Ordered mesoporous metal oxides for electrochemical applications: correlation between structure, electrical properties and device performance

Celik, Erdogan; Ma, Yanjiao; Brezesinski, Torsten; Elm, Matthias T.

doi:10.1039/d1cp00834j

Cited by 37 publications

(55 citation statements)

References 330 publications

(411 reference statements)

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“…This allows also the exclusion of a large contribution of a surface electrical transport pathway, which is expected to be influenced by the local gas/solid equilibrium. 58 Notwithstanding the complexity of the system, specific information on the effect of the chemical post-treatments can be discussed by considering the trends of the impedance contributions upon HF exposure and Co decoration. The Arrhenius plot for the MF and HiF arcs is depicted in Figure 5d, and the respective activation energies are reported in Table 2.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Tailoring the Transport Properties of Mesoporous Doped Cerium Oxide for Energy Applications

et al. 2021

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Hard-template nanocasted mesoporous cerium oxide possesses a unique combination of thermal stability, high surface area, and short diffusion lengths for mass and gas transport, which makes it relevant for high-temperature catalysis, sensing, and electrochemical applications. Here, we present an in-depth study of a number of mesoporous doped ceria systems, and we assess their fundamental structure and functionalities by complementary transmission electron microscopy imaging and spectroscopy, electron tomography reconstructions, and electrochemical impedance spectroscopy. We employed surface chemical modifications for increasing the ionic conductivity of as-synthesized mesoporous Gd-doped ceria by 2 orders of magnitude, enabling the ionic pathway across mesoporous particles. Complementary bulk doping strategies (by the addition of Pr) result in the easy tuning of the electrical transport mechanisms converting pure ionic mesoporous ceria into a mixed ionic–electronic conductor. The results obtained here are rationalized in light of local charge accumulation and mobility effects, providing a potential tool for engineering transport properties in nanocasted ceria and similar nanostructured materials for use in energy applications in the form of functional composites, infiltrated structures, or catalytic layers.

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Section: ■ Results and Discussionmentioning

confidence: 99%

“…Here, only representative samples (namely, CGO as synthesized and Co-HF-CGO) are shown. This allows also the exclusion of a large contribution of a surface electrical transport pathway, which is expected to be influenced by the local gas/solid equilibrium …”

Section: Results and Discussionmentioning

confidence: 99%

Tailoring the Transport Properties of Mesoporous Doped Cerium Oxide for Energy Applications

et al. 2021

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“…The replication of SBA‐15 silica results in a negative replica with nanowire morphology and a well‐aligned pore structure [4,9] . These features are valuable for investigating the diffusion and mass transport properties in fundamental catalysis research [10] …”

Section: Introductionmentioning

confidence: 98%

“…[4,9] These features are valuable for investigating the diffusion and mass transport properties in fundamental catalysis research. [10] Electrochemical water splitting is the key reaction in the sustainable hydrogen economy and future energy landscape since it could convert and store the intermittent energy generated from renewable energy sources, such as solar cells and windmills, into green hydrogen. [11] The overall electrochemical water splitting process could be divided into two fragments: oxygen evolution reaction (OER) in the anode and hydrogen evolution reaction (HER) in the cathode counterpart.…”

Section: Introductionmentioning

confidence: 99%

Cobalt Oxide Nanowires with Controllable Diameters and Crystal Structures for the Oxygen Evolution Reaction

Budiyanto

Tüysüz

2022

Eur J Inorg Chem

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Herein, mesoporous cobalt oxides with nanowire morphology were size-selectively synthesized via nanocasting and used as a model system to reveal the impact of diameter, pore, and crystal structures toward the alkaline water electrolysis. A range of Co 3 O 4 nanowires with variable diameters was prepared by replication of SBA-15 silica with different degree of interconnectivity and pore sizes. These nanowires could be further transformed to CoO rock-salt structure through a selective reduction process by keeping the initial morphology and textural parameters. The electrocatalytic screening showed that CoO with the smallest nanowire diameter and open pore structure showed superior activity in the electrochemical oxygen evolution reaction (OER) due to the higher amount of available active centers and defect sites. The overpotential to reach 10 mA/cm 2 drops from 392 to 337 mV after reduction of Co 3 O 4 to CoO. An in situ Raman spectroscopy investigation showed that Co 3 O 4 retained its bulk crystalline spinel phase while CoO faced an irreversible phase transformation into a distorted spinel structure after OER.

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“…However, to the best of our knowledge, there are no studies available on the preparation and photocatalytic performance of (non-aqueous) sol–gel derived Fe-doped TiO 2 nanocrystals having a size below 5 nm. It is worth mentioning that apart from photocatalysis, the surface composition of such particles can be tailored toward the fabrication of well-defined mesoporous 34 – 36 or macroporous thin-film electrodes 37 for electrochemical applications 38 , 39 .…”

Section: Introductionmentioning

confidence: 99%

Quasi-homogenous photocatalysis of quantum-sized Fe-doped TiO2 in optically transparent aqueous dispersions

Einert

Hartmann

Smarsly

et al. 2021

Sci Rep

Self Cite

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In this study, the preparation of anatase TiO2 nanocrystals via a facile non-aqueous sol–gel route and their characterization are reported. The 3–4 nm particles are readily dispersable in aqueous media and show excellent photoreactivity in terms of rhodamine B degradation. The catalytic performance can be further increased considerably by doping with iron and UV-light irradiation as a pre-treatment. The effect of surface ligands (blocked adsorption sites, surface defects etc.) on the photoreactivity was thoroughly probed using thermogravimetric analysis combined with mass spectrometry. Photoelectrochemical characterization of thin-film electrodes made from the same TiO2 nanocrystals showed the opposite trend to the catalytic experiments, that is, a strong decrease in photocurrent and quantum efficiency upon doping due to introduction of shallow defect states.

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Ordered mesoporous metal oxides for electrochemical applications: correlation between structure, electrical properties and device performance

Abstract: Ordered mesoporous metal oxides with a high specific surface area, tailored porosity and engineered interfaces are promising materials for electrochemical applications. Especially the method of evaporation-induced self-assembly allows the formation...

Cited by 37 publications

References 330 publications

Tailoring the Transport Properties of Mesoporous Doped Cerium Oxide for Energy Applications

Tailoring the Transport Properties of Mesoporous Doped Cerium Oxide for Energy Applications

Cobalt Oxide Nanowires with Controllable Diameters and Crystal Structures for the Oxygen Evolution Reaction

Quasi-homogenous photocatalysis of quantum-sized Fe-doped TiO2 in optically transparent aqueous dispersions

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