The relationship between equilibrium potential during discharge and hydrogen concentration in a metal hydride electrode

Feng, Feng; Ping, Xinyi; Zhou, Ziqiang; Geng, Mingming; Han, Jianwen; Northwood, Derek O.

doi:10.1016/s0360-3199(97)00068-2

Cited by 17 publications

(4 citation statements)

References 12 publications

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“…Therefore, it is side by side through comparing the stabilized open-circuit voltage (Voc) versus state of charge (SOC) curves in the electrochemical PCT (EPCT) and gaseous phase PCT curves. [6] Noble metals like Pd and Pt [7] The EPCT method is not a new idea and had been applied in a number of MH alloy studies, including studies on AB5 [8][9][10][11], AB2-based multiphase alloys [12][13][14], Ce-Mn-Al-Ni [15], Ce-Mg-Ni-Ti-F [16], carbon nanofiber [17], and Mg2Ni [18]. In EPCT, the stabilized Voc is converted to equilibrium pressure via the Nernst Equation (1) [19]:…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Open-Circuit Voltage and Pressure-Concentration-Temperature Isotherm Comparison for Metal Hydride Alloys

Mosavati

Kim

Meng³

et al. 2016

Batteries

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In this study we compared the electrochemical pressure-concentration-temperature (EPCT) method with the gaseous phase pressure-concentration-temperature (PCT) method and demonstrated the differences between the two. Experimentally, this was done by electrochemically charging/discharging the electrodes of four different metal hydride (MH) alloys. The results indicate that in the PCT curve is flatter with a smaller hysteresis and a higher storage capacity compared to the EPCT curve. Moreover, while the PCT curves (up to around one third of the hydrogen storage capacity) reside in between the charge and discharge EPCT curves, the rest of the PCT curves are below the EPCT curves. Finally, we demonstrated a new calibration method based on the inflection points observed in the EPCT isotherms of a physical mixture of more than one alloy. This turning point can be used to find a preset calibration point to determine the state-of-charge.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Open-Circuit Voltage and Pressure-Concentration-Temperature Isotherm Comparison for Metal Hydride Alloys

Mosavati

Kim

Meng³

et al. 2016

Batteries

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“…Note that a comparable approach, also based on the work of Yang et al, was reported in Ref. [49], where the authors assumed that the electrode potential during charging equals the equilibrium potential. In contrast, we account for the irreversibilities (overpotentials) which allows to infer the "real"equilibrium potential.…”

Section: Derivation Of An Electrolytic (De-)hydrogenation Modelmentioning

confidence: 93%

Electrochemical investigation and modelling of LaNi4.77Al0.23 thin-films sputtered on glass wafers

Khazaeli

Falahati

Barz

2019

Journal of Alloys and Compounds

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In the present work, we report on the microfabrication of metal hydride thin-film electrodes which can be utilized for rechargeable microbatteries or sensor applications. A multi-layer deposition technique is developed based on physical vapor deposition to fabricate the thin-film electrodes on a glass substrate. The morphology and the structure of the thin-film electrodes are studied by using Field Emission Scanning Electron Microscopy coupled with an Energy Dispersive Spectroscopy module. The surface composition of the thin-film electrodes are determined using X-ray Photoelectron Spectroscopy. Cyclic Voltammetry and galvanostatic charge-discharge measurements are performed to obtain insights into the electrochemical performance of the electrodes. Finally, a semi-empirical model is derived which allows for the determination of the equilibrium potential of the electrode as a function of its hydrogen content.

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“…The equilibrium discharge process of a MHE is measured under a small galvanostatic discharge current . The hydrogen desorption in a MHE occurs in three consecutive steps (Figure ).…”

Section: Methodsmentioning

confidence: 99%

Analysis of electrochemical hydrogen absorption capacity for Pd-Ni nanoparticle incorporated MmNi5−XMX-based metal hydride

Rivera

Gamboa

Sebastian

2011

Int. J. Energy Res.

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SUMMARY In this work are present the results obtained from the electrochemical characterization of a metal hydride type MmNi5−XMX impregnated with palladium, palladium–nickel and nickel nanoparticles as catalytic precursors for hydrogen absorption. The hydrogen absorption was investigated in the charge/discharge mechanism of a metal hydride via electrochemical process. The complete study involved the analysis of linear and anodic polarization, charge/discharge cycles, the application of an electrochemical model and electrochemical impedance spectroscopy to investigate the amount of hydrogen absorbed as a function of the catalytic precursors. The use of Pd nanoparticles showed the best results as catalytic precursor to absorb more hydrogen than other precursor systems. Copyright © 2011 John Wiley & Sons, Ltd.

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The relationship between equilibrium potential during discharge and hydrogen concentration in a metal hydride electrode

Cited by 17 publications

References 12 publications

Electrochemical Open-Circuit Voltage and Pressure-Concentration-Temperature Isotherm Comparison for Metal Hydride Alloys

Electrochemical Open-Circuit Voltage and Pressure-Concentration-Temperature Isotherm Comparison for Metal Hydride Alloys

Electrochemical investigation and modelling of LaNi4.77Al0.23 thin-films sputtered on glass wafers

Analysis of electrochemical hydrogen absorption capacity for Pd-Ni nanoparticle incorporated MmNi5−XMX-based metal hydride

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