Article
Chemistry, Physical
Peng Wang, Zhihui Tian, Zexuan Wang, Chaoqun Xia, Tai Yang, Xiulong Ou
Summary: In this study, transition metal sulfides were used as catalysts to enhance the hydrogen storage behaviors of MgH2. The addition of sulfides significantly increased the desorption and absorption kinetics of hydrogen in MgH2, with MgH2-TiS2 showing the best performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Cong Peng, Qingan Zhang
Summary: In this study, a high-efficient catalyst comprising of YCxFy nanosheets-supported Ni nanoparticles was designed to address the sluggish kinetics and poor cyclic stability of MgH2. The as-achieved MgH2-10 wt.% Ni-30/YCxFy composite exhibits superior hydrogen desorption kinetics and high capacity retention. The in situ formed Mg2NiH4 and YH3 catalytic phases accelerate the hydrogen desorption kinetics, while the dispersed MgF2 and carbon species prevent the crystallite growth, particle aggregation, and catalyst redispersion, contributing to an excellent cyclic stability.
Article
Metallurgy & Metallurgical Engineering
Yaokun Fu, Lu Zhang, Yuan Li, Sanyang Guo, Han Yu, Wenfeng Wang, Kailiang Ren, Wei Zhang, Shumin Han
Summary: Hydrogen storage is a crucial aspect of the hydrogen economy, and solid-state hydrogen storage is the most promising approach. In this study, a ternary transition metal sulfide FeNi2S4 with a hollow balloon structure was designed as a catalyst for MgH2 to enhance its dehydrogenation/hydrogenation performance by constructing a MgH2/Mg2NiH4-MgS/Fe system.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
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
Energy & Fuels
Zhichao Yu, Xin Liu, Yang Liu, Yuan Li, Zhuohan Zhang, Kangli Chen, Shumin Han
Summary: The hydrogen absorption/desorption kinetics of MgH2 can be significantly improved by using Ni@C@CeO2 as the catalyst. The composites, with 10 wt% Ni@C@CeO2 doped, can absorb 4.51 wt% hydrogen within 60 min at 75 degrees C and release approximately 4.88 wt% hydrogen within 10 min at 325 degrees C. In addition, the composites show excellent cycling performance with no decrease in hydrogen storage capacity, hydrogen uptake rate, and hydrogen release rate after ten cycles at 350 degrees C. The in-situ formation of Mg2NiH4/Mg2Ni and CeH2.73 phases enhances the hydrogen pump effect and accelerates the conversion of Mg2Ni/Mg2NiH4, which contributes to the improved hydrogen storage performance of MgH2.
Article
Engineering, Environmental
Yaokun Fu, Zhichao Yu, Sanyang Guo, Yuan Li, Qiuming Peng, Lu Zhang, Shikui Wu, Shumin Han
Summary: Catalyst doping modification is an effective strategy to address the challenges of high desorption temperature and sluggish kinetics in MgH2, enabling its potential commercial application.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Zhihui Tian, Zexuan Wang, Pufan Yao, Chaoqun Xia, Tai Yang, Qiang Li
Summary: In this study, transitional metal carbides were used to enhance the hydrogen storage behaviors of magnesium-based materials, with Ti3C2 showing the best catalytic effect on the dehydrogenation kinetic properties of MgH2. The introduction of these carbides improved the hydrogen absorption and desorption kinetics of MgH2.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Review
Materials Science, Multidisciplinary
Hang Yang, Zhao Ding, Yu-Ting Li, Shao-Yuan Li, Ping-Keng Wu, Quan-Hui Hou, Yang Zheng, Biao Gao, Kai-Fu Huo, Wen-Jia Du, Leon L. Shaw
Summary: Developing safer and more efficient hydrogen storage technology is crucial for the realization of the hydrogen economy. MgH2 has been extensively studied as a promising solid-state hydrogen storage material due to its lightweight, high storage density, and abundant reserves. However, practical applications have been hindered by issues such as stable thermodynamics, sluggish kinetics, and rapid capacity decay.
