Article
Materials Science, Ceramics
V. L. Arantes, J. Sakihama, J. Vleugels
Summary: In this study, a Functionally Graded Material (FGM) with high hardness up to 25.1 GPa and good fracture toughness was successfully produced by using step graded Al2O3/NbC composites consolidated by Spark Plasma Sintering (SPS). The designed compositional gradient was maintained after sintering, resulting in fully dense crack-free graded bodies.
CERAMICS INTERNATIONAL
(2021)
Article
Crystallography
Doaa Omar A. Ali, Marco Fabbiani, Loic Coulomb, Simon Bosc, Benjamin Villeroy, Camille Estournes, Claude Estournes, Michael Marek Koza, Mickael Beaudhuin, Romain Viennois
Summary: We propose a new reactive spark plasma sintering (RSPS) technique to synthesize the rhombohedral Ca14Si19 phase. The RSPS approach significantly reduces the synthesis time to a few minutes. Through electrical resistivity measurements, we determine the energy band gap of Ca14Si19 to be Eg = 0.145(15) eV. The Seebeck coefficient indicates Ca14Si19 as a room temperature p-type semiconductor, but it becomes n-type with increasing temperature due to the compound's narrow bandgap.
Article
Materials Science, Ceramics
D. W. Zhang, Y. Zhang, Y. F. Cai, B. W. Zang, F. Zhao, Y. C. Wang, R. Umetsu, Z. Z. Li, X. Tong, J. T. Huo, S. L. Che, J. Q. Wang
Summary: Amorphous powder compacts of Fe77.7Si8B10P4Cu0.3 with high relative density (rho r = 94%), high saturated magnetic induction (Bs = 1.34 T), and high permeability (mu = 163 at 20 kHz) were fabricated by spark plasma sintering. Fe77.7Si8B10P4Cu0.3 spherical amorphous powders with good amorphous forming ability were prepared by regulating the material composition and the particle size distribution using gas atomization.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Ceramics
Jose Sanchez del Rio, Alicia Paez-Pavon, Jose M. Torralba, Dariusz Garbiec, Jose S. Moya, Sonia Lopez-Esteban, Carlos Pecharroman
Summary: The feasibility of sintering Portland cement clinker powders by Spark Plasma Sintering (SPS) has been studied. Different SPSed compacts have been successfully obtained by this technique. The compacts have been characterized and it is found that slight mineralogical variations in the starting compositions may induce dramatic changes in the final mineralogical composition and morphology, affecting the properties of the SPSed compacts. The emergence of two transitory eutectic liquids is explained in a new model describing the formation of garnets, which allows for the creation of artificial garnets in the laboratory by applying low pressures, opening the door to compositions for specific applications with high added value.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Yiteng Xing, Pierre Bernstein, Muralidhar Miryala, Jacques G. Noudem
Summary: In this study, in situ MgB2 superconducting samples were prepared using the spark plasma sintering method. The samples exhibited high critical current densities and strong vortex pinning ability, which can be attributed to the sample density and the presence of MgB2 nanograins in connection to MgO precipitates and areas rich in boron.
Article
Chemistry, Physical
Ahmed A. Abdelnabi, Vickram Lakhian, Joseph R. McDermid, Yu-Chih Tseng, James S. Cotton
Summary: This study determined key mechanical design parameters and thermoelectric performance of P-type Bi0.4Sb1.6Te3 material, indicating significant improvement in mechanical properties and thermoelectric properties of sintered samples after reduction treatment of the powder.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Nasrin Heidari, Fatemeh Davar, Amir Alhaji
Summary: In this project, magnesia-alumina composite granules were prepared using the spray drying method and then sintered at temperatures of 1400 degrees C to 1500 degrees C by spark plasma sintering without using any sintering aids. The study focused on the effects of sintering temperature on the phase evolution, density, fracture toughness, and light transmission properties of the samples. Results showed that the sample sintered at 1400 degrees C had better transparency and higher density, hardness, and fracture toughness compared to the sample sintered at 1500 degrees C.
CERAMICS INTERNATIONAL
(2022)
Review
Chemistry, Multidisciplinary
M. Somasundaram, Narendra Kumar Uttamchand, A. Raja Annamalai, Chun-Ping Jen
Summary: This review paper focuses on the microstructural, mechanical, biological, and corrosion resistance properties of spark plasma sintered magnesium (Mg) composites. Various researchers have optimized the composition, processing techniques, and surface modifications to overcome the issue of oxidation. The reinforcement material affects the mechanical properties and corrosion resistance of Mg composites. Further research is needed on the impact of process parameters on the quality of Mg composites.
