Article
Chemistry, Physical
Taejun Ha, June-Hyung Kim, Changhyo Sun, Dong-Ik Kim, Jin-Yoo Suh, Jae-il Jang, Joonho Lee, Yunseok Kim, Jae-Hyeok Shim
Summary: The effect of Ce addition on the initial hydrogen absorption behavior and microstructural features of AB-type Ti50Fe48V2 hydrogen storage alloys was investigated. Ce addition significantly improved the initial hydrogen absorption kinetics at room temperature, with no significant influence on the pressure-composition isotherms. Fine spherical particles containing Ce were dispersed in the TiFe matrix, and these particles were determined to be gamma-Ce mixed with cerium oxide. Ce particles played a crucial role by providing starting points for initial hydrogenation, explaining the significant increase in primary hydrogen absorption kinetics after Ce addition.
Article
Chemistry, Multidisciplinary
Ou Jin, Yuanyuan Shang, Xiaohui Huang, Xiaoke Mu, Dorothee Vinga Szabo, Thi Thu Le, Stefan Wagner, Christian Kuebel, Claudio Pistidda, Astrid Pundt
Summary: This study investigates the reaction mechanism of LiBH4-MgH2 composite under the influence of additives using transmission electron microscopy. The formation of MgB2, as the rate-limiting step, is found to be related to different nucleation centers. The morphology and performance of MgB2 are affected by the in-plane strain energy density caused by atomic misfit at the interface.
Article
Chemistry, Applied
Weronika Ruminska, Karolina H. Markiewicz, Agnieszka Z. Wilczewska, Agnieszka Nawrocka
Summary: Thermal analyses were used to investigate the effects of five oil pomaces on the thermal properties and transitions in model dough and gluten network. Results showed that there were differences in thermal behavior after supplementing with different pomaces, and the impact of various pomaces on model dough and gluten varied.
Article
Chemistry, Physical
N. A. Sazelee, N. A. Ali, M. S. Yahya, M. F. Md Din, M. Ismail
Summary: In this study, BaMnO3 was used as an additive to improve the drawbacks of MgH2, resulting in a lower desorption temperature, faster absorption kinetics, and lower activation energy. The formation of certain compounds enhanced the performance of MgH2.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Ewa Ostrowska-Ligeza, Karolina Dolatowska-Zebrowska, Rita Brzezinska, Magdalena Wirkowska-Wojdyla, Joanna Brys, Iga Piasecka, Agata Gorska
Summary: This study explored the thermal properties of ruby chocolate, which had been rarely studied in prior literature. Gas chromatography was used to determine the fatty acid composition of ruby chocolate fat. Differential scanning calorimetry (DSC) successfully determined the melting behavior and polymorphic forms of cocoa fat and milk fat in ruby chocolate. Pressurized differential scanning calorimetry (PDSC) was used to investigate the oxidative stability of the fat extracted from ruby chocolate. Thermogravimetry (TGA) was employed to study the thermal behavior of the chocolate and the fat. The results showed the thermal profile and characteristics of ruby chocolate in comparison to dark and milk chocolate. The melting temperature of ruby chocolate was found to be more similar to milk chocolate than dark chocolate. Regression analysis of PDSC data for the fat extracted from ruby chocolate exhibited a high correlation coefficient (>0.99). It was observed that there was no statistically significant difference in the activation energy (E-a) values for the oxidation process of the fat extracted from ruby chocolate obtained through maximum temperature (dynamic mode) and maximum induction time (isothermal mode).
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Environmental
Geo Jong Kim, Hyun Tae Hwang
Summary: Hydrogen from sodium borohydride can be generated by thermolysis or hydrolysis, but both methods have drawbacks such as high temperatures required or safety concerns. A new process, thermal hydrolysis of SBH, is proposed to address these issues and achieve efficient hydrogen production.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Kilsu Park, Myoung-jin Kim, Soon-mo Kwon, Shinuang Kang, Taegyu Kim
Summary: A solid NaBH4-based hydrogen generator was developed with a new reactor structure to meet the performance requirement for commercialization. The hydrogen generation was stable under various environmental conditions and different power modes, and the generator exhibited good start-up performance and precise controllability of the hydrogen supply rate.
