A high voltage aqueous proton battery using an optimized operation of a MoO<sub>3</sub> positive electrode

Ikezawa, Atsunori; Koyama, Yukinori; Nishizawa, Tadaaki; Arai, Hajime

doi:10.1039/d2ta08581j

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…Aqueous rechargeable devices have attracted substantial attention due to their superior advantages, such as high safety, convenient operation, ideal energy and power density, low cost, and so on. − Among them, supercapacitors have been used as a new type of green energy storage device in many areas, for example, backup power systems, portable electronic devices, hybrid electric vehicles, and so on. Nevertheless, due to the electrochemical energy storage process mainly occurring on the surface of the electrode, the energy density of supercapacitors is generally inferior to the batteries, which also becomes the primary challenge for the supercapacitors .…”

Section: Introductionmentioning

confidence: 99%

Designed Synthesis and Electrochemical Performance Regulation of the Hierarchical Hollow Structure Cu₂S/Cu₇S₄/NC Anode for Hybrid Supercapacitors

Yin,

Zhang,

Liu

et al. 2024

ACS Omega

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Copper-based compounds have attracted increasing attention as electrode materials for rechargeable devices, but their poor conductivity and insufficient stability inhibit their further development. Herein, an effective method has been proposed to improve the electrochemical properties of the copper-based electrodes by coating carbon materials and generating unique micro/nanostructures. The prepared Cu2S/Cu7S4/NC with hierarchical hollow structure possesses excellent electrochemical performance, attributing to the composition and structure optimization. The superior charge storage performance has been assessed by theoretical and experimental research. Specifically, the Cu2S/Cu7S4/NC exhibits remarkably higher electrical conductivity and lower adsorption-free energy for O* and OH* than those of Cu2O. Moreover, the Cu2S/Cu7S4/NC delivers a high specific capacitance of 1261.3 F·g–1 at the current density of 1 A·g–1 and also has great rate performance at higher current densities, which are much better than those of the Cu2O nanocubes. In addition, the assembled hybrid supercapacitor using Cu2S/Cu7S4/NC as the anode exhibits great energy density, power density, and cycling stability. This study has proposed a novel and feasible method for the synthesis of high-performance copper-based electrodes and their electrochemical performance regulation, which is of great significance for the advancement of high-quality electrode materials and rechargeable devices.

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Section: Introductionmentioning

confidence: 99%

Designed Synthesis and Electrochemical Performance Regulation of the Hierarchical Hollow Structure Cu₂S/Cu₇S₄/NC Anode for Hybrid Supercapacitors

Yin,

Zhang,

Liu

et al. 2024

ACS Omega

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“…Researchers are committed to developing new electrode materials for aqueous proton batteries. At present, organic materials such as carbonyl compounds, [27,28] anhydride compounds, [29,30] ketones compounds [28] and inorganic materials such as MoO 3 , [31][32][33][34] WO 3 [35][36][37] and Prussian blue analog [38] have been reported as feasible electrode materials choices for aqueous proton batteries. Among them, metal oxides with layered structures have large interlayer spacing, multiple valences and proper coordination environments which can bring excellent electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

Polyaniline/Tungsten Trioxide Organic‐Inorganic Hybrid Anode for Aqueous Proton Batteries

Tong,

Wei,

Song

et al. 2024

Chemistry A European J

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Aqueous proton batteries have received increasing attention due to their outstanding rate performance, stability and high capacity. However, the selection of anode materials in strongly acidic electrolytes poses a challenge in achieving high‐performance aqueous proton batteries. This study optimized the proton reaction kinetics of layered metal oxide WO3 by introducing interlayer structured water and coating polyaniline on its surface to prepare organic‐inorganic hybrid material (WO3·2H2O@PANI). We constructed an aqueous proton battery with WO3·2H2O@PANI anode and MnO2@GF cathode. After 1500 cycles at a current density of 10 A g‐1, the capacity retention rate can still reach 80.2%. These results can inspire the development of new aqueous proton batteries.

