Surface Tuning of Solid Oxide Fuel Cell Cathode by Atomic Layer Deposition

Choi, Hyung Jong; Bae, Kwang‐Hee; Grieshammer, Steffen; Han, Gwon Deok; Park, Suk Won; Kim, Jun Woo; Jang, Dong Kee; Koo, Jae Mean; Son, Ji‐Won; Martin, Manfred; Shim, Joon Hyung

doi:10.1002/aenm.201802506

Cited by 50 publications

(34 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a recent report by Choi et al they, for the first time, deposited ALD LSC by mixing LaO, SrO, and CoO x processes on a LSCF cathode. ( figure 5(g)) Impressively, the ALD LSC overlayer with the optimal thickness of 8 nm can enhance charge transfer kinetics at the surface of the cathode and also greatly improve the power density by 80%, which corroborated well with density functional theory (DFT) simulations ( figure 5(h)) [41].…”

Section: Cathodesupporting

confidence: 70%

“…The application of the ALD layer for perovskite oxide electrodes, which are widely used electrode materials in SOFCs, has been reported by several groups [22,34,35,[37][38][39][40][41][42][43]. The fabrication of an ALD-processed perovskite oxide electrode, e.g., (La,Sr)MnO x (LSM), as well as the coating of a thin ALD layer on perovskite oxide electrode surfaces to improve the surface activity and the thermal stability have been reported.…”

Section: Effect On Electrode Performancementioning

confidence: 99%

“…Notably, they also enhance the thermal stability or impede the thermal degradation by a few times [28,32] or even up to a couple of orders [26]. 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%

“…In this review, recent reports on the application of ALD nanostructures in SOFCs will be reviewed and discussed in the aspect of the process-structure-performance relationship . While ALD nanostructures have mostly been used in LT-SOFCs due to their reduced mechanical/chemical stabilities at elevated temperatures, several reports have shown their successful incorporation in SOFCs operating at intermediate-to high-temperature regimes [34,35,[37][38][39][40][41]. Before reviewing the examples of applications in section 3, we will first revisit the fundamentals of SOFC and ALD in section 2.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Shin

Kye

et al. 2019

J. Phys. Energy

View full text Add to dashboard Cite

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

show abstract

Section: Cathodesupporting

confidence: 70%

Section: Effect On Electrode Performancementioning

confidence: 99%

Section: Quantitative Comparison In Performance Enhancementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Shin

Kye

et al. 2019

J. Phys. Energy

View full text Add to dashboard Cite

show abstract

“…In recent years computational methods have been employed to find better materials, for example by correlating O p-band centre with catalytic activity, then calculating this for new compositions, along with stability (figure 4a) 51 , or by computationally combining known modules of crystal structures in new ways to predict complex layered structures with favourable properties (figure 4b) 52 . With advances in creating nanoscale layers, for example by atomic layer deposition, there have been efforts to separate the electrocatalytic function from the conduction by depositing an electrocatalytically active thin film on a conductive bulk (figure 4c) 53,54 . These efforts are at an early stage and it could be that large advances in activity for the oxygen reduction reaction are possible.…”

Section: Increasing Power Densitymentioning

confidence: 99%

Progress and outlook for solid oxide fuel cells for transportation applications

2019

View full text Add to dashboard Cite

With their high temperatures and brittle ceramic components, solid oxide fuel cells (SOFCs) might not seem the obvious fit for a power source for transportation applications. However, over recent years advances in materials and cell design have begun to mitigate these issues, leading to the advantages of SOFCs such as fuel flexibility and high efficiency being exploited in vehicles. Here we review the advances in SOFC technology which have led to this, look at the vehicles that SOFCs have already been used in, and discuss the areas which need improvement for full commercial breakthrough, and the ways in which catalysis science can assist with these. In particular we identify lifetime and degradation, fuel flexibility, efficiency and power density for improvement, and areas of catalysis science ranging from surface science and computational materials design to improvements in reforming catalysts and reformer design as key to this. MainDecarbonising transport is one of the largest challenges in the global response to climate change. Globally, transport is responsible for 23% of emissions and currently relies on hydrocarbons for 92% of its energy 1 . Decarbonisation is particularly difficult for transportation, because one of the key requirements for the energy source is portability, and hydrocarbons are one of the most energy dense substances available. In addition, the public health burden from pollutants such as particulates, nitrogen oxides and sulfur oxides emitted by vehicles is large, so cleaner energy sources are required.Efforts in transportation have focussed on batteries and polymer electrolyte fuel cells (PEFCs) running on hydrogen, alongside efficiency improvements and fuel switching. Although over the last decade batteries have been the dominant technology because they have advantages over fuel cells in manufacturing, cost, responsiveness in a vehicle and availability of supporting infrastructure, in the longer-term fuel cells may have advantages in some areas. The clearest advantage of fuel cells is high energy density, where it's not known whether battery technology will ever advance far enough to power long-distance transportation such as ships or intercontinental flights. In the area of passenger vehicles, with high battery vehicle penetration, much of the local grid infrastructure such as substations may not be able to cope and may have to be replaced -it is not clear at the moment whether this will be more expensive and disruptive than the rollout of the hydrogen-fuelling network which would be needed to support fuel cell vehicles. In applications such as buses where fast charging/refuelling is needed, fuel cells also possess an innate advantage. Finally, the wider advantage of switching to a hydrogen-fuelled transportation system is that electrolysers can be used to smooth the intermittent supply from renewable energy, while at the same time producing hydrogen fuel for vehicles.One technology which was until relatively recently deemed unsuitable for transportation, but nevertheless has unique ad...

show abstract

Progress Report on Proton Conducting Solid Oxide Electrolysis Cells

Lei

Zhang

Yuan

et al. 2019

Adv Funct Materials

140

114

View full text Add to dashboard Cite

The proton-conducting solid oxide electrolysis cell (H-SOEC) is a promising device that converts electrical energy to chemical energy. H-SOECs have been actively studied in the past few years, due to their advantages over oxygen-ion-conducting solid oxide electrolysis cells (O-SOECs), such as lower operation temperature, relatively lower activation energy, and easier gas separation. A critical overview of recent progress in H-SOECs is presented, focusing particularly on the period from 2014-2018. This review focuses on three aspects of H-SOECs, namely the materials, modeling and current leakage in proton conducting oxide electrolytes. Specifically, the current leakage in proton conducting oxides, which is often neglected, leads to two problems in the studies of H-SOECs. One is the distortion of the electrochemical impedance spectra (EIS) and the other is low faradaic efficiency of electrolysis. Based on the comprehensive and critical discussion in these three sections, challenges in the development of H-SOECs are highlighted and prospective research in H-SOECs is outlined.Received: ((will be filled in by the editorial staff))Revised: ((will be filled in by the editorial staff))

show abstract

Surface Tuning of Solid Oxide Fuel Cell Cathode by Atomic Layer Deposition

Cited by 50 publications

References 51 publications

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

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

Progress and outlook for solid oxide fuel cells for transportation applications

Progress Report on Proton Conducting Solid Oxide Electrolysis Cells

Contact Info

Product

Resources

About