Article
Materials Science, Ceramics
Alexandre Margueret, Luca Balice, Karin Popa, Michael Holzhaeuser, Emanuele De Bona, Walter Bonani, Antonio Bulgheroni, Fabienne Audubert, Marco Cologna
Summary: We analyzed the densification of UO2 nanopowders in SPS under different conditions and found that the apparent activation energy of densification in SPS is smaller than that in conventional sintering. We also observed a threshold stress for the transition from pressure-insensitive sintering to pressure-assisted sintering.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Luca Balice, Marco Cologna, Fabienne Audubert, Jean-Louis Hazemann
Summary: A direct method for calculating the apparent activation energy and stress exponent in the sintering of UO2 was proposed, with grain boundary diffusion coupled with grain boundary sliding as the densification mechanism. The activation energy in SPS was found to be lower compared to other processes, possibly due to the effect of the electric field combined with higher heating rates.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
F. Giovannelli, E. Sabarthes, F. Delorme
Summary: In this study, spark plasma sintering was used to prepare dense ceramics of La7Mo7O30 from La2Mo2O9 powder and investigate their thermoelectric properties. The experimental results show that La2Mo2O9 was reduced to La7Mo7O30 during the SPS process. The obtained La7Mo7O30 ceramic exhibits semiconducting behavior with a high electrical conductivity at 1000 K and a very low thermal conductivity throughout the temperature range from room temperature to 1000 K. The figure of merit reached 0.04 at 1000 K.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Damiano Angioni, Roberto Orru, Giacomo Cao, Sebastiano Garroni, Pier Carlo Ricci, Khachatur V. Manukyan
Summary: A processing route combining Solution Combustion Synthesis (SCS) and Spark Plasma Sintering (SPS) was proposed for the fabrication of bulk nanostructured biphasic calcium phosphates. The apatite phase content was maximized using SCS with a fuel to oxidizer ratio of 1.1. After air-annealing at 700 degrees C/3 h, the powders consisted of carbonated apatite, α-TCP, and β-TCP. Sintering at 900 degrees C retained the original nanostructure, resulting in nearly 91% dense, apatite-rich, biphasic bioceramics with grain size around 100 nm.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Penghui Li, Mengdong Ma, Yingju Wu, Xiang Zhang, Yukai Chang, Zewen Zhuge, Lei Sun, Wentao Hu, Dongli Yu, Bo Xu, Zhisheng Zhao, Junyun Chen, Julong He, Yongjun Tian
Summary: By using nano-sized powders and SPS technology, high-density B4C ceramics were prepared with enhanced mechanical properties. Under the optimal SPS condition, the sample exhibited improved Vickers hardness, fracture toughness, and flexure strength.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
L. Audouard, M. G. Tsoutsouva, N. Horezan, E. Rimpot, J. F. Justin, P. Bertrand, C. Langlade, M. Garcia, A. Julian-Jankowiak
Summary: This study investigated the Spark Plasma Sintering (SPS) of fully stabilised hafnia with yttrium oxide (yttria) and examined the influence of manufacturing parameters on the crystallography, chemistry, and microstructure of the material. It was found that both the amount of yttria and the sintering temperature affected the final composition, lattice parameter, and microstructure of hafnia-based materials. Regardless of the amount of yttrium employed, the main phase was determined to be Y2Hf2O7 with high densification levels.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Hua-Lu Zhuang, Jun Pei, Bowen Cai, Jinfeng Dong, Haihua Hu, Fu-Hua Sun, Yu Pan, Gerald Jeffrey Snyder, Jing-Feng Li
Summary: The study emphasizes the importance of the synthesis process for achieving high performance in Bi2Te3-based thermoelectric materials. By applying cyclic spark plasma liquid phase sintering, a unique microstructure with enlarged grains and abundant nanostructures can be formed, leading to high charge carrier mobility and low lattice thermal conductivity. This results in a significantly higher ZT value compared to conventionally spark-plasma-sintered materials.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Hayoung Im, Sunihl Ma, Hyungsoo Lee, Jaemin Park, Young Sun Park, Juwon Yun, Jeongyoub Lee, Subin Moon, Jooho Moon
Summary: Chiral inorganic materials have shown promise in improving the efficiency of solar-to-hydrogen conversion in water-splitting devices due to their spin control capability and catalytic activity. However, a rational design for these materials in photoelectrochemical water-splitting is lacking. In this study, we investigated chirality transfer phenomena at the molecular level and found that chiral ligand molecules exhibit direction-dependent dimer interactions in the precursor solution, affecting chirality transfer and material quality. Based on this understanding, we successfully fabricated a chiral inorganic material-based water-splitting device with outstanding oxygen evolution reaction performance, demonstrating the great potential of chirality-induced spin-selectivity in the water-splitting process.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Multidisciplinary Sciences
Sang Eon Jun, Youn-Hye Kim, Jaehyun Kim, Woo Seok Cheon, Sungkyun Choi, Jinwook Yang, Hoonkee Park, Hyungsoo Lee, Sun Hwa Park, Ki Chang Kwon, Jooho Moon, Soo-Hyun Kim, Ho Won Jang
Summary: This study demonstrates the decoration of iridium single atoms (SAs) on silicon photoanodes, and assesses their role in separating and transferring photogenerated charge carriers. By embedding the iridium SAs in a NiO/Ni thin film, a benchmarking photoelectrochemical performance is achieved with high photocurrent density and stability. This research provides insights into the rational design of SAs on silicon photoelectrodes and the potential of iridium SAs in boosting photogenerated charge carrier kinetics.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Subin Moon, Jaemin Park, Hyungsoo Lee, Jin Wook Yang, Juwon Yun, Young Sun Park, Jeongyoub Lee, Hayoung Im, Ho Won Jang, Wooseok Yang, Jooho Moon
Summary: In order to achieve practical solar hydrogen production, a low-cost photocathode with high photocurrent density and onset potential is needed. In this study, an efficient and stable overall photoelectrochemical tandem cell is developed with a Cu3BiS3-based photocathode. The preparation of a Bi2S3-Cu3BiS3 blended interlayer using a one-step solution process with two sulfur sources is found to enhance the performance of the Cu3BiS3 thin-film photocathode. The resulting solar-to-hydrogen efficiency is 2.33% with excellent stability exceeding 21 hours.