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“…Nevertheless, the fast ionic conduction based on the proton-specific Grötthuss mechanism is expected to provide high power and relatively large charge/discharge capacities comparable to those of electric double-layer capacitors. In the previous studies on the negative electrode materials, active materials such as MoO 3 , − WO 3 (· n H 2 O), − H 2 Ti 3 O 7 , and anatase TiO 2 − have been reported. As mentioned above, when handling protons in aqueous electrolytes, the electrochemical windows govern the operating voltages and tend to be narrow.…”

Section: Introductionmentioning

confidence: 99%

Protonation/Deprotonation of Rutile TiO₂ in Acid Aqueous Electrolytes

Shimizu,

Nishida,

Kikuchi

et al. 2023

J. Phys. Chem. C

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The diversity of carrier ions in electrochemical devices has attracted much attention with regard to the use of protons. If the fast proton conduction originating from the Groẗthuss mechanism can be utilized, the development of water-based rechargeable batteries that combine safety and rapid charge−discharge performance is expected. However, the narrow potential window of acid-based aqueous solutions limits the operation of active materials. In this work, the effect of the crystal structure on electrochemical protonation/deprotonation of TiO 2 as a negative electrode material was systematically investigated using slurrybased composite electrodes. In the galvanostatic charge−discharge tests using a buffer electrolyte consisting of 1 M citric acid and 1 M trisodium citrate, the protonation of the rutile TiO 2 proceeded at a higher potential than those of the anatase and brookite TiO 2 , resulting in reversible capacities of 102 and 87 mA h g −1 at the first cycle and 50th cycle, respectively, due to the decrease in irreversible hydrogen evolution. X-ray diffraction revealed that the protonation occurred inside the bulk, although the changes in the a and c axes during protonation/deprotonation were much smaller than those of Li + and Na + insertion. On the other hand, in particle sizes larger than 100 nm, the hydrogen evolution was dominant and the deprotonation was less in the anatase TiO 2 , and neither charging/discharging nor even the hydrogen generation occurred in the larger rutile TiO 2 . This is presumably due to the slow proton diffusion in the solid phases, which stalls the proton storage and induces the reduction of protons at the electrode−electrolyte interface. These obstacles should be overcome by nanosizing the particles and optimizing electrolyte compositions.

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A high voltage aqueous proton battery using an optimized operation of a MoO₃ positive electrode

Abstract: Aqueous proton batteries have attracted increasing attention owing to their potential of high safety standard, high rate capability, and long cyclability. While some inorganic negative electrode materials for proton batteries...

Cited by 8 publications

References 23 publications

Designed Synthesis and Electrochemical Performance Regulation of the Hierarchical Hollow Structure Cu₂S/Cu₇S₄/NC Anode for Hybrid Supercapacitors

Designed Synthesis and Electrochemical Performance Regulation of the Hierarchical Hollow Structure Cu₂S/Cu₇S₄/NC Anode for Hybrid Supercapacitors

Polyaniline/Tungsten Trioxide Organic‐Inorganic Hybrid Anode for Aqueous Proton Batteries

Protonation/Deprotonation of Rutile TiO₂ in Acid Aqueous Electrolytes

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A high voltage aqueous proton battery using an optimized operation of a MoO3 positive electrode

Abstract: Aqueous proton batteries have attracted increasing attention owing to their potential of high safety standard, high rate capability, and long cyclability. While some inorganic negative electrode materials for proton batteries...

Cited by 8 publications

References 23 publications

Designed Synthesis and Electrochemical Performance Regulation of the Hierarchical Hollow Structure Cu2S/Cu7S4/NC Anode for Hybrid Supercapacitors

Designed Synthesis and Electrochemical Performance Regulation of the Hierarchical Hollow Structure Cu2S/Cu7S4/NC Anode for Hybrid Supercapacitors

Polyaniline/Tungsten Trioxide Organic‐Inorganic Hybrid Anode for Aqueous Proton Batteries

Protonation/Deprotonation of Rutile TiO2 in Acid Aqueous Electrolytes

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A high voltage aqueous proton battery using an optimized operation of a MoO₃ positive electrode

Designed Synthesis and Electrochemical Performance Regulation of the Hierarchical Hollow Structure Cu₂S/Cu₇S₄/NC Anode for Hybrid Supercapacitors

Designed Synthesis and Electrochemical Performance Regulation of the Hierarchical Hollow Structure Cu₂S/Cu₇S₄/NC Anode for Hybrid Supercapacitors

Protonation/Deprotonation of Rutile TiO₂ in Acid Aqueous Electrolytes