scholarly journals Molecular grafting towards high-fraction active nanodots implanted in N-doped carbon for sodium dual-ion batteries

2020 ◽  
Author(s):  
Sainan Mu ◽  
Qirong Liu ◽  
Pinit Kidkhunthod ◽  
Xiaolong Zhou ◽  
Wenlou Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Large Scale ◽  
Specific Capacity ◽  
Rate Capability ◽  
Cycling Stability ◽  
Capacity Retention ◽  
Discharge Performance ◽  
High Fraction ◽  
Energy Storage Applications ◽  
Fraction Active

Abstract Sodium-based dual-ion batteries (Na-DIBs) show a promising potential for large-scale energy storage applications due to the merits of environmental friendliness and low cost. However, Na-DIBs are generally subject to poor rate capability and cycling stability for the lack of suitable anodes to accommodate large Na+ ions. Herein, we propose a molecular grafting strategy to in situ synthesize tin pyrophosphate nanodots implanted in N-doped carbon matrix (SnP2O7@N-C), which exhibits a high fraction of active SnP2O7 up to 95.6 wt% and a low content of N-doped carbon (4.4 wt%) as the conductive framework. As a result, this anode delivers a high specific capacity ∼400 mAh g−1 at 0.1 A g−1, excellent rate capability up to 5.0 A g−1 and excellent cycling stability with a capacity retention of 92% after 1200 cycles under a current density of 1.5 A g−1. Further, pairing this anode with an environmentally friendly KS6 graphite cathode yields a SnP2O7@N-C||KS6 Na-DIB, exhibiting an excellent rate capability up to 30 C, good fast-charge/slow-discharge performance and long-term cycling life with a capacity retention of ∼96% after 1000 cycles at 20 C. This study provides a feasible strategy to develop high-performance anodes with high-fraction active materials for Na-based energy storage applications.

scholarly journals Enhanced Potassium-Ion Storage of the 3D Carbon Superstructure by Manipulating the Nitrogen-Doped Species and Morphology

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Yanhua Li ◽  
Kui Xiao ◽  
Cong Huang ◽  
Jin Wang ◽  
Ming Gao ◽  
...  
Keyword(s):  
Energy Storage ◽  
High Performance ◽  
Density Functional ◽  
Large Scale ◽  
Specific Capacity ◽  
Rate Capability ◽  
High Energy ◽  
Potassium Ion ◽  
High Energy Density ◽  
Superior Performance

Abstract Potassium-ion batteries (PIBs) are attractive for grid-scale energy storage due to the abundant potassium resource and high energy density. The key to achieving high-performance and large-scale energy storage technology lies in seeking eco-efficient synthetic processes to the design of suitable anode materials. Herein, a spherical sponge-like carbon superstructure (NCS) assembled by 2D nanosheets is rationally and efficiently designed for K+ storage. The optimized NCS electrode exhibits an outstanding rate capability, high reversible specific capacity (250 mAh g−1 at 200 mA g−1 after 300 cycles), and promising cycling performance (205 mAh g−1 at 1000 mA g−1 after 2000 cycles). The superior performance can be attributed to the unique robust spherical structure and 3D electrical transfer network together with nitrogen-rich nanosheets. Moreover, the regulation of the nitrogen doping types and morphology of NCS-5 is also discussed in detail based on the experiments results and density functional theory calculations. This strategy for manipulating the structure and properties of 3D materials is expected to meet the grand challenges for advanced carbon materials as high-performance PIB anodes in practical applications.

Nanocubes composed of FeS2@C nanoparticles as advanced anode materials for K-ion storage

2020 ◽  
Vol 7 (2) ◽  
pp. 394-401 ◽  
Author(s):  
Yushan Luo ◽  
Mengli Tao ◽  
Jianhua Deng ◽  
Renming Zhan ◽  
Bingshu Guo ◽  
...  
Keyword(s):  
Anode Materials ◽  
Specific Capacity ◽  
Rate Capability ◽  
Cycling Stability ◽  
Core Shell ◽  
Capacity Retention ◽  
Storage Performance ◽  
Ion Storage ◽  
Excellent Cycling Stability ◽  
Unique Core

The unique core–shell structural FeS2@C nanocubes display outstanding K-storage performance with impressive specific capacity, excellent cycling stability and superior rate capability with 73% capacity retention at 2 A g−1.

scholarly journals Hierarchical N-Doped Porous Carbons for Zn–Air Batteries and Supercapacitors

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Beibei Guo ◽  
Ruguang Ma ◽  
Zichuang Li ◽  
Shaokui Guo ◽  
Jun Luo ◽  
...  
Keyword(s):  
Surface Area ◽  
Large Scale ◽  
Specific Capacity ◽  
Cycling Stability ◽  
Porous Carbons ◽  
Supercapacitor Electrode ◽  
Hydrogen Electrode ◽  
Discharge Performance ◽  
Onset Potential ◽  
Electrocatalytic Oxygen Reduction

