High-temperature supercapacitor with a proton-conducting metal pyrophosphate electrolyte

Hibino, Takashi; Kobayashi, Kazuyo; Nagao, Masahiro; Kawasaki, Shigeo

doi:10.1038/srep07903

Cited by 76 publications

(50 citation statements)

References 31 publications

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“…An additional contributing factor may have been an increase in the mass-transfer resistance of the anode with the current density, due to the restricted diffusion of ionomer ions in the narrow micropores of the MPC. [46][47][48] This is supported by the finding that the electrical capacity was almost independent of the quantity of MPC in the anode (Fig. S10), indicating a highly reversible charge-transfer reaction at the interface.…”

Section: Resultssupporting

confidence: 69%

Design of a Rechargeable Fuel-Cell Battery with Enhanced Performance and Cyclability

Hibino

Kobayashi

Nagao

et al. 2016

J. Electrochem. Soc.

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Electrochemical devices integrating a fuel cell with a hydrogen storage medium are able to function as secondary batteries. Batteries incorporating a partially oxygenated carbon anode with a RuO 2 /C cathode exhibit excellent reversibility, but their performance is not yet sufficient for secondary battery applications. This is due to excessive oxygenation of the anode, degradation of the cathode and the excess weight of the electrolyte membrane. In the present work, we addressed these challenges through various improvements in the design of a rechargeable proton-exchange membrane battery. These included coating the surface of a significantly oxygenated carbon anode (O/C atomic ratio 0.131) with carbon black nanoparticles, nanocrystallization of a carbon-free RuO 2 cathode (avg. crystallite size 1.1 nm) and the synthesis of an inorganic-organic composite electrolyte membrane. As a result of these optimizations, coulombic efficiencies of over 95% were achieved during charge/discharge over the voltage range of 0.0-1.5 V at 75 • C. The resulting device exhibited an initial capacity of 330 mAh g −1 and was stable over 300 cycles, with maximum energy and power densities of Hydrogen is a promising medium for the storage and supply of electricity through water-electrolysis/fuel-cell operation.1,2 The primary application of hydrogen in this context would be to store surplus power when the quantity of electricity produced by natural energy sources exceeds that required by a consumer.3-5 Rechargeable fuel cells capable of operating alternately in electrolyzer and fuel cell modes are recognized as the optimum systems because they are smaller and more compact than conventional systems based on isolated water electrolyzer and fuel cell units.6-8 The key technology necessary for such devices is hydrogen storage, which is currently accomplished via liquefaction and compression of the gas or by the physical or chemical adsorption of hydrogen atoms or molecules in/on materials such as metal or organic chemical hydrides.9,10 However, an energy input is required for these processes that in turn increases the overall cost. Furthermore, the hydrogen tanks and lines employed in such systems negatively impact their volumetric energy density.To mitigate these problems, rechargeable fuel-cell batteries (RFCBs) containing a hydrogen storage medium have been proposed. [11][12][13] During the operation of such batteries, hydrogen production, storage, supply and utilization processes must be conducted at the anode under the standard operational conditions of the cell, such as between room temperature and 80• C and at ambient pressure. In this context, oxygen-functionalized microporous carbons (MPCs) are promising hydrogen storage media, due to their excellent reversibility. 13 The redox pair between carbonyl (C=O) and phenol (C-OH) groups is one of the most important hydrogen carrier sites in such carbon anodes. The origin of this redox reaction is ascribed to the following equilibrium reaction between the two functional groups.This reaction...

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Section: Resultssupporting

confidence: 69%

Design of a Rechargeable Fuel-Cell Battery with Enhanced Performance and Cyclability

Hibino

Kobayashi

Nagao

et al. 2016

J. Electrochem. Soc.

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“…Energy storage and transition systems, including Li//air12, Mg/air3, metal (V, Sn, Ni)//air4, Zn//air5, Tin/Air6, aqueous rechargeable lithium/sodium batteries178910, redox flow batteries11, Li//I 2 12, Li//sulphur13, and Li//Se14, Fuel cell1516, capacitor1718, have been developed rapidly to satisfy the various energy demands of electronics and electric automobiles. Recently, based on aqueous rechargeable battery -rechargeable hybrid aqueous batteries (ReHABs)- have been widely developed6789 on account of their safety, environmental friendliness, and low cost.…”

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confidence: 99%

Novel Rechargeable M3V2(PO4)3//Zinc (M = Li, Na) Hybrid Aqueous Batteries with Excellent Cycling Performance

