Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

Irvine, John T. S.; Neagu, Dragoş; Verbraeken, Maarten C.; Chatzichristodoulou, Christodoulos; Graves, Christopher R.; Mogensen, Mogens Bjerg

doi:10.1038/nenergy.2015.14

Cited by 606 publications

(471 citation statements)

References 101 publications

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“…Cells that did not contain nickel and had therefore not coked, were also exposed to such a treatment. The two redox cycles at 650 ℃ and 750 ℃ did not affect R s and actually reduced R p by 18 % for the CGO-SFM-CZC type cell, an activation phenomenon not uncommon for oxide electrodes (40). The cells thus indicate stability towards redox cycles.…”

Section: Electrochemical Testingmentioning

confidence: 80%

Carbon and Redox Tolerant Infiltrated Oxide Fuel-Electrodes for Solid Oxide Cells

et al. 2016

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To solve issues of coking and redox instability related to the presence of nickel in typical fuel electrodes in solid oxide cells, Gd-doped CeO 2 (CGO) electrodes were studied using symmetric cells. These electrodes showed high electro-catalytic activity, but low electronic conductivity. When infiltrated with Sr 0.99 Fe 0.75 Mo 0.25 O 3-δ (SFM), the electronic conductivity was enhanced. However, polarization resistance of the cells increased, suggesting that the infiltrated material is less electro-catalytically active and was partly blocking the CGO surface reaction sites. The activity could be regained by infiltrating nano-sized CGO or NiCGO on top of SFM, while still sustaining the high electronic conductivity. Ohmic resistance of the electrodes was thus practically eliminated and performance comparable to, or better than, state-of-the-art fuel electrodes was achieved. The Ni containing cells were damaged by carbon deposition in a CO/CO 2 -atmosphere, while none of the non-nickel cells catalyzed carbon. Stability towards redox cycles was also proven.

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Section: Electrochemical Testingmentioning

confidence: 80%

Carbon and Redox Tolerant Infiltrated Oxide Fuel-Electrodes for Solid Oxide Cells

et al. 2016

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“…4,5 We have shown that the stability of DSSC devices is principally governed by the properties of the solid/liquid interface(s), in common with many electrochemical displays. [6][7][8] Our results highlighted that a major degradation pathway stems from the unstable character of the TiO2/MPN-based electrolyte interface where the TiO2 surface exposed between adsorbed dye molecules plays a pivotal role in the degradation of the electrolyte and concentration/depletion of its components. 8 These processes result in the growth of a solid polymeric layer on the surface of the mesoporous photo-anode network which we refer to as a solid electrolyte interphase (SEI), analogous to the terminology introduced by Peled and widely used in the study of battery systems.…”

Section: Introductionmentioning

confidence: 82%

Consequences of Solid Electrolyte Interphase (SEI) Formation upon Aging on Charge-Transfer Processes in Dye-Sensitized Solar Cells

et al. 2016

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Solid electrolyte interphase (SEI) layers form on sensitized-TiO2 photo-anodes and platinum counter-electrodes when dye-sensitized solar cells (DSSCs) are subjected to an accelerated ageing protocol (e.g. heating at 85 °C in the dark for 500 hours). To understand how this will impact the device operation, electrochemical impedance spectroscopy study showed that the SEI induces an additional electron transfer process from the TiO2 to the electrolyte. This is materialized by the onset of a new charge transfer semi-circle at higher frequencies, predominantly visible under bias voltage similar and above open circuit voltage. Our results emphasized on the detrimental role of the SEI formation on device performance and lifetime.Additionally, ns-transient absorption spectroscopy shows that SEI formation reduces the rate oxidised dye regeneration. We also show that a proportion of the photogenerated holes on the dyes are transferred to the SEI itself. Prolonged ageing duration leads to the electrode's mesoporosity network entirely clogged by the SEI; thus impeding efficient transport of the electrolyte redox couple, also responsible for a further decline in photovoltaic performances.2

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“…Electrochemical energy storage (EES) systems including batteries, electrochemical capacitors (ECs), and fuel cells are critically needed to store these transient and unstable energies and release them in a stable manner [6][7][8][9][10]. As a key member of EES, ECs have attracted tremendous attention due to their advantages of high power density, exceptional long cycling life, and reliability [11][12][13][14].…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Significantly enhanced energy density of magnetite/polypyrrole nanocomposite capacitors at high rates by low magnetic fields

Wei

Guo

et al. 2017

Adv Compos Hybrid Mater

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One great challenge existing in electrochemical capacitors (ECs) is to achieve high energy densities at high rates. Currently, most research efforts are focused on development of new electrode materials or modification of the microstructure of traditional electrode materials. Herein, we propose a new strategy for significant enhancement of the energy density of ECs at high rates, in which an external magnetic field is exerted. Results indicate that exertion of a magnetic field can increase the energy density of nanocomposite capacitors significantly. In particular, the energy densities of the magnetite/ polypyrrole nanocomposite capacitors containing different content magnetite nanoparticles achieve an increase of more than 10 times at a high current density of 10 A/g, compared to the counterparts without a magnetic field. The possible mechanism is that the magnetic field induces electrolyte ion movement enhancement and charge transfer resistance reduction, which remarkably cause the increase of capacitance and energy density. This work provides an innovative strategy to significantly enhance the rate capabilities of current ECs by a simple physical process rather than chemical process.

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Evolution of the electrochemical interface in high-temperature fuel cells and electrolysers

Cited by 606 publications

References 101 publications

Carbon and Redox Tolerant Infiltrated Oxide Fuel-Electrodes for Solid Oxide Cells

Carbon and Redox Tolerant Infiltrated Oxide Fuel-Electrodes for Solid Oxide Cells

Consequences of Solid Electrolyte Interphase (SEI) Formation upon Aging on Charge-Transfer Processes in Dye-Sensitized Solar Cells

Significantly enhanced energy density of magnetite/polypyrrole nanocomposite capacitors at high rates by low magnetic fields

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