A robust carbon tolerant anode for solid oxide fuel cells

Ling, Yihan; Wang, Zhenbin; Wang, Zhiquan; Peng, Ranran; Lin, Bin; Yu, Weili; Isimjan, Tayirjan Taylor; Lu, Yalin

doi:10.1007/s40843-015-0033-6

Cited by 20 publications

(9 citation statements)

References 46 publications

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“…Unfortunately, the obtained electrochemical performances remain inferior compared with the Ni-YSZ composite [17]. Some studies have shown that the performance can be improved by introducing metal nanoparticles on the perovskite surface through various deposition techniques such as vapor deposition, infiltration, and exsolution [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode

Singh

Zhuang

et al. 2020

Sci. China Mater.

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The reversible solid oxide cell (RSOC) is an attractive technology to mutually convert power and chemicals at elevated temperatures. However, its development has been hindered mainly due to the absence of a highly active and durable fuel electrode. Here, we report a phase-transformed CoFe-Sr 3 Fe 1.25 Mo 0.75 O 7−δ (CoFe-SFM) fuel electrode consisting of CoFe nanoparticles and Ruddlesden-Popper-layered Sr 3 Fe 1.25 Mo 0.75 O 7−δ (SFM) from a Sr 2 Fe 7/6 Mo 0.5 Co 1/3 O 6−δ (SFMCo) perovskite oxide after annealing in hydrogen and apply it to reversible CO/CO 2 conversion in RSOC. The CoFe-SFM fuel electrode shows improved catalytic activity by accelerating oxygen diffusion and surface kinetics towards the CO/CO 2 conversion as demonstrated by the distribution of relaxation time (DRT) study and equivalent circuit model fitting analysis. Furthermore, an electrolyte-supported single cell is evaluated in the 2:1 CO-CO 2 atmosphere at 800°C, which shows a peak power density of 259 mW cm −2 for CO oxidation and a current density of −0.453 A cm −2 at 1.3 V for CO 2 reduction, which correspond to 3.079 and 3.155 mL min −1 cm −2 for the CO and CO 2 conversion rates, respectively. More importantly, the reversible conversion is successfully demonstrated over 20 cyclic electrolysis and fuel cell switching test modes at 1.3 and 0.6 V. This work provides a useful guideline for designing a fuel electrode through a surface/interface exsolution process for RSOC towards efficient CO-CO 2 reversible conversion.

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Section: Introductionmentioning

confidence: 99%

Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode

Singh

Zhuang

et al. 2020

Sci. China Mater.

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“…Recently, Shinde et al [18] found that the Ni/TiO 2 catalyst had a high resistance to coke formation even at a low steam/carbon ratio, much better than the traditional Ni/ZrO 2 catalysts (about 59% C selectivity) [19]. We also found that single cells demonstrated great power density and stability in methane and propane atmospheres when applying a Ni-TiO 2 catalytic layer in-situ formed via Ni-TiO 3 reduction [20,21]. Compared with the traditional Ni-YSZ and Ni-SDC catalysts that generally facilitate the coke forming reaction, the great carbon tolerance of the Ni/TiO 2 -based catalysts should result from the special properties of TiO 2 or the Ni/TiO 2 interface.…”

Section: Introductionmentioning

confidence: 56%

First principles study on methane reforming over Ni/TiO2(110) surface in solid oxide fuel cells under dry and wet atmospheres

et al. 2019

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Understanding the carbon-tolerant mechanisms from a microscopic view is of special importance to develop proper anodes for solid oxide fuel cells. In this work, we employed density-functional theory calculations to study the CH 4 reaction mechanism over a Ni/TiO 2 nanostructure, which experimentally demonstrated good carbon tolerance. Six potential pathways for methane reforming reactions were studied over the Ni/TiO 2 (110) surface under both dry and wet atmospheres, and the main concerns were focused on the impact of TiO 2 and Ni/TiO 2 interface on CO/H 2 formation. Our calculations suggest that the reaction between carbon and the interfacial lattice oxygen to form CO* is the dominant pathway for CH 4 reforming under both dry and wet atmospheres, and intervention of steam directly to oxidize C* with its dissociated OH* group is less favorable in energy than that to wipe off oxygen vacancy to get ready for next C* oxidation. In all investigated paths, desorption of CO* is one of the most difficult steps. Fortunately, CO* desorption can be greatly promoted by the large heat released from the previous CO* formation process under wet atmosphere. H 2 O adsorption and dissociation over the TiO 2 surface are found to be much easier than those over Ni, yttria stabilized zirconia (YSZ) and CeO 2 , which should be the key reason for the greatly depressed carbon deposition over Ni-TiO 2 particles than traditional YSZ-Ni and CeO 2 -Ni anode. Our study presents the detailed CO* formation mechanism in CH 4 reforming process over the Ni/TiO 2 surface, which will benefit future research for exploring new carbon-tolerant solid oxide fuel cell anodes.

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“…Candidate mechanisms include the reforming activity of Al- and Ti-containing secondary phases that will oxidize carbon before observable amounts accumulate. This mechanism is based on numerous studies that report the reforming activity of both Al 2 O 3 and TiO 2 , ,,,,− , two compounds known to form when ALT-enhanced anodes are reduced. , When Ni reacts with ALT, the main secondary phase formed is NiAl 2 O 4 . However, small amounts of Ni can also react with TiO 2 to create NiTiO 3 .…”

Section: Results and Discussionmentioning

confidence: 99%

Mitigating Carbon Formation with Al₂TiO₅-Enhanced Solid Oxide Fuel Cell Anodes

Welander¹,

Zachariasen²,

Sofie³

et al. 2019

J. Phys. Chem. C

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Spectroscopic and electrochemical techniques were used to examine the benefits of adding small amounts of aluminum titanate (Al2TiO5 or ALT) to standard NiO–yttria-stabilized zirconia (YSZ)-based solid oxide fuel cell anodes operating with methane at 800 °C. Combining small amounts (4% by mass) of ALT with NiO–YSZ leads to the formation of secondary phases that improve anode carbon tolerance via multiple reaction mechanisms. Raman data show that carbon forms on both ALT-doped and undoped anodes at open-circuit voltage and with applied bias as evidenced by the vibrational band of highly ordered graphite at 1560 cm–1. However, ALT-doped anodes limited the amount of carbon that forms on both the surface and within the bulk, resulting in improved performance for up to 12 h of exposure to CH4. Results show that ALT-enhanced anodes accumulate ∼25% less carbon on the surface under open-circuit conditions and that increasing polarizations to 50% of the maximum current and beyond results in no observable carbon accumulation. These observations are used to deduce possible mechanisms that describe how secondary phases suppress carbon accumulation.

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A robust carbon tolerant anode for solid oxide fuel cells

Cited by 20 publications

References 46 publications

Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode

Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode

First principles study on methane reforming over Ni/TiO2(110) surface in solid oxide fuel cells under dry and wet atmospheres

Mitigating Carbon Formation with Al₂TiO₅-Enhanced Solid Oxide Fuel Cell Anodes

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A robust carbon tolerant anode for solid oxide fuel cells

Cited by 20 publications

References 46 publications

Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode

Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode

First principles study on methane reforming over Ni/TiO2(110) surface in solid oxide fuel cells under dry and wet atmospheres

Mitigating Carbon Formation with Al2TiO5-Enhanced Solid Oxide Fuel Cell Anodes

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Mitigating Carbon Formation with Al₂TiO₅-Enhanced Solid Oxide Fuel Cell Anodes