Electrochemical performance of low-temperature solid oxide fuel cells running on syngas from pyrolytic urban sludge

Yu, Lixiang; Huang, Jiajia; Jing, Yingying; Maliutina, Kristina; Ma, Rui; Fan, Liangdong

doi:10.1016/j.ceramint.2021.02.268

Cited by 6 publications

(8 citation statements)

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“…As a promising technology to resolve the current global environmental and energy issues, reversible solid oxide cells (RSOCs) are attracting great interest because of their high efficiency in the combined operations of electrical power generating with no pollutant emission as well as fuel harvesting using off-peak electrical energy in a reverse operation. − In particular, the existence of O 2– anion transported through a solid electrolyte renders much greater fuel flexibility in fuel cell mode, capable of the direct operation in various combustible fuels, including syngas and hydrocarbons . Direct use of syngas as a fuel could be the bridge between traditional hydrocarbon-based energy and prospective hydrogen-based energy systems. , However, the electrochemical oxidation of CO as a fuel is more complex compared to that of H 2 ; thus the operation of the solid oxide fuel cell (SOFC) fueled by syngas still remains a challenging issue. , As an another advantage of RSOCs, the reverse mode can also well match with many electrolysis reactions that electrochemically extract O 2– from the oxygenated species such as CO 2 under externally applied potential through an electrolysis reaction (i.e., CO 2 + 2e – = CO + O 2– ) …”

Section: Introductionmentioning

confidence: 99%

“…4 Direct use of syngas as a fuel could be the bridge between traditional hydrocarbonbased energy and prospective hydrogen-based energy systems. 5,6 However, the electrochemical oxidation of CO as a fuel is more complex compared to that of H 2 ; thus the operation of the solid oxide fuel cell (SOFC) fueled by syngas still remains a challenging issue. 7,8 As an another advantage of RSOCs, the reverse mode can also well match with many electrolysis reactions that electrochemically extract O 2− from the oxygenated species such as CO 2 under externally applied potential through an electrolysis reaction (i.e., CO 2 + 2e − = CO + O 2− ).…”

Section: ■ Introductionmentioning

confidence: 99%

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A Highly Efficient Bifunctional Electrode Fashioned with In Situ Exsolved NiFe Alloys for Reversible Solid Oxide Cells

Choi

Kim

Kang

et al. 2022

ACS Sustainable Chem. Eng.

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We developed a bifunctional electrode of Pr 0.8 Sr 1.2 (Fe,Ni) 0.8 Nb 0.2 O 4−δ (R.P.PSFNNb) fashioned with in situ exsolved Ni-Fe alloy nanoparticles (NPs) for electrochemical oxidations of H 2 , CO, and syngas as well as CO 2 electrolysis. The NiFe-R.P.PSFNNb was prepared by in situ phase transition of Pr 0.4 Sr 0.6 Fe 0.8 Ni 0.1 Nb 0.1 O 3−δ (PSFNNb) along with exsolution of Ni-Fe alloys in a reducing atmosphere, as confirmed by X-ray diffraction and X-ray photoelectron spectroscopy (XPS) characterization. XPS and H 2 -temperature-programmed reduction analyses were also conducted to examine the behavior of the exsolution process. Transmission electron microscopy and electron energy loss spectroscopy element mapping concluded that the Ni-Fe alloy NPs were successfully exsolved and anchored on the parent oxide material. The NiFe-R.P.PSFNNb exhibited superior electrochemical performance for fuel electrode reactions of reversible solid oxide cells (RSOCs). A maximum peak power density of 829, 522, and 749 mW•cm −2 was obtained for the electrochemical oxidations of H 2 , CO, and syngas, respectively, and a high current density of −1.89 A•cm −2 was produced in the electrochemical reduction of CO 2 to CO at a temperature of 850 °C. More interestingly, no significant degradation of the electrochemical performance was observed in both operating modes, indicating that the NiFe-R.P.PSFNNb proposed in this work could be a promising candidate as a bifunctional electrode for the practical implementation of RSOCs.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

A Highly Efficient Bifunctional Electrode Fashioned with In Situ Exsolved NiFe Alloys for Reversible Solid Oxide Cells

Choi

Kim

Kang

et al. 2022

ACS Sustainable Chem. Eng.

