ChemInform Abstract: Enhanced Sulfur and Coking Tolerance of a Mixed Ion Conductor for SOFCs: BaZr0.1Ce0.7Y0.2‐xYbx O3‐δ.

Yang, Lei; Wang, Shizhong; Blinn, Kevin; Liu, Mingfei; Liu, Ze; Cheng, Zhe; Liu, Meilin

doi:10.1002/chin.200950009

Cited by 13 publications

(14 citation statements)

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“…2 One important reaction is the oxygen reduction reaction (ORR) 2À on the surface of an air electrode, which involves a number of surface processes, including adsorption of oxygen molecules on adsorption sites, dissociation of oxygen molecules to monoatomic oxygen species, surface diffusion of oxygen species to active sites for reduction (charge transfer), partial reduction of oxygen species, and combination of oxygen species with an oxygen vacancy. [3][4][5] However, the kinetics of ORR are notoriously sluggish, limited by one or more of these steps. Therefore, considerable efforts have been devoted to developing high-performance electrodes or catalysts with high electrocatalytic activity for ORR.…”

Section: Introductionmentioning

confidence: 99%

A Highly Efficient Multi-phase Catalyst Dramatically Enhances the Rate of Oxygen Reduction

Chen

Choi

Yoo

et al. 2018

Joule

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273

174

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A multi-phase catalyst coating, composed of a thin-film PrBa 0.8 Ca 0.2 Co 2 O 5+d (PBCC) decorated with nanoparticles (NPs) of BaCoO 3Àx and PrCoO 3Àx , has dramatically enhanced the rate of oxygen reduction reaction. Oxygen molecules adsorb and dissociate rapidly on the NPs due to enriched surface oxygen vacancies, while the dissociated oxygen species transport quickly through the PBCC film into the cathode.

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Section: Introductionmentioning

confidence: 99%

A Highly Efficient Multi-phase Catalyst Dramatically Enhances the Rate of Oxygen Reduction

Chen

Choi

Yoo

et al. 2018

Joule

Self Cite

273

174

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“…Boudouard deposition is also a concern in fuel cell mode, albeit with much less severity than in electrolysis due to the oxidizing environment 14,15 . Advanced carbon-tolerant fuel cell electrodes almost universally include CeO2-δ (ceria, substituted with trivalent cations such as Sm and Gd), or other oxygen-storing oxides, as an active component [16][17][18][19][20][21][22] . It was recently proposed that carbon tolerance on ceria in fuel cells could also extend to electrolysis cells 10 .…”

mentioning

confidence: 99%

Selective high-temperature CO2 electrolysis enabled by oxidized carbon intermediates

et al. 2019

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High-temperature CO2 electrolyzers offer exceptionally efficient storage of renewable electricity in the form of CO and other chemical fuels, but conventional electrodes catalyze destructive carbon deposition. Ceria catalysts are known carbon inhibitors for fuel cell (oxidation) reactions, however for the more severe electrolysis (reduction) conditions, catalyst design strategies remain unclear. Here we establish the inhibition mechanism on ceria and show selective CO2 to CO conversion well beyond the thermodynamic carbon deposition threshold. Operando X-ray photoelectron spectroscopy during CO2 electrolysis -using thin-film model electrodes consisting of samarium-doped ceria, nickel, and/or yttria-stabilized zirconia -together with density functional theory modeling reveal the crucial role of oxidized carbon intermediates in preventing carbon buildup. Using these insights, we demonstrate stable electrochemical CO2 reduction with a scaledup 16 cm 2 ceria-based solid oxide cell under conditions that rapidly destroy a nickel-based cell, leading to substantially improved device lifetime.Main Text: CO2 utilization is expected to play a key role in achieving a carbon-neutral sustainable energy economy. Electrochemical CO2 reduction, in particular, is a promising way to store intermittent electricity derived from solar and wind in the form of chemicals, such as synthetic hydrocarbons compatible with the existing energy infrastructure, and is therefore an essential technology in decarbonization strategies [1][2][3][4] . Currently, the most efficient CO2 electrolysis technology is the elevated-temperature solid oxide electrochemical cell (SOC), which utilizes O 2as the mobile ion. SOCs produce CO and O2 at the thermoneutral voltage of ~1.46 V with current densities exceeding 1 A/cm 2 -similar to steam electrolysis, which can be carried out simultaneously in the same cell to produce syngas or methane 1,2,5,6 . The same SOC can be operated in reverse as a fuel cell to re-oxidize the fuel products, thereby enabling operation as a flow battery 6,7 . Another important application is O2 (and CO) production from the CO2-rich atmosphere of Mars for rocket propulsion and life support, which will be demonstrated on the NASA Mars 2020 rover 8 .

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“…It relies heavily on the desulfurization treatment of fuels such as pure hydrogen or syngas, and cannot further reduce the operating cost of RSOFC. Besides, NiO is combined with proton conductors such as BaCe 0.7 Zr 0.1 Y 0.1 Yb 0.1 O 3-d (Yang et al, 2009), BaZr 0.4 Ce 0.4 Y 0.3 O 3 (Wang et al, 2014b) and the carbon and sulfur deposited on the surface are removed by the adsorption capacity of the proton conductor to water vapor. To a certain extent, the Ni anode's ability to resist carbon deposition and sulfur poisoning is improved, but the range is limited, and the proton conductor is difficult to prepare and sinter and the stability needs to be improved.…”

Section: Ni-based Composite Fuel Electrode Materialsmentioning

confidence: 99%

Progress and prospects of reversible solid oxide fuel cell materials

Shen

et al. 2021

iScience

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Reversible solid oxide fuel cell (RSOFC) is an energy device that flexibly interchanges between electrical and chemical energy according to people's life and production needs. The development of cell materials affects the stability and cost of the cell, but also restricts its market-oriented development. After decades of research by scientists, a lot of achievements and progress have been made on RSOFC materials. According to the composition and requirements of each component of RSOFC, this article summarizes the research progress based on materials and discusses the merits and demerits of current cell materials in electrochemical performance. According to the efficiency of different materials in solid oxide fuel cell (SOFC mode) and solid oxide electrolyzer (SOEC mode), the challenges encountered by RSOFC in the operation are evaluated, and the future development of RSOFC materials is boldly prospected.

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ChemInform Abstract: Enhanced Sulfur and Coking Tolerance of a Mixed Ion Conductor for SOFCs: BaZr_0.1Ce_0.7Y_0.2‐xYb_xO_3‐δ.

Cited by 13 publications

References 1 publication

A Highly Efficient Multi-phase Catalyst Dramatically Enhances the Rate of Oxygen Reduction

A Highly Efficient Multi-phase Catalyst Dramatically Enhances the Rate of Oxygen Reduction

Selective high-temperature CO2 electrolysis enabled by oxidized carbon intermediates

Progress and prospects of reversible solid oxide fuel cell materials

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