Electrochemical promotion of methane oxidation on Pd nanoparticles deposited on YSZ

Kalaitzidou, I.; Zagoraios, Dimitrios; Brosda, S.; Katsaounis, Alexandros; Vernoux, P.; Vayenas, C.G.

doi:10.1016/j.matpr.2018.09.050

Cited by 7 publications

(8 citation statements)

References 22 publications

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“…In the majority of earlier EPOC studies, − the Sabatier reaction is considered as an electrophobic reaction since anodic polarization results in an enhancement of its rate, while the rate of the RWGS reaction is increased during cathodic polarization, following an electrophilic behavior. Recent studies over free-standing or supported metal nanoparticles gave a boost to a new era for the EPOC effect. ,, Despite the rich literature on EPOC, the use of nonprecious metals is relatively rare.…”

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confidence: 99%

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Tuning the RWGS Reaction via EPOC and In Situ Electro-oxidation of Cobalt Nanoparticles

et al. 2020

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The electrochemical promotion of catalytic activity by non-noble transition metals is rarely reported in the literature. Here, Co nanoparticles were utilized for the electrochemical activation of CO2 hydrogenation under atmospheric pressure conditions. A range of transient kinetic experiments in conjunction with X-ray photoelectron spectroscopy and imaging techniques were employed to correlate the observed catalytic activity with the electronic and morphological characteristics of the cobalt catalyst surface. Our results show that migrating ions from the solid electrolyte to the catalyst surface has a dual effect, which has an impact on the observed catalytic behavior. First, they lead to an electrochemically formed double layer on the catalyst surface, which effectively modifies the catalyst work function and consequently alters the observed catalytic rate. Second, they have a profound effect on the oxidation state of cobalt and therefore on the structure of the cobalt oxide particles formed. The presence of Co oxide phases upon anodic polarization shows up to a 5-fold increase in the catalytic rate of the reverse water gas shift (RWGS) reaction. The enhancement of the catalytic activity observed in this work, with a relatively inexpensive cobalt oxide film, is comparable to that obtained with noble metal catalysts in classical EPOC studies. The present study also demonstrates that the formation of different oxide phases can be controlled accurately by electrochemical means and used to tune the catalytic activity and selectivity of cobalt. The reported results could guide the design and operation of more selective and active catalytic processes for the RWGS reaction.

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Section: Introductionmentioning

confidence: 99%

“…Recent studies over free-standing or supported metal nanoparticles gave a boost to a new era for the EPOC effect. 41,44,45 Despite the rich literature on EPOC, the use of nonprecious metals is relatively rare.…”

Section: ■ Introductionmentioning

confidence: 99%

Tuning the RWGS Reaction via EPOC and In Situ Electro-oxidation of Cobalt Nanoparticles

et al. 2020

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“…Since the discovery of EPOC in the early 1980s, over 100 different catalytic reactions have been performed displaying the EPOC effect for various reactions and reactor types. − A detailed atomistic understanding of the influence of the electric potential on the surface state and the corresponding catalytic properties is still an active topic of research. − Such insight is a crucial factor in interpreting the experimental observations and putting conclusions from past studies on solid theoretical ground. An elucidation on what is occurring during the reaction could allow for the development of an efficient and novel catalytic electrode design that can fully exploit the power of EPOC, i.e., operate at rather low temperature and still display superior catalytic activity for key reactions such as the complete oxidation of methane, , NO x reduction, complete oxidation of volatile organic compounds (VOCs), − and CO 2 hydrogenation. − …”

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confidence: 99%

“…13−17 Such insight is a crucial factor in interpreting the experimental observations and putting conclusions from past studies on solid theoretical ground. An elucidation on what is occurring during the reaction could allow for the development of an efficient and novel catalytic electrode design that can fully exploit the power of EPOC, i.e., operate at rather low temperature and still display superior catalytic activity for key reactions such as the complete oxidation of methane, 18,19 NO x reduction, 20 complete oxidation of volatile organic compounds (VOCs), 21−23 and CO 2 hydrogenation. 24−26 One of the early works focusing on the origin of EPOC was performed in the case of the methane combustion catalyzed by Pt supported over YSZ.…”

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confidence: 99%

“…This second oxygen species is generally assumed to originate from YSZ as a backspillover oxygen species. 28 Furthermore, isotopic exchange done by Tsampas et al showed that using 18 O 2 in the gas feed led to an increase in isotopically labeled CO 2 during anodic polarization for the oxidation of propane on Pt/YSZ. 30 The production of CO 2 under anodic polarization contained C 18 O 2 along with C 16 O 2 and C 16 O 18 O, confirming that 16 O is supplied from YSZ to the Pt catalyst.…”

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