Article
Chemistry, Multidisciplinary
Minseok Song, Eunji Eom, Jae Won Shin, Hae Sung Cho, Jeong-Chul Kim, Changbum Jo
Summary: We present a general synthetic approach for encapsulating metal nanoparticles within preformed zeolites using post-synthetic modification. The encapsulation process involves supporting anionic or cationic precursors onto the zeolite framework using a bi-grafting agent, resulting in the formation of small and uniform nanoparticles. The encapsulation provides protection against thermal sintering and coke fouling, leading to high catalytic performance in hydroisomerization and methane decomposition.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Hyungsoo Lee, Sunihl Ma, Seungtae Oh, Jeiwan Tan, Chan Uk Lee, Jaehyun Son, Young Sun Park, Juwon Yun, Gyumin Jang, Jooho Moon
Summary: The use of chiral 2D organic-inorganic hybrid perovskites as a spin-filtering layer on the photoanode can enhance the oxygen evolution performance in photoelectrochemical water-splitting systems. This device achieves a reduced overpotential, increased photocurrent, and excellent operational stability.
Article
Chemistry, Multidisciplinary
Jaemin Park, Junwoo Lee, Hyungsoo Lee, Hayoung Im, Subin Moon, Chang-Seop Jeong, Wooseok Yang, Jooho Moon
Summary: A wireless solar water splitting device allows for an inexpensive and distributed solar-to-fuel system. This device utilizes a highly efficient hydrogen-generating artificial leaf that integrates a hybrid perovskite as the light absorber with catalysts for electrochemical reaction. The device achieves a high photocurrent density and solar to hydrogen efficiency, demonstrating the effectiveness of its design.
Article
Chemistry, Physical
Young Sun Park, Juwon Lee, Hyungsoo Lee, Juwon Yun, Gyumin Jang, Jeongyoub Lee, Sanguk Son, Chan Uk Lee, Chang-Seop Jeong, Subin Moon, Soobin Lee, Hyoung-il Kim, Jooho Moon
Summary: The lack of efficient photoanodes is a major challenge for unbiased solar-to-fuel conversion. In this study, solution-processed Sb2S3 nanorod arrays with improved optoelectronic properties and crystallographic orientation were obtained. Surface treatment with (NH4)(2)WS4 passivated the sulfur vacancy of Sb2S3 and enhanced charge extraction. An efficient hydrogen generation device was demonstrated using an Sb2S3 nanorod array-based photoanode for iodide oxidation and a perovskite-based photocathode, achieving a hydrogen production current density of 5.7 mA cm(-2) without external bias.
ADVANCED ENERGY MATERIALS
(2023)
Editorial Material
Nanoscience & Nanotechnology
Jeanne Crassous, Matthew J. Fuchter, Danna E. Freedman, Nicholas A. Kotov, Jooho Moon, Matthew C. Beard, Sascha Feldmann
Summary: Solution-processable semiconductors based on small molecules, polymers or halide perovskites combine sustainable manufacturing with exceptional optoelectronic properties that can be chemically tailored to achieve flexible and highly efficient optoelectronic and photonic devices. A new exciting research direction is the study of the influence of chirality on light-matter interactions in these soft materials and its exploitation for the simultaneous control of charge, spin and light. In this Viewpoint, researchers working on different types of chiral semiconductors discuss the most interesting directions in this rapidly expanding field.