AbstractNitrogen-doped carbon materials with a large specific surface area, high conductivity, and adjustable microstructures have many prospects for energy-related applications. This is especially true for N-doped nanocarbons used in the electrocatalytic oxygen reduction reaction (ORR) and supercapacitors. Here, we report a low-cost, environmentally friendly, large-scale mechanochemical method of preparing N-doped porous carbons (NPCs) with hierarchical micro-mesopores and a large surface area via ball-milling polymerization followed by pyrolysis. The optimized NPC prepared at 1000 °C (NPC-1000) offers excellent ORR activity with an onset potential (Eonset) and half-wave potential (E1/2) of 0.9 and 0.82 V, respectively (vs. a reversible hydrogen electrode), which are only approximately 30 mV lower than that of Pt/C. The rechargeable Zn–air battery assembled using NPC-1000 and the NiFe-layered double hydroxide as bifunctional ORR and oxygen evolution reaction electrodes offered superior cycling stability and comparable discharge performance to RuO2 and Pt/C. Moreover, the supercapacitor electrode equipped with NPC prepared at 800 °C exhibited a high specific capacity (431 F g−1 at 10 mV s−1), outstanding rate, performance, and excellent cycling stability in an aqueous 6-M KOH solution. This work demonstrates the potential of the mechanochemical preparation method of porous carbons, which are important for energy conversion and storage.

scholarly journals A porous graphene–NiFe2O4 nanocomposite with high electrochemical performance and high cycling stability for energy storage applications

2020 ◽  
Vol 2 (9) ◽  
pp. 4229-4241 ◽  
Author(s):  
Meenaketan Sethi ◽  
U. Sandhya Shenoy ◽  
D. Krishna Bhat
Keyword(s):  
Energy Storage ◽  
Electrochemical Performance ◽  
Solvothermal Synthesis ◽  
Rate Capability ◽  
High Specific Capacitance ◽  
Cycling Stability ◽  
High Rate ◽  
High Rate Capability ◽  
Porous Graphene ◽  
Energy Storage Applications

Solvothermal synthesis of a porous graphene–NiFe2O4 nanocomposite exhibiting high specific capacitance and high rate capability along with high cycling stability.

Ultrathin Carbon Nanosheets for Highly-efficient Capacitive K-ion and Zn-ion Storage

2020 ◽  
Author(s):  
Yamin Zhang ◽  
Zhongpu Wang ◽  
Deping Li ◽  
Qing Sun ◽  
Kangrong Lai ◽  
...  
Keyword(s):  
Energy Storage ◽  
Porous Carbon ◽  
Metal Ion ◽  
Rate Capability ◽  
Energy Storage Devices ◽  
Capacity Retention ◽  
Carbon Nanosheets ◽  
Storage Devices ◽  
High Efficient ◽  
Ion Storage

<p></p><p>Porous carbon has attracted extensive attentions as the electrode material for various energy storage devices considering its advantages like high theoretical capacitance/capacity, high conductivity, low cost and earth abundant inherence. However, there still exists some disadvantages limiting its further applications, such as the tedious fabrication process, limited metal-ion transport kinetics and undesired structure deformation at harsh electrochemical conditions. Herein, we report a facile strategy, with calcium gluconate firstly reported as the carbon source, to fabricate ultrathin porous carbon nanosheets. <a>The as-prepared Ca-900 electrode delivers excellent K-ion storage performance including high reversible capacity (430.7 mAh g<sup>-1</sup>), superior rate capability (154.8 mAh g<sup>-1</sup> at an ultrahigh current density of 5.0 A g<sup>-1</sup>) and ultra-stable long-term cycling stability (a high capacity retention ratio of ~81.2% after 4000 cycles at 1.0 A g<sup>-1</sup>). </a>Similarly, when being applied in Zn-ion capacitors, the Ca-900 electrode also exhibits an ultra-stable cycling performance with ~90.9% capacity retention after 4000 cycles at 1.0 A g<sup>-1</sup>, illuminating the applicable potentials. Moreover, the origin of the fast and smooth metal-ion storage is also revealed by carefully designed consecutive CV measurements. Overall, considering the facile preparation strategy, unique structure, application flexibility and in-depth mechanism investigations, this work will deepen the fundamental understandings and boost the commercialization of high-efficient energy storage devices like potassium-ion/sodium-ion batteries, zinc-ion batteries/capacitors and aluminum-ion batteries.</p><br><p></p>

High energy density aqueous zinc–benzoquinone batteries enabled by carbon cloth with multiple anchoring effects

2021 ◽  
Author(s):  
Zhiqiang Luo ◽  
Silin Zheng ◽  
Shuo Zhao ◽  
Xin Jiao ◽  
Zongshuai Gong ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Porous Carbon ◽  
Large Scale ◽  
High Energy ◽  
High Energy Density ◽  
Carbon Cloth ◽  
Anchoring Effects ◽  
High Theoretical Capacity ◽  
Energy Storage Applications

Benzoquinone with high theoretical capacity is anchored on N-plasma engraved porous carbon as a desirable cathode for rechargeable aqueous Zn-ion batteries. Such batteries display tremendous potential in large-scale energy storage applications.

Nano-dendrite structured cobalt phosphide based hybrid supercapacitor with high energy storage and cycling stability

2021 ◽  
Author(s):  
Xiaoyu Chen ◽  
Pu Chang ◽  
Shuo Zhang ◽  
Lixiu Guan ◽  
Guohe Ren ◽  
...  
Keyword(s):  
Energy Storage ◽  
Specific Capacity ◽  
High Energy ◽  
Cycling Stability ◽  
Activation Process ◽  
Carbon Cloth ◽  
Cobalt Phosphide ◽  
Improved Performance ◽  
Transition Metal Phosphides ◽  
High Energy Storage

Abstract The supercapacitors possessing high energy storage and long serving period have strategic significance to solve the energy crisis issues. Herein, fluffy nano-dendrite structured cobalt phosphide (CoP) is grown on carbon cloth through simple hydrothermal and electrodeposition treatments (CoP/C-HE). Benefit from its excellent electrical conductivity and special structure, CoP/C-HE manifests a high specific capacity of 461.4 C g-1 at 1 A g-1. Meanwhile, the capacity retention remains 92.8% over 10000 cycles at 5 A g-1, proving the superior cycling stability. The phase conversion of Co2P during the activation process also contributes to the improved performance. The assembled two-electrode asymmetric supercapacitor demonstrates excellent performance in terms of energy density (42.4 W h kg-1 at a power density of 800.0 W kg-1) and cycling stability (86.3% retention over 5000 cycles at 5 A g-1), which is superior to many reported cobalt-based supercapacitors. Our work promotes the potential of transition metal phosphides for the applications in supercapacitors.

Tuning Ferrous Coordination Structure Enables a Highly Reversible Fe Anode for Long-life All-iron Flow Batteries

2021 ◽  
Author(s):  
Yuxi Song ◽  
Kaiyue Zhang ◽  
Xiangrong Li ◽  
Chuanwei Yan ◽  
Qinghua Liu ◽  
...  
Keyword(s):  
Energy Storage ◽  
Large Scale ◽  
Low Cost ◽  
Flow Battery ◽  
Coordination Structure ◽  
Promising Alternative ◽  
Flow Batteries ◽  
Energy Storage Applications ◽  
Long Life ◽  
Hydrolysis Of

Aqueous all-iron flow battery is a promising alternative for large-scale energy storage applications due to low cost and high safety. However, inferior Fe plating/stripping reversibility and hydrolysis of Fe2+ at...

scholarly journals Behavior of Compacted Magnesium-Based Powders for Energy-Storage Applications

Inorganics ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 54 ◽  
Author(s):  
Daniele Mirabile Gattia ◽  
Mukesh Jangir ◽  
Indra Prabh Jain
Keyword(s):  
Energy Storage ◽  
Hydrogen Storage ◽  
Large Scale ◽  
Storage Capacity ◽  
Structural Information ◽  
Rietveld Analysis ◽  
Magnesium Hydride ◽  
Cycling Stability ◽  
Hydrogen Release ◽  
Phase Identification

Energy storage is one of the main challenges to address in the near future—in particular due to the intermittent energy produced by extensive renewable energy production plants. The use of hydrides for this type of energy storage has many positive aspects. Hydride-based systems consist of absorption and desorption reactions that are strongly exothermic and endothermic, respectively. Heat management in the design of hydrogen storage tanks is an important issue, in order to ensure high-level performance in terms of the kinetics for hydrogen release/uptake and reasonable storage capacity. When loose powder is used, material in the form of pellets should be considered in order to avoid detrimental effects including decreased cycling performance. Moreover, sustainable materials in large-scale hydrogen reactors could be recovered and reused to improve any life cycle analysis of such systems. For these reasons, magnesium hydride was used in this study, as it is particularly suitable for hydrogen storage due to its high H2 storage capacity, reversibility and the low costs. Magnesium hydride was ball-milled in presence of 5 wt % Fe as a catalyst, then compacted with an uniaxial press after the addition of expanded natural graphite (ENG). The materials underwent 45 cycles in a Sievert’s type apparatus at 310 °C and eight bar, in order to study the kinetics and cycling stability. Scanning electron microscopy was used to investigate microstructural properties and failure phenomena. Together with Rietveld analysis, X-ray diffraction was performed for phase identification and structural information. The pellets demonstrated suitable cycling stability in terms of total hydrogen storage capacity and kinetics.

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