capacity (1132 mAh g−1, 0.1 A g−1) and promising rate capability (482 mAh g−1, 10 A g−1).

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