Zhao

Cheng

et al. 2016

Sci Rep

117

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A rechargeable hybrid aqueous battery (ReHAB) containing NASICON-type M3V2(PO4)3 (M = Li, Na) as the cathodes and Zinc metal as the anode, working in Li2SO4-ZnSO4 aqueous electrolyte, has been studied. Both of Li3V2(PO4)3 and Na3V2(PO4)3 cathodes can be reversibly charge/discharge with the initial discharge capacity of 128 mAh g−1 and 96 mAh g−1 at 0.2C, respectively, with high up to 84% of capacity retention ratio after 200 cycles. The electrochemical assisted ex-XRD confirm that Li3V2(PO4)3 and Na3V2(PO4)3 are relative stable in aqueous electrolyte, and Na3V2(PO4)3 showed more complicated electrochemical mechanism due to the co-insertion of Li+ and Na+. The effect of pH of aqueous electrolyte and the dendrite of Zn on the cycling performance of as designed MVP/Zn ReHABs were investigated, and weak acidic aqueous electrolyte with pH around 4.0–4.5 was optimized. The float current test confirmed that the designed batteries are stable in aqueous electrolytes. The MVP//Zn ReHABs could be a potential candidate for future rechargeable aqueous battery due to their high safety, fast dynamic speed and adaptable electrochemical window. Moreover, this hybrid battery broadens the scope of battery material research from single-ion-involving to double-ions -involving rechargeable batteries.

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“…S1), which means that neither electrons nor holes are formed in this material under polarization. 28 This also suggests that the Zr 1-x Y x P 2 O 7 film blocks electron flow beyond the BZY_ZnO_H 3 PO 4 electrolyte, consequently increasing the current efficiency for PM oxidation. Because of the high withstanding voltage of BZY_ZnO_H 3 PO 4 , this material was the focus of subsequent experiments.…”

Section: Resultsmentioning

confidence: 99%

A Sensitive and Self-Regenerable Particulate Matter Sensor with a H₃PO₄-Modified BaZr_0.8Y_0.2O_3-δElectrolyte and an IrO₂-Catalyzed Sensing Electrode

Oogushi

Nakashima

et al. 2016

J. Electrochem. Soc.

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There have been many attempts to develop solid-state sensor devices for detecting particulate matter (PM) in diesel exhaust; however, in most of these, the accumulated PM must be burned intermittently to allow subsequent sensing cycles. Here, we report a selfregenerable PM sensor using a proton conductive solid electrolyte and an active working electrode for PM oxidation. The withstanding voltage capability of BaZr 0.8 Y 0.2 O 3-δ was greatly improved by the growth of a dense Zr 1-x Y x P 2 O 7 film on the electrolyte surface. The reaction of PM with active oxygen under anodic polarization was further enhanced by the addition of IrO 2 to the working electrode. As a result of these combined modifications, when the working electrode was anodically polarized, PM was oxidized to CO 2 according to a four-electron reaction (C + 2H 2 O → CO 2 + 4H + + 4e -) while remaining below the self-ignition temperature. This amperometric sensor successfully produced a current signal corresponding to the quantity of PM in a gas stream at an operating temperature of 300 • C. These results demonstrate that the sensor can carry out continuous monitoring of PM concentrations while self-regenerating.

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High-temperature supercapacitor with a proton-conducting metal pyrophosphate electrolyte

Cited by 76 publications

References 31 publications

Design of a Rechargeable Fuel-Cell Battery with Enhanced Performance and Cyclability

Design of a Rechargeable Fuel-Cell Battery with Enhanced Performance and Cyclability

Novel Rechargeable M3V2(PO4)3//Zinc (M = Li, Na) Hybrid Aqueous Batteries with Excellent Cycling Performance

A Sensitive and Self-Regenerable Particulate Matter Sensor with a H₃PO₄-Modified BaZr_0.8Y_0.2O_3-δElectrolyte and an IrO₂-Catalyzed Sensing Electrode

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High-temperature supercapacitor with a proton-conducting metal pyrophosphate electrolyte

Cited by 76 publications

References 31 publications

Design of a Rechargeable Fuel-Cell Battery with Enhanced Performance and Cyclability

Design of a Rechargeable Fuel-Cell Battery with Enhanced Performance and Cyclability

Novel Rechargeable M3V2(PO4)3//Zinc (M = Li, Na) Hybrid Aqueous Batteries with Excellent Cycling Performance

A Sensitive and Self-Regenerable Particulate Matter Sensor with a H3PO4-Modified BaZr0.8Y0.2O3-δElectrolyte and an IrO2-Catalyzed Sensing Electrode

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A Sensitive and Self-Regenerable Particulate Matter Sensor with a H₃PO₄-Modified BaZr_0.8Y_0.2O_3-δElectrolyte and an IrO₂-Catalyzed Sensing Electrode