Article
Chemistry, Physical
Jiaao Wu, Haohua Zhang, Yitong Wang, Yongjin Zou, Bin Li, Cuili Xiang, Lixian Sun, Feng Xu, Ting Yu
Summary: MgH2 is considered as a highly advantageous hydrogen storage material due to its safety, high efficiency, significant hydrogen storage capacity, and low cost. However, its application is limited by subpar thermodynamics and kinetics, which can be enhanced through combination with other materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(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
Chaodong Hu, Zhiwen Zheng, Tingzhi Si, Qingan Zhang
Summary: The amorphous TiMgVNi3-doped MgH2, prepared by ball milling under a hydrogen atmosphere, exhibits enhanced dehydrogenation kinetics and cycle durability due to the in situ formation of catalytic nanoparticles from an amorphous phase.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Materials Science, Multidisciplinary
Yaxiong Yang, Xin Zhang, Lingchao Zhang, Wenxuan Zhang, Huifeng Liu, Zhenguo Huang, Limei Yang, Changdong Gu, Wenping Sun, Mingxia Gao, Yongfeng Liu, Hongge Pan
Summary: The storage of hydrogen in a compact, safe and cost-effective manner is crucial for a more sustainable society. Magnesium hydride (MgH2) has attracted attention as a hydrogen carrier but its practical use is limited due to high temperatures and slow kinetics. Catalysis plays a crucial role in enhancing hydrogen cycling kinetics, and research has focused on designing and optimizing catalysts for Mg/MgH2.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Xiaoyue Zhang, Yahui Sun, Shunlong Ju, Jikai Ye, Xuechun Hu, Wei Chen, Long Yao, Guanglin Xia, Fang Fang, Dalin Sun, Xuebin Yu
Summary: This paper demonstrates a concept of solar-driven reversible hydrogen storage of metal hydrides by utilizing the photothermal effect and catalytic role. The photothermal effect of Cu@MXene raises the temperature of the hydrogen storage material, while the hydrogen pump effect of Ti and TiHx species formed on the surface of MXene reduces the operating temperature, achieving efficient hydrogen storage.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yaokun Fu, Lu Zhang, Yuan Li, Sanyang Guo, Zhichao Yu, Wenfeng Wang, Kailiang Ren, Qiuming Peng, Shumin Han
Summary: In this study, a carbon-supported transition metal compound, FeCoS@C derivative, was synthesized as a heterogeneous catalyst for MgH2. The results showed that the catalyst significantly improved the hydrogen storage performance of MgH2 by increasing the hydrogen absorption rate and reducing the dehydrogenation temperature. The transition metals and MgS played important roles in accelerating hydrogen transfer and providing stable catalytic effect. Additionally, the carbon skeleton provided more active sites for the catalysts, further enhancing the catalytic performance.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Jyoti Yadav, M. D. Anoop, Rini Singh, Nisha Yadav, N. Srinivasa Rao, Fouran Singh, Ankur Jain, Takayuki Ichikawa, Kamlendra Awasthi, Manoj Kumar
Summary: In this study, precise and controlled tuning of strain in BiSbTe3 thin films was achieved by Fe ion implantation. The influence of Fe ions on the electronic band structure of BiSbTe3 and the tunability of Fermi level were confirmed by changes in resistivity. The observed reversible tuning of the Fermi level suggests potential device control applications.
