scholarly journals Accessing the Two-Electron Charge Storage Capacity of MnO2 in Mild Aqueous Electrolytes

2020 ◽  
Author(s):  
Mickaël Mateos ◽  
Nikolina Makivic ◽  
Yee-Seul Kim ◽  
Benoit Limoges ◽  
Véronique Balland
Keyword(s):  
High Performance ◽  
Coulombic Efficiency ◽  
Rechargeable Batteries ◽  
Water Soluble ◽  
High Rate ◽  
Charge Storage ◽  
Aqueous Electrolytes ◽  
Energy Storage Devices ◽  
Common View ◽  
Wide Range

<p>Rechargeable batteries based on MnO2 cathodes, able to operate in mild aqueous electrolytes, have attracted remarkable attention due to their appealing features for the design of low-cost stationary energy storage devices. However, the charge/discharge mechanism of MnO2 in such media is still unclear and a matter of debate. Here, an in-depth quantitative spectroelectrochemical analysis of MnO2 thin-films provides a set of important new mechanistic insights. A major finding is that charge storage occurs through the reversible two electron faradaic conversion of MnO2 into water-soluble Mn2+ in the presence of a wide range of weak Brønsted acids, including the [Zn(H2O)6]2+ or [Mn(H2O)6]2+ complexes commonly present in aqueous Zn/MnO2 batteries. Furthermore, it is evidenced that buffered electrolytes loaded with Mn2+ are ideal to achieve highly reversible conversion of MnO2 with both high gravimetric capacity and remarkably stable charging/discharging potentials. In the most favorable case, a record gravimetric capacity of 450 mA·h·g-1 was obtained at a high rate of 1.6 A·g-1, with a coulombic efficiency close to 100% and a MnO2 utilization of 84%. Overall, the present results challenge the common view on MnO2 charge storage mechanism in mild aqueous electrolytes and underline the benefit of buffered electrolytes for high-performance rechargeable aqueous batteries.<br></p>

scholarly journals Accessing the Two-Electron Charge Storage Capacity of MnO2 in Mild Aqueous Electrolytes

2020 ◽  
Author(s):  
Mickaël Mateos ◽  
Nikolina Makivic ◽  
Yee-Seul Kim ◽  
Benoit Limoges ◽  
Véronique Balland
Keyword(s):  
High Performance ◽  
Coulombic Efficiency ◽  
Rechargeable Batteries ◽  
Water Soluble ◽  
High Rate ◽  
Charge Storage ◽  
Aqueous Electrolytes ◽  
Energy Storage Devices ◽  
Common View ◽  
Wide Range

<p>Rechargeable batteries based on MnO2 cathodes, able to operate in mild aqueous electrolytes, have attracted remarkable attention due to their appealing features for the design of low-cost stationary energy storage devices. However, the charge/discharge mechanism of MnO2 in such media is still unclear and a matter of debate. Here, an in-depth quantitative spectroelectrochemical analysis of MnO2 thin-films provides a set of important new mechanistic insights. A major finding is that charge storage occurs through the reversible two electron faradaic conversion of MnO2 into water-soluble Mn2+ in the presence of a wide range of weak Brønsted acids, including the [Zn(H2O)6]2+ or [Mn(H2O)6]2+ complexes commonly present in aqueous Zn/MnO2 batteries. Furthermore, it is evidenced that buffered electrolytes loaded with Mn2+ are ideal to achieve highly reversible conversion of MnO2 with both high gravimetric capacity and remarkably stable charging/discharging potentials. In the most favorable case, a record gravimetric capacity of 450 mA·h·g-1 was obtained at a high rate of 1.6 A·g-1, with a coulombic efficiency close to 100% and a MnO2 utilization of 84%. Overall, the present results challenge the common view on MnO2 charge storage mechanism in mild aqueous electrolytes and underline the benefit of buffered electrolytes for high-performance rechargeable aqueous batteries.<br></p>

scholarly journals Nitrogen-rich covalent organic frameworks with multiple carbonyls for high-performance sodium batteries