NATURE REVIEWS MATERIALS
(2023)
Article
Chemistry, Physical
Young Sun Park, Gyumin Jang, Inkyu Sohn, Hyungsoo Lee, Jeiwan Tan, Juwon Yun, Sunihl Ma, Jeongyoub Lee, Chan Uk Lee, Subin Moon, Hayoung Im, Seung-Min Chung, Seungho Yu, Hyungjun Kim, Jooho Moon
Summary: In this study, a highly efficient and durable electrocatalyst - molybdenum disulfide (MoS2) was reported for iodide oxidation reaction (IOR). MoS2 nanosheets deposited on a porous carbon paper via atomic layer deposition exhibited good oxidation reaction current density and long-term stability. A two-electrode system consisting of the MoS2 anode and a commercial Pt@C cathode was fabricated for hydrogen evolution reaction in water splitting. Furthermore, a photovoltaic-electrochemical hydrogen production device comprising this electrolyzer and a single perovskite photovoltaic cell achieved a high current density for hydrogen production.
Article
Materials Science, Ceramics
Hye-Won Kim, Hyeon Jin Kim, Kyong Sik Yun, Dong-Hyun Peck, Jooho Moon, Ji Haeng Yu
Summary: In this study, aperture-type limiting current sensors based on LSM-YSZ and LSM-CGO-YSZ composites were fabricated and evaluated for O2 and CO sensing. The LSM-CGO-YSZ composite electrodes exhibited higher limiting current values than the commercial Pt and LSM-YSZ electrodes in both O2 and CO atmospheres.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Applied
Jeongyoub Lee, Changhoon Choi, Jung Been Park, Seungho Yu, Jinho Ha, Hyungsoo Lee, Gyumin Jang, Young Sun Park, Juwon Yun, Hayoung Im, Subin Moon, Soobin Lee, Jung-Il Choi, Dong-Wan Kim, Jooho Moon
Summary: Heterostructure engineering with rational design of structure and interface contacts can effectively capture soluble lithium polysulfide intermediates and promote their conversion reactions. TiO2@MoS2 heterostructures on carbon cloth show high rate capability, good cycling stability, and satisfactory areal capacity in Li-S batteries under increased sulfur loading. The effect of the built-in electric field's direction on electrocatalytic reactions of polysulfide intermediates is thoroughly investigated, and the rationally arranged TiO2@MoS2 interlayer demonstrates superior electrocatalytic activities, highlighting the importance of optimizing the built-in electric field for high-performance Li-S batteries.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Chemistry, Physical
Sungkyun Choi, Sol A. Lee, Jin Wook Yang, Woonbae Sohn, Jaehyun Kim, Woo Seok Cheon, Jaemin Park, Jin Hyuk Cho, Chung Won Lee, Sang Eon Jun, Sung Hyuk Park, Jooho Moon, Soo Young Kim, Ho Won Jang
Summary: Designing an appropriate catalyst for photoelectrochemical water splitting is crucial for efficient solar to hydrogen energy production. Introducing small amounts of noble metals, such as Au, into transition metal-based materials can enhance the efficiency of solar water oxidation.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Optics
Gyumin Jang, Hyowon Han, Sunihl Ma, Junwoo Lee, Chan Uk Lee, Wooyong Jeong, Jaehyun Son, Dongki Cho, Ji-Hee Kim, Cheolmin Park, Jooho Moon
Summary: A rapid crystallization method based on hot-antisolvent bathing is proposed to obtain phase-pure two-dimensional Ruddlesden-Popper perovskite films for deep-blue PeLEDs. The developed PeLEDs demonstrate high performance with a peak EQE of 0.63% and excellent spectral stability, matching well with the Rec.2020 standard blue gamut.
ADVANCED PHOTONICS
(2023)
Article
Multidisciplinary Sciences
Kangah Park, Minsu Cho, Minseok Song, Sooyoung Yoo, Hyunyoung Baek, Seok Kim, Kidong Kim
Summary: This paper presents a method to extract, construct, and analyze event logs from the Observational Medical Outcomes Partnership (OMOP) CDM for process mining in healthcare. The results show that CDM is a valuable data source for healthcare process analysis, but may require additional data sources for certain analyses.
Article
Chemistry, Physical
Mi Gyoung Lee, Jin Wook Yang, Ik Jae Park, Tae Hyung Lee, Hoonkee Park, Woo Seok Cheon, Sol A. Lee, Hyungsoo Lee, Su Geun Ji, Jun Min Suh, Jooho Moon, Jin Young Kim, Ho Won Jang
Summary: The introduction of indium oxide nanorods as an electron transport layer enhances the photoelectrochemical performance of bismuth vanadate. A tannin-nickel-iron complex is used as an oxygen evolution catalyst to accelerate the reaction kinetics. The fabricated TANF/BiVO4/In2O3 NR photoanode exhibits improved photoactivity with high photocurrent densities.