Review
Engineering, Chemical
Zhen Chen, Zhongliang Ma, Jie Zheng, Xingguo Li, Etsuo Akiba, Hai-Wen Li
Summary: Hydrogen is considered a clean energy carrier that can be stored in gas, liquid, and solid states, with solid-state hydrides providing a more compact and safer storage option. This review provides an overview of material groups capable of reversible hydrogen absorption and desorption, summarizing their storage properties and discussing key issues and materials design guidance for new material development and industrial applications.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Biochemistry & Molecular Biology
Ou Jin, Yuanyuan Shang, Xiaohui Huang, Dorothee Vinga Szabo, Thi Thu Le, Stefan Wagner, Thomas Klassen, Christian Kuebel, Claudio Pistidda, Astrid Pundt
Summary: The addition of 3TiCl(3)center dot AlCl3 is found to improve the dehydrogenation kinetics of the reactive hydride composite LiBH4-MgH2. The growth process of MgB2 is studied, and it is observed that MgB2 prefers to form on TiB2 nanoparticles due to the creation of an interface that reduces the elastic strain energy density. The kinetics of MgB2 growth is described by the JMAK equation, and it is suggested that the nucleation center change from Mg to TiB2 leads to a transition from interface- to diffusion-controlled growth, resulting in a change in MgB2 morphology.
Article
Pharmacology & Pharmacy
Thamer Alzoubi, Gary P. Martin, David J. Barlow, Paul G. Royall
Summary: The study demonstrates that heating of lactose powders results in reversible epimerization associated with dehydration. This process follows zero-order kinetics and no additional chemical degradation was detected.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2021)
Article
Nanoscience & Nanotechnology
Liang Dan, Hui Wang, Xiaobao Yang, Jiangwen Liu, Liuzhang Ouyang, Min Zhu
Summary: This study demonstrates the significant improvement of hydrogen sorption performances of MgH2 by synthesizing Nb-doped TiO2 solid-solution-type catalysts. The catalyzed MgH2 is able to absorb 5% of H2 at room temperature for 20 seconds, release 6% of H2 at 225 degrees C within 12 minutes, and achieve complete dehydrogenation at 150 degrees C under a dynamic vacuum atmosphere. The success of solid solution-type catalysts in MgH2 provides a demonstration and inspiration for the development of high-performance catalysts and solid-state hydrogen storage materials.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
N. N. Sulaiman, M. Ismail, A. H. A. Rashid, N. A. Ali, N. A. Sazelee, S. N. Timmiati
Summary: The hydrogen sorption performances of the 4MgH(2) + LiAlH4 system destabilized with 5 wt% Al2TiO5 showed significantly improved dehydrogenation temperature and kinetics. The introduction of Al2TiO5 resulted in earlier hydrogen liberation and enhanced absorption and desorption kinetics, indicating a synergistic effect on hydrogen storage behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Haiguang Gao, Yingyan Zhao, Xu Zhang, Baozhou Zhao, Zhen Jia, Yana Liu, Xiaohui Hu, Yunfeng Zhu
Summary: This study introduces solid-solution MAX phase TiVAlC catalyst directly into the MgH2 system to improve its hydrogen storage performance. The excellent catalytic activity of TiVAlC catalyst can be explained by abundant electron transfer at external and internal interfaces. The influence of impurity phase on the overall activity of catalysts has also been studied, providing a unique method for designing composite catalyst to improve hydrogen storage performance of MgH2.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Review
Energy & Fuels
Erika Michela Dematteis, Jussara Barale, Marta Corno, Alessandro Sciullo, Marcello Baricco, Paola Rizzi
Summary: This paper discusses the technical and social aspects of using solid-state carriers for hydrogen storage. From a technical perspective, the classification and properties of carriers for solid-state hydrogen storage are reviewed, emphasizing the thermodynamics of the hydrogen sorption reaction. On the social side, the importance of considering social factors in technological innovation diffusion and the impact of gender perspectives on hydrogen-related energy storage systems are highlighted.
Article
Thermodynamics
Sunku Prasad, P. Muthukumar
Summary: This study conducted experiments on an annular porous metal hydride reactor equipped with radial fins. The absorption and desorption characteristics were studied under different pressure and temperature conditions. The energy efficiency of the developed hydrogen storage device was evaluated, and the effect of pre-sensible heating on desorption performance was analyzed. The results showed that the developed system had an energy efficiency of 76.76% and La0.7Ce0.1Ca0.3Ni5 exhibited higher storage capacity.