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“…The ionic conductor material LNSDC was prepared by a two-step synthesis method according to our previous work . First, the Sm 0.2 Ce 0.8 O 1.9 (SDC) material was prepared by the co-precipitation method.…”

Section: Methodsmentioning

confidence: 99%

“…The ionic conductor material LNSDC was prepared by a two-step synthesis method according to our previous work. 42 First, the Sm 0.2 Ce 0.8 O 1.9 (SDC) material was prepared by the co-precipitation method. Stoichiometric amounts of Ce(NO 3 ) 3 •6H 2 O and Sm(NO 3 ) 3 • 6H 2 O were completely dissolved in deionized water, and then the NH 4 HCO 3 solution (1 M) was dropped with the final pH value close to 8.…”

Section: Materials Preparationmentioning

confidence: 99%

Ni/NiO Exsolved Perovskite La_0.2Sr_0.7Ti_0.9Ni_0.1O_3−δ for Semiconductor-Ionic Fuel Cells: Roles of Electrocatalytic Activity and Physical Junctions

Wang

Meng

Singh

et al. 2022

ACS Appl. Mater. Interfaces

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A semiconductor-ionic fuel cell (SIFC) is recognized as a promising technology and an alternative approach to reduce the operating temperature of solid oxide fuel cells. The development of alternative semiconductors substituting easily reduced transition metal oxide is a great challenge as high activity and durability should be satisfied simultaneously. In this study, the B-site Ni-doped La0.2Sr0.7Ti0.9Ni0.1O3−δ (LSTN) perovskite is synthesized and used as a potential semiconductor for SIFC. The in situ exsolution and A-site deficiency strategy enable the homogeneous decoration of Ni/NiO nanoparticles as reactive sites to improve the electrode reaction kinetics. It also supports the formation of basic ingredient of the Schottky junction to improve the charge separation efficiency. Furthermore, additional symmetric Ni0.8Co0.15Al0.05LiO2−δ (NCAL) electrocatalytic electrode layers significantly enhance the electrode reaction activity and cells’ charge separation efficiency, as confirmed by the superior open circuit voltage of 1.13 V (close to Nernst’s theoretical value) and peak power density of 650 mW cm–2 at 550 °C, where the latter is one order of magnitude higher than NCAL electrode-free SIFC. Additionally, a bulk heterojunction effect is proposed to illustrate the electron-blocking and ion-promoting processes of the semiconductor-ionic composite electrolyte in SIFCs, based on the energy band values of the applied materials. Overall, we found that the energy conversion efficiency of novel SIFC can be remarkably improved through in situ exsolution and intentional introduction of the catalytic functionality.

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“…The changes brought about by the selection of cermet oxide materials are associated with their ionic conductivity, thermal stability, oxygen storage capacity, and chemical properties. Doped ceria such as SDC, GDC, and LDC are remarkable materials that have been investigated for low-temperature SOFCs , because they showed higher ionic and electronic conductivity in a reducing environment as compared to that of YSZ. − Therefore, doped ceria is considered a promising cermet and electrolyte material for intermediate- (600–800 °C) and low (≤600 °C)-temperature SOFCs. , …”

Section: Introductionmentioning

confidence: 99%

Catalytically Active and Carbon-Resistive Anode Catalyst for Solid-Oxide Fuel Cells Operated at Low Temperatures (500–600 °C)

Rafique

Rafaqat

Abbas

et al. 2023

ACS Appl. Energy Mater.

