Redox‐Reversible Iron Orthovanadate Cathode for Solid Oxide Steam Electrolyzer

Gan, Lizhen; Ye, Lingting; Ruan, Cong; Chen, Shigang; Xie, Kui

doi:10.1002/advs.201500186

Cited by 37 publications

(15 citation statements)

References 52 publications

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“…The SFMO itself is an oxygen-nonstoichiometric catalyst and the iron species with unsaturated oxygen coordination at the SFMO surface would deliver catalytic activity. In contrast, redox stable La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3− δ (LSCM) electrode without iron dopant in the lattice shows negligible catalysis activity toward C 2 H 4 generation 11 . It is also observed that the metal–oxide interfaces enhance C 2 product generation by ~50–100%, indicating the favorable cleavage of C–H bond at metal–oxide interfaces.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical conversion of methane to ethylene in a solid oxide electrolyzer

et al. 2019

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Conversion of methane to ethylene with high yield remains a fundamental challenge due to the low ethylene selectivity, severe carbon deposition and instability of catalysts. Here we demonstrate a conceptually different process of in situ electrochemical oxidation of methane to ethylene in a solid oxide electrolyzer under ambient pressure at 850 °C. The porous electrode scaffold with an in situ-grown metal/oxide interface enhances coking resistance and catalyst stability at high temperatures. The highest C2 product selectivity of 81.2% together with the highest C2 product concentration of 16.7% in output gas (12.1% ethylene and 4.6% ethane) is achieved while the methane conversion reaches as high as 41% in the initial pass. This strategy provides an optimal performance with no obvious degradation being observed after 100 h of high temperature operation and 10 redox cycles, suggesting a reliable electrochemical process for conversion of methane into valuable chemicals.

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Section: Resultsmentioning

confidence: 99%

Electrochemical conversion of methane to ethylene in a solid oxide electrolyzer

et al. 2019

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“…The cathode material LSCrF x is synthesized by a glycinenitrate combustion method and the samples are calcinated at 1300 °C for 5 h [33]. Ce 0.8 Sm 0.2 O 2−δ (SDC) powder is prepared using a glycine-nitric acid combustion method at 800 °C in air for 3 h [34,35]. Zr 0.84 Y 0.16 O 2−δ (YSZ) powders are pressed to form electrolyte disk with a diameter of 20 mm and calcinated at 1550 °C for 10 h to obtain a ceramic electrolyte [36].…”

Section: Methodsmentioning

confidence: 99%

Exsolved metallic iron nanoparticles in perovskite cathode to enhance CO2 electrolysis

Zhang

Yang

Gan

2021

J Solid State Electrochem

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Traditional metal and metal cermet cathodes are easy to be oxidized when operating with pure CO 2 electrolysis, which therefore leads the degradation of electrolysis performance. Redox stable ceramic cathode provides alternative to achieve direct electrolysis of CO 2 ; however, they show very limited catalytic activity toward CO 2 splitting. In this work, we prepare perovskite materials La 0.75 Sr 0.25 Cr 0.5 Fe 0.5+x O 3−δ (LSCrF x , x = 0-0.1) through synergistic doping and treat them in H 2 /Ar to exsolve metallic Fe nanoparticles on LSCF scaffolds to enhance the catalytic activity. With the exsolution of iron nanoparticles, the cathode performance is enhanced by ~ 4-5 times with the CO product of 5.88 mL min −1 cm −2 and the current efficiency of ~ 97.5%. We further demonstrate the excellent thermal stability of CO 2 electrolysis even after a continuous operation of 60 h and 6 redox cycles. This inspires exsolving metal nanoparticles over perovskite surface as a new technology for simultaneously enhancing catalytic activity and stability.

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“…The NiMn 2 O 4 powders are synthesized through a combustion method and calcined at 1200 °C for 6 h in air 29 . For Ni/MnO x cathode, NiO, and NiMn 2 O 4 are mixed with 0–20 wt% weight ratio of NiMn 2 O 4 .…”

Section: Methodsmentioning

confidence: 99%

Enhanced carbon dioxide electrolysis at redox manipulated interfaces

et al. 2019

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Utilization of carbon dioxide from industrial waste streams offers significant reductions in global carbon dioxide emissions. Solid oxide electrolysis is a highly efficient, high temperature approach that reduces polarization losses and best utilizes process heat; however, the technology is relatively unrefined for currently carbon dioxide electrolysis. In most electrochemical systems, the interface between active components are usually of great importance in determining the performance and lifetime of any energy materials application. Here we report a generic approach of interface engineering to achieve active interfaces at nanoscale by a synergistic control of materials functions and interface architectures. We show that the redox-manipulated interfaces facilitate the atomic oxygen transfer from adsorbed carbon dioxide molecules to the cathode lattice that determines carbon dioxide electrolysis at elevated temperatures. The composite cathodes with in situ grown interfaces demonstrate significantly enhanced carbon dioxide electrolysis and improved durability.

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Redox‐Reversible Iron Orthovanadate Cathode for Solid Oxide Steam Electrolyzer

Cited by 37 publications

References 52 publications

Electrochemical conversion of methane to ethylene in a solid oxide electrolyzer

Electrochemical conversion of methane to ethylene in a solid oxide electrolyzer

Exsolved metallic iron nanoparticles in perovskite cathode to enhance CO2 electrolysis

Enhanced carbon dioxide electrolysis at redox manipulated interfaces

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