APPLIED THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
Taejun Ha, Young Whan Cho, Sang-In Lee, Jin-Yoo Suh, Joonho Lee, Jae-Hyeok Shim, Young-Su Lee
Summary: The hydrogen sorption properties of Ti4M2Oy compounds were studied to evaluate their potential as room-temperature hydrogen storage materials. The results indicated that Ti4Ni2O was a better candidate for room-temperature hydrogen storage. Partial substitutions of Fe, Co, and Cu for Ni did not improve the usable capacity, but they allowed for precise control of the equilibrium hydrogen pressure through composition changes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Min-Gu Jo, Jin-Yoo Suh, Myung-Yeon Kim, Han-Jin Kim, Woo-Sang Jung, Dong-Ik Kim, Heung Nam Han
Summary: The high temperature tensile and creep properties of FCC high-entropy alloys CrMnFeCoNi and CrFeCoNi were evaluated. It was found that there was no remarkable difference in the tensile behavior between the two alloys, but the creep rupture life of the CrFeCoNi alloy was significantly longer. This could be attributed to the enhanced solid solution strengthening and stronger grain boundary of the CrFeCoNi alloy, which led to the reduced formation of deleterious sigma phase.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Han-Jin Kim, Min-Kyung Cho, Gyeungho Kim, Seung-Yong Lee, Min-Gu Jo, Hayoung Kim, Jin-Yoo Suh, Joonho Lee
Summary: This study quantitatively evaluated the hydrogen-induced variation of stacking fault energy (SFE) of a CrMnFeCoNi high-entropy alloy (HEA) using transmission electron microscopy (TEM) with weak-beam dark-field (WBDF) technique. It was observed that the width of Shockley partial dislocations increased after hydrogen absorption, indicating a decrease in SFE of the alloy. This is the first direct observation of stacking faults under the influence of hydrogen in a face-centered cubic metallic structure.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Metallurgy & Metallurgical Engineering
Dong-Jun Choi, Tae-Yeong Kim, Hyun-Uk Hong, Joonoh Moon, Chang-Hoon Lee, Dong-Ik Kim, Jae-Hyeok Shim, Heung Nam Han, Young-Su Lee
Summary: The effects of Ti on the yield strength of low-Mo fire-resistant steels at high temperatures are investigated. Nanoscale TiC precipitates are found to be the major factor for the enhanced strength at room temperature. The amount of TiC precipitates and both the yield and tensile strengths increase with the Ti content. However, the steel with the highest Ti content shows a significantly reduced yield strength ratio at 600 degrees C.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Jeong Min Kim, Taejun Ha, Joonho Lee, Young-Su Lee, Jae-Hyeok Shim
Summary: This study predicts the PCT curves for hydrogen absorption and desorption of AB(2)-type hydrogen storage alloys at arbitrary temperatures using three machine learning models. By improving the PCT curve function and generating unmeasured temperature data, the prediction accuracy is greatly improved, with the DNN model performing the best.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Hayoung Kim, ShinYoung Kang, Ji Yeong Lee, Tae Wook Heo, Brandon C. Wood, Jae-Hyeok Shim, Young Whan Cho, Do Hyang Kim, Jin-Yoo Suh, Young -Su Lee
Summary: This study evaluates the effect of alloying elements on the initial hydrogenation kinetics of TiFe alloys through analyzing the changes in TiFe0.9M0.1 (M = V, Cr, Fe, Co, and Ni) alloys. The results reveal suppressed oxide growth and reduced nucleation barrier in alloyed TiFe, leading to improved activation kinetics. These findings provide a starting point for alloy design strategies towards further improvement.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Pritam Das, Krishnamohan Thekkepat, Young-Su Lee, Seung-Cheol Lee, Satadeep Bhattacharjee
Summary: Finding a suitable material for hydrogen storage under ambient atmospheric conditions is challenging. In this study, the hydrogen storage capacity of Ti(2)AC MAX phase and its alloys were investigated using a first principles based cluster expansion approach. It was found that hydrogen adsorption is energetically more favorable on the tetrahedral site in the Ti-A layer. Ti2CuC has the highest hydrogen adsorption energy and a Cu-doped Ti2AlxCu1-xC alloy structure can store 3.66 wt% hydrogen under ambient atmospheric conditions, surpassing Ti2AlC and Ti2CuC phases.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Yong-Jin Jang, Hyungeun Seo, Young-Su Lee, Sora Kang, Woosuk Cho, Young Whan Cho, Jae-Hun Kim
Summary: This study prepared solid electrolytes containing BH4- anions via a simple and fast method, showcasing high ionic conductivity. By investigating the local structure of lithium thiophosphate, it was found that the ionic conductivity can be influenced by changing the amount of LiBH4 and milling conditions.
