Atomic layer deposition of ruthenium surface-coating on porous platinum catalysts for high-performance direct ethanol solid oxide fuel cells

Jeong, Heonjae; Kim, Jun Woo; Jang, Dong Kee; Shim, Joon Hyung

doi:10.1016/j.jpowsour.2015.05.005

Cited by 35 publications

(25 citation statements)

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“…The power density of Pt with ALD Ru (2 nm) is ∼6 times higher than that with only Pt anode. Additionally, ALD Ru suppressed carbon formation in an ethanol oxidation environment as well [153]. Table 2 summarizes the improvements in various performance metrics (ionic conductivity, exchange current density, OCV, ohmic/activation resistance, maximum power density (MPD)) depending on the components where the ALD technique is applied.…”

Section: Anodementioning

confidence: 99%

“…ALD oxide overlayers such as CoO x or LSC on perovskite cathodes also help to reduce the activation resistance (by a factor of 1.3-2.2), and enhance the MPD (by a factor of 1.6-1.8) [41,42]. ALD precious metal overlayers (Ru) on SOFC anodes operating directly with alcohol fuels not only improve the activation process and enhance the MPD, but also significantly stabilize the anode, which seems to be partly due to better coking resistance [151][152][153].…”

Section: Quantitative Comparison In Performance Enhancementmentioning

confidence: 99%

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Review on process-microstructure-performance relationship in ALD-engineered SOFCs

Shin

Kye

et al. 2019

J. Phys. Energy

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Solid oxide fuel cells (SOFCs) are promising candidates for next-generation energy conversion devices, and much effort has been made to lower their operating temperature for wider applicability. Recently, atomic layer deposition (ALD), a novel variant of chemical vapor deposition, has demonstrated interesting research opportunities for SOFCs due to its unique features such as conformality and precise thickness/doping controllability. Individual components of SOFCs, namely the electrolyte, electrolyte-electrode interface, and electrode, can be effectively engineered by ALD nanostructures to yield higher performance and better stability. While the particulate or porous structures may benefit the electrode performance by maximizing the surface area, the dense film effectively blocks the chemical or physical shorting even at nanoscale thickness when applied to the electrolyte, which helps to increase the performance at low operating temperature. In this article, recent examples of the application of ALD-processed nanostructures to SOFCs are reviewed, and the quantitative relationship between ALD process, ALD nanostructure and the performance and stability of SOFCs is elucidated. Abbreviations

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Section: Anodementioning

confidence: 99%

Section: Quantitative Comparison In Performance Enhancementmentioning

confidence: 99%

Review on process-microstructure-performance relationship in ALD-engineered SOFCs

Shin

Kye

et al. 2019

J. Phys. Energy

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“…This feature is especially attractive for the synthesis of heterostructured materials used in catalysis and nanodevices [362][363][364][365]. The ALD has also been explored as an alternative method for the preparation of advanced heterostructured and core-shell-structured electrocatalysts, such as Pd@Pt and Ni@Pt [368,374,[377][378][379][380]. For example, Cao et al [366] synthesized uniform Pd@Pt core-shell-structured electrocatalysts using the ALD technique with ODTS self-assembled monolayers as substrates (Fig.…”

Section: Principles and Development Of Atom Layer Depositionmentioning

confidence: 99%

Core–Shell-Structured Low-Platinum Electrocatalysts for Fuel Cell Applications

Wang

Luo

et al. 2018

Electrochem. Energ. Rev.

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Pt-based catalysts are the most efficient catalysts for low-temperature fuel cells. However, commercialization is impeded by prohibitively high costs and scarcity. One of the most effective strategies to reduce Pt loading is to deposit a monolayer or a few layers of Pt over other metal cores to form core-shell-structured electrocatalysts. In core-shell-structured electrocatalysts, the compositions of the core can be divided into five classes: single-precious metallic cores represented by Pd, Ru, and Au; singlenon-precious metallic cores represented by Cu, Ni, Co, and Fe; alloy cores containing 3d, 4d or 5d metals; and carbide and nitride cores. Of these, researchers have found that carbide and nitride cores can yield tremendous advantages over alloy cores in terms of cost and promotional activities of Pt shells. In addition, desirable shells with reasonable thicknesses and compositions have been recognized to play a dominant role in electrocatalytic performances. And recently, researchers have also found that the catalytic activity of core-shell-structured catalysts is dependent on the binding energy of the adsorbents, which is determined by the d-band center of Pt. The shifting of this d-band center in turn is mainly affected by strain and electronic effects, which can be adjusted by adjusting core compositions and shell thicknesses of catalysts. In the development of these core-shell structures, optimal synthesis methods are of primary concern because they directly determine the practical application potential of the resulting electrocatalysts. And in this article, the principles behind core-shell-structured low-Pt electrocatalysts and the developmental progresses of various synthesis methods along with the traits of each type of core and its effects on Pt shell catalytic activities are discussed. In addition, perspectives on this type of catalyst are discussed and future research directions are proposed.

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“…Porous materials with precisely controlled properties, such as pore size and diameter, have several applications in, for instance, filtration [1], gas sensing [2,3], catalysis [4], photocatalysis [5,6], solar cells [7], adsorption [8,9], and biomedical research [10]. Microchannel plates (MCPs) are special member of these materials, in which a porous membrane is composed of parallelly aligned or crossing tubes.…”

Section: Introductionmentioning

confidence: 99%

“…The electronic energy loss can be well described by the Bethe-Bloch formula and the SRIM software [13]. The incident ion induces ionization and electric 4 excitation, which in polymers predominantly breaks chemical bonds and a damaged ion track forms.…”

Section: Introductionmentioning

confidence: 99%

Coating and functionalization of high density ion track structures by atomic layer deposition

Mättö

Szilágyi

Laitinen

et al. 2016

Nuclear Instruments and Methods in Physics Research Section A:

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In this study flexible TiO 2 coated porous Kapton membranes are presented having electron multiplication properties. 800 nm crossing pores were fabricated into 50 m thick Kapton membranes using ion track technology and chemical etching. Consecutively, 50 nm TiO 2 films were deposited into the pores of the Kapton membranes by atomic layer deposition using Ti( i OPr) 4 and water as precursors at 250 °C. The TiO 2 films and coated membranes were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray reflectometry (XRR). Au metal electrode fabrication onto both sides of the coated foils was achieved by electron beam evaporation. The electron multipliers were obtained by joining 3 two coated membranes separated by a conductive spacer. The results show that electron multiplication can be achieved using ALD-coated flexible ion track polymer foils.

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Atomic layer deposition of ruthenium surface-coating on porous platinum catalysts for high-performance direct ethanol solid oxide fuel cells

Cited by 35 publications

References 50 publications

Review on process-microstructure-performance relationship in ALD-engineered SOFCs

Review on process-microstructure-performance relationship in ALD-engineered SOFCs

Core–Shell-Structured Low-Platinum Electrocatalysts for Fuel Cell Applications

Coating and functionalization of high density ion track structures by atomic layer deposition

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