Ni-substituted LaMnO3 perovskites for ethanol oxidation

Hou, Yi Chen; Ding, Ming Wei; Liu, Shih Kang; Wu, Shin Kuan; Lin, Yu Chuan

doi:10.1039/c3ra46323k

Cited by 26 publications

(17 citation statements)

References 63 publications

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“…Owing to their stability, electronic properties, and low production cost, this class of materials has received significant attention in sensing technologies. During the last few years, molecular adsorption on different perovskite surfaces was investigated by both experimental [19][20][21][22][23][24] and first-principles methods. 21,[25][26][27][28] The results provided a basic understanding of the surface chemistry of perovskites, revealing rather strong CO 2 adsorption even on stoichiometric surfaces.…”

Section: Introductionmentioning

confidence: 99%

Band gap modulation of SrTiO₃ upon CO₂ adsorption

Sopiha

Malyi

Persson

et al. 2017

Phys. Chem. Chem. Phys.

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CO 2 chemisorption on SrTiO 3 (001) surfaces is studied using ab initio calculations in order to establish new chemical sensing mechanisms. We find that CO 2 adsorption opens the material band gap, however, while the adsorption on the TiO 2 -terminated surface neutralizes surface states at the valence band (VB) maximum, CO 2 on the SrO-terminated surfaces suppresses the conduction band (CB) minimum. For the TiO 2 -terminated surface, the effect is explained by the passivation of dangling bonds, whereas for the SrO-terminated surface, the suppression is caused by the surface relaxation. Modulation of the VB states implies a more direct change in charge distribution, and thus the induced change in band gap is more prominent at the TiO 2 termination. Further, we show that both CO 2 adsorption energy and surface band gap are strongly dependent on CO 2 coverage, suggesting that the observed effect can be utilized for sensing application in a wide range of CO 2 concentrations.

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Section: Introductionmentioning

confidence: 99%

Band gap modulation of SrTiO₃ upon CO₂ adsorption

Sopiha

Malyi

Persson

et al. 2017

Phys. Chem. Chem. Phys.

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“…The shoulder peak centered between 200 °C and 300 °C could be ascribed to the reduction of weakly adsorbed oxygen species, 3+ and Mn 4+ species in the LaMnO 3 -based perovskite catalysts has been reported [28]. However, in this work, Mn 2+ species were unlikely existed due to the missing satellite peaks at around 648.8 eV [29]. The XPS signals of Mn 2p 3/2 can be deconvoluted into two major peaks.…”

Section: Redox Properties Of the Catalystsmentioning

confidence: 60%

Plasma Oxidation of H2S over Non-stoichiometric LaxMnO3 Perovskite Catalysts in a Dielectric Barrier Discharge Reactor

et al. 2018

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In this work, plasma-catalytic removal of H2S over LaxMnO3 (x = 0.90, 0.95, 1, 1.05 and 1.10) has been studied in a coaxial dielectric barrier discharge (DBD) reactor. The non-stoichiometric effect of the LaxMnO3 catalysts on the removal of H2S and sulfur balance in the plasma-catalytic process has been investigated as a function of specific energy density (SED). The integration of the plasma with the LaxMnO3 catalysts significantly enhanced the reaction performance compared to the process using plasma alone. The highest H2S removal of 96.4% and sulfur balance of 90.5% were achieved over the La0.90MnO3 catalyst, while the major products included SO2 and SO3. The missing sulfur could be ascribed to the sulfur deposited on the catalyst surfaces. The non-stoichiometric LaxMnO3 catalyst exhibited larger specific surface areas and smaller crystallite sizes compared to the LaMnO3 catalyst. The non-stoichiometric effect changed their redox properties as the decreased La/Mn ratio favored the transformation of Mn3+ to Mn4+, which contributed to the generation of oxygen vacancies on the catalyst surfaces. The XPS and H2-TPR results confirmed that the Mn-rich catalysts showed the higher relative concentration of surface adsorbed oxygen (Oads) and lower reduction temperature compared to LaMnO3 catalyst. The reaction performance of the plasma-catalytic oxidation of H2S is closely related to the relative concentration of Oads formed on the catalyst surfaces and the reducibility of the catalysts.

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“…This potentially synergistic metal-oxygen interaction induced by this bond configuration may not only perceptibly improve the ethanol oxidation performance but also increaset he perovskites' observed thermals tabilityd uring the reaction process. [4] Another key tunable parameter relatest ot he synthesis protocol used to generate the perovskites themselves. Specifically, the synthetic route can determine not only the size, shape, and morphology but also the achievable active surface area availablet ot he perovskite catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Ni‐substituted LaMnO 3 perovskites yield unique bridging lattice oxygen sites (i.e., Ni‐O‐Mn). This potentially synergistic metal–oxygen interaction induced by this bond configuration may not only perceptibly improve the ethanol oxidation performance but also increase the perovskites’ observed thermal stability during the reaction process …”

Section: Introductionmentioning

confidence: 99%

Nanoscale Perovskites as Catalysts and Supports for Direct Methanol Fuel Cells

Tan

Salvatore

et al. 2019

Chemistry A European J

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With the ultimate goal of simultaneously finding cost‐effective, more earth‐abundant, and high‐performance alternatives to commercial Pt/Pd‐based catalysts for electrocatalysis, this review article highlights advances in the use of perovskite metal oxides as both catalysts and catalyst supports towards the oxygen reduction reaction (ORR) and the methanol oxidation reaction (MOR) within a direct methanol fuel cell (DMFC) configuration. Specifically, perovskite metal oxides are promising as versatile functional replacements for conventional platinum‐group metals, in part because of their excellent ionic conductivity, overall resistance to corrosion, good proton‐transport properties, and potential for interesting acidic surface chemistry, all of which contribute to their high activity and reasonable stability, especially within an alkaline electrolytic environment.

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Ni-substituted LaMnO3 perovskites for ethanol oxidation

Cited by 26 publications

References 63 publications

Band gap modulation of SrTiO₃ upon CO₂ adsorption

Band gap modulation of SrTiO₃ upon CO₂ adsorption

Plasma Oxidation of H2S over Non-stoichiometric LaxMnO3 Perovskite Catalysts in a Dielectric Barrier Discharge Reactor

Nanoscale Perovskites as Catalysts and Supports for Direct Methanol Fuel Cells

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Ni-substituted LaMnO3 perovskites for ethanol oxidation

Cited by 26 publications

References 63 publications

Band gap modulation of SrTiO3 upon CO2 adsorption

Band gap modulation of SrTiO3 upon CO2 adsorption

Plasma Oxidation of H2S over Non-stoichiometric LaxMnO3 Perovskite Catalysts in a Dielectric Barrier Discharge Reactor

Nanoscale Perovskites as Catalysts and Supports for Direct Methanol Fuel Cells

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Band gap modulation of SrTiO₃ upon CO₂ adsorption

Band gap modulation of SrTiO₃ upon CO₂ adsorption