Article
Nanoscience & Nanotechnology
Dae Cheol Yang, Sang Yoon Song, Han-Jin Kim, Sang-In Lee, Biswanath Dutta, Young Kyun Kim, Jae-Hyeok Shim, Jin-Yoo Suh, Young Sang Na, Seok Su Sohn
Summary: The issue of hydrogen embrittlement (HE) is significant for storing and transporting hydrogen, but there is limited understanding of how the unique properties of multi-principal element alloys affect HE mechanisms. In this study, the reduction rate of ductility by hydrogen uptake was measured for VCrCoNi alloys with analogous grain sizes. The results showed that the alloy with an intermediate ratio of V and Cr exhibited the highest resistance to HE due to its favorable grain boundary characteristics, including large fractions of special boundaries and special triple junctions, and large twin-related domain size.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Tae Jin Jang, You Na Lee, Yuji Ikeda, Fritz Koermann, Ju-Hyun Baek, Hyeon-Seok Do, Yeon Taek Choi, Hojun Gwon, Jin-Yoo Suh, Hyoung Seop Kim, Byeong-Joo Lee, Alireza Zargaran, Seok Su Sohn
Summary: Complex concentrated alloys (CCAs) with a face-centered-cubic (FCC) structure can improve both strength and ductility by adding the refractory element Mo to the alloy, resulting in enhanced solid-solution strengthening and reduced stacking fault energy (SFE).
Article
Chemistry, Physical
Taejun Ha, Vivek Shukla, Taewook Na, Young Whan Cho, Jin-Yoo Suh, Jae-Hyeok Shim, Young -Su Lee
Summary: This study reports the development of a two-stage metal hydride hydrogen compressor capable of compressing hydrogen from 1 to 30 MPa through a temperature change. The selected alloys were successfully used in a laboratory-scale compressor, and the compression capacity was analyzed to estimate the usable capacity of the materials. The results of this study can guide the design and evaluation of multistage MHHCs.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Taejun Ha, June-Hyung Kim, Changhyo Sun, Dong-Ik Kim, Jin-Yoo Suh, Jae-il Jang, Joonho Lee, Yunseok Kim, Jae-Hyeok Shim
Summary: The effect of Ce addition on the initial hydrogen absorption behavior and microstructural features of AB-type Ti50Fe48V2 hydrogen storage alloys was investigated. Ce addition significantly improved the initial hydrogen absorption kinetics at room temperature, with no significant influence on the pressure-composition isotherms. Fine spherical particles containing Ce were dispersed in the TiFe matrix, and these particles were determined to be gamma-Ce mixed with cerium oxide. Ce particles played a crucial role by providing starting points for initial hydrogenation, explaining the significant increase in primary hydrogen absorption kinetics after Ce addition.
Article
Materials Science, Multidisciplinary
Tae Jin Jang, Ju-Hyun Baek, Jin-Yoo Suh, Alireza Zargaran, Seok Su Sohn
Summary: The pursuit of a superior combination of strength and ductility in metallic materials for structural applications has long been a challenge. Recently, L12 (g') precipitation-strengthened high-entropy alloys (HEAs) that undergo direct aging from cold-rolled states have exhibited exceptional strength-ductility synergy. However, the origins of this synergetic effect in direct aging are still a subject of controversy. Herein, we aim to unravel the fundamental factors contributing to the improved mechanical properties of directly aged HEAs.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Electrochemistry
Lasse N. Skov, Jakob B. Grinderslev, Asger Rosenkranz, Young-Su Lee, Torben R. Jensen
Summary: Solid-state inorganic magnesium batteries are considered as potential high energy storage devices of the future. In this study, magnesium borohydride tetrahydrofuran (THF) composites were used as solid-state electrolytes for magnesium batteries, and several compounds with high ionic conductivity were identified. A proof-of-concept rechargeable solid-state magnesium battery was assembled, showing stability and high discharge capacity.
BATTERIES & SUPERCAPS
(2022)
Review
Energy & Fuels
Erika Michela Dematteis, Mads B. Amdisen, Tom Autrey, Jussara Barale, Mark E. Bowden, Craig E. Buckley, Young Whan Cho, Stefano Deledda, Martin Dornheim, Petra de Jongh, Jakob B. Grinderslev, Goekhan Gizer, Valerio Gulino, Bjorn C. Hauback, Michael Heere, Tae Wook Heo, Terry D. Humphries, Torben R. Jensen, Shin Young Kang, Young-Su Lee, Hai-Wen Li, Sichi Li, Kasper T. Moller, Peter Ngene, Shin-ichi Orimo, Mark Paskevicius, Marek Polanski, Shigeyuki Takagi, Liwen Wan, Brandon C. Wood, Michael Hirscher, Marcello Baricco
Summary: This review paper provides an overview of the intense literature and research efforts on complex hydrides for energy storage applications. It focuses on recent advances in different complex hydride systems from the collaborative activities of research groups led by experts of the Task 40 'Energy Storage and Conversion Based on Hydrogen' of the International Energy Agency. The paper reviews materials design, synthesis, tailoring, modelling approaches, hydrogen release and uptake mechanisms, and thermodynamic aspects to define new trends and suggest new possible applications for these highly tuneable materials.
PROGRESS IN ENERGY
(2022)