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The development of active catalysts is always challenging in the field of energy devices. In this work, Li-doped, Ni−Cu-based, and Ni-free nanocomposite anode catalysts are synthesized and studied for solid-oxide fuel cells (SOFCs) operated at a low temperature using hydrogen and biogas as fuels. The catalysts with compositions Ni 0.6 Li 0.2 Cu 0.2 -oxide/ La 0 . 2 Ce 0 . 8 O 2δ (NLC622-LDC), Ni 0 . 2 Li 0 . 2 Cu 0 . 6 -oxide/ La 0.2 Ce 0.8 O 2-δ (NLC226-LDC), and Ni 0.0 Li 0.2 Cu 0.8 -oxide/ La 0.2 Ce 0.8 O 2-δ (NLC028-LDC) are synthesized using the glycerol-assisted gel combustion route (GGCR). The structural analysis revealed the cubic structure of metallic oxide materials such as NiO and CuO phases while the cubic fluorite structure of CeO 2 as an ionic oxide phase. The optical band gaps (E g 's) of anode catalysts NLC622-LDC, NLC226-LDC, and NLC028-LDC are found to be 2.08, 2.29, and 2.37 eV, respectively. Furthermore, the anode catalyst with a higher nickel concentration shows better electrical conductivity and a lower activation energy of 3.47 S cm −1 and 0.67 eV at 600 °C, respectively, as compared to those of a nickel-free anode catalyst with lower nickel content. The electrochemical behavior of nanocomposites is studied at 600 °C using Nyquist plots. Electrochemical impedance analysis is carried out to see the effect of hydrocarbon fuel like biogas at the anode side. Finally, the electrochemical performance of NiLiCu-LDC catalyst-based fuel cells is tested under hydrogen and biogas fuels. Overall, the fuel cell based on the NLC622-LDC anode catalyst has higher OCV and power density with both fuels, hydrogen and biogas. Therefore, NLC622-LDC is a highly catalytically active anode catalyst which demonstrated significantly better performance for SOFCs operated at a low temperature (500−600 °C) without any carbon resistance.

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Electrochemical performance of low-temperature solid oxide fuel cells running on syngas from pyrolytic urban sludge

Cited by 6 publications

References 59 publications

A Highly Efficient Bifunctional Electrode Fashioned with In Situ Exsolved NiFe Alloys for Reversible Solid Oxide Cells

A Highly Efficient Bifunctional Electrode Fashioned with In Situ Exsolved NiFe Alloys for Reversible Solid Oxide Cells

Ni/NiO Exsolved Perovskite La_0.2Sr_0.7Ti_0.9Ni_0.1O_3−δ for Semiconductor-Ionic Fuel Cells: Roles of Electrocatalytic Activity and Physical Junctions

Catalytically Active and Carbon-Resistive Anode Catalyst for Solid-Oxide Fuel Cells Operated at Low Temperatures (500–600 °C)

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Electrochemical performance of low-temperature solid oxide fuel cells running on syngas from pyrolytic urban sludge

Cited by 6 publications

References 59 publications

A Highly Efficient Bifunctional Electrode Fashioned with In Situ Exsolved NiFe Alloys for Reversible Solid Oxide Cells

A Highly Efficient Bifunctional Electrode Fashioned with In Situ Exsolved NiFe Alloys for Reversible Solid Oxide Cells

Ni/NiO Exsolved Perovskite La0.2Sr0.7Ti0.9Ni0.1O3−δ for Semiconductor-Ionic Fuel Cells: Roles of Electrocatalytic Activity and Physical Junctions

Catalytically Active and Carbon-Resistive Anode Catalyst for Solid-Oxide Fuel Cells Operated at Low Temperatures (500–600 °C)

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Ni/NiO Exsolved Perovskite La_0.2Sr_0.7Ti_0.9Ni_0.1O_3−δ for Semiconductor-Ionic Fuel Cells: Roles of Electrocatalytic Activity and Physical Junctions