Article
Chemistry, Physical
Kentaro Tagawa, Hiroyuki Gi, Keita Shinzato, Hiroki Miyaoka, Takayuki Ichikawa
Summary: This study investigates the reaction properties of ammonia synthesis via the chemical looping process of lithium hydride and proposes a kinetic improvement. The use of lithium oxide as a scaffold significantly improves the reaction kinetics by suppressing product agglomeration. The reaction between lithium hydride and nitrogen can be completed in just 20 minutes with the addition of lithium oxide, compared to more than 1000 minutes without it. Ammonia can be generated at ambient pressure through successive reactions of lithium hydride with nitrogen and hydrogen, which are exothermic processes. The kinetics of the reactions can be controlled by using scaffolds.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Keita Shinzato, Yuki Nakagawa, Subing Yang, Shigehito Isobe, Tamaki Shibayama, Hiroki Miyaoka, Takayuki Ichikawa
Summary: In this study, hexagonal boron nitride (h-BN) was used for the surface modification of titanium (Ti) to achieve high reactivity for hydrogen (H-2) absorption. The Ti modified by h-BN could absorb approximately 3 wt % of H-2 at 40 degrees C within 10 min and the functional surface was maintained even after dehydrogenation at high temperatures.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Yoshitsugu Kojima, Masakuni Yamaguchi
Summary: The gravimetric H-2 densities and heats of combustion of ammonia storage tanks were similar to those of liquid H-2 tanks, while the volumetric H-2 densities and heats of combustion were higher. Gray, blue, and green ammonia have different production processes and energy efficiencies, with green ammonia having the lowest production cost.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Keita Shinzato, Kentaro Tagawa, Koki Tsunematsu, Hiroyuki Gi, Pankaj Kumar Singh, Takayuki Ichikawa, Hiroki Miyaoka
Summary: The pseudo-catalytic properties of lithium-based alloys with group 14 elements were investigated for ammonia synthesis. The reaction temperature and the formation of products depend on the composition of the alloy, and the metallic feature of lithium species plays a significant role in the reaction. Furthermore, ammonia synthesis can also be achieved at lower temperatures through a catalytic process using a mixture of hydrogen and nitrogen.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Masakuni Yamaguchi, Yoshitsugu Kojima, Hiroki Miyaoka
Summary: Zirconium phosphate is a material capable of adsorbing and regenerating ammonia, and can be repeatedly used at high temperatures.
Article
Chemistry, Physical
Hiroyuki Gi, Yuki Kashiwara, Yuki Itoh, Khushbu Sharma, Norio Ogita, Hiroki Miyaoka, Tomofumi Ogawa, Marolop Simanullang, Laurent Prost, Takayuki Ichikawa
Summary: A systematic study was conducted on the cryogenic H2 adsorption properties below the critical point of H2 on various adsorbents, comparing the density of adsorbed H2 and its temperature dependence with liquid H2. While most studies focus on new porous materials for H2 storage, this study investigated the density of adsorbed H2 below the critical point for metal-organic frameworks, super-activated carbon, and graphene nanoplatelets. It was found that the adsorption of superdense H2 in a monolayer state had a much higher density than liquid H2.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Electrical & Electronic
Jyoti Yadav, M. D. Anoop, Nisha Yadav, N. Srinivasa Rao, Fouran Singh, Takayuki Ichikawa, Ankur Jain, Kamlendra Awasthi, Rini Singh, Manoj Kumar
Summary: The effects of Ni7+ ion irradiation on Bi2Te3 thin films synthesized by e-beam evaporation were investigated. The films exhibited a polycrystalline rhombohedral structure. Irradiation caused a decrease in crystallite size and an increase in lattice strain. Raman spectra showed changes in A(1u)(1) modes with ion fluence. Surface roughness decreased due to the formation of nanocrystallites. XPS analysis confirmed the near stoichiometric composition of the films. The resistivity increased with ion fluence, resulting in a crossover behavior from n to p-type carriers. Compensation of bulk charge carriers was observed in the ion-irradiated films by adjusting the Fermi level.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Masakuni Yamaguchi, Tomoyuki Ichikawa, Yoshitsugu Kojima, Hiroki Miyaoka
Summary: In this study, the equilibrium pressure of zirconium phosphate during ammonia ab/desorption was measured using cavity ring-down spectroscopy (CRDS). Two-step equilibrium plateau pressure was observed during the ammonia desorption. Hysteresis in zirconium phosphate at different equilibrium pressures during ammonia desorption and absorption was also observed.
