Article
Materials Science, Multidisciplinary
Can Li, Zhi-Wen Wu, Qing-An Zhang
Summary: Mg2FeH6 and Mg2CoH5 composites with in situ formed YH3 and Mg2NiH4 nanoparticles were synthesized. The nanocrystalline YH3 and Mg2NiH4 particles are embedded in the matrixes of Mg2FeH6 and Mg2CoH5, respectively. The hydrogen desorption rates of the composites are enhanced due to the synergetic catalysis of nanosized YH3 and Mg2NiH4 particles.
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, Physical
F. J. Antiqueira, D. R. Leiva, G. Zepon, W. J. Botta
Summary: In recent studies, it was found that high energy ball milling of Mg/MgH2 mixed with additives can reduce the temperature for H-2 absorption/desorption without altering thermodynamic properties. This research aimed to identify efficient hydrogen absorption/desorption catalysts at low temperatures, particularly at room temperature (RT). Among the additives tested in this study, MgH2-TiFe mixture showed the best performance, attributed to the strong catalytic action of TiFe and the high energy interfaces attracting hydrogen gas.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Zaifa Wang, Baiyu Guo, Jitong Yan, Ziqi Zhang, Yong Su, Yongfu Tang, Liqiang Zhang, Lingyun Zhu, Jianyu Huang
Summary: The electrochemistry of the Li-SeS2 battery was revealed in this study, showing phase-separated Se and S as charge products. Among the various SexSy cathodes, SeS2 exhibited the best electrochemical performance. The Li-SeS2 all-solid-state battery demonstrated high reversible capacity and areal capacity, bringing us closer to practical applications.
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
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
Chemistry, Physical
Shixuan He, Guangxu Li, Ye Wang, Liu Liu, Zhaoqiu Lu, Li Xu, Peng Sheng, Xinhua Wang, Haiqiang Chen, Cunke Huang, Zhiqiang Lan, Wenzheng Zhou, Jin Guo, Haizhen Liu
Summary: TiB2 was introduced by ball milling to improve the decomposition performance of AlH3, forming Al-Ti-B solid solution through reaction. The AlH3 + 2.5 wt% TiB2 ball milled at 225 rpm for 108 min showed the best decomposition performance, starting decomposition at 78°C and stopping at 130°C with 8.5 wt% hydrogen released. This study provides an efficient strategy to achieve high hydrogen capacity and low decomposition temperature of metastable AlH3 through proper ball milling with metal borides.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(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
Chemistry, Physical
Agata Baran, Michal Kniola, Tomasz Rogala, Marek Polanski
Summary: A new route of materials synthesis, high-temperature, high-pressure reactive planetary ball milling (HTPRM), is introduced in this study. It allows for the controlled mechanosynthesis of materials at temperatures up to 450 degrees C and pressures up to 100 bar of hydrogen. The successful synthesis of magnesium hydride is presented as an example of the application, demonstrating the great potential of this technique for the mechanochemical synthesis of materials.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Farai Michael Nyahuma, Liuting Zhang, Mengchen Song, Xiong Lu, Beibei Xiao, Jiaguang Zheng, Fuying Wu
Summary: This study investigates the excellent modification effect of Nb nanocatalyst prepared via surfactant assisted ball milling technique on the hydrogen storage properties of MgH2. The results show that the MgH2-5wt%Nb composite exhibits improved hydrogen storage performance, with a lower hydrogen release/absorption temperature and higher cycling stability.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Thermodynamics
J. T. Gao, Z. Y. Xu, R. Z. Wang
Summary: A prediction framework was established to investigate promising IL absorbents in thermal storage/transmission, revealing an optimal region with high COP and energy density. The study suggests that there is a potential 57% increase in energy density by optimizing the affinity between species and decreasing excess enthalpy during generation. This theoretical framework could be extended to fluid design and screening in absorption thermal energy storage/transmission and related technologies.
ENERGY CONVERSION AND MANAGEMENT
(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
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)
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)
Review
Chemistry, Applied
Haizhen Liu, Longfei Zhang, Hongyu Ma, Chenglin Lu, Hui Luo, Xinhua Wang, Xiantun Huang, Zhiqiang Lan, Jin Guo
Summary: Aluminum hydride (AlH3) is a promising hydrogen storage material with high hydrogen density and low desorption temperature. Research focuses on the structures, synthesis, decomposition characteristics, and application validation of AlH3.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Chemistry, Physical
Julien O. Fadonougbo, Han-Jin Kim, Byeong-Chan Suh, Chang Dong Yim, Tae-Wook Na, Hyung-Ki Park, Jin-Yoo Suh
Summary: In this study, the cyclic performance, microstructure, and thermal properties of near eutectic Mg-Ni alloys with different Ni contents were investigated. The alloys showed excellent stability under cyclic service and low decomposition temperature, making them suitable for long-term hydrogen and heat storage applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Ki Beom Park, Jae-Young Park, Young Do Kim, Julien O. Fadonougbo, Seongtak Kim, Hyo-Kyu Kim, Jang-Won Kang, Hyun-Su Kang, Hyung-Ki Park
Summary: This study investigated the microstructures, hydrogen absorption kinetics, and surface oxides of a Ti0.2Zr0.2Nb0.2V0.2Cr0.17Fe0.03 high entropy alloy (HEA). The presence of high chromium concentration in the oxide layer on the FCC phase ingot significantly increased its reactivity with hydrogen, while the BCC phase ingot did not react with hydrogen, possibly due to the absence of chromium in its oxide layer.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Jae-Young Park, Kwangsuk Park, Bosung Seo, Julien O. Fadonougbo, Tae-Wook Na, Ki Beom Park, Hyeon-Tae Im, Nong-Moon Hwang, Hyung-Ki Park
Summary: This study investigated the insulation coating technology of Fe-Si-Cr powder through selective oxidation annealing, achieving selective oxidation of elements by controlling oxidation potential. The results showed that the powder treated with selective oxidation annealing had significantly improved insulation properties with a complex oxide layer of Si and Cr formed on the surface. Furthermore, analyzing the saturation magnetic flux density indicated that the powder treated with selective oxidation annealing had only a slightly reduced flux density compared to that of the initial powder annealed in an air atmosphere.
METALS AND MATERIALS INTERNATIONAL
(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
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)
