Electrochemical performance and carbon deposition of anode-supported solid oxide fuel cell exposed to H2CO fuels

Bian, Liu; Chen, Zhi Yuan; Wang, Li Jun; Li, Fu Shen; Chou, Kang Ju

doi:10.1016/j.ijhydene.2016.08.214

Cited by 24 publications

(10 citation statements)

References 36 publications

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“…In particular, it is known that carbon deposition by the CO disproportionation reaction (eq ) leads to serious degradation of Ni-based electrode catalysts. To avoid this issue, two strategies have been usually adopted; one is lowering the operating temperature below 700 °C to slow down the coking kinetics, and the other is operating under high current density at a higher temperature. ,, To demonstrate the robustness of the anode catalyst in the operation with syngas stream, Figure a shows the long-term output performance of the NiFe-R.P.PSFNNb electrode under a constant current density of 180 mA·cm –2 in the humidified syngas at 800 °C for 70 h. A negligible degradation rate (with 0.6103 mV·h –1 ) was obtained, demonstrating the high resistance against carbon coking for the NiFe-R.P.PSFNNb electrode. …”

Section: Resultsmentioning

confidence: 99%

“…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%

“…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− ). 9 Notwithstanding the potentials of the combined operation in the RSOCs, the conventional Ni-based fuel electrodes have vulnerability issues because of the several fouling phenomena.…”

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: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…In practice, carbon deposition is one key factor for the performance degradation of DIR-SOFCs fed with hydrocarbons. ,, The deposited carbon might cover active sites of catalyst and ion conducting YSZ or block gas diffusion, resulting in higher ohmic and polarization resistance, and thus causing performance degradation − and might even lead to cell cracking . For a methanol DIR-SOFC, the carbon formation originates from the following three possible reactions: (i) CO disproportionation (eq ), (ii) CO reduction (eq ), and (iii) methane cracking (eq ).…”

Section: Introductionmentioning

confidence: 99%

Power Generation by Flat-Tube Solid Oxide Fuel Cells with Enhanced Internal Reforming of Methanol

Sang

Yang

et al. 2022

ACS Sustainable Chem. Eng.

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Methanol is a promising fuel for solid oxide fuel cells (SOFCs) because of its low cost and ease of storage and transportation. In this work, the performance and long-term durability of direct methanol flat-tube SOFCs are investigated under different steam/carbon (S/C) ratios. It is confirmed that the S/C ratio exhibits little influence on cell performance but strongly affects long-term stability. The cell is discharged stably under high S/C ratios of 1.5 and 1.2, while it fails abruptly under a low S/C ratio of 1 due to severe carbon deposition. Extra nickel/yttria stabilized zirconia (Ni/YSZ) catalyst is added into the anode channels to serve as a prereformer. With improved internal reforming, the methanol conversion rate is promoted to 95% under S/C = 1, higher than that without extra catalyst and most results reported in the literature, and carbon deposition within the anode is significantly suppressed. Thus, no performance degradation is observed for 300 h of discharge under S/C = 1. On the basis of the experimental and simulating results, the mechanism of methanol conversion within the flat-tube cells is discussed.

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“…Finally, the carbon formation on electrolyzer surfaces is a critical issue for SOEC performance since the carbon deposition obstructs the reaction sites and prevents inlet gas from reaching the TPB. The coke formation occurs when the voltage is high enough and is facilitated by nickel-based electrodes since Ni is a suitable catalyst for carbon deposition [268]. Carbon formation is also affected by operating temperature and pressure and reactant composition and utilization rate.…”

Section: High-temperature Electrolysis Cellsmentioning

confidence: 99%

Green Synthetic Fuels: Renewable Routes for the Conversion of Non-Fossil Feedstocks into Gaseous Fuels and Their End Uses

et al. 2020

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Innovative renewable routes are potentially able to sustain the transition to a decarbonized energy economy. Green synthetic fuels, including hydrogen and natural gas, are considered viable alternatives to fossil fuels. Indeed, they play a fundamental role in those sectors that are difficult to electrify (e.g., road mobility or high-heat industrial processes), are capable of mitigating problems related to flexibility and instantaneous balance of the electric grid, are suitable for large-size and long-term storage and can be transported through the gas network. This article is an overview of the overall supply chain, including production, transport, storage and end uses. Available fuel conversion technologies use renewable energy for the catalytic conversion of non-fossil feedstocks into hydrogen and syngas. We will show how relevant technologies involve thermochemical, electrochemical and photochemical processes. The syngas quality can be improved by catalytic CO and CO2 methanation reactions for the generation of synthetic natural gas. Finally, the produced gaseous fuels could follow several pathways for transport and lead to different final uses. Therefore, storage alternatives and gas interchangeability requirements for the safe injection of green fuels in the natural gas network and fuel cells are outlined. Nevertheless, the effects of gas quality on combustion emissions and safety are considered.

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Electrochemical performance and carbon deposition of anode-supported solid oxide fuel cell exposed to H2CO fuels

Cited by 24 publications

References 36 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

Power Generation by Flat-Tube Solid Oxide Fuel Cells with Enhanced Internal Reforming of Methanol

Green Synthetic Fuels: Renewable Routes for the Conversion of Non-Fossil Feedstocks into Gaseous Fuels and Their End Uses

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