Co-generation of electricity and syngas on proton-conducting solid oxide fuel cell with a perovskite layer as a precursor of a highly efficient reforming catalyst

Exsolution has been intensively studied in the fields of energy conversion and storage as a method for the preparation of catalytically active and durable metal nanoparticles. Under typical conditions, however, only a limited number of nanoparticles can be exsolved from the host oxides. Herein, we report the preparation of catalytic nanoparticles by selective exsolution through topotactic ion exchange, where deposited Fe guest cations can be exchanged with Co host cations in PrBaMn1.7Co0.3O5+δ. Interestingly, this phenomenon spontaneously yields the host PrBaMn1.7Fe0.3O5+δ, liberating all the Co cations from the host owing to the favorable incorporation energy of Fe into the lattice of the parent host (ΔEincorporation = −0.41 eV) and the cation exchange energy (ΔEexchange = −0.34 eV). Remarkably, the increase in the number of exsolved nanoparticles leads to their improved catalytic activity as a solid oxide fuel cell electrode and in the dry reforming of methane.

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“…The dry reforming reaction is shown as below, CO 2 conversion and CO selectivity were calculated using the following equations 34,35 :…”

Section: Methodsmentioning

confidence: 99%

Cation-swapped homogeneous nanoparticles in perovskite oxides for high power density

et al. 2019

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“…Hydrogen has been demonstrated to be the most environmentally friendly feedstock for fuel cells. Unlike polymer electrolyte membrane fuel cells (PEMFCs) which can only be powered by ultra‐pure H 2 and simple alcohols, the potential fuels for SOFCs can further include carbon monoxide, biogas, hydrocarbons, etc . External reforming and internal reforming are two important operational modes in SOFCs, which are based on whether the fuel processing part is integrated or not.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in the Development of Anode Materials for Solid Oxide Fuel Cells Utilizing Liquid Oxygenated Hydrocarbon Fuels: A Mini Review

Wang

Julião

et al. 2018

Energy Tech

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Solid oxide fuel cells (SOFCs) are the most widely used fuel cells due to their excellent fuel flexibility, high efficiency and low emissions. Although the liquid fuels are easier to handle and transport than hydrogen, their direct use in SOFC leads to serious performance deterioration because of the coke formation on the traditional Ni‐based cermet anodes. In this review, the advances in the development of coking resistant anodes and the new liquid fuels such as oxygenated hydrocarbons to solve the problem of coke formation with Ni‐based anodes are summarized. It is concluded that Ni‐based cermets are still the most promising anode materials and some targeted modifications are needed to improve the coking resistance. Several strategies to improve the coking resistance of Ni‐based anodes are highlighted. The aim of this review is to provide some helpful guidance and potential directions for the future design of anodes for SOFCs utilizing liquid oxygenated hydrocarbon fuels directly.

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“…SrSc 0.175 Nb 0.025 Co 0.8 O 3−δ (SSNC) and BaZr 0.1 Ce 0.7 Y 0.2 O 3−δ (BZCY) fine powders were prepared by the classic sol–gel method. Our previous research provides valuable details on the synthesis process. , To synthesize BZCY, first, the required amount of nitrates with Ba 2+ , Zr 4+ , Ce 3+ , and Y 3+ were completely dissolved in deionized water with the help of a magnetic stirrer. Citric acid and ethylenediaminetetraacetic acid (EDTA) in a molar ratio of CA:EDTA = 2:1 were added, with an appropriate amount of complexing agent in the sol–gel route, and ammonia–water was added to raise the pH of the solution to neutral.…”

Section: Experimental Sectionmentioning

confidence: 99%

Tuning the Oxygen Vacancy of the SrSc_0.175Nb_0.025Co_0.8O_3−δ Cathode toward Enhanced Oxygen Reduction Reaction for H⁺-SOFCs by Water Uptake

et al. 2021

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The cell output performance of proton-conducting solid oxide fuel cells (H + -SOFCs) is still unsatisfactory due to insufficient intrinsic proton conduction in the traditional perovskite oxides. Previously, we found that the introduction of water can activate proton conduction in the cathode part of the SrSc 0.175 Nb 0.025 Co 0.8 O 3−δ (SSNC) to enhance its oxygen reduction reaction. To explore the mechanism, we conducted a detailed analysis using X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy, and a distribution of relaxation times. Studies found that the introduction of water reduced the valence of the Co ion, increased more oxygen vacancies for generation of more proton defects, and thereby accelerated the process of oxygen reduction. The rate-limiting step of SSNC cathode for oxygen reduction reaction process was changed from the charge transfer process to the surface exchange and oxygen ion diffusion by water uptake. The research results may bring new progress to the development of H + -SOFCs.

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Co-generation of electricity and syngas on proton-conducting solid oxide fuel cell with a perovskite layer as a precursor of a highly efficient reforming catalyst

Cited by 37 publications

References 31 publications

Cation-swapped homogeneous nanoparticles in perovskite oxides for high power density

Cation-swapped homogeneous nanoparticles in perovskite oxides for high power density

Recent Advances in the Development of Anode Materials for Solid Oxide Fuel Cells Utilizing Liquid Oxygenated Hydrocarbon Fuels: A Mini Review

Tuning the Oxygen Vacancy of the SrSc_0.175Nb_0.025Co_0.8O_3−δ Cathode toward Enhanced Oxygen Reduction Reaction for H⁺-SOFCs by Water Uptake

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Co-generation of electricity and syngas on proton-conducting solid oxide fuel cell with a perovskite layer as a precursor of a highly efficient reforming catalyst

Cited by 37 publications

References 31 publications

Cation-swapped homogeneous nanoparticles in perovskite oxides for high power density

Cation-swapped homogeneous nanoparticles in perovskite oxides for high power density

Recent Advances in the Development of Anode Materials for Solid Oxide Fuel Cells Utilizing Liquid Oxygenated Hydrocarbon Fuels: A Mini Review

Tuning the Oxygen Vacancy of the SrSc0.175Nb0.025Co0.8O3−δ Cathode toward Enhanced Oxygen Reduction Reaction for H+-SOFCs by Water Uptake

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Tuning the Oxygen Vacancy of the SrSc_0.175Nb_0.025Co_0.8O_3−δ Cathode toward Enhanced Oxygen Reduction Reaction for H⁺-SOFCs by Water Uptake