Article
Chemistry, Physical
Pankaj Kumar Singh, Keita Shinzato, Hiroyuki Gi, Takayuki Ichikawa, Hiroki Miyaoka
Summary: This study systematically investigates the catalytic properties of group 4-6 element oxides, including TiO2, ZrO2, HfO2, V2O5, Ta2O5, CrO3, MoO3, and WO3, on magnesium hydride (MgH2). The dispersion of each oxide on the MgH2 surface is achieved through ball-milling. The hydrogen desorption properties are analyzed, and the oxides on MgH2 are characterized structurally and spectroscopically. Among the oxides, TiO2, V2O5, ZrO2, and CrO3 exhibit higher catalytic activity, enabling hydrogen desorption at around 200°C. The dispersion of the oxides on Mg is found to be closely related to the catalytic process, except for MoO3. Multi oxide states, particularly the 2+ and 3+ oxidation states of transition metals, contribute to the high catalytic activity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Yingtong Lv, Xiang Zhang, Wei Chen, Shunlong Ju, Zhenhua Liu, Guanglin Xia, Takayuki Ichikawa, Tengfei Zhang, Xuebin Yu
Summary: Nano-crystallization of MgH2 as an anode in all-solid-state lithium-ion batteries (ASSLIBs) using LiBH4 as a solid-state electrolyte is applied to improve cycling stability. The self-assembly designed MgH2 electrode on graphene effectively alleviates volume expansion, prevents agglomeration of active substances, improves electron transfer, and enhances electrochemical performance. The study demonstrates reversible capacity of 1214 mAh g-1 after 50 cycles and significantly enhanced cycle life with a capacity of 597 mAh g-1 after 200 cycles at a current density of 400 mA g-1. Full cell investigation also shows great application potential for ASSLIBs.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Masakuni Yamaguchi, Yoshitsugu Kojima, Hiroki Miyaoka
Summary: This study investigates the regeneration process of ammonia-absorbed zirconium phosphate and finds that it can be regenerated at 473K by reabsorbing ammonia and water, allowing for repeated use.
Article
Materials Science, Multidisciplinary
Nisha Yadav, M. D. Anoop, Jyoti Yadav, Rini Singh, Nabarun Bera, Sandeep Ravaji Patel, Ankur Jain, Takayuki Ichikawa, Fouran Singh, Kamlendra Awasthi, Manoj Kumar
Summary: Invoking defects with ion implantation is an attractive method to modify the physical parameters of materials. This study used Cu ion implantation to modify the lattice parameter and resistivity of BiSbTe3 single crystals. The results showed that Cu ion implantation reduced the lattice parameter and decreased the strain, leading to a decrease in resistivity and an enhancement of the metallic nature of the sample. The Hall coefficient indicated that holes were the dominating charge carriers.
BULLETIN OF MATERIALS SCIENCE
(2022)
Article
Electrochemistry
Kishore Singh, Yuchen Yao, Takayuki Ichikawa, Ankur Jain, Rini Singh
Summary: Electrochemical energy storage is an important solution to meet the intermittent renewable energy production. All-solid-state batteries, with zinc electrodes as a promising material, offer high gravimetric capacity and stability. The experimental results demonstrate that zinc electrodes in two different solid-state electrolytes show high volumetric density and coulombic efficiency, making them a potential choice for future all-solid-state Li-ion batteries.
Article
Chemistry, Multidisciplinary
Yoshitsugu Kojima, Masakuni Yamaguchi, Haruo Sawa, Katsuhide Kikuchi, Noriyuki Hiramitsu, Masahiko Kimbara, Haruyuki Nakanishi, Yasuhiro Takahashi
Summary: The capacitances of porous carbon anodes were determined using a Ni(OH)(2) cathode. The capacitances were found to be 300-700 F g(-1), which is over 3 times higher than those of carbon anodes prepared by electrical double layer formation, indicating the larger capacitances achieved through protium H adsorption in the presence of highly concentrated KOH solution.
CHEMICAL COMMUNICATIONS
(2022)