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Ruijuan Shi ◽  
Luojia Liu ◽  
Yong Lu ◽  
Chenchen Wang ◽  
Yixin Li ◽  
...  
Keyword(s):  
High Performance ◽  
Density Functional ◽  
Specific Capacity ◽  
Density Functional Theory Calculations ◽  
Rechargeable Batteries ◽  
High Rate ◽  
Ex Situ ◽  
Covalent Organic Frameworks ◽  
Rate Performance ◽  
Practical Applications

AbstractCovalent organic frameworks with designable periodic skeletons and ordered nanopores have attracted increasing attention as promising cathode materials for rechargeable batteries. However, the reported cathodes are plagued by limited capacity and unsatisfying rate performance. Here we report a honeycomb-like nitrogen-rich covalent organic framework with multiple carbonyls. The sodium storage ability of pyrazines and carbonyls and the up-to twelve sodium-ion redox chemistry mechanism for each repetitive unit have been demonstrated by in/ex-situ Fourier transform infrared spectra and density functional theory calculations. The insoluble electrode exhibits a remarkably high specific capacity of 452.0 mAh g−1, excellent cycling stability (~96% capacity retention after 1000 cycles) and high rate performance (134.3 mAh g−1 at 10.0 A g−1). Furthermore, a pouch-type battery is assembled, displaying the gravimetric and volumetric energy density of 101.1 Wh kg−1cell and 78.5 Wh L−1cell, respectively, indicating potentially practical applications of conjugated polymers in rechargeable batteries.

scholarly journals High-capacity rechargeable batteries based on deeply cyclable lithium metal anodes

2018 ◽  
Vol 115 (22) ◽  
pp. 5676-5680 ◽  
Author(s):  
Qiuwei Shi ◽  
Yiren Zhong ◽  
Min Wu ◽  
Hongzhi Wang ◽  
Hailiang Wang
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Coulombic Efficiency ◽  
High Capacity ◽  
Protective Layer ◽  
Rechargeable Batteries ◽  
Metal Electrodes ◽  
Lithium Metal Anodes ◽  
Low Efficiency ◽  
Almost All

Discovering new chemistry and materials to enable rechargeable batteries with higher capacity and energy density is of paramount importance. While Li metal is the ultimate choice of a battery anode, its low efficiency is still yet to be overcome. Many strategies have been developed to improve the reversibility and cycle life of Li metal electrodes. However, almost all of the results are limited to shallow cycling conditions (e.g., 1 mAh cm−2) and thus inefficient utilization (<1%). Here we achieve Li metal electrodes that can be deeply cycled at high capacities of 10 and 20 mAh cm−2 with average Coulombic efficiency >98% in a commercial LiPF6/carbonate electrolyte. The high performance is enabled by slow release of LiNO3 into the electrolyte and its subsequent decomposition to form a Li3N and lithium oxynitrides (LiNxOy)-containing protective layer which renders reversible, dendrite-free, and highly dense Li metal deposition. Using the developed Li metal electrodes, we construct a Li-MoS3 full cell with the anode and cathode materials in a close-to-stoichiometric amount ratio. In terms of both capacity and energy, normalized to either the electrode area or the total mass of the electrode materials, our cell significantly outperforms other laboratory-scale battery cells as well as the state-of-the-art Li ion batteries on the market.

scholarly journals A Sensitive and Rapid UPLC-MS/MS Method for Determination of Monosaccharides and Anti-Allergic Effect of the Polysaccharides Extracted from Saposhnikoviae Radix

Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 1924 ◽  
Author(s):  
Yan-Yan Gao ◽  
Yue Jiang ◽  
Guo-Chao Chen ◽  
Shuang-Shuang Li ◽  
Fei Yang ◽  
...  
Keyword(s):  
High Performance ◽  
Monosaccharide Composition ◽  
Water Soluble ◽  
Delayed Type Hypersensitivity ◽  
Molar Ratio ◽  
Serum Ige ◽  
Organ Index ◽  
Wide Range ◽  
Liquid Chromatography Tandem Mass ◽  
Saposhnikoviae Radix

