Article
Chemistry, Physical
Miao Miao Li, Chang Chun Wang, Chun Cheng Yang
Summary: A series of Co-free hydrogen storage alloys have been designed and fabricated, with La0.95Y0.05Ni4.5Mn0.4Al0.35 showing superior electrochemical kinetics and low-temperature discharge performance. This Co-free alloy electrode exhibits significantly higher discharge specific capacity compared to a commercial alloy electrode at high discharge current density, and maintains remarkable performance advantages at low temperatures.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Shujuan Zhou, Li Wang, Wei Xiong, Baoquan Li, Jin Li, Xu Zhang, Jin Xu, Yuyuan Zhao, Huizhong Yan
Summary: A new-type La1.9Y4.1Ni20.8Mn0.2Al H-2-storage alloy was prepared and annealed at 1148 K, showing improved electrochemical kinetics and high discharge performance in cold operating conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Environmental
Mingxing Wei, Yijin Liu, Xiaofei Xing, Zhao Zhang, Tong Liu
Summary: By introducing a specially designed and synthesized high-entropy alloy catalyst, the hydrogen storage properties of MgH2 have been significantly improved, resulting in faster absorption and desorption rates, lower activation energy, and high capacity retention.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Yu-Sheng Tseng, Ilizel Retita, John Andrews, Daniel Liang, S. L. I. Chan
Summary: Vanadium-based alloys that meet the working conditions of RAPS and MPS are tailor-made in this study. The effects of pulverization methods and particle sizes on the hydrogen storage properties are investigated. The results show that 5 mm hydrogen-embrittled V80Ti8Cr12 alloy exhibits the highest usable hydrogen storage capacity of 2.1 wt% and the fastest hydrogen desorption rate of approximately 4 sccm/g, making it an ideal hydrogen storage material for RAPS and MPS applications.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Song-Jeng Huang, Matoke Peter Mose
Summary: The impact of ball milling on the hydrogen storage capabilities of AZ61 magnesium alloys was investigated in this study, with a focus on understanding the underlying structure-property relationships. The structure of the AZ61 alloy was analyzed using x-ray diffraction, particle size, morphology, and Sievert's analysis. The results showed that ball milling changed the morphology and decreased the particle size of the powder samples, leading to an improvement in hydrogen storage performance.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Jingjing Liu, Jie Xu, Salma Sleiman, Francia Ravalison, Wei Zhu, Hongfei Liu, Honghui Cheng, Jacques Huot
Summary: This paper presents the synthesis, first hydrogenation kinetics, thermodynamics, and cycling effect on the hydrogen storage properties of a V0.3Ti0.3Cr0.25Mn0.1Nb0.05 high entropy alloy. The results show that the alloy has a high hydrogen storage capacity and reversible hydrogen desorption performance, but experiences capacity loss and changes in hydrogen absorption kinetics during cycling.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Xiangfeng Ma, Xin Ding, Ruirun Chen, Xiugang Chen, Qiang Song, Hongzhi Cui
Summary: This study investigates the microstructure and hydrogen storage properties of an equimolar TiVZrNbFe alloy. It is found that the alloy consists of C14 phase and Nb-based solid solution phase. Different hydride phases are formed after hydrogenation and dehydrogenation due to the difference in valence electron concentration. The alloy exhibits excellent hydrogen absorption capacity and the hydrogenation mechanism involves nucleation and growth of hydrides.
Article
Chemistry, Physical
Wenbin Jiang, Cheng Tan, Jianling Huang, Liuzhang Ouyang, Min Chen, De Min, CanHui Liao, RenHeng Tang, Min Zhu
Summary: A hyper-stoichiometric AB(5.09) alloy with Sm doping is designed to achieve high power performance in Ni-metal hydride batteries. The addition of Sm results in a decrease in maximum capacity and hydride stability, but an increase in cycling stability. The alloys exhibit good high-rate discharge performance due to the formation of the Ni2MnAl catalytic phase, with further improvements in high-rate dischargeability and specific power after Sm doping.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Physical
Fenghai Guo, Tiebang Zhang, Limin Shi, Yu Chen, Lin Song
Summary: In this study, a new type of Mg-based composites with a particle size of 800 nm was designed by doping hydrogenated Mg-Ni-La alloy with multi-walled carbon nanotubes (MWCNTs) and/or Co nanoparticles. The results demonstrated that the addition of MWCNTs and Co improved the hydrogen storage behaviors and accelerated the de-/hydriding kinetics. Dehydrogenation analyses revealed a significant decrease of dehydrogenation energy barriers with the addition of MWCNTs and Co.
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
Chemistry, Physical
Ki Beom Park, Tae-Wook Na, Young Do Kim, Jae-Young Park, Jang-Won Kang, Hyun-Su Kang, Kwangsuk Park, Hyung-Ki Park
Summary: The study investigated microstructures, hydrogen absorption kinetics, and oxide layers of TiFe and Ti1.2Fe hydrogen storage alloys. Compared to TiFe alloy, Ti1.2Fe alloy with three phases showed better hydrogen absorption performance. The concentration of Ti in the oxide layer was found to be crucial for improving hydrogen absorption kinetics.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Shuai Wang, Hui Yong, Jiwei Yao, Jiangwei Ma, Baosheng Liu, Jifan Hu, Yanghuan Zhang
Summary: The Mg90Ce5Y5 alloy was prepared by vacuum induction melting, and Mo, MoO2, and MoO3 were added to it through mechanical ball milling. The microstructure, phase evolution, hydrogen storage thermodynamics, and kinetics were studied using XRD, SEM, TEM, PCT, and DSC methods. The results showed that the internal phases of the Mo catalyzed alloy transformed into MgH2, CeH2.73, YH3, and Mo phases upon hydrogen absorption, while the hydrogenated alloy consisted of MgH2, CeO2, YH3, MgO, and Mo phases for the MoO2 catalyzed alloy, and MgH2, MgO, CeO2, Y2O3, and Mo phases for the MoO3 catalyzed alloy. REDOX reactions occurred between MoO2, MoO3, and the inner phase of the alloy. Compared to the others, the Mo catalyzed alloy exhibited a higher hydrogen absorption saturation ratio, and the MoO2 catalyzed alloy required less time to release H2 compared to the Mo and MoO3 catalyzed alloys. The dehydrogenation activation energy (Edes) of the samples showed an increasing trend in the order of MoO2 catalyzed alloy (110.18 kJ/mol).
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Pengcheng Li, Jutao Hu, Gang Huang, Jianwei Zhang, Weidu Wang, Chengxiang Tian, Haiyan Xiao, Xiaosong Zhou, Huahai Shen, Xinggui Long, Shuming Peng, Xiaotao Zu
Summary: This study investigates the electronic structure, activation, and kinetic properties of TiZrHfMoNb high-entropy alloy doped with active metals. The results demonstrate that electron transfer occurs between active metal atoms and other metal atoms, leading to the destabilization of the surface oxide and improved activation performance. It is believed that this electron transfer process optimizes the electron density of interstitial sites, allowing for increased hydrogen storage capacity. This research provides new insights into the hydrogen storage properties of high-entropy alloys and highlights the potential for further increasing the storage capacity through doping.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
H. Zhou, Z. Ding, Y. A. Chen, Z. Q. Lan, S. F. Guo, F. Spieckermann, V. Zadorozhnyy, J. Tan, F. S. Pan, J. Eckert
Summary: The hydrogen storage properties of amorphous and crystalline Mg85Ni5Y10 alloys were compared, and the melt-spun alloy showed higher storage capacity and faster kinetics than the induction-melted alloy. The reversible storage capacity of the melt-spun alloy was 4.2 wt% H2, while the induction-melted sample had 3.8 wt% at 200 degrees C. Furthermore, the melt-spun alloy could release 4.1 wt% H2 within 30 min at temperatures above 275 degrees C, close to its theoretical hydrogen storage capacity of 4.2 wt%.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Jiwei Yao, Hui Yong, Yang Zhao, Chengyan Sun, Xianliu Xu, Baosheng Liu, Dongliang Zhao, Jifan Hu, Yanghuan Zhang
Summary: The Mg90Ce5Y5 + x wt% ZnF2 (x = 3, 6, 10, 15) composites were prepared by mechanical ball-milling, and their effects on the hydrogen absorption and desorption properties of Mg90Ce5Y5 alloy were investigated. The addition of ZnF2 introduced MgF2 and MgZn2 phases, which acted as catalysts and improved the hydriding-dehydriding characteristics. Mg90Ce5Y5 + 6 wt% ZnF2 composites exhibited the fastest hydrogen adsorption/desorption kinetics and lower decomposition temperatures.
MATERIALS CHARACTERIZATION
(2023)