A5018198374- Advancements in Solid Oxide Fuel Cells
- Electronic and Structural Properties of Oxides
- Semiconductor materials and devices
- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Catalytic Processes in Materials Science
- Ferroelectric and Piezoelectric Materials
- Catalysis and Oxidation Reactions
- Ferroelectric and Negative Capacitance Devices
- Graphene research and applications
- Magnetic and transport properties of perovskites and related materials
- ZnO doping and properties
- Nuclear Materials and Properties
- Thermal properties of materials
- Advanced Memory and Neural Computing
- Ion-surface interactions and analysis
- Diamond and Carbon-based Materials Research
- Advanced Sensor and Energy Harvesting Materials
- Electrochemical Analysis and Applications
- Metal and Thin Film Mechanics
- Machine Learning in Materials Science
- Perovskite Materials and Applications
- Supercapacitor Materials and Fabrication
- Photonic Crystals and Applications
- Copper Interconnects and Reliability
Seoul National University of Science and Technology
2015-2024
Pohang University of Science and Technology
2023-2024
Government of the Republic of Korea
2018
Stanford University
2009-2018
Seoul Institute
2018
Samford University
2014
Obtaining high power density at low operating temperatures has been an ongoing challenge in solid oxide fuel cells (SOFC), which are efficient engines to generate electrical energy from fuels. Here we report successful demonstration of a thin-film three-dimensional (3-D) SOFC architecture achieving peak 1.3 W/cm(2) obtained 450 °C. This is made possible by nanostructuring the ultrathin (60 nm) electrolyte interposed with nanogranular catalytic interlayer cathode/electrolyte interface. We...
Structural and microstructural properties as well the fuel cell performance of anhydrous proton conducting yttria-doped barium zirconate (BYZ) membranes were investigated. The nominally about 100 nm thick fabricated by both atomic layer deposition (ALD) pulsed laser (PLD) techniques on micromachined Si substrates. Electrochemical cells (H2, Pt/BYZ/Pt, air) using porous platinum electrodes deposited sputtering. tested in temperature regime 200−450 °C. Power densities 136 mW/cm2 at 400 °C...
This feature article provides a progress review of atomic layer deposition (ALD) for fabrication oxide-ion as well proton conducting ceramic fuel cells. A comprehensive analysis structural, chemical, surface kinetics, and electrochemical characterization results ALD membranes is also presented. reaction limited method depositing conformal, high quality, pinhole-free, uniform thickness nanofilms onto planar or three-dimensional structures. Deposition by one at time affords unprecedented...
This study presents atomic scale characterization of grain boundary defect structure in a functional oxide with implications for wide range electrochemical and electronic behavior. Indeed, engineering can alter transport kinetic properties by several orders magnitude. Here we report experimental observation determination oxide-ion vacancy concentration near the Σ13 (510)/[001] symmetric tilt grain-boundary YSZ bicrystal using aberration-corrected TEM operated under negative spherical...
Obtaining a catalyst with high activity and thermal stability is essential for high-performance energy conversion devices operating at an elevated temperature. Herein, the design fabrication of heterogeneous ultrathin CeO2 overlayer via atomic layer deposition (ALD) on Pt electrodes low-temperature solid oxide fuel cells (LT-SOFCs) reported. The cell CeO2-overcoated (five ALD cycles) cathode shows lower activation resistance by 50% after 10 h operation higher factor 2 compared Pt-only...
Although laminate structures are widely used in electrostatic capacitors, unavoidable heterogeneous interfaces often deteriorate the dielectric properties by impeding film crystallization. In this study, a TiO2/ZrO2/TiO2 (TZT) structure, where upper-TiO2 deposited on interface was crystallized plasma-assisted atomic layer annealing (ALA), investigated. ALA effectively induced phase transition of from amorphous or anatase to rutile phase, leading an increase constant, whereas ZrO2 blocking...
Because noble metal catalysts (e.g. Pt) are one of the main contributors to low-temperature (<500 °C) fuel cell costs, significant efforts have been made lower loading in constructing electrodes. In this work, ultra-thin (∼10 nm) platinum (Pt) cathode/catalyst layers were patterned by atomic layer deposition (ALD) and tested as catalytic electrodes (cathode) for solid oxide cells. We found that 180 cycles or approximately 10 nm ALD Pt, with a Pt only 0.02 mg cm(-2), sufficient purpose...
The AAO-supported thin-film SOFC with a sputtered-SDC/ALD–YSZ/sputtered-SDC sandwich electrolyte shows high maximum power density of 562 mW cm<sup>−2</sup> at 450 °C.
High-k, low leakage thin films are crucial components for dynamic random access memory (DRAM) capacitors with high storage density and a long lifetime. In this work, we demonstrate method to increase the dielectric constant decrease current of atomic layer deposited BaTiO3 at process temperature (250 °C) using postdeposition remote oxygen plasma treatment. The increased from 51 (as-deposited) 122 (plasma-treated), decreased by 1 order magnitude. We ascribe such improvements crystallization...
An ultrathin yttria-stabilized zirconia (YSZ) blocking layer deposited by atomic deposition (ALD) was utilized for improving the performance and reliability of low-temperature solid oxide fuel cells (SOFCs) supported an anodic aluminum substrate. Physical vapor-deposited YSZ gadolinia-doped ceria (GDC) electrolyte layers were a sputtering method. The ALD inserted between GDC sputtered layers. To investigate effects layer, SOFCs with without electrochemically characterized. open circuit...
Nickel and ruthenium bimetallic catalysts were heterogeneously synthesized via atomic layer deposition (ALD) for use as the anode of direct methanol solid oxide fuel cells (DMSOFCs) operating in a low-temperature range. The presence highly dispersed ALD Ru islands over porous Ni mesh was confirmed, Ni/ALD microstructure observed. Fuel cell tests conducted using Ni-only anodes with approximately 350 μm thick gadolinium-doped ceria electrolytes platinum cathodes. performance assessed pure at...