Background: Allergic disease is a common clinical disease. Natural products provide an important source for a wide range of potential anti-allergic agents. This study was designed to evaluate the anti-allergic activities of the water-soluble polysaccharides extracted and purified from Saposhnikoviae Radix (SRPS). The composition and content of monosaccharides were determined to provide a material basis. Methods: An ultra-high-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) method was established to determine the composition and content of SRPS. 2,4-dinitrofluorobenzene (DNFB) induced a delayed-type hypersensitivity (DTH) mouse model orally administrated SRPS for seven consecutive days. Ear swelling, organ index, and serum IgE levels were observed to evaluate the anti-allergic activities. Results: The UPLC-MS/MS analysis showed that SRPS was consisted of eight monosaccharides including galacturonic acid, mannose, glucose, galactose, rhamnose, fucose, ribose, and arabinose with a relative molar ratio of 4.42%, 7.86%, 23.69%, 12.06%, 3.10%, 0.45%, 0.71%, and 47.70%, respectively. SRPS could effectively reduce ear swelling, a thymus index, and a serum IgE levels. Conclusions: The method was simple, rapid, sensitive, and reproducible, which could be used to analyze and determine the monosaccharide composition of SRPS. The vivo experiments demonstrated that SRPS may effectively inhibit development of DNFB-induced DTH. SRPS is a novel potential resource for natural anti-allergic drugs.

scholarly journals Ternary MOF-Based Redox Active Sites Enabled 3D-on-2D Nanoarchitectured Battery-Type Electrodes for High-Energy-Density Supercapatteries

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Goli Nagaraju ◽  
S. Chandra Sekhar ◽  
Bhimanaboina Ramulu ◽  
Sk. Khaja Hussain ◽  
D. Narsimulu ◽  
...  
Keyword(s):  
Active Sites ◽  
High Performance ◽  
Nickel Foam ◽  
Rate Capability ◽  
Negative Electrode ◽  
High Energy ◽  
High Energy Density ◽  
Phase Method ◽  
Charge Storage ◽  
Energy Storage Devices

Abstract Designing rationally combined metal–organic frameworks (MOFs) with multifunctional nanogeometries is of significant research interest to enable the electrochemical properties in advanced energy storage devices. Herein, we explored a new class of binder-free dual-layered Ni–Co–Mn-based MOFs (NCM-based MOFs) with three-dimensional (3D)-on-2D nanoarchitectures through a polarity-induced solution-phase method for high-performance supercapatteries. The hierarchical NCM-based MOFs having grown on nickel foam exhibit a battery-type charge storage mechanism with superior areal capacity (1311.4 μAh cm−2 at 5 mA cm−2), good rate capability (61.8%; 811.67 μAh cm−2 at 50 mA cm−2), and an excellent cycling durability. The superior charge storage properties are ascribed to the synergistic features, higher accessible active sites of dual-layered nanogeometries, and exalted redox chemistry of multi metallic guest species, respectively. The bilayered NCM-based MOFs are further employed as a battery-type electrode for the fabrication of supercapattery paradigm with biomass-derived nitrogen/oxygen doped porous carbon as a negative electrode, which demonstrates excellent capacity of 1.6 mAh cm−2 along with high energy and power densities of 1.21 mWh cm−2 and 32.49 mW cm−2, respectively. Following, the MOF-based supercapattery was further assembled with a renewable solar power harvester to use as a self-charging station for various portable electronic applications.

Solvent-controlled solid-electrolyte interphase layer composition of a high performance Li4Ti5O12 anode for Na-ion battery applications

2019 ◽  
Vol 3 (9) ◽  
pp. 2490-2498 ◽  
Author(s):  
Binitha Gangaja ◽  
Shantikumar Nair ◽  
Dhamodaran Santhanagopalan
Keyword(s):  
Solid Electrolyte ◽  
High Performance ◽  
Solid Electrolyte Interphase ◽  
High Rate ◽  
Interphase Layer ◽  
Electrode Performance ◽  
Wide Range ◽  
Li4ti5o12 Anode ◽  
Layer Composition

Ultra-high rate Na-ion battery operating over wide range of temperature is demonstrated with engineered-Li4Ti5O12 electrode. Performance with different electrolyte solvents is correlated to the resultant solid-electrolyte interphase layer composition.

scholarly journals High-temperature resistant water-soluble polymers derived from exotic amino acids

RSC Advances ◽  
2020 ◽  
Vol 10 (62) ◽  
pp. 38069-38074
Author(s):  
Sumant Dwivedi ◽  
Aniruddha Nag ◽  
Shigeki Sakamoto ◽  
Yasuyoshi Funahashi ◽  
Toyohiro Harimoto ◽  
...  
Keyword(s):  
Amino Acids ◽  
High Temperature ◽  
High Performance ◽  
Water Soluble ◽  
Water Soluble Polymers ◽  
Soluble Polymers ◽  
Wide Range ◽  
Soluble Polyimide ◽  
Engineering Materials

High-performance water-soluble polymers have a wide range of applications from engineering materials to biomedical plastics. This article discusses the synthesis of water-soluble polyimide from bio-based monomers.

Novel High-Rate Lithium Intercalation Electrode Materials Prepared by LiOH Solution Treatment of TiO2/Carbon Composites

2007 ◽  
Vol 350 ◽  
pp. 199-202 ◽  
Author(s):  
Hideyuki Morimoto ◽  
Kenji Kurita ◽  
Tetsuya Matsuda ◽  
Shinichi Tobishima
Keyword(s):  
Electrode Materials ◽  
Coulombic Efficiency ◽  
Solution Treatment ◽  
High Rate ◽  
Lithium Intercalation ◽  
Carbon Composites ◽  
Composite Electrodes ◽  
Energy Storage Devices ◽  
Discharge Current Density ◽  
Storage Devices

Anatase-type TiO2-based oxide gel /carbon composites were treated chemically with LiOH aqueous solution at 60 °C. The crystalline phase of treated powder was examined by powder x-ray diffraction using CuKα radiation. The main diffraction peaks may be detected as belonging to cubic LiTiO2. High-rate lithium intercalation properties of the samples were estimated in nonaqueous electrolyte including lithium ions. The composite electrodes exhibited high coulombic efficiency over 90% at first cycle and high capacities over 200 mAh g-1 after 200 cycle at large charge-discharge current density of 5.0 mA cm-2 (3.7 A g-1). The composite materials are one of the promising candidates as electrode materials for energy storage devices, such as hybrid capacitor, that require high-power operations.

A proton-hopping charge storage mechanism of ionic one-dimensional coordination polymers for high-performance supercapacitors

2017 ◽  
Vol 53 (86) ◽  
pp. 11786-11789 ◽  
Author(s):  
Nutthaphon Phattharasupakun ◽  
Juthaporn Wutthiprom ◽  
Surasak Kaenket ◽  
Thana Maihom ◽  
Jumras Limtrakul ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Coordination Polymers ◽  
High Performance ◽  
Charge Storage ◽  
Aqueous Electrolytes ◽  
Proton Conducting ◽  
One Dimensional ◽  
Storage Mechanism ◽  
Charge Storage Mechanism

A proton-conducting coordination polymer of Zn2+ phosphate and protonated imidazole has been used as a novel supercapacitor material in aqueous electrolytes.

scholarly journals Application of Ferrites as Electrodes for Supercapacitor

2021 ◽  
Author(s):  
Ankur Soam
Keyword(s):  
High Specific Capacitance ◽  
Charge Storage ◽  
Synthesis Methods ◽  
Energy Storage Devices ◽  
Supercapacitor Application ◽  
Storage Devices ◽  
Mixed Oxidation ◽  
Wide Range ◽  
Operating Potential ◽  
Surface Redox

Apart from the magnetic properties, ferrites have been considered as efficient electrodes for next generation energy storage devices. This chapter will include applications of spinel ferrites such as MnFe2O4, CoFe2O4, ZnFe2O4 and NiFe2O4 in supercapacitor. In ferrites, the charge storage arises from the fast-reversible surface redox reactions at the electrode/electrolyte interface. In particular, the electrode material with high specific capacitance, wide range of operating potential, low synthesis cost and its availability on the earth are highly desirable to fabricate a supercapacitor. Ferrites with mixed oxidation states have proved as promising electrodes in supercapacitors. In this chapter, we summarize the different synthesis methods of ferrites based nanocomposites and their electrochemical properties for supercapacitor application.

Sign in / Sign up

Export